WO2013155982A1 - 一种负载型金属氧化物双活性中心乙烯聚合催化剂及其制备方法与应用 - Google Patents

一种负载型金属氧化物双活性中心乙烯聚合催化剂及其制备方法与应用 Download PDF

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WO2013155982A1
WO2013155982A1 PCT/CN2013/074428 CN2013074428W WO2013155982A1 WO 2013155982 A1 WO2013155982 A1 WO 2013155982A1 CN 2013074428 W CN2013074428 W CN 2013074428W WO 2013155982 A1 WO2013155982 A1 WO 2013155982A1
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catalyst
vanadium
chromium
high temperature
hours
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PCT/CN2013/074428
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English (en)
French (fr)
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程瑞华
刘柏平
薛新
何芸
董璇
何雪莲
刘振
刘伟伟
王立松
孙巧巧
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华东理工大学
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Priority claimed from CN201210118427.2A external-priority patent/CN103145897B/zh
Application filed by 华东理工大学 filed Critical 华东理工大学
Priority to US14/395,487 priority Critical patent/US9725530B2/en
Publication of WO2013155982A1 publication Critical patent/WO2013155982A1/zh

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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00Polymerisation catalysts
    • C08F4/06Metallic compounds other than hydrides and other than metallo-organic compounds; Boron halide or aluminium halide complexes with organic compounds containing oxygen
    • C08F4/22Metallic compounds other than hydrides and other than metallo-organic compounds; Boron halide or aluminium halide complexes with organic compounds containing oxygen of chromium, molybdenum or tungsten
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F10/00Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F10/02Ethene
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00Polymerisation catalysts
    • C08F4/02Carriers therefor
    • C08F4/025Metal oxides
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00Polymerisation catalysts
    • C08F4/42Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
    • C08F4/44Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
    • C08F4/60Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with refractory metals, iron group metals, platinum group metals, manganese, rhenium technetium or compounds thereof
    • C08F4/62Refractory metals or compounds thereof
    • C08F4/69Chromium, molybdenum, tungsten or compounds thereof
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/50Improvements relating to the production of bulk chemicals
    • Y02P20/52Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts

Definitions

  • the present invention relates to the field of olefin polymerization catalysts, and in particular to a supported metal oxide double active center ethylene polymerization catalyst, a preparation method thereof and an application thereof.
  • Polyethylene is a versatile plastic, widely used in industrial, agricultural, automotive, communication and daily life due to its excellent mechanical properties, electrical insulation, chemical resistance and low temperature resistance. These polyethylene products with excellent properties are closely related to the catalysts used.
  • Phillips chrome-based catalysts produce about 40% of the world's high-density polyethylene, which is unique due to its small length chain. Rheological and processing properties, especially suitable for processing large hollow containers, long-term static pressure gas pipes and water supply pipes, automobile fuel tanks, etc., and these products are currently unable to be aggregated by Ziegler-Natta catalysts, new metallocene catalysts and late transition metals.
  • the olefin catalyst has been replaced by olefin catalyst.
  • Phillips catalyst has played a very important role in the production of polyolefin industry. In recent years, China has also increased the introduction of Phillips polyethylene process and plant technology.
  • the Phillips catalyst was first reported by the researchers of JP Hogan and R ⁇ . Bank of Phillips Petroleum Company in US Pat. No. 2,825,721.
  • the patent uses chromium oxide as raw material to study the catalysis of Phillips catalyst under different conditions, including polymerization temperature, polymerization time, ratio of monomer concentration to catalyst dosage, chromium loading of catalyst, carrier modification, catalyst preparation conditions, etc. The effect of olefin polymerization properties.
  • US4295997, US4528338, US5401820 Phillips developed catalyst, such as low toxicity trivalent chromium salt as raw materials, to avoid the use of high toxic raw materials of Cr0 3.
  • Conventional vanadium catalysts are used in homogeneous Ziegler-Natta catalyst ethylene polymerization systems to adjust the molecular weight distribution and comonomer distribution of Ziegler-Natta catalyst products to improve product performance.
  • the molecular weight distribution is narrow and the molecular weight is high; the production of acetonitrile / (X-olefin copolymer, and the amount of comonomer insertion is large; syndiotactic polypropylene can also be synthesized.
  • Zakharov et al The polymerization performance of VC prepared on a MgCl 2 support was investigated. It was found that the catalyst can produce a broad molecular weight distribution of polyethylene and has a high response to hydrogen modulation.
  • Patent US 4199475 reports a catalyst prepared by supporting tetraethyl titanate and vanadium oxychloride on silica gel, which has a high ethylene polymerization activity.
  • Phillips catalysts are highly sensitive to changes in carrier composition, liquid oligomers and low molecular weight waxes or ultrahigh molecular weight polyethylene (UHMWPE) can be produced by varying the composition of the carrier or the type of carrier. Can be regulated in a wide range.
  • Two common features of the second-generation Phillips catalysts are: 1) Preparation of catalysts and polyethylene products with new properties by surface modification of the support; 2) Chromium is the only active component in the modified Phillips catalyst.
  • the carrier modification method of the second generation Phillips catalyst includes: titanium dioxide modification, magnesium oxide modification, fluorine modification, aluminum oxide modification, alkali metal modification, boron modification, and the like.
  • the second generation of modified Phillips catalysts have been used to produce polymers of varying grades for a variety of commercial applications.
  • the catalyst carrier modified by titanium dioxide can significantly enhance the activity of chromium, shorten the induction time, increase the polymerization activity and chain termination rate of the catalyst, and lower the average molecular weight of the polymer, which is generally advantageous for polymerization.
  • Phillips' R.Dietz (US3887494), B. Horvath (US3622521) and Chemplex Company's T. Pullukat (US378001) have conducted research in this area.
  • the carriers used by the two companies are the Davison series of Grace, USA. It is now a special silica gel carrier for polyolefins produced by PQ.
  • titanium dioxide There are two main ways to introduce titanium dioxide. One is that titanium and silicon are deposited in a co-gel manner and then reshaped.
  • the Ti content of the main phase and the surface of the carrier is equivalent.
  • titanium dioxide is mainly distributed on the surface of the support.
  • the fluorine modification uses a surface fluorine modifier such as ammonium hexafluorosilicate to react with the surface silicon group to release water, and at the same time form a Si-F bond on the surface of the silica gel.
  • a surface fluorine modifier such as ammonium hexafluorosilicate
  • the more electronegative F atoms on the surface of the modified silica will cause electron transfer on the surrounding atoms, thereby weakening the silicon hydroxyl bond, thereby increasing the acidity of the silica surface.
  • Rebenstrof et al. performed Fourier transform infrared spectroscopy on the unmodified and F-modified two Phillips catalysts.
  • the apparent polymerization activity shows a gradual increase with the addition of ammonium hexafluorosilicate in the system from 0.5 wt.% to 3.5 wt.%, and the introduction of fluorine
  • the density of the polymerization product has a significant adjustment effect, indicating that fluorine can promote the insertion reaction of the comonomer.
  • Kallenbach (US: 3 445 367, 1969) used direct dry mixing to modify four different fluorine compounds (NH 4 ) 2 SiF 6 , CuSiF 6 , N BF 6 and CuBF 6 to Phillips catalysts compared to conventional Phillips catalysts. These F-modified catalysts are capable of producing HDPE with a relatively narrow molecular weight distribution.
  • the researchers activated the catalyst samples with different F contents at different calcination temperatures, and found that the saturated loading of Cr(VI) was reduced by the fluorine-modified catalyst.
  • the maximum loading of Cr(VI) decreased rapidly with the increase of F load, and the sample of 87CTC decreased the most, indicating that fluoride may accelerate the sintering of silica gel at high temperature.
  • Related literature can be found in Journal of Catalysis, 76(1), 37, 1982.
  • the object of the present invention is to provide a supported metal oxide double active center ethylene polymerization catalyst and a preparation method and application thereof, the catalyst is a novel chromium valyanate double for efficiently synthesizing ethylene homopolymer and ethylene and 0C-olefin copolymer Active center catalyst, which produces polyethylene with a wide molecular weight distribution Under the premise, the content of comonomer and its distribution are improved, so that the insertion amount at the low molecular weight end is reduced, and the insertion amount at the high molecular weight end is increased, so that more ligament molecules are easily formed, and a better polymer is developed. Ethylene products, while the catalyst also has high activity, hydrogen modulation response and so on.
  • the technical scheme of the present invention is as follows - the present invention provides a supported metal oxide double active center ethylene polymerization catalyst, the catalyst composition comprising an inorganic carrier and a supported two active components, the two active components comprising chromium Oxides and vanadium oxides.
  • the present invention provides a supported metal oxide double active center ethylene polymerization catalyst, the catalyst further comprising a modifying component; and the modifying component is selected from the group consisting of titanium dioxide and fluorine.
  • the present invention provides a supported metal oxide double active center ethylene polymerization catalyst for the purpose of preparing a double active center ethylene polymerization catalyst which supports chromium and vanadium oxide on an inorganic carrier.
  • the present invention also provides the use of the supported chromium-vanadium double-site catalyst in the homopolymerization of ethylene and the copolymerization of ethylene and 0C-olefin.
  • the inorganic carrier of the present invention is selected from the group consisting of silica, alumina, titania, zirconia, magnesia, calcium oxide, inorganic clay, and combinations thereof, and the inorganic clay may include, for example, montmorillonite or the like.
  • the inorganic carrier is selected from the group consisting of silica gel, in particular amorphous silica gel. These vectors are well known in the art and can be synthesized commercially or by known methods. As an example of silica gel, Davison 955 can be mentioned.
  • the inorganic carrier used has a specific surface area of usually 50 to 500 m 2 /g, preferably 100 to 300 m 2 /g, and the inorganic carrier has a pore volume of 0.1 to 5.0 cm 3 /g, preferably 0.5 to 3.0 cm 3 /g.
  • the inorganic carrier used in the present invention may be any inorganic carrier generally used in the preparation of an olefin polymerization catalyst.
  • the dual active sites of the catalysts of this invention are provided by vanadium oxides and chromium oxides supported on the surface of the catalyst inorganic support.
  • the vanadium source is water-soluble vanadium-containing salts: such as ammonium hexafluorovanadate, vanadium nitrate, vanadyl oxalate, ammonium metavanadate, vanadyl sulfate, vanadium (IV) sulfate hydrate, vanadium sulfate (111), trichloro Generation of vanadium oxide, sodium orthovanadate, sodium metavanadate, etc., and water-insoluble vanadium salts: such as vanadium oxyacetate, vanadium triisopropoxide, vanadium tripropoxide, vanadium acetylacetonate, triethyl oxide Vanadium oxide, vanadium oxychloride, vanadium silicate, other suitable soluble vanadium salts, and combinations thereof.
  • the chromium source used is selected from the group consisting of chromium trioxide, chromium nitrate, chromium acetate, chromium chloride, chromium sulfate, ammonium chromate, ammonium dichromate, basic chromium acetate, other suitable soluble chromium salts, and combinations thereof.
  • the loading of chromium on the inorganic support is generally the total weight of the catalyst.
  • the loading of vanadium on the inorganic support is generally from 10 to 500% of the chromium loading (both in terms of the weight of chromium and vanadium), preferably from 20 to 400%, and the vanadium loading is generally a catalyst.
  • the total weight is 0.01 ⁇ 10wt°/. Preferably, it is 0.05 to 5 wt%.
  • the titanium compound raw material for preparing the titanium oxide-modified component is titanium acetylacetonate, titanium trichloride, titanium tetrachloride, titanium t-butoxide, tetra-n-butyl titanate, and sulfuric acid sulfate. Titanium, titanium sulphate, ammonium hexafluorotitanate, isopropyl titanate, tetraethyl titanate, other suitable soluble titanium salts, and combinations thereof.
  • the titanium loading is generally from 0.01 to 30% by weight, preferably from 0.05 to 20% by weight based on the total weight of the catalyst, based on the weight of Ti.
  • the raw material for preparing the fluorine-modified component may be selected from gases such as hydrogen fluoride and fluorine, or ammonium fluoride, ammonium bifluoride, ammonium fluoroborate, copper fluoroborate, silver fluoroborate, and fluoroboric acid.
  • gases such as hydrogen fluoride and fluorine, or ammonium fluoride, ammonium bifluoride, ammonium fluoroborate, copper fluoroborate, silver fluoroborate, and fluoroboric acid.
  • Gold copper fluorosilicate, copper fluorosilicate, silver fluorosilicate, gold fluorosilicate, ammonium fluoroborate and ammonium hexafluorovanadate, ammonium hexafluorosilicate, zinc fluoroborate, magnesium fluorosilicate, fluorosilicic acid Zinc, sodium fluoroborate, other suitable soluble fluoride salts, and combinations thereof.
  • the fluorine loading is generally from 0.01 to 10% by weight, preferably from 0.5 to 5% by weight based on the total weight of the catalyst, based on the weight of F.
  • a process for the preparation of a supported metal oxide double-site ethylene polymerization catalyst comprising the steps of - i) impregnating an inorganic support with a solution containing vanadium, followed by drying, followed by a high temperature Roasting activation at 300 ⁇ 900 °C;
  • step i) The product obtained in the step i) is impregnated with a solution containing chromium, then dried, and then calcined and activated at a high temperature of 300 to 900 ° C to obtain the catalyst for storage.
  • the immersion time is l ⁇ 12h, preferably 4 ⁇ 8h
  • the immersion temperature is 10 ⁇ 80°C, preferably 20 ⁇ 70°C
  • drying at 90 ⁇ 250°C Preferably, the temperature is from 100 to 200 ° C
  • the drying time is from 6 to 20 h, preferably from 8 to 15 h, and vacuum drying can also be used in the drying process
  • the sample is activated by high temperature roasting in an inert gas or oxygen or air
  • the calcination temperature is from 300 to 900.
  • °C Preferably, it is 400 ⁇ 800 ° C, the time is l ⁇ 10h, preferably 4 ⁇ 6h, and then cooled, wherein when it is cooled to 300 ⁇ 400 °C, it is switched to an inert gas such as nitrogen or argon, and is naturally cooled;
  • an inert gas such as nitrogen or argon
  • the immersion time is l ⁇ 12h, preferably 4 ⁇ 8h
  • the immersion temperature is 10 ⁇ 80°C, preferably 15 ⁇ 60°C, then at 90 ⁇ Drying between 250 ° C, preferably 100 ⁇ 150 ° C, drying time 6 ⁇ 20h, preferably 8 ⁇ 15h, vacuum can also be used in the drying process
  • the above sample is activated in inert gas or oxygen or air, roasting temperature
  • the time is l ⁇ 10h, preferably 3 ⁇ 8h, and then cooled, and switched to an inert gas such as nitrogen or argon when cooled to 300-400 ° C, naturally After cooling, the catalyst was obtained for storage.
  • the present invention utilizes an inorganic compound as a carrier, first impregnating a vanadium source thereon, and then calcining at a high temperature to obtain a vanadium-supporting catalyst precursor; and then adding an inorganic chromium source to the solution containing the catalyst precursor, Thus, a supported chromium vanadium double active site catalyst was prepared.
  • the above step i) is a method of supporting a vanadium source on an inorganic carrier such as the inorganic carrier described above.
  • the method for supporting the vanadium source on the inorganic support may be any known method of supporting vanadium on a support.
  • a method of supporting a vanadium source on an inorganic support comprises impregnating a porous inorganic support with a vanadium source solution.
  • agitation preferably continuous agitation, can be carried out during the impregnation.
  • the stirring is carried out for about 1 to 12 hours, preferably about 4 to 8 hours, and the immersion temperature is 10 to 80 ° C, preferably 20 to 70 ° C.
  • the vanadium loading is from 0.01 to 10% by weight, preferably from about 0.05 to 5% by weight, based on the total weight of the catalyst.
  • the resulting support carrying the vanadium component is then dried.
  • the drying is usually carried out at room temperature to 25 CTC, preferably at about 90 to 250 ° C, more preferably at about 100 to 200 ° C.
  • the drying is carried out at about 12 CTC. This drying can also be carried out under vacuum.
  • the drying time is not particularly limited, but the drying usually lasts for about 6 to 20 hours, preferably about 7 to 18 hours, and more preferably about 8 to 15 hours.
  • the inorganic carrier loaded with the vanadium component is calcined.
  • the manner in which the calcination is carried out is not particularly limited, but the calcination is preferably carried out in a fluidized bed.
  • the calcination is usually carried out in two stages, a low temperature stage and a high temperature stage.
  • the low temperature stage is usually carried out at about 100 to 300 °C.
  • This high temperature stage is usually carried out at about 300 to 900 °C.
  • the physical water adsorbed in the carrier at the low temperature stage is substantially removed, and a part of the hydroxyl groups on the inorganic carrier are removed at the high temperature stage.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably under an inert gas atmosphere, such as nitrogen, helium, argon or the like, preferably under a nitrogen atmosphere, such as high purity. Nitrogen.
  • the high temperature stage calcination is carried out under air or oxygen conditions, preferably under dry air conditions. After the completion of the calcination, the obtained inorganic carrier loaded with vanadium in the form of an inorganic oxide is cooled from a high temperature stage. According to one embodiment, after cooling to
  • the atmosphere can be changed, for example, from air to an inert gas such as nitrogen or argon.
  • the cooling is natural cooling.
  • the above step ii) is a method of supporting an inorganic chromium source on a vanadium-loaded inorganic carrier (for example, the inorganic carrier described above) prepared in the step i).
  • the method for supporting the inorganic chromium source on the inorganic carrier previously loaded with vanadium may be any method known to those skilled in the art for supporting chromium on a support, for example, conventionally known preparation of Phillips catalyst may be mentioned. method.
  • the inorganic chromium source can be the inorganic chromium source described above.
  • agitation preferably continuous agitation, can be carried out during the impregnation. Generally, the agitation is for about 1 to about 12 hours, preferably about 4 to 8 hours.
  • the inorganic chromium is supported in an amount of from about 0.01 to about 10% by weight, preferably from about 0.05 to 5% by weight, further preferably from about 0.1 to 3% by weight based on the total weight of the catalyst.
  • the resulting support is then dried.
  • the drying is usually carried out at a temperature of from about room temperature to 200 ° C; for example, from about 15 ° C to 25 CTC, preferably from about 9 CTC to 250 ° C, and more preferably from about 10 CTC to 200 ° C.
  • the drying is carried out at about 12 CTC.
  • the drying time is not particularly limited, but the drying usually lasts for about 6 to 20 hours, preferably about 7 to 18 hours, and more preferably about 8 to 15 hours.
  • the metal-supported inorganic carrier is calcined.
  • the manner in which the calcination is carried out is not particularly limited, but the calcination is preferably carried out in a fluidized bed.
  • the calcination is usually carried out in two stages, a low temperature stage and a high temperature stage.
  • This low temperature stage is usually carried out at about 100 to 300 °C.
  • This high temperature stage is usually carried out at about 300 to 900 °C.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 8 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably under an inert gas, such as an atmosphere of nitrogen, helium, argon or the like, preferably under a nitrogen atmosphere, such as high purity. Nitrogen.
  • the high temperature stage calcination is carried out under air or oxygen conditions, preferably under dry air conditions. After the completion of the roasting, the resulting negative The inorganic carrier carrying the metal is cooled from the high temperature stage.
  • the atmosphere when cooling to a temperature of 300 to 400 ° C after high-temperature baking, the atmosphere can be changed, for example, from air to an inert gas such as nitrogen or the like.
  • the cooling is natural cooling.
  • the obtained catalyst was stored under an inert gas atmosphere for use.
  • the specific operation of preparing the catalyst of the present invention comprises: immersing the porous amorphous silica gel in a certain concentration of ammonium metavanadate solution, and the vanadium loading amount meets the requirements of the present invention with respect to the total weight of the catalyst (for example, 0.1 to 10 wt%,
  • the weight of vanadium is: after continuous stirring for a certain period of time (for example, 4 to 8 hours), the temperature is dried; the silica support loaded with ammonium metavanadate is calcined in a fluidized bed at a low temperature stage (for example, 100°).
  • the physical water in the carrier is removed by roasting in a nitrogen atmosphere, and is partially calcined in a dry air at a high temperature stage (for example, 300 ° C to 900 ° C) to remove a part of the hydroxyl group on the surface of the silica gel. For a certain period of time (for example, 3 to 8 hours); natural cooling and cooling, switching to nitrogen protection when cooled to 300 ⁇ 400 ° C, to obtain a vanadium-bearing catalyst precursor.
  • a high temperature stage for example, 300 ° C to 900 ° C
  • the inorganic chromium source is supported on the catalyst precursor prepared by the above method, and the chromium loading is in accordance with the requirements of the present invention (for example, 0.1 to 1 wt% of the total weight of the catalyst, based on the weight of chromium), and continuously stirred for a certain period of time (for example, 4) After ⁇ 8 hours), the temperature is raised and dried; then high temperature baking is carried out in a fluidized bed, wherein in the low temperature stage (for example, 100 ° C ⁇ 300 ° C), the physical water adsorbed in the silica carrier is removed by roasting in a nitrogen atmosphere at a high temperature.
  • the low temperature stage for example, 100 ° C ⁇ 300 ° C
  • Stage for example, 300 ° C ⁇ 900 ° C in the dry air to remove part of the hydroxyl surface of the silica gel, in this high temperature period for a certain period of time (for example, 3 ⁇ 8 hours); natural cooling and cooling, cooling to 300 ⁇ 400 At °C, switch to nitrogen protection, transfer under nitrogen protection, and store the catalyst for later use.
  • the present invention provides a method for preparing a supported metal oxide dual active center ethylene polymerization catalyst comprising the following steps:
  • the method comprises the steps of: i) mixing a mixed salt solution containing chromium vanadium on an inorganic carrier by a co-impregnation method, the immersion time is from 1 to 12 h, preferably from 4 to 8 h.
  • the immersion temperature is 10 ⁇ 80 ° C, preferably 20 ⁇ 70 ° C, and then dried between 90 ⁇ 250 ° C, preferably 100 ⁇ 200 ° C, drying time 6 ⁇ 20h, preferably 8 ⁇ 15h, during the drying process Vacuum can be used; ⁇ )
  • the above sample is activated by high-temperature roasting in an inert gas or oxygen or air at a calcination temperature of 300 to 900 ° C, preferably 400 to 800 ° C for 1 to 10 h, preferably 3 to 8 h, followed by cooling, cooling When it is 300 to 400 ° C, it is switched to an inert gas such as nitrogen or argon, and naturally cooled to obtain the catalyst for storage.
  • an inert gas such as nitrogen or argon
  • the above step i) is a method of simultaneously supporting an inorganic vanadium source and a vanadium source on an inorganic carrier such as the inorganic carrier described above.
  • the inorganic chromium source may be the inorganic chromium source described above, and the vanadium source may be any vanadium source as described above.
  • heating agitation may be carried out, preferably continuous heating agitation. Generally, the agitation is carried out for about 1 to 12 hours, preferably for about 4 to 8 hours, and the immersion temperature is 10 to 80 ° C, preferably 20 to 70 ° C.
  • the inorganic chromium is supported in an amount of 0.01 to 10% by weight, preferably 0.05 to 5% by weight, more preferably 0.1 to 2% by weight based on the total mass of the catalyst.
  • the vanadium loading is 0.01 to 10% by weight, preferably about 0.05 to 5% by weight based on the total weight of the catalyst.
  • the resulting support is then dried. The drying is usually carried out at a temperature of from about room temperature to 25 CTC; preferably from 9 CTC to 250 ° C, further preferably from 10 CTC to 200 °C.
  • the drying time is not particularly limited, but the drying usually lasts for about 6 to 20 hours, preferably about 7 to 18 hours, and more preferably about 8 to 15 hours.
  • the above step ii) is, after drying, the inorganic support impregnated with the chromium and vanadium compound is calcined, and finally the chromium vanadium oxide is supported on the surface of the inorganic support.
  • the manner in which the calcination is carried out is not particularly limited, but the calcination is preferably carried out in a fluidized bed. According to one embodiment, the calcination is usually carried out in two stages, a low temperature stage and a high temperature stage. This low temperature stage is usually carried out at about 100 to 300 °C. This high temperature stage is usually carried out at about 300 to 900 °C.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably under an inert gas, such as an atmosphere of nitrogen, helium, argon or the like, preferably under a nitrogen atmosphere, such as high purity. Nitrogen.
  • the high temperature stage calcination is carried out under air or oxygen conditions, preferably under dry air conditions.
  • the obtained metal oxide-supporting inorganic carrier is cooled from a high temperature stage.
  • the atmosphere can be changed, for example, from air to an inert gas such as nitrogen.
  • the cooling is natural cooling.
  • the obtained catalyst was stored under an inert gas atmosphere for use.
  • the specific operation of preparing the catalyst of the present invention comprises: immersing the porous amorphous silica gel in a certain concentration of an aqueous solution of ammonium metavanadate and basic chromium acetate, and the loading of vanadium and chromium is consistent with the total weight of the catalyst.
  • Requirements for example, 0.1 to 10 wt% of vanadium, 0.1-2 wt% of chromium); after continuous stirring for a certain period of time (for example, 4 to 8 hours), the temperature is dried; then, high temperature roasting is carried out in a fluidized bed, wherein in the low temperature stage (for example, 100 ° C ⁇ 300 ° C) roasting in a nitrogen atmosphere to remove the physical water adsorbed in the carrier, in the high temperature stage (for example, 300 ° C ⁇ 900 ° C) in the dry air to remove part of the hydroxyl surface of the silica gel, in This high temperature stage is kept for a certain period of time (for example, 3 ⁇ 8 hours); natural cooling is cooled, and when it is cooled to 300 ⁇ 400 °C, it is switched to nitrogen protection, transferred under nitrogen protection, and the catalyst is stored for use.
  • the invention provides another preparation method of the supported metal oxide double active center ethylene polymerization catalyst comprising the following steps:
  • step i) The product obtained in the step i) is impregnated with a solution containing vanadium, then dried, and then calcined and activated at a high temperature of 300 ° C to 900 ° C to obtain a catalyst for storage.
  • the method comprises the steps of: i) impregnating a chromium salt solution on an inorganic carrier, the immersion time is from 1 to 12 h, preferably from 4 to 8 h, and the immersion temperature is from 10 to 80.
  • the above step i) is a method of supporting an inorganic chromium source on an inorganic carrier such as the inorganic carrier described above.
  • the method for supporting the inorganic chromium source on the inorganic support may be any method known to those skilled in the art to support the chromium on the support, and for example, a conventionally known method for preparing a Phillips catalyst may be mentioned.
  • the inorganic chromium source can be the inorganic chromium source described above.
  • agitation preferably continuous agitation, can be carried out during the impregnation. Generally, the agitation is for about 1 to 12 hours, preferably about 4 to 8 hours.
  • the loading of chromium is from about 0.01 to 10% by weight, preferably from about 0.05 to 5% by weight, further preferably from about 0.1 to 2% by weight, based on the total weight of the catalyst.
  • the resulting support is then dried.
  • the drying is usually carried out at a temperature of from about room temperature to 20 CTC; for example, from 15 ° C to 200 ° C, preferably from 2 CTC to 200 ° C, further preferably from 100 ° C to 200 ° C.
  • the drying is carried out at about 12 CTC.
  • the drying time is not particularly limited, but the drying usually lasts for about 6 to 20 hours, preferably about 7 to 18 hours, and more preferably about 8 to 15 hours.
  • the metal-supported inorganic carrier is calcined.
  • the manner in which the calcination is carried out is not particularly limited, but the calcination is preferably carried out in a fluidized bed.
  • the calcination is usually carried out in two stages, a low temperature stage and a high temperature stage.
  • This low temperature stage is usually carried out at about 100 to 300 °C.
  • This high temperature stage is usually carried out at about 300 ° C to 900 ° C.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably an inert gas gas, more preferably under a nitrogen atmosphere, such as high purity nitrogen.
  • the high temperature calcination stage is carried out in an inert gas or air, preferably drying high purity air. After the completion of the calcination, the obtained metal-loaded inorganic carrier is cooled from a high temperature stage.
  • the atmosphere can be switched, for example, from air to an inert gas, such as nitrogen, when cooled to a temperature of 300 to 400 ° C after high temperature calcination.
  • the cooling is natural cooling.
  • the obtained catalyst was stored in an inert gas atmosphere for use.
  • the above step ii) is a method of further supporting a vanadium source on a chromium-carrying inorganic carrier (for example, the inorganic carrier described above) prepared in the step i).
  • the method for supporting the vanadium source on the inorganic support may be any known method of supporting vanadium on a support.
  • a method of supporting a vanadium source on an inorganic carrier previously loaded with chromium comprises impregnating the porous inorganic carrier previously loaded with chromium with a vanadium source solution.
  • agitation may be carried out during the impregnation process, Continuous stirring is preferred.
  • the stirring is carried out for about 1 to 12 hours, preferably for about 4 to 8 hours, and the immersion temperature is 10 to 80 ° C, preferably 20 to 70 ° C.
  • the vanadium loading is from 0.01 to 10% by weight, preferably from about 0.05 to 5% by weight, based on the total weight of the catalyst.
  • the resulting support impregnated with the vanadium component is then dried.
  • the drying is usually carried out at a temperature of from about room temperature to 20 CTC; for example, at about 15 to 200 ° C, preferably 20 to 200 ° C, and more preferably about 100 to 200 ° C.
  • the drying is carried out at about 120 °C. This drying can also be carried out under vacuum.
  • the drying time is not particularly limited, but the drying usually lasts for about 6 to 20 hours, preferably about 7 to 18 hours, and more preferably about 8 to 15 hours.
  • the sample impregnated with the vanadium component is calcined.
  • the manner in which the calcination is carried out is not particularly limited, but the calcination is preferably carried out in a fluidized bed. According to one embodiment, the calcination is usually carried out in two stages, a low temperature stage and a high temperature stage.
  • the low temperature stage is usually carried out at about 100 to 300 °C.
  • This high temperature stage is usually carried out at about 300 to 900 °C.
  • the physical water adsorbed in the carrier is substantially removed during the low temperature phase, and a portion of the hydroxyl groups on the inorganic carrier are removed during the high temperature phase.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably under an inert gas atmosphere, such as the inert gas described above.
  • the high temperature stage calcination is carried out under air or oxygen conditions, preferably under dry air conditions.
  • the obtained inorganic carrier loaded with vanadium and chromium in the form of inorganic oxide is cooled from a high temperature stage.
  • the atmosphere can be changed, for example, from air to an inert gas such as nitrogen, argon or the like, upon cooling to a temperature of 300 to 400 °C.
  • the cooling is a natural temperature-cooling cooling, and the catalyst is saved for storage.
  • the specific operation of preparing the catalyst of the present invention comprises: immersing the porous amorphous silica gel in an aqueous solution of an inorganic chromium source, the chromium loading is in accordance with the requirements herein (for example, 0.1 to 2 wt% of the total weight of the catalyst, and the weight of chromium After continuous stirring for a certain period of time (for example, 3-8 hours), the temperature is dried; then, high temperature calcination is carried out in a fluidized bed, wherein the carrier is calcined in a low temperature stage (for example, 100 ° C to 300 ° C) in a nitrogen atmosphere.
  • a low temperature stage for example, 100 ° C to 300 ° C
  • the physical water adsorbed in the high temperature stage (for example, 300 ° C ⁇ 900 ° C) is baked in dry air to remove some of the hydroxyl groups on the surface of the silica gel, and is kept at a high temperature for a certain period of time (for example, 3 to 8 hours); Cooling, switching to nitrogen protection when cooled to 300 ⁇ 400 °C, transferring under nitrogen protection, saving for use, then immersing the obtained catalyst precursor in a certain concentration of ammonium metavanadate solution, vanadium loading relative to the catalyst Total weight meets the requirements of this document (for example, 0.1 to 10 wt%, based on the weight of vanadium); after continuous stirring for a certain period of time (for example, 4 to 8 hours), the temperature is dried; the catalyst precursor impregnated with ammonium metavanadate is calcined at a high temperature in a fluidized bed.
  • a certain period of time for example, 3 to 8 hours
  • the invention provides a preparation method of a supported metal oxide double active center ethylene polymerization catalyst comprising the following steps:
  • Chromium-vanadium double-site catalyst prepared by any of the above three methods, including three kinds of supported chromium-vanadium double-centers containing vanadium-loaded chromium, chromium-vanadium simultaneous loading, and chrome-loaded vanadium Any one of the catalysts;
  • the method comprises the steps of:
  • the above method is a pre-reduction activation treatment of the obtained supported chromium-vanadium double-site catalyst.
  • Step i) is to prepare a supported chromium-vanadium double-site catalyst by any one of the above three methods, and step ii) is to carry out the supported chromium-vanadium double-site catalyst by adding an organometallic cocatalyst under an inert atmosphere.
  • the pre-reduction activation treatment, the organometallic cocatalyst comprises an organoaluminum compound, an organolithium compound, an organoboron compound, or the like, any cocatalyst for olefin polymerization known to those skilled in the art, or a combination thereof.
  • the organoaluminum compound used as a cocatalyst may include tridecyl aluminum ruthenium 1, dinonyl ruthenium oxide aluminum AlR 2 OR, dimercaptoalkylaluminum ruthenium ruthenium, aluminum ruthenium hydride, ethyl sesquichloride And the like, wherein R is a fluorenyl group, for example, a fluorenyl group having 1 to 12 carbon atoms, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, n-pentyl, N-hexyl, n-heptyl, n-octyl, n-decyl, n-decyl, etc.
  • X is a halogen, for example Fluorine, chlorine, bromine and iodine, preferably chlorine.
  • the aluminoxane may include a reaction of all of the bismuth aluminum and water such as methylaluminum oxyhydroxide (MAO).
  • the organoaluminum compounds as the cocatalyst may be used singly or in combination of two or more kinds.
  • the aluminum compound may, for example, be triethyl aluminum, triisobutyl aluminum, diethyl aluminum ethoxide, diethyl aluminum dichloride, methyl aluminoxane or the like.
  • the aluminum/chromium molar ratio is between 0 and 1000, preferably 0 to 100, more preferably 0 to 50, and the reduction activation treatment
  • the temperature is between room temperature and 10CTC, preferably between room temperature and -6CTC, and the reduction activation treatment time is 0.5-20 hours, preferably 0.5-10 hours.
  • the reduction activation treatment adopts stirring mode, preferably continuous stirring, and then 60 ⁇ 120° after the treatment is completed.
  • the drying between C and C is carried out for 2 to 8 hours, and the drying is carried out under an inert gas atmosphere, for example, under an atmosphere of nitrogen, helium or argon, preferably under a nitrogen atmosphere, and the drying process can also be carried out under vacuum.
  • the obtained pre-reductively activated supported chromium-vanadium composite catalyst is stored for use in an inert gas atmosphere.
  • the specific operation of preparing the catalyst of the present invention comprises: immersing the porous amorphous silica gel in a certain concentration of ammonium metavanadate solution, and the vanadium loading amount meets the requirements of the present invention with respect to the total weight of the catalyst (for example, 0.1 to 10 wt%,
  • the weight of vanadium is: after continuous stirring for a certain period of time (for example, 4 to 8 hours), the temperature is dried; the silica support loaded with ammonium metavanadate is calcined in a fluidized bed at a low temperature stage (for example, 100°).
  • the physical water adsorbed in the carrier is removed by roasting in a nitrogen atmosphere, and is partially calcined in a dry air at a high temperature stage (for example, 300 ° C to 900 ° C) to remove a part of the hydroxyl group on the surface of the silica gel. Keep it for a certain period of time (for example, 3 ⁇ 8 hours); cool down naturally, switch to nitrogen protection when cooling to 300 ⁇ 400 °C, and obtain vanadium-bearing catalyst precursor.
  • a high temperature stage for example, 300 ° C to 900 ° C
  • the inorganic chromium source is supported on the catalyst precursor prepared by the above method, and the chromium loading is in accordance with the requirements herein (for example, 0.1 to 3 wt% of the total weight of the catalyst, based on the weight of chromium), and continuously stirred for a certain period of time (for example, 3) After ⁇ 8 hours), the temperature is raised and dried; then high temperature baking is carried out in a fluidized bed, wherein in the low temperature stage (for example, 100 ° C ⁇ 300 ° C), the physical water adsorbed in the carrier is removed by roasting in a nitrogen atmosphere, at a high temperature stage.
  • the low temperature stage for example, 100 ° C ⁇ 300 ° C
  • the catalyst is pre-reduced and activated by adding triethylaluminum, the aluminum/chromium molar ratio is 0-50, the treatment temperature is -60 V at room temperature, continuous stirring is carried out for 0.5-10 hours, and then dried at 60-120 ° C.
  • the drying is carried out under an inert gas atmosphere, for example, under an atmosphere of nitrogen, helium, argon or the like, preferably under a nitrogen atmosphere, and the drying process can also be carried out under vacuum.
  • Pre-reduced activated chromium vanadium complex The catalyst is stored in an inert gas atmosphere for use.
  • a titanium dioxide-modified inorganic carrier may be prepared, and then a chromium and vanadium active component may be further loaded to obtain a catalyst, wherein the titanium dioxide-modified inorganic carrier may be impregnated, coprecipitated or sol-condensed.
  • Preparation by a gel method wherein one preparation method is as follows - i) dissolving the titanium compound in a solvent and stirring with an inorganic carrier to carry out a reaction, and drying the product after the reaction;
  • the dried product is calcined at a high temperature of 300 to 900 ° C to obtain the titanium oxide-modified inorganic carrier.
  • the method comprises the steps of: i) dissolving the titanium compound in a solvent and then impregnating it on an inorganic carrier, the immersion time is from 1 to 12 h, preferably from 4 to 8 h, and the immersion temperature is 10 ⁇ 80 ° C, preferably 20 ⁇ 70 ° C, and then dried at 50 ⁇ 200 ° C, preferably 70 ⁇ 150 ° C, drying time 6 ⁇ 20h, preferably 8 ⁇ 15h, vacuum drying can also be used in the drying process;
  • the above sample is activated by high-temperature calcination in an inert gas or oxygen or air, and the calcination temperature is 300-900 ° C, preferably 400-800 ° C, the time is l ⁇ 10 h, preferably 4-6 h, and then cooled, wherein When cooling to 300 ⁇ 400 °C, switch to an inert gas such as nitrogen or argon, and naturally cool.
  • an inert gas such as nitrogen or argon
  • the above step i) is to impregnate the titanium compound onto an inorganic carrier such as the inorganic carrier described above.
  • the titanium compound is the same as described above.
  • a method of supporting a titanium compound on an inorganic carrier comprises impregnating a porous inorganic carrier with a solution of a titanium compound.
  • agitation preferably continuous agitation, can be carried out during the impregnation process.
  • the stirring is carried out for about 1 to 12 hours, preferably for about 4 to 8 hours, and the immersion temperature is 10 to 80 ° C, preferably 20 to 70 ° C.
  • the titanium loading is from 0.01 to 30% by weight, preferably from 0.05 to 20% by weight, based on the total weight of the catalyst.
  • the obtained carrier impregnated with the titanium compound is then dried.
  • the drying time is not particularly limited, but the drying usually lasts for about 6 to 20 hours, preferably about 7 to 18 hours, and more preferably about 8 to 15 hours.
  • the drying temperature is from room temperature to 250 V, preferably from 50 to 200 ° C, further preferably from 70 to 150 ° C, and vacuum drying may also be employed during the drying process.
  • the above step ii) is to calcine the inorganic carrier impregnated with the titanium compound.
  • the manner in which the calcination is carried out is not particularly limited, but the calcination is preferably carried out in a fluidized bed.
  • the calcination is usually carried out in two stages, a low temperature stage and a high temperature stage.
  • the low temperature stage is usually carried out at about 100 to 300 °C.
  • This high temperature stage is usually carried out at about 300 to 900 °C.
  • the physical water adsorbed in the temperature stage carrier is substantially removed, and a part of the hydroxyl groups on the inorganic carrier are removed at the high temperature stage.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably under an inert gas atmosphere, such as an atmosphere of nitrogen, helium, argon or the like, preferably under a nitrogen atmosphere, for example High purity nitrogen.
  • the high temperature stage calcination is carried out under air or oxygen conditions, preferably under dry air conditions. After the completion of the calcination, the obtained inorganic carrier loaded with titanium oxide is cooled from a high temperature stage.
  • the atmosphere can be changed, for example, from air to an inert gas such as nitrogen, argon or the like, upon cooling to a temperature of 300 to 400 °C.
  • the cooling is natural cooling.
  • the obtained titanium dioxide-modified inorganic carrier was transferred to a jar and placed in a desiccator for storage.
  • the specific operations for preparing the titanium dioxide-modified inorganic carrier of the present invention by the above method include:
  • the dried product is calcined in a fluidized bed at a low temperature stage (for example, 100 ⁇ ) 300 ° C) roasting in a nitrogen atmosphere to remove the physical water in the carrier, in the high temperature stage (for example, 300 ° C ⁇ 900 ° C) in the dry air to remove part of the hydroxyl surface of the carrier surface, in this high temperature period for a certain period of time (for example, 3 ⁇ 8 hours); Natural cooling and cooling, switching to nitrogen protection when cooled to 300 ⁇ 400 °C, the titanium dioxide modified silica gel is obtained, transferred to a jar, and stored in a desiccator for storage.
  • a low temperature stage for example, 100 ⁇
  • 300 ° C high temperature stage
  • Natural cooling and cooling, switching to nitrogen protection when cooled to 300 ⁇ 400 °C the titanium dioxide modified silica gel is obtained, transferred to a jar, and stored in a desiccator for storage.
  • a method for preparing the titanium dioxide-modified inorganic carrier is as follows - i) mixing a titanium compound and a silicic acid compound to carry out a reaction, and drying the product after the reaction; ⁇ ) after drying The product is calcined at a high temperature of 300 to 900 ° C to obtain the titanium oxide-modified inorganic carrier.
  • the method comprises the following steps: - i) mixing a solution of a titanium compound and a silicic acid compound to carry out a coprecipitation reaction at a reaction temperature of 10 to 100 ° C, preferably 20 to 60 ° C , the reaction time is 2 ⁇ 10 h, preferably 3 ⁇ 8 h. Then at 50 ⁇ 200°C Drying, preferably 70 ⁇ 150 ° C, drying time 6 ⁇ 20h, preferably 8 ⁇ 15h, vacuum drying can also be used in the drying process;
  • the above sample is activated by high-temperature calcination in an inert gas or oxygen or air, and the calcination temperature is 300-900 ° C, preferably 400-800 ° C, the time is l ⁇ 10 h, preferably 4-6 h, and then cooled, wherein When it is cooled to 300 ⁇ 400 °C, it is switched to an inert gas such as nitrogen or argon, and it is naturally cooled.
  • the obtained titanium dioxide-modified inorganic carrier was transferred to a jar and placed in a desiccator for storage.
  • the above step i) is a coprecipitation of a titanium compound and a silicic acid compound.
  • the titanium compound is the same as above.
  • the silicic acid compound is selected from the group consisting of aluminum silicate, sodium silicate, ethyl orthosilicate, magnesium silicate and calcium silicate, other suitable soluble silicates, and combinations thereof.
  • the ratio of the amount of the titanium compound to the silicic acid compound is calculated based on the desired titanium content.
  • the titanium loading is 0.01 to 30% by weight, preferably about 0.05 to 20% by weight based on the total weight of the catalyst. .
  • the coprecipitation reaction temperature is 10 to 100 ° C, preferably 20 to 60 V, and the reaction time is 2 to 10 h, preferably 3 to 8 h.
  • the resulting sample was then dried. Wherein, the drying temperature is 50 to 200 ° C, preferably 70 to 150 ° C, and the drying time is 6 to 20 hours, preferably 8 to 15 hours, and vacuum drying may also be employed
  • the above step ii) is to calcine the coprecipitate of the titanium compound and the silicic acid compound.
  • the manner in which the calcination is carried out is not particularly limited, but the calcination is preferably carried out in a fluidized bed.
  • the calcination is usually carried out in two stages, a low temperature stage and a high temperature stage.
  • the low temperature stage is usually carried out at about 100 to 300 °C.
  • This high temperature stage is usually carried out at about 300 to 900 °C.
  • the physical water adsorbed in the carrier at the low temperature stage is substantially removed, and a part of the hydroxyl groups on the inorganic carrier are removed at the high temperature stage.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably under an inert gas atmosphere, such as an atmosphere of nitrogen, helium, argon or the like, preferably under a nitrogen atmosphere, for example High purity nitrogen.
  • the high temperature stage calcination is carried out under air or oxygen conditions, preferably under dry air conditions. After the completion of the calcination, the obtained inorganic carrier loaded with titanium oxide is cooled from a high temperature stage.
  • the atmosphere can be changed, for example, from air to an inert gas such as nitrogen, argon or the like, upon cooling to a temperature of 300 to 400 °C.
  • the cooling is natural cooling.
  • the obtained titanium dioxide-modified inorganic carrier was transferred to a jar and placed in a desiccator for storage.
  • the specific operations of preparing the titanium dioxide-modified inorganic carrier of the present invention by the above method include:
  • the reaction is carried out by mixing tetraethyl titanate and sodium silicate, wherein the titanium loading is in accordance with the requirements of the present invention (for example, 0.05 to 20% by weight, based on the weight of Ti), and is impregnated at 20 to 60 ° C. 3 ⁇ 8h, then drying at 70 ⁇ 150°C for 8 ⁇ 15h; the dried product is calcined in a fluidized bed at a high temperature, wherein the carrier is calcined in a low temperature stage (for example, 100 ⁇ 300°C) in a nitrogen atmosphere.
  • the titanium loading is in accordance with the requirements of the present invention (for example, 0.05 to 20% by weight, based on the weight of Ti)
  • the dried product is calcined in a fluidized bed at a high temperature, wherein the carrier is calcined in a low temperature stage (for example, 100 ⁇ 300°C) in a nitrogen atmosphere.
  • the physical water in the high temperature stage (for example, 300 ° C ⁇ 900 ° C) in the dry air to remove part of the hydroxyl surface of the carrier surface, in this high temperature period for a certain period of time (for example, 3 to 8 hours); natural cooling and cooling
  • a certain period of time for example, 3 to 8 hours
  • natural cooling and cooling When it is cooled to 300 ⁇ 400 °C, it is switched to nitrogen protection, and the titanium dioxide modified silica gel is transferred to a jar and placed in a desiccator for storage.
  • a method for preparing the titanium dioxide-modified inorganic carrier is as follows - i) hydrolyzing a titanium compound with water and absolute ethanol, and then adding a mineral acid and an inorganic carrier to carry out the reaction. After drying, the product is dried;
  • the dried product is calcined at a high temperature of 300 to 900 ° C to obtain the titanium oxide-modified inorganic carrier.
  • the method comprises the steps of: i) dissolving a titanium compound in anhydrous ethanol to form a solution A, and dropping it into a mixed solution B of distilled water and absolute ethanol (in solution B)
  • the inorganic acid is added to adjust the pH value between 1 and 5, preferably between 2 and 4, and the titanium compound is hydrolyzed to obtain a Ti0 2 sol.
  • the inorganic carrier is added to the above 110 2 sol and stirred well, and the stirring temperature is 10 to 100 ° C, preferably 20 to 60 ° C, and the stirring time is 2 to 10 h, preferably 3 to 8 h.
  • drying at 60 ⁇ 200, preferably 70 ⁇ 150°C, drying time 6 ⁇ 20h, preferably 8 ⁇ 15h vacuum drying can also be used during drying;
  • the above sample is activated by high-temperature calcination in an inert gas or oxygen or air, and the calcination temperature is 300-900 ° C, preferably 400-800 ° C, the time is l ⁇ 10 h, preferably 4-6 h, and then cooled, wherein When it is cooled to 300 ⁇ 400 °C, it is switched to an inert gas such as nitrogen or argon, and it is naturally cooled.
  • the obtained titanium dioxide-modified inorganic carrier was transferred to a jar and placed in a desiccator for storage.
  • the above step i) is a hydrolysis reaction of a titanium compound, and is mixed with an inorganic carrier to obtain an inorganic carrier and a gel of 110 2 .
  • the titanium compound is the same as described above.
  • the above inorganic acid is selected from the group consisting of nitric acid, hydrochloric acid and sulfuric acid, and the concentration of the inorganic acid is 1.0 mol/L.
  • the solution is introduced, B is formed by mixing and mixing two solutions;
  • the volume ratio of the titanium compound to the absolute ethanol is (0.3 to 1.5): 2, preferably (0.5 to 1.2): 2; in the solution B, the volume ratio of distilled water to absolute ethanol is (50) ⁇ 150) : 1, preferably (70 ⁇ 130): 1;
  • the pH of the solution B is 1 to 5, preferably 2 to 4.
  • the temperature is 20-100 ° C, preferably 20-40 ° C, and the time is 2-6 hours, preferably 3-5 hours.
  • the titanium loading is from 0.01 to 30% by weight, preferably from about 0.05 to 20% by weight, based on the total weight of the catalyst.
  • the inorganic carrier is then obtained and Ti0 2 gel is dried.
  • the drying step time is 6-20 hours, preferably 8-15 hours, and the temperature is from room temperature to 25 CTC, preferably from about 50 to 200 °C, further preferably from about 70 to 150 °C. Vacuum drying can also be used during the drying process.
  • the above step ii) is to calcine the dried inorganic carrier-1 0 2 gel.
  • the manner in which the calcination is carried out is not particularly limited, but the calcination is preferably carried out in a fluidized bed.
  • the calcination is usually carried out in two stages, a low temperature stage and a high temperature stage.
  • the low temperature stage is usually carried out at about 100 to 300 °C.
  • This high temperature stage is usually carried out at about 300 to 900 °C.
  • the physical water adsorbed in the carrier at the low temperature stage is substantially removed, and a part of the hydroxyl groups on the inorganic carrier are removed at the high temperature stage.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably under an inert gas atmosphere, such as an atmosphere of nitrogen, helium, argon or the like, preferably under a nitrogen atmosphere, for example High purity nitrogen.
  • the high temperature stage calcination is carried out under air or oxygen conditions, preferably under dry air conditions. After the completion of the calcination, the obtained inorganic carrier loaded with titanium oxide is cooled from a high temperature stage.
  • the atmosphere can be changed, for example, from air to an inert gas such as nitrogen, argon or the like, upon cooling to a temperature of 300 to 400 °C.
  • the cooling is natural cooling.
  • the obtained titanium dioxide-modified inorganic carrier was transferred to a jar and placed in a desiccator for storage.
  • the preparation of the titanium dioxide-modified inorganic carrier of the present invention by the above method includes: dissolving titanium t-butoxide in absolute ethanol in a volume ratio of titanium t-butoxide to absolute ethanol (0.5-1.2): 2 into liquid A, then distilled water and absolute ethanol by volume ratio (70 ⁇ 130) : 1 into B liquid, add concentrated nitric acid to adjust B liquid pH range between 2 ⁇ 4, mix A liquid and B liquid A Ti0 2 sol is obtained, wherein the titanium loading amount meets the requirements of the present invention with respect to the total weight of the catalyst (for example, 0.05 to 20 wt%, Based on the weight of Ti).
  • silica gel is added to the above sol, and the stirring temperature is 20 to 40 ° C, and the stirring time is 3 to 5 hours. Then drying at 70 ⁇ 150 °C for 8 ⁇ 15h; the dried product is calcined in a fluidized bed at a low temperature stage (for example, 100 ⁇ 300 °C) to remove the physics in the carrier in a nitrogen atmosphere.
  • a method for preparing the titanium dioxide modified inorganic carrier is as follows:
  • the obtained product is calcined at a high temperature of 300 to 900 ° C to obtain the titanium oxide-modified inorganic carrier.
  • the method comprises the steps of: i) dissolving the titanium compound in an organic solvent, and then adding an acid reflux reaction at a reflux temperature of 10 to 80 ° C, preferably 20 to 60 ° C. , the time is 3-7 hours, preferably 4-6 hours; the product after reflux is transferred to the configuration bottle, stirred by adding an inorganic carrier, stirring temperature 10 ⁇ 100 ° C, preferably 20 ⁇ 60 ° C, reaction time 2-10 h, Preferably it is 3 ⁇ 8 h. Then drying at 60-200 ° C, preferably 70-150 ° C, drying time 6 ⁇ 20h, preferably 8 ⁇ 15h, vacuum drying can also be used in the drying process;
  • the above sample is activated by high-temperature calcination in an inert gas or oxygen or air, and the calcination temperature is 300-900 ° C, preferably 400-800 ° C, the time is l ⁇ 10 h, preferably 4-6 h, and then cooled, wherein When it is cooled to 300 ⁇ 400 °C, it is switched to an inert gas such as nitrogen or argon, and it is naturally cooled.
  • the obtained titanium dioxide-modified inorganic carrier was transferred to a jar and placed in a desiccator for storage.
  • the above step i) is a reaction of a titanium compound with an inorganic carrier.
  • the titanium compound is the same as described above.
  • the organic solvent is selected from the group consisting of n-glycine, hexamethylene, cyclohexanthene and the like.
  • the inorganic acid is the same as above. Adjust the pH to 1 ⁇ 5, preferably 2 ⁇ 4.
  • the reflux reaction is carried out at a temperature of from 10 to 80 ° C, preferably from 20 to 60 ° C, for a period of from 3 to 7 hours, preferably from 4 to 6 hours.
  • the product after refluxing is transferred to a configuration bottle, stirred by an inorganic carrier, preferably continuously stirred, and the stirring temperature is 10 to 100 ° C, preferably 20 to 60 ° C, and the reaction time is 2 to 10 h, preferably 3 to 8 h.
  • the titanium loading is from 0.01 to 30% by weight, preferably from about 0.05 to 20% by weight, based on the total weight of the catalyst.
  • the product is also dried, and the drying step is first heated to 95 ° C until the precipitation occurs, and then dried in a blast drying oven; the drying temperature in the blast drying oven is 50-200 ° C, preferably 70 ⁇ 150 ° C, the time is 2 ⁇ 10 hours, preferably 3-6 hour.
  • the above step ii) is to calcine the dried titanium dioxide-modified inorganic carrier.
  • the manner of the calcination is not particularly limited, but the calcination is preferably carried out in a fluidized bed.
  • the calcination is usually carried out in two stages, a low temperature stage and a high temperature stage.
  • the low temperature stage is usually carried out at about 100 to 300 °C.
  • This high temperature stage is usually carried out at about 300 to 900 °C.
  • the physical water adsorbed in the carrier at the low temperature stage is substantially removed, and a part of the hydroxyl groups on the inorganic carrier are removed at the high temperature stage.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably under an inert gas atmosphere, such as an atmosphere of nitrogen, helium, argon or the like, preferably under a nitrogen atmosphere, for example High purity nitrogen.
  • the high temperature stage calcination is carried out under air or oxygen conditions, preferably under dry air conditions. After the completion of the calcination, the obtained inorganic carrier loaded with titanium oxide is cooled from a high temperature stage.
  • the atmosphere can be changed, for example, from air to an inert gas such as nitrogen, argon or the like, upon cooling to a temperature of 300 to 400 °C.
  • the cooling is natural cooling.
  • the obtained titanium oxide-modified inorganic carrier was transferred to a jar and placed in a desiccator for storage.
  • the specific operations for preparing the titanium dioxide-modified inorganic carrier of the present invention by the above method include:
  • Isopropyl titanate is dissolved in a solvent of n-hexane, wherein the titanium loading is in accordance with the requirements of the present invention (for example, 0.05 to 20 wt%, based on the weight of Ti), and then concentrated nitric acid is added to adjust the pH to 1 to 5
  • a reflux reaction is carried out at a temperature of 10 to 80 ° C, preferably 20 to 60 ° C, for a period of 3 to 7 hours, preferably 4 to 6 hours.
  • the product after refluxing is transferred to a configuration bottle, stirred by silica gel, and stirred at a temperature of 10 to 100 ° C, preferably 20 to 60 ° C, and a reaction time of 2 to 10 h, preferably 3 to 8 h.
  • the mixture is heated to 95 ° C until the precipitation occurs, and the obtained precipitate is placed in a blast drying oven at 70 to 150 ° C for 3 hours; the dried product is subjected to high temperature baking in a fluidized bed, wherein in the low temperature stage (for example, 100 ⁇ 300 ° C) to remove the physical water in the carrier by roasting in a nitrogen atmosphere, and to remove some of the hydroxyl groups on the surface of the inorganic carrier in a high temperature stage (for example, 300 ° C to 900 ° C) in a dry air.
  • the low temperature stage for example, 100 ⁇ 300 ° C
  • a high temperature stage for example, 300 ° C to 900 ° C
  • a process for the preparation of a titania-modified supported chromium vanadium double-site catalyst comprising the following steps: i) any of the steps of preparing a titanium oxide-modified inorganic carrier according to the above a method for preparing a titanium dioxide modified inorganic carrier;
  • step i) impregnating the titanium oxide-modified inorganic carrier obtained in the step i) with a solution containing vanadium, followed by drying, followed by firing at a high temperature of 300 to 900 ° C;
  • step ii) The product obtained in the step ii) is impregnated with a solution containing chromium, then dried, and then calcined and activated at a high temperature of 300 to 900 ° C to obtain the catalyst for storage.
  • the immersion time is l ⁇ 12h, preferably 4 ⁇ 8h, the immersion temperature is 10 ⁇ 80°C, preferably 20 ⁇ 70°C, then 90 ⁇ 250 Drying at °C, preferably 100 ⁇ 200°C, drying time 6 ⁇ 20h, preferably 8 ⁇ 15h, vacuum drying can also be used during drying;
  • the sample is activated by high temperature roasting in inert gas or oxygen or air, calcination temperature At 300-900 ° C, preferably 400-800 ° C, the time is l ⁇ 10 h, preferably 4-6 h, and then cooling, wherein when cooled to 300-400 ° C, switching to an inert gas such as nitrogen or argon, Natural cooling
  • the immersion time is l ⁇ 12h, preferably 4 ⁇ 8h
  • the immersion temperature is 10 ⁇ 80°C, preferably 15 ⁇ 60°C, then at 90 ⁇ Drying between 250 ° C, preferably 100 ⁇ 150 ° C, drying time 6 ⁇ 20h, preferably 8 ⁇ 15h, vacuum can also be used in the drying process
  • the above sample is activated in inert gas or oxygen or air, roasting temperature At 300 ⁇ 900 °C, preferably 400 ⁇ 800 °C
  • the time is l ⁇ 10h, preferably 3 ⁇ 8h, then cooling, and switching to inert gas such as nitrogen or argon when cooling to 300 ⁇ 400 °C, naturally After cooling, the catalyst was obtained for storage.
  • the above step i) is to prepare a titanium oxide-modified inorganic carrier according to any one of the above methods for preparing a titanium oxide-modified inorganic carrier.
  • Step ii) is to support the vanadium source on a titanium dioxide modified inorganic support such as the titanium dioxide modified inorganic support described above. Used to load the vanadium source
  • the method of modifying the titanium dioxide-modified inorganic support may be any known method of supporting vanadium on a support.
  • a method of supporting a vanadium source on a titanium dioxide modified inorganic support comprises impregnating the titanium dioxide modified inorganic support with a vanadium source solution.
  • agitation preferably continuous agitation
  • the stirring is carried out for about 1 to 12 hours, preferably about 4 to 8 hours, and the immersion temperature is 10 to 80 ° C, preferably 20 to 70 ° C.
  • the vanadium loading is from 0.01 to 10% by weight, preferably from about 0.05 to 5% by weight, based on the total weight of the catalyst.
  • the resulting titanium oxide-modified support impregnated with the vanadium component is then dried. The drying is usually carried out at room temperature to 25 CTC, preferably at about 90 to 250 ° C, more preferably at about 100 to 200 ° C. According to one embodiment, the drying is carried out at about 120 °C.
  • This drying can also be carried out under vacuum.
  • the drying time is not particularly limited, but the drying usually lasts for about 6 to 20 hours, preferably about 7 to 18 hours, and more preferably about 8 to 15 hours.
  • the titanium oxide-modified inorganic carrier containing the vanadium component is calcined.
  • the manner in which the calcination is carried out is not particularly limited, but the calcination is preferably carried out in a fluidized bed. According to one embodiment, the calcination is usually carried out in two stages, a low temperature stage and a high temperature stage.
  • the low temperature stage is usually carried out at about 100 to 300 °C.
  • This high temperature stage is usually carried out at about 300 to 900 °C.
  • the physical water adsorbed in the carrier at the low temperature stage is substantially removed, and a part of the hydroxyl groups on the inorganic carrier are removed at the high temperature stage.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably under an inert gas atmosphere, such as an atmosphere of nitrogen, helium, argon or the like, preferably under a nitrogen atmosphere, for example High purity nitrogen.
  • the high temperature stage calcination is carried out under air or oxygen conditions, preferably under dry air conditions.
  • the obtained vanadium-loaded catalyst precursor is cooled from a high temperature stage.
  • the atmosphere can be changed, for example, from air to an inert gas such as nitrogen, argon or the like, upon cooling to a temperature of 300 to 400 °C.
  • the cooling is natural cooling.
  • the above step iii) is to load an inorganic chromium source on the vanadium-loaded catalyst precursor prepared in the step ii).
  • the method for supporting the inorganic chromium source on the catalyst precursor may be any method known to those skilled in the art to support the chromium on the support, and for example, a conventionally known method for preparing a Phillips catalyst may be mentioned.
  • the chromium source can be the inorganic chromium source described above.
  • agitation preferably continuous agitation, can be carried out during the impregnation. Generally, the stirring lasts for about 1 to 12 hours. Preferably, it is about 4 to 8 hours.
  • the loading of chromium is from about 0.01 to 10% by weight, preferably from about 0.05 to 5% by weight, further preferably from about 0.1 to 3% by weight, based on the total weight of the catalyst.
  • the resulting sample was then dried.
  • the drying is usually carried out at a temperature of from about room temperature to 200 ° C; for example, from about 15 ° C to 25 CTC, preferably from about 9 CTC to 250 ° C, and more preferably from about 10 CTC to 20 CTC.
  • the drying is carried out at about 12 CTC.
  • the drying time is not particularly limited, but the drying usually lasts for about 6 to 20 hours, preferably about 7 to 18 hours, and more preferably about 8 to 15 hours.
  • the calcination is preferably carried out in a fluidized bed.
  • the calcination is usually carried out in two stages, a low temperature stage and a high temperature stage.
  • This low temperature stage is usually carried out at about 100 to 300 °C.
  • This high temperature stage is usually carried out at about 300 to 900 °C.
  • the physical water adsorbed in the carrier at the low temperature stage is removed, and part of the hydroxyl groups on the inorganic carrier are removed at the high temperature stage.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 8 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably under an inert gas, such as an atmosphere of nitrogen, helium, argon or the like, preferably under a nitrogen atmosphere, such as high purity. Nitrogen.
  • the high temperature stage calcination is carried out under air or oxygen conditions, preferably under dry air conditions. After the completion of the calcination, the obtained metal oxide-loaded titanium oxide-modified inorganic carrier is cooled from a high temperature stage.
  • the atmosphere when cooling to a temperature of 300 to 400 ° C after high-temperature baking, the atmosphere can be changed, for example, from air to an inert gas such as nitrogen or the like.
  • the cooling is natural cooling.
  • the obtained catalyst was stored under an inert gas atmosphere for use.
  • the specific operation of preparing the catalyst of the present invention comprises: preparing a titanium dioxide-modified inorganic carrier such as titanium dioxide-modified silica gel according to any one of the above methods for preparing a titanium oxide-modified inorganic carrier, wherein the titanium loading is relative to The total weight of the catalyst meets the requirements of the present invention (for example, 0.05-20% by weight, based on the weight of Ti); the obtained titanium dioxide modified silica gel is immersed in a certain concentration of ammonium metavanadate solution, and the vanadium loading is consistent with the total weight of the catalyst.
  • the requirements of the present invention for example, 0.1 to 10 wt%, based on the weight of vanadium); after continuous stirring for a certain period of time (for example, 4 to 8 hours), the temperature is dried; the carrier impregnated with ammonium metavanadate is subjected to a high temperature in a fluidized bed.
  • the inorganic chromium source is supported on the catalyst precursor prepared by the above method, and the chromium loading is consistent with the requirements herein (for example, 0.1 to 5 wt% of the total weight of the catalyst, based on the weight of chromium), and continuously stirred for a certain period of time (for example, 4)
  • the temperature is dried; then high temperature calcination is carried out in a fluidized bed, wherein the physical water adsorbed in the carrier is removed by calcination in a low temperature stage (for example, 10 CTC -300 ° C) in a high temperature stage (for example, 300 ° C ⁇ 900 ° C) in the dry air to remove some of the hydroxyl groups on the surface of the inorganic carrier, in this high temperature period for a certain period of time (for example, 3 to 8 hours); natural cooling and cooling, cooling to 300 ⁇ 400 ° C When it is switched to nitrogen protection, it is transferred under nitrogen protection, and the catalyst is saved for use.
  • the invention provides a preparation method of a titanium dioxide modified supported chromium vanadium metal oxide double active center catalyst comprising the following steps: i) preparing titanium dioxide modified according to any one of the above methods for preparing titanium dioxide modified inorganic carrier Inorganic carrier;
  • the product obtained by the product obtained in the step ii) is calcined and activated at a high temperature of 300 ° C to 900 ° C to obtain the catalyst for storage.
  • the method comprises the steps of:
  • the mixed salt solution containing chromium and vanadium is co-impregnated on the titanium dioxide-modified inorganic carrier obtained in the step i), the immersion time is l ⁇ 12h, preferably 4 ⁇ 8h, and the immersion temperature is 10 ⁇ 80°C, preferably 20-70 ° C, and then dried between 90 ⁇ 250 ° C, preferably 100 ⁇ 200 ° C, drying time 6 ⁇ 20h, preferably 8 ⁇ 15h, vacuum can also be used in the drying process;
  • the above sample is activated by high-temperature calcination in an inert gas or oxygen or air at a calcination temperature of 300 to 900 ° C, preferably 400 to 800 ° C, for a period of 1 to 10 h, preferably 3 to 8 h, and then cooled.
  • a calcination temperature 300 to 900 ° C, preferably 400 to 800 ° C, for a period of 1 to 10 h, preferably 3 to 8 h, and then cooled.
  • an inert gas such as nitrogen or argon
  • the above step ii) is a method of simultaneously immersing a chromium source and a vanadium source on a titanium oxide-modified inorganic carrier (the titanium oxide-modified inorganic carrier described above).
  • the source of chromium may be any of the sources of chromium described above
  • the source of vanadium may be any source of vanadium as described above.
  • heating agitation may be carried out, preferably continuous heating agitation.
  • the stirring is carried out for about 1 to 12 hours, preferably for about 4 to 8 hours, and the immersion temperature is 10 to 80 ° C, preferably 20 to 70 ° C.
  • the loading of chromium is from 0.01 to 10% by weight, preferably from 0.05 to 5% by weight based on the total weight of the catalyst; the vanadium loading is from 0.01 to 10% by weight, preferably from about 0.05 to 5% by weight, based on the total weight of the catalyst.
  • the resulting sample was then dried.
  • the drying is usually carried out at a temperature of from about room temperature to 25 CTC, preferably from 90 ° C to 250 ° C, more preferably from 100 ° C to 200 ° C.
  • the drying time is not particularly limited, but the drying usually lasts for about 6 to 20 hours, preferably about 7 to 18 hours, more preferably about 8 to 15 hours, and a vacuum may be used during the drying.
  • step iii) is after the drying is completed, the titanium oxide-modified support impregnated with the chromium and vanadium compounds is calcined, and finally the chromium vanadium oxide is supported on the surface of the support.
  • the manner in which the calcination is carried out is not particularly limited, but the calcination is preferably carried out in a fluidized bed. According to one embodiment, the calcination is typically carried out in two stages, a low temperature stage and a high temperature stage. This low temperature stage is usually carried out at about 100 to 300 °C. This high temperature stage is usually carried out at about 300 to 900 °C.
  • the physical water adsorbed in the carrier in the low temperature stage is removed, and a part of the hydroxyl groups on the carrier in the high temperature stage is removed.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours.
  • the high temperature phase lasts for 1 to 10 hours, preferably 2 to 9 hours, more preferably 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably under an inert gas, such as an atmosphere of nitrogen, helium, argon or the like, preferably under a nitrogen atmosphere, such as high purity. Nitrogen.
  • the high temperature stage calcination is carried out under air or oxygen conditions, preferably under dry air conditions.
  • the obtained metal oxide-loaded titanium oxide-modified inorganic carrier is cooled from a high temperature stage.
  • the atmosphere can be changed, for example, from air to an inert gas such as nitrogen, when cooled to a temperature of 300 to 400 ° C after high temperature calcination.
  • the cooling is natural cooling.
  • the obtained catalyst was stored under an inert gas atmosphere for use.
  • the specific operation of preparing the catalyst of the present invention comprises: preparing dioxane according to any of the above methods for preparing a titanium oxide-modified inorganic carrier.
  • a titanium-modified inorganic carrier such as titanium dioxide-modified silica gel, wherein the titanium loading is in accordance with the total weight of the catalyst (for example, 0.05 to 20% by weight, based on the weight of Ti); the obtained titanium dioxide-modified silica gel is immersed in In a certain concentration of ammonium metavanadate and basic chromium acetate solution, the loading of vanadium and chromium is in accordance with the total weight of the catalyst (for example, 0.1 to 10 wt% of vanadium, 0.1 to 3 wt% of chromium, and vanadium and chromium, respectively).
  • the temperature After being continuously stirred for a certain period of time (for example, 4 to 8 hours), the temperature is dried; then, high temperature baking is carried out in a fluidized bed, wherein in a low temperature stage (for example, 100 ° C to 300 ° C) in a nitrogen atmosphere
  • a low temperature stage for example, 100 ° C to 300 ° C
  • the physical water adsorbed in the carrier is removed by calcination, and is partially calcined in a dry air at a high temperature stage (for example, 300 ° C to 900 ° C) to remove a part of the hydroxyl groups on the surface of the inorganic carrier, and is kept at a high temperature for a certain period of time (for example, 3 to 8).
  • the invention provides a preparation method of a titanium dioxide modified supported chromium vanadium double active center catalyst comprising the following steps:
  • step i) impregnating the titanium oxide-modified inorganic carrier obtained in the step i) with a solution containing chromium, followed by drying, followed by firing at a high temperature of 300 ° C to 900 ° C;
  • step ii) The product obtained in the step ii) is impregnated with a solution containing vanadium, then dried, and then calcined and activated at a high temperature of 300 ° C to 900 ° C to obtain a catalyst for storage.
  • the method comprises the steps of:
  • the immersion time is 1 to 12 h, preferably 4 to 8 h, and the immersion temperature is 10 to 80 ° C, preferably 20 to 70 ° C.
  • drying at 90 ⁇ 250 °C, preferably 100 ⁇ 150 °C, drying time 6 ⁇ 20h, preferably 8 ⁇ 15h, vacuum can also be used in the drying process; the above sample is heated in inert gas or oxygen or air Calcination activation, calcination temperature is 300 ⁇ 900 °C, preferably 400 ⁇ 800 °C, time is l ⁇ 10h, preferably 3 ⁇ 8h, then cooled, and switched to inert gas such as nitrogen or cooled when cooled to 300 ⁇ 400 °C Argon gas, etc., naturally cooled to obtain a catalyst precursor loaded with chromium; Iii) impregnating the vanadium salt solution onto the chromium-supported catalyst precursor for a immersion time of 1 to 12 hours, preferably 3 to 8 hours, an immersion temperature of 10 to 80 ° C, preferably 20 to 70 ° C, and then 90 ° Drying between 250 ° C, preferably 100 ⁇ 150 ° C, drying time 6 ⁇ 20h, preferably 8 ⁇ 15h, vacuum can also
  • the above step i) is to prepare a titanium dioxide-modified inorganic carrier according to any one of the above methods for preparing a titanium oxide-modified inorganic carrier; the above step ii) is to load a chromium source on a titanium oxide-modified inorganic carrier (for example, The method of the titanium dioxide modified inorganic carrier).
  • the method for supporting the chromium source on the titanium oxide-modified inorganic carrier may be any method known to those skilled in the art for supporting chromium on a support, and for example, a conventionally known method for preparing a Phillips catalyst may be mentioned.
  • the source of chromium can be any of the sources of chromium described above.
  • agitation preferably continuous agitation
  • the agitation is for about 1 to 12 hours, preferably about 4 to 8 hours.
  • the loading of chromium is from about 0.01 to 10% by weight, preferably from about 0.05 to 5% by weight, further preferably from about 0.1 to 2% by weight, based on the total weight of the catalyst.
  • the resulting sample was then dried. The drying is usually carried out at a temperature of from about room temperature to 20 CTC; for example, from 15 ° C to 200 ° C, preferably from 2 CTC to 200 ° C, further preferably from 100 ° C to 200 ° C. According to one embodiment, the drying is carried out at about 12 CTC.
  • the drying time is not particularly limited, but the drying usually lasts for about 6 to 20 hours, preferably about 7 to 18 hours, and more preferably about 8 to 15 hours.
  • the chromium-containing titanium oxide-modified inorganic carrier is calcined.
  • the manner in which the calcination is carried out is not particularly limited, but the calcination is preferably carried out in a fluidized bed. According to one embodiment, the calcination is usually carried out in two stages, a low temperature stage and a high temperature stage. This low temperature stage is usually carried out at about 100 to 300 °C. This high temperature stage is usually carried out at about 300 ° C to 900 ° C.
  • the physical water adsorbed in the carrier at the low temperature stage is removed, and part of the hydroxyl groups on the inorganic carrier are removed at the high temperature stage.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably an inert gas gas, more preferably under a nitrogen atmosphere, such as high purity nitrogen.
  • the high temperature calcination stage is carried out in an inert gas or air, preferably dry air.
  • the obtained catalyst precursor loaded with chromium is cooled from a high temperature stage.
  • the atmosphere can be switched, for example, from air to an inert gas, such as nitrogen, when cooled to a temperature of 300 to 400 ° C after high temperature calcination.
  • the cooling is natural cooling.
  • the obtained catalyst precursor was stored in an inert gas atmosphere for use.
  • the above step iii) is to further support the vanadium source on the chromium-supported catalyst precursor prepared in the step ii).
  • the method for supporting the vanadium source on the catalyst precursor may be any known method of supporting vanadium on a support.
  • a method of supporting a vanadium source on a catalyst precursor comprises impregnating the catalyst precursor with a vanadium source solution.
  • the vanadium source can be any vanadium source as described above.
  • agitation preferably continuous agitation, can be carried out during the impregnation.
  • the stirring is carried out for about 1 to 12 hours, preferably for about 4 to 8 hours, and the immersion temperature is 10 to 80 ° C, preferably 20 to 70 ° C.
  • the vanadium loading is from 0.01 to 10% by weight, preferably from about 0.05 to 5% by weight, based on the total weight of the catalyst.
  • the resulting sample was then dried.
  • the drying is usually carried out at a temperature of from about room temperature to 20 CTC; for example, at about 15 to 200 ° C, preferably 20 to 200 ° C, and more preferably about 100 to 200 ° C.
  • the drying is carried out at about 12 CTC. This drying can also be carried out under vacuum.
  • the drying time is not particularly limited, but the drying usually lasts for about 6 to 20 hours, preferably about 7 to 18 hours, and more preferably about 8 to 15 hours.
  • the sample impregnated with the vanadium component is calcined.
  • the manner in which the calcination is carried out is not particularly limited, but the calcination is preferably carried out in a fluidized bed. According to one embodiment, the calcination is usually carried out in two stages, a low temperature stage and a high temperature stage.
  • the low temperature stage is usually carried out at about 100 to 300 °C.
  • This high temperature stage is usually carried out at about 300 to 900 °C.
  • the physical water adsorbed in the carrier is substantially removed during the low temperature phase, and a portion of the hydroxyl groups on the inorganic carrier are removed during the high temperature phase.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably under an inert gas atmosphere, such as the inert gas described above.
  • the high temperature stage calcination is carried out under air or oxygen conditions, preferably under dry air conditions.
  • the obtained supported metal oxide-supported carrier is cooled from a high temperature stage.
  • the atmosphere can be changed, for example, from air to an inert gas such as nitrogen, argon or the like, upon cooling to a temperature of 300 to 400 °C.
  • the cooling is a natural temperature-cooling cooling, and the catalyst is saved for storage.
  • the specific operation of preparing the catalyst of the present invention comprises: preparing a titanium dioxide-modified inorganic carrier such as titanium dioxide-modified silica gel according to any one of the above methods for preparing a titanium oxide-modified inorganic carrier, wherein the titanium loading is relative to The total weight of the catalyst meets the requirements of this document (for example, 0.05 to 20% by weight, based on the weight of Ti).
  • the prepared titanium dioxide modified silica gel is immersed in an aqueous solution of an inorganic chromium source, and the chromium loading is in accordance with the requirements of the present invention (for example, 0.1 to 2 wt% of the total weight of the catalyst, based on the weight of chromium), and continuously stirred for a certain period of time (for example, 3) After ⁇ 8 hours), the temperature is dried; then high temperature calcination is carried out in a fluidized bed, wherein the physical water adsorbed in the carrier is removed by calcination in a low temperature stage (for example, 10 CTC -300 ° C) in a high temperature stage (for example, 300 ° C ⁇ 900 ° C) in the dry air to remove some of the hydroxyl groups on the surface of the inorganic carrier, in this high temperature period for a certain period of time (for example, 3 to 8 hours); natural cooling and cooling, cooling to 300 ⁇ 400 ° C Switch to nitrogen protection, transfer under nitrogen protection, save for
  • the vanadium loading is in accordance with the requirements of this paper. (for example, 0.1 ⁇ 10wt%, based on the weight of vanadium); after continuous stirring for a certain period of time (for example, 4 ⁇ 8 hours), the temperature is dried; the obtained sample is carried out in a fluidized bed.
  • Warm roasting in which the low temperature stage (for example, 100 ° C ⁇ 300 ° C) is calcined in a nitrogen atmosphere to remove the physical water adsorbed in the carrier, and the high temperature stage (for example, 300 ° C ⁇ 900 ° C) is baked in dry air to remove the silica gel.
  • the invention provides a preparation method of a titanium dioxide modified supported chromium vanadium double active center catalyst comprising the following steps:
  • step i) The product obtained in the step i) is impregnated with a solution containing chromium, then dried, and then calcined and activated at a high temperature of 300 to 900 ° C to obtain the catalyst for storage.
  • the method comprises the steps of:
  • time is l ⁇ 10h, preferably 3 ⁇ 8h, then cooled, and switched to inert gas such as nitrogen or argon when cooled to 300 ⁇ 400 °C, naturally cooled , obtaining a catalyst precursor loaded with titanium and vanadium;
  • the immersion time is l ⁇ 12h, preferably 3-8h
  • the immersion temperature is 10 ⁇ 80°C, preferably 20 ⁇ 70°C
  • Drying between 90 ⁇ 250°C, preferably 100 ⁇ 150°C, drying time 6 ⁇ 20h, preferably 8 ⁇ 15h, vacuum can also be used in the drying process; the sample is activated by high temperature roasting in inert gas or oxygen or air.
  • the calcination temperature is 300-900 ° C, preferably 400-800 ° C, the time is l ⁇ 10 h, preferably 3-8 h, and then cooled, and switched to an inert gas such as nitrogen or argon when cooled to 300-400 ° C. Etc., naturally cooled, the catalyst is saved for later use.
  • the above step i) is a method of supporting titanium and vanadium on an inorganic carrier such as the inorganic carrier described above.
  • the source of titanium may be any of the sources of titanium described above, and the source of vanadium may be any source of vanadium as described above.
  • agitation preferably continuous agitation, can be carried out during the impregnation. Typically, the agitation is for about 1 to 12 hours, preferably about 4 to 8 hours.
  • the titanium loading is from 0.01 to 30% by weight, preferably from about 0.05 to 20% by weight based on the total weight of the catalyst ; the vanadium loading is from 0.01 to 10% by weight, preferably from about 0.05 to 5% by weight, based on the total weight of the catalyst.
  • the resulting sample was then dried.
  • the drying is usually carried out at a temperature of from about room temperature to 20 CTC; for example at 15 ° C to 20 CTC, preferably 20 ° (to 200 ° (and further preferably 100 ° C to 200 ° C. According to one embodiment, the drying is at about 120)
  • the drying time is not particularly limited, but the drying usually lasts for about 6 to 20 hours, preferably about 7 to 18 hours, more preferably about 8 to 15 hours.
  • titanium and vanadium are contained.
  • the carrier is calcined.
  • the manner in which the calcination is carried out is not particularly limited, but the calcination is preferably carried out in a fluidized bed.
  • the calcination is usually carried out in two stages, a low temperature stage and a high temperature stage. It is carried out at about 100 to 300 ° C.
  • the high temperature phase is usually carried out at about 30 CTC to 900 ° C.
  • the physical water adsorbed in the carrier at the low temperature stage is removed, and the inorganic carrier is adsorbed at the high temperature stage.
  • the partial hydroxyl group is removed.
  • the low temperature phase lasts for 1 to 10 hours, preferably 2 to 9 hours.
  • the high temperature The stage lasts for 1 to 10 hours, preferably 2 to 9 hours, more preferably 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably an inert gas gas, more preferably under a nitrogen atmosphere.
  • an inert gas gas for example, high purity nitrogen.
  • the high temperature roasting stage is inert It is carried out in gas or air, preferably dry air.
  • the obtained catalyst precursor supporting titanium and vanadium is cooled from a high temperature stage.
  • the atmosphere can be switched, for example, from air to an inert gas, such as nitrogen, when cooled to a temperature of 300 to 400 ° C after high temperature calcination.
  • the cooling is natural cooling.
  • the obtained catalyst precursor was stored in an inert gas atmosphere for use.
  • the above step ii) is to further load the chromium source on the catalyst precursor loaded with titanium and vanadium prepared in the step i).
  • the method for supporting the chromium source on the catalyst precursor may be any known method of supporting chromium on a support, and for example, a conventionally known method for preparing a Phillips catalyst may be mentioned.
  • a method of loading a chromium source onto a catalyst precursor preloaded with titanium and vanadium comprises impregnating the catalyst precursor with a chromium source solution.
  • the loading of chromium is from about 0.01 to 10% by weight, preferably from about 0.05 to 5% by weight, further preferably from about 0.1 to 2% by weight, based on the total weight of the catalyst.
  • agitation preferably continuous agitation, can be carried out during the impregnation. Generally, the stirring is carried out for about 1 to 12 hours, preferably for about 4 to 8 hours, and the immersion temperature is 10 to 80 ° C, preferably 20 to 70 ° C. The resulting support impregnated with the chromium component is then dried.
  • the drying is usually carried out at a temperature of from about room temperature to 20 CTC; for example, at about 15 to 200 ° C, preferably 20 to 200 ° C, and more preferably about 100 to 200 ° C. According to one embodiment, the drying is carried out at about 12 CTC. This drying can also be carried out under vacuum.
  • the drying time is not particularly limited, but the drying usually lasts for about 6 to 20 hours, preferably about 7 to 18 hours, and more preferably about 8 to 15 hours.
  • the sample impregnated with the chromium component is calcined.
  • the manner in which the calcination is carried out is not particularly limited, but the calcination is preferably carried out in a fluidized bed.
  • the calcination is usually carried out in two stages, a low temperature stage and a high temperature stage.
  • the low temperature stage is usually carried out at about 100 to 300 °C.
  • This high temperature stage is usually carried out at about 300 to 900 °C.
  • the physical water adsorbed in the carrier is substantially removed during the low temperature phase, and a portion of the hydroxyl groups on the inorganic carrier are removed during the high temperature phase.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably under an inert gas atmosphere, such as the inert gas described above.
  • the high temperature stage calcination is carried out under air or oxygen conditions, preferably under dry air conditions.
  • the obtained metal oxide-supported support is cooled from a high temperature stage.
  • the atmosphere can be changed, for example, from air to inert, when cooled to a temperature of 300 to 400 °C.
  • a gas such as nitrogen, argon or the like.
  • the cooling is a natural temperature-cooling cooling, and the catalyst is stored under an inert gas for use.
  • the specific operation for preparing the catalyst of the present invention comprises: immersing the silica gel in an aqueous solution containing titanium sulfate and vanadyl oxalate, the titanium loading amount being in accordance with the total weight of the catalyst (for example, 0.05 to 20% by weight, based on titanium)
  • the weight of vanadium is in accordance with the requirements of the present invention (for example, 0.1 to 10% by weight, based on the weight of vanadium), and the mixture is continuously stirred for a certain period of time (for example, 3 to 8 hours), and then dried at a temperature;
  • High temperature calcination in the bed wherein in the low temperature stage (for example, 100 ° C ⁇ 300 ° C) in a nitrogen atmosphere to remove the physical water adsorbed in the carrier, in the high temperature stage (for example, 300 ° C ⁇ 900 ° C) in the dry air
  • the middle roasting part of the hydroxyl groups on the surface of the carrier are removed, and the high temperature stage is
  • the obtained catalyst precursor After being stored for use, the obtained catalyst precursor is immersed in a certain concentration of an aqueous solution of basic chromium acetate, and the chromium loading is in accordance with the requirements of the present invention (for example It is 0.1 ⁇ 2wt% of the total weight of the catalyst, based on the weight of chromium; after continuous stirring for a certain period of time (for example, 4 ⁇ 8 hours), the temperature is dried; the obtained product is subjected to high temperature baking in a fluidized bed, wherein the low temperature stage ( For example, 100 ° C ⁇ 300 ° C) roasting in a nitrogen atmosphere to remove the physical water adsorbed in the carrier, high temperature stage (for example, 300 ° C ⁇ 900 ° C) in the dry air to remove part of the hydroxyl surface of the carrier surface, here Maintain high temperature for a certain period of time (for example, 3 ⁇ 8 hours); cool down naturally, switch to nitrogen protection when cooling to 300 ⁇ 400 °C, transfer under nitrogen protection, and obtain catalyst for
  • step i) The product obtained in the step i) is impregnated with a solution containing vanadium, then dried, and then calcined and activated at a high temperature of 300 to 900 ° C to obtain the catalyst for storage.
  • the method comprises the steps of:
  • the immersion time is l ⁇ 12h, preferably 4-8h
  • the immersion temperature is 10 ⁇ 80°C, preferably 20 ⁇ 70°C, then 90 ⁇ 250° Drying between C, preferably 100 ⁇ 150 V, drying time 6 ⁇ 20h, preferably 8 ⁇ 15h, vacuum can also be used in the drying process
  • High temperature calcination activation in inert gas or oxygen or air, calcination temperature is 300 ⁇ 900 °C, preferably 400 ⁇ 800 °C
  • time is l ⁇ 10h, preferably 3 ⁇ 8h, then cooled, cooled to 300 ⁇ 400 ° (time switch to an inert gas such as nitrogen or argon, natural cooling, transfer under nitrogen protection, to obtain a catalyst precursor loaded with titanium and chromium;
  • the immersion time is l ⁇ 12h, preferably 3-8h
  • the immersion temperature is 10 ⁇ 80°C, preferably 20 ⁇ 70°C
  • Drying between 90 ⁇ 250°C, preferably 100 ⁇ 150°C, drying time 6 ⁇ 20h, preferably 8 ⁇ 15h, vacuum can also be used in the drying process; the sample is activated by high temperature roasting in inert gas or oxygen or air.
  • the calcination temperature is 300-900 ° C, preferably 400-800 ° C, the time is l ⁇ 10 h, preferably 3-8 h, and then cooled, and switched to an inert gas such as nitrogen or argon when cooled to 300-400 ° C. Etc., natural cooling, transfer under nitrogen protection, the catalyst was saved for later use.
  • the above step i) is a method of supporting titanium and chromium on an inorganic carrier such as the inorganic carrier described above.
  • the source of titanium may be a source of titanium as described above, which may be the source of chromium described above.
  • the method for supporting the chromium source on the support may be any known method of supporting chromium on a support, and for example, a conventionally known method for preparing a Phillips catalyst may be mentioned.
  • agitation preferably continuous agitation, can be carried out during the impregnation. Generally, the agitation is for about 1 to 12 hours, preferably about 4 to 8 hours.
  • the titanium loading is from 0.01 to 30% by weight, preferably from about 0.05 to 20% by weight, based on the total weight of the catalyst; the loading of chromium is from about 0.01 to 10% by weight, preferably from about 0.05 to 5% by weight, based on the total weight of the catalyst.
  • the resulting support containing titanium and chromium is then dried, usually at a temperature of from about room temperature to 20 CTC; for example, from 15 ° C to 20 CTC, preferably from 2 CTC to 200 V, further preferably from 100 ° C to 200 ° C. According to one embodiment, the drying is carried out at about 12 CTC.
  • the drying time is not particularly limited, but the drying usually lasts for about 6 to 20 hours, preferably about 7 to 18 hours, and more preferably about 8 to 15 hours.
  • the inorganic carrier containing titanium and chromium is calcined.
  • the manner in which the calcination is carried out is not particularly limited, but the calcination is preferably carried out in a fluidized bed. According to one embodiment, the calcination is usually carried out in two stages, a low temperature stage and a high temperature stage. This low temperature stage is usually carried out at about 100 to 300 °C. This high temperature stage is usually carried out at about 300 ° C to 900 ° C.
  • the physical water adsorbed in the carrier at the low temperature stage is removed, and part of the hydroxyl groups on the inorganic carrier are removed at the high temperature stage.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low The temperature stage is carried out under an inert gas or air atmosphere, preferably an inert gas gas, more preferably under a nitrogen atmosphere, such as high purity nitrogen.
  • the high temperature calcination stage is carried out in an inert gas or air, preferably drying high purity air.
  • the obtained catalyst precursor supporting titanium and chromium is cooled from a high temperature stage.
  • the atmosphere can be switched, for example, from air to an inert gas, such as nitrogen, when cooled to a temperature of 300 to 400 ° C after high temperature calcination.
  • the cooling is natural cooling.
  • the obtained catalyst precursor loaded with titanium and chromium was stored in an inert gas atmosphere for use.
  • the above step ii) is to further support the vanadium source on the catalyst precursor loaded with titanium and chromium prepared in the step i).
  • the method for supporting the vanadium source to the catalyst precursor may be any known method of supporting vanadium on a support.
  • a method of supporting a source of vanadium on a catalyst precursor preloaded with titanium and chromium comprises impregnating the catalyst precursor with a vanadium source solution.
  • the vanadium loading is from 0.01 to 10% by weight, preferably from about 0.05 to 5% by weight, based on the total weight of the catalyst.
  • agitation preferably continuous agitation, can be carried out during the impregnation.
  • the stirring is carried out for about 1 to 12 hours, preferably for about 4 to 8 hours, and the immersion temperature is 10 to 80 ° C, preferably 20 to 70 ° C.
  • the resulting sample was then dried.
  • the drying is usually carried out at a temperature of from about room temperature to 20 CTC; for example, at about 15 to 200 ° C, preferably 20 to 200 ° C, and more preferably about 100 to 200 ° C.
  • the drying is carried out at about 12 CTC. This drying can also be carried out under vacuum.
  • the drying time is not particularly limited, but the drying usually lasts for about 6 to 20 hours, preferably about 7 to 18 hours, and more preferably about 8 to 15 hours. After the drying was completed, the obtained sample was baked.
  • the manner in which the calcination is carried out is not particularly limited, but the calcination is preferably carried out in a fluidized bed.
  • the calcination is usually carried out in two stages, a low temperature stage and a high temperature stage.
  • the low temperature stage is usually carried out at about 100 to 300 °C.
  • This high temperature stage is usually carried out at about 300 to 900 °C.
  • the physical water adsorbed in the carrier is substantially removed during the low temperature phase, and a portion of the hydroxyl groups on the inorganic carrier are removed during the high temperature phase.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably under an inert gas atmosphere, such as the inert gas described above.
  • the high temperature stage calcination is carried out under air or oxygen conditions, preferably under dry air conditions.
  • the obtained metal oxide-supported support is cooled from a high temperature stage.
  • the atmosphere can be changed, for example, from air to an inert gas such as nitrogen, argon or the like.
  • the cooling is a natural temperature-cooling cooling, and the catalyst is stored under an inert gas for use.
  • the specific operation of preparing the catalyst of the present invention comprises: immersing the silica gel in an aqueous solution containing titanium sulfate and chromium trioxide, and the titanium loading amount meets the requirements of the present invention with respect to the total weight of the catalyst (for example, 0.05 to 20 wt%, with titanium
  • the weight of chromium is in accordance with the requirements of this paper (for example, 0.1 ⁇ 2wt% of the total weight of the catalyst, based on the weight of chromium), after continuous stirring for a certain period of time (for example, 3 ⁇ 8 hours), the temperature is raised and dried; then in the fluidization High temperature calcination in the bed, wherein in the low temperature stage (for example, 100 ° C ⁇ 300 ° C) in a nitrogen atmosphere to remove the physical water adsorbed in the carrier, in the high temperature stage (for example, 300 ° C ⁇ 900 ° C) in the dry air In the middle roasting, part of the hydroxyl groups on the surface of the
  • the obtained catalyst precursor After being stored for use, the obtained catalyst precursor is immersed in a certain concentration of an aqueous solution of ammonium hexafluorovanadate, and the vanadium loading is relative to the total weight of the catalyst.
  • the requirements of the present invention for example, 0.1 to 10% by weight, based on the weight of vanadium
  • the temperature is dried; the obtained product is subjected to high temperature baking in a fluidized bed, wherein in the low temperature stage (for example, 100 ° C ⁇ 300 ° C) in a nitrogen atmosphere to remove the physical water adsorbed in the carrier, in the high temperature stage (for example, 300 ° C ⁇ 900 ° C) in the dry air to remove part of the hydroxyl surface of the carrier surface, in This high temperature phase is maintained for a certain period of time (for example, 3 to 8 hours); natural cooling is cooled, and when it is cooled to 300-400 ° C, it is switched to nitrogen protection, and transferred
  • step i) The product obtained in the step i) is calcined and activated at a high temperature of 300 to 900 ° C to obtain the catalyst for storage.
  • the method comprises the steps of:
  • the immersion time is l ⁇ 12h, preferably 4-8h
  • the immersion temperature is 10 ⁇ 80°C, preferably 20 ⁇ 70°C, then at 90 ⁇ Drying between 250 ° C, preferably 100 ⁇ 150 ° C, drying time 6 ⁇ 20h, preferably 8 ⁇ 15h, vacuum can also be used in the drying process
  • the temperature is 300-900 ° C, preferably 400-800 ° C
  • the time is l ⁇ 10 h, preferably 3-8 h, and then cooled, and switched to an inert gas such as nitrogen or argon when cooled to 300-400 ° C, Naturally cooled, transferred under nitrogen protection, and the catalyst was saved under nitrogen protection for use.
  • the above step i) is a method of simultaneously impregnating titanium, vanadium and chromium onto an inorganic carrier such as the inorganic carrier described above.
  • the source of titanium may be a source of titanium as described above
  • the source of vanadium may be a source of vanadium as described above, which may be a source of chromium as described above.
  • agitation preferably continuous agitation, can be carried out during the impregnation. Generally, the agitation is for about 1 to 12 hours, preferably about 4 to 8 hours.
  • the titanium loading is 0.01 to 30% by weight, preferably about 0.05 to 20% by weight based on the total weight of the catalyst; and the vanadium loading is 0.01 to 10 wt% per total weight of the catalyst. Preferably, it is about 0.05 ⁇ 5wt°/.
  • the chromium loading is 0.01 to 10% by weight, preferably about 0.05 to 5% by weight based on the total weight of the catalyst.
  • the resulting sample was then dried.
  • the drying is usually carried out at a temperature of from about room temperature to 20 CTC; for example, from 15 ° C to 20 CTC, preferably from 2 CTC to 200 ° C, further preferably from 100 ° C to 200 ° C. According to one embodiment, the drying is carried out at about 12 CTC.
  • the drying time is not particularly limited, but the drying usually lasts for about 6 to 20 hours, preferably about 7 to 18 hours, and more preferably about 8 to 15 hours.
  • the above step ii) is to calcine an inorganic carrier containing titanium, vanadium and chromium.
  • the method of calcining is not particularly limited, but the calcination is preferably carried out in a fluidized bed.
  • the firing is typically carried out in two stages, a low temperature stage and a high temperature stage.
  • This low temperature stage is usually carried out at about 100 to 300 °C.
  • This high temperature stage is usually carried out at about 300 ° C to 900 ° C.
  • the physical water adsorbed in the carrier at the low temperature stage is removed, and part of the hydroxyl groups on the inorganic carrier are removed at the high temperature stage.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably an inert gas gas, more preferably under a nitrogen atmosphere, such as high purity nitrogen.
  • the high temperature calcination stage is carried out in an inert gas or air, preferably high purity air. After the completion of the calcination, the obtained metal oxide-supported support is cooled from a high temperature stage.
  • the atmosphere can be switched, for example, from air to an inert gas such as nitrogen, when cooled to a temperature of 300 to 400 ° C after high temperature calcination.
  • the cooling is natural cooling down.
  • the obtained catalyst was stored in an inert gas atmosphere for use.
  • the specific operation of preparing the catalyst of the present invention comprises: impregnating silica gel in an aqueous solution containing titanium sulfate, vanadyl oxalate and chromium trioxide, titanium loading phase
  • the vanadium loading is in accordance with the total weight of the catalyst (for example, 0.1 to 10 wt%, based on the weight of vanadium), chromium loading.
  • the amount meets the requirements of this paper (for example, 0.1 ⁇ 2wt%, based on the weight of chromium), after continuous stirring for a certain period of time (for example, 3 ⁇ 8 hours), the temperature is dried; then the high temperature roasting is carried out in the fluidized bed, wherein the low temperature stage (for example) 100 ° C ⁇ 300 ° C) roasting in a nitrogen atmosphere to remove the physical water adsorbed in the carrier, high temperature stage (for example, 300 ° C ⁇ 900 ° C) in the dry air to remove part of the hydroxyl surface of the carrier surface, at this high temperature The stage is kept for a certain period of time (for example, 3 ⁇ 8 hours); natural cooling is cooled, and when it is cooled to 300 ⁇ 400 °C, it is switched to nitrogen protection, and transferred under nitrogen protection to obtain a catalyst for use.
  • the invention provides a preparation method of a titanium dioxide modified supported chromium vanadium double active center catalyst comprising the following steps:
  • a pre-reduction activation treatment is carried out by adding an organometallic cocatalyst to the prepared titanium dioxide-modified supported chromium-vanadium double-site catalyst, followed by drying and storage.
  • the above method is a pre-reduction activation treatment of the obtained titanium oxide-modified supported chromium-vanadium double-site catalyst.
  • Step i) is to prepare a titanium dioxide-modified supported chromium-vanadium double-site catalyst by any one of the above six methods
  • step ⁇ ) is to pre-reduction and activate the catalyst by adding an organometallic cocatalyst under an inert atmosphere.
  • the organometallic cocatalyst comprises an organoaluminum compound, an organolithium compound, an organoboron compound, or the like, any cocatalyst for olefin polymerization known to those skilled in the art or a combination thereof.
  • used as The organoaluminum compound of the cocatalyst may include tridecyl aluminum A1R3, dinonyl decyl aluminum oxide A1R20R, dinonyl aluminum halide A1R2X, aluminoxane, ethyl sesquiamine chloride, etc., wherein R is a fluorenyl group,
  • R is a fluorenyl group having 1 to 12 carbon atoms, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, n-pentyl, n-hexyl, n-heptyl, n-octyl , n-decyl, n-dodecyl, etc.
  • X is a halogen such as fluorine, chlorine, bromine and iodine, preferably chlorine.
  • the aluminoxane may include a reaction of all of the bismuth aluminum and water such as methylaluminum oxyhydroxide (MAO).
  • the organoaluminum compounds as the cocatalyst may be used singly or in combination of two or more kinds.
  • the aluminum compound may, for example, be triethyl aluminum, triisobutyl aluminum, diethyl aluminum ethoxide, diethyl aluminum dichloride, methyl aluminoxane or the like.
  • the aluminum/chromium molar ratio is between 0 and 1000, preferably between 0 and 100, more preferably 0. -50
  • the reduction activation treatment temperature is between room temperature - locrc, preferably between room temperature - 6 ° ° C, reduction activation treatment time
  • the reduction activation treatment is carried out by stirring, preferably continuous stirring, and after the treatment is completed, drying is carried out between 60 and 120 ° C for 2 to 8 hours, and drying is carried out under an inert gas atmosphere, for example,
  • the reaction is carried out under an atmosphere of nitrogen, helium, argon or the like, preferably under a nitrogen atmosphere, and the drying process can also be carried out under vacuum.
  • the obtained pre-reduced activated titanium dioxide-modified supported chromium-vanadium double-site catalyst was stored in an inert gas atmosphere for use.
  • the specific operation of preparing the catalyst of the present invention comprises: dissolving isopropyl titanate in n-hexane to form a solution, wherein the titanium loading is in accordance with the requirements of the present invention (for example, 0.05 to 20 wt%, Ti).
  • the weight of the solution is added to the above solution by silica gel impregnation, continuous stirring at room temperature for a certain period of time (for example, 4 to 8 hours), and then dried at 70 to 150 ° C for 8 to 15 hours; the dried product is in a fluidized bed.
  • Performing high-temperature calcination in which the physical water in the carrier is removed by calcination in a nitrogen atmosphere at a low temperature stage (for example, 100 to 300 ° C), and the carrier is calcined in a dry air at a high temperature stage (for example, 300 ° C to 900 ° C).
  • the partial hydroxyl group on the surface is kept at a high temperature for a certain period of time (for example, 3 to 8 hours); it is cooled by natural cooling, and is switched to nitrogen protection when cooled to 300-400 ° C to obtain the titanium dioxide-modified silica gel, and transferred to The jar is placed in a desiccator for storage.
  • the obtained titanium dioxide modified silica gel is immersed in a certain concentration of ammonium metavanadate solution, and the vanadium loading amount meets the requirements of the present invention with respect to the total weight of the catalyst (for example, 0.1 to 10 wt%, based on the weight of vanadium); After the time (for example, 4 to 8 hours), the temperature is dried; the titanium dioxide modified silica gel containing ammonium metavanadate is calcined in a fluidized bed at a low temperature stage (for example, 100 ° C to 300 ° C) in nitrogen.
  • a low temperature stage for example, 100 ° C to 300 ° C
  • roasting in the atmosphere to remove the physical water adsorbed in the carrier in the high temperature stage (for example, 300 ° C ⁇ 900 ° C) in dry air
  • the high temperature stage for example, 300 ° C ⁇ 900 ° C
  • the high temperature stage is maintained for a certain period of time (for example, 3 to 8 hours); the natural cooling is cooled, and the nitrogen is protected by cooling to 300 to 400 ° C to obtain a vanadium-loaded catalyst.
  • the high temperature stage for example, 300 ° C ⁇ 900 ° C
  • the inorganic chromium source is supported on the catalyst precursor prepared by the above method, and the chromium loading is in accordance with the requirements herein (for example, 0.1 to 3 wt% of the total weight of the catalyst, based on the weight of chromium), and continuously stirred for a certain period of time (for example, 3) After ⁇ 8 hours), the temperature is raised and dried; then high temperature baking is carried out in a fluidized bed, wherein in the low temperature stage (for example, 100 ° C ⁇ 300 ° C), the physical water adsorbed in the carrier is removed by roasting in a nitrogen atmosphere, at a high temperature stage.
  • the low temperature stage for example, 100 ° C ⁇ 300 ° C
  • the catalyst is pre-reduced and activated by adding triethylaluminum, the aluminum/chromium molar ratio is between 0 and 50, the treatment temperature is from room temperature to 6 CTC, continuous stirring is for 0.5 to 10 hours, and then between 60 and 120 °C.
  • Drying is carried out for 2 to 8 hours, and the drying is carried out under an inert gas atmosphere, for example, under an atmosphere of nitrogen, helium, argon or the like, preferably under a nitrogen atmosphere, and the drying process can also be carried out under vacuum.
  • the obtained pre-reduced activated titanium dioxide-modified supported chromium vanadium double-site catalyst is stored for use in an inert gas atmosphere.
  • a fluorine-modified inorganic carrier may be prepared, and then a chromium and vanadium active component may be further loaded to obtain a catalyst, wherein the fluorine-modified inorganic carrier is prepared as follows - i) dissolving the fluorine compound The solvent is mixed with an inorganic carrier to carry out a reaction, and the product is dried after the reaction;
  • the dried product is calcined at a high temperature of 200 to 900 ° C to obtain the fluorine-modified inorganic carrier.
  • the method comprises the following steps: - i) dissolving the fluorine compound in a solvent and then impregnating it on an inorganic carrier, the immersion time is from 1 to 12 h, preferably from 4 to 8 h, and the immersion temperature is 10 ⁇ 80 ° C, preferably 20 ⁇ 70 ° C, and then dried at 50 ⁇ 200 ° C, preferably 70 ⁇ 150 ° C, drying time 6 ⁇ 20h, preferably 8 ⁇ 15h, vacuum drying can also be used in the drying process;
  • the above sample is activated by high-temperature calcination in an inert gas or oxygen or air at a calcination temperature of 200 to 900 ° C, preferably 400 to 800 ° C, and a calcination time of 1 to 10 h, preferably 4 to 6 h, followed by cooling, wherein When it is cooled to 300 ⁇ 400 °C, it is switched to an inert gas such
  • a method of supporting a fluorine compound on an inorganic carrier comprises impregnating a porous inorganic carrier with a solution of a fluorine compound.
  • agitation preferably continuous agitation, can be carried out during the impregnation.
  • the stirring is carried out for about 1 to 12 hours, preferably about 4 to 8 hours, and the immersion temperature is 10 to 80 ° C, preferably 20 to 70 ° C.
  • the fluorine loading is from 0.01 to 10% by weight, preferably from 0.5 to 5% by weight, based on the total weight of the catalyst.
  • the obtained carrier impregnated with the fluorine compound is then dried.
  • the time for drying is not particularly limited, but the drying usually lasts for about 6 to 20 hours, preferably about 7 to 18 hours, and more preferably about 8 to 15 hours.
  • the drying temperature is from room temperature to 250 V, preferably from 50 to 200 ° C, further preferably from 70 to 150 ° C, and vacuum drying may also be employed during the drying process.
  • the above step ii) is to calcine the inorganic carrier impregnated with the fluorine compound.
  • the method of calcining is not particularly limited, but the calcination is preferably carried out in a fluidized bed.
  • the firing is typically carried out in two stages, a low temperature stage and a high temperature stage.
  • the low temperature stage is usually carried out at about 100 to 300 °C.
  • This high temperature stage is usually carried out at about 300 to 900 °C.
  • the physical water adsorbed in the carrier at the low temperature stage is substantially removed, and part of the hydroxyl groups on the inorganic carrier are removed at the high temperature stage.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably under an inert gas atmosphere, such as an atmosphere of nitrogen, helium, argon or the like, preferably under a nitrogen atmosphere, for example High purity nitrogen.
  • the high temperature stage calcination is carried out under air or oxygen conditions, preferably under dry air conditions. After the completion of the calcination, the obtained fluorine-containing inorganic carrier is cooled from a high temperature stage.
  • the atmosphere can be changed, for example, from air to inert gas, such as nitrogen, argon or the like, upon cooling to a temperature of 300 to 400 °C.
  • the cooling is natural cooling down.
  • the obtained fluorine-modified inorganic carrier was transferred to a jar and placed in a desiccator for storage.
  • the physical water in the carrier is removed by roasting in a nitrogen atmosphere, and is partially calcined in a dry air at a high temperature stage (for example, 300 ° C to 900 ° C) to remove a part of the hydroxyl groups on the surface of the carrier, and is kept at a high temperature for a certain period of time (for example, 3 ⁇ ) 8 hours); Natural cooling and cooling, switching to nitrogen protection when cooled to 300 ⁇ 400 °C, the fluorine-modified silica gel is obtained, transferred to a jar, and placed in a desiccator for storage.
  • a high temperature stage for example, 300 ° C to 900 ° C
  • the present invention provides the following process for preparing a fluorine-modified supported chromium-vanadium double-site catalyst, wherein a process comprises the following steps - i) according to the above process for preparing a fluorine-modified inorganic carrier a fluorine-modified inorganic carrier; ⁇ ) impregnating the fluorine-modified inorganic carrier obtained in the step i) with a solution containing vanadium, followed by drying, followed by firing at a high temperature of 300 to 900 ° C;
  • step ii) The product obtained in the step ii) is impregnated with a solution containing chromium, then dried, and then calcined and activated at a high temperature of 300 to 900 ° C to obtain the catalyst for storage.
  • the method comprises the steps of:
  • a fluorine-modified inorganic carrier i) preparing a fluorine-modified inorganic carrier according to the above-mentioned preparation of a fluorine-modified inorganic carrier; ⁇ ) impregnating a vanadium salt solution on a fluorine-modified inorganic carrier, the immersion time is l ⁇ 12h, preferably 4 ⁇ 8h, The immersion temperature is 10 to 80 ° C, preferably 20 to 70 ° C, and then dried at 90 to 250 ° C, preferably 100 to 200 ° C, and the drying time is 6 to 20 h, preferably 8 to 15 h, and can also be used in the drying process.
  • Vacuum drying the above sample is activated by high temperature roasting in an inert gas or oxygen or air, and the calcination temperature is 300-900 ° C, preferably 400-800 ° C, the time is l ⁇ 10 h, preferably 4-6 h, and then cooled. When it is cooled to 300 ⁇ 400 °C, it is switched to an inert gas such as nitrogen or argon, and is naturally cooled;
  • the immersion time is l ⁇ 12h, preferably 4 ⁇ 8h
  • the immersion temperature is 10 ⁇ 80°C, preferably 15 ⁇ 60°C, then at 90 ⁇ Drying between 250 ° C, preferably 100 ⁇ 150 ° C, drying time 6 ⁇ 20h, preferably 8 ⁇ 15h, vacuum can also be used in the drying process
  • the above sample is activated in inert gas or oxygen or air, roasting temperature At 300 ⁇ 900 °C, preferably 400 ⁇ 800 °C
  • the time is l ⁇ 10h, preferably 3 ⁇ 8h, then cooling, and switching to inert gas such as nitrogen or argon when cooling to 300 ⁇ 400 °C, naturally After cooling, the catalyst was obtained for storage.
  • the above step i) is to prepare a fluorine-modified inorganic carrier according to the above method for preparing a fluorine-modified inorganic carrier.
  • Step ⁇ ) is to support the vanadium source on a fluorine-modified inorganic carrier (such as the fluorine modification described above) On the inorganic carrier).
  • the method for supporting the vanadium source on the fluorine-modified inorganic support may be any known method of supporting vanadium on a support.
  • a method of supporting a vanadium source on a fluorine-modified inorganic support comprises impregnating the fluorine-modified inorganic support with a vanadium source solution.
  • agitation preferably continuous agitation
  • the agitation is for about 1 to 12 hours, preferably about 4 to 8 hours
  • the immersion temperature is 10 to 80 V, preferably 20 to 70 °C.
  • the vanadium loading is from 0.01 to 10% by weight, preferably from about 0.05 to 5% by weight, based on the total weight of the catalyst.
  • the resulting fluorine-modified support impregnated with the vanadium component is then dried. The drying is usually carried out at room temperature to 25 CTC, preferably at 90 to 250 ° C, more preferably at 100 to 200 ° C. According to one embodiment, the drying is carried out at about 12 CTC.
  • This drying can also be carried out under vacuum.
  • the drying time is not particularly limited, but the drying usually lasts for 6 to 20 hours, preferably 7 to 18 hours, and more preferably 8 to 15 hours.
  • the fluorine-modified inorganic carrier containing the vanadium component is calcined.
  • the manner in which the calcination is carried out is not particularly limited, but the calcination is preferably carried out in a fluidized bed. According to one embodiment, the calcination is usually carried out in two stages, a low temperature stage and a high temperature stage.
  • the low temperature stage is usually carried out at about 100 to 300 °C.
  • This high temperature stage is usually carried out at about 300 to 900 °C.
  • the physical water adsorbed in the carrier at the low temperature stage is substantially removed, and a part of the hydroxyl groups on the inorganic carrier are removed at the high temperature stage.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably under an inert gas atmosphere, such as an atmosphere of nitrogen, helium, argon or the like, preferably under a nitrogen atmosphere, for example High purity nitrogen.
  • the high temperature stage calcination is carried out under air or oxygen conditions, preferably under dry air conditions.
  • the obtained vanadium-loaded catalyst precursor is cooled from a high temperature stage.
  • the atmosphere can be changed, for example, from air to an inert gas such as nitrogen, argon or the like, upon cooling to a temperature of 300 to 400 °C.
  • the cooling is natural cooling.
  • the above step iii) is to load an inorganic chromium source on the vanadium-loaded catalyst precursor prepared in the step ii).
  • the method for supporting the inorganic chromium source on the catalyst precursor may be any method known to those skilled in the art to support the chromium on the support, and for example, a conventionally known method for preparing a Phillips catalyst may be mentioned.
  • the chromium source can be the inorganic chromium source described above.
  • agitation preferably continuous agitation, can be carried out during the impregnation. Generally, the stirring lasts for 1 to 12 hours. It is preferably 4 to 8 hours.
  • the loading of chromium is 0.01 to 10% by weight, preferably 0.05 to 5% by weight, and more preferably 0.1 to 3% by weight based on the total weight of the catalyst.
  • the resulting sample was then dried.
  • the drying is usually carried out at a temperature of from room temperature to 200 ° C; for example, from 15 ° C to 25 CTC, preferably from 90 to 250 ° C, and further preferably from 10 CTC to 200 ° C.
  • the drying is carried out at about 12 CTC.
  • the drying time is not particularly limited, but the drying usually lasts for 6 to 20 hours, preferably 7 to 18 hours, and more preferably 8 to 15 hours. After the drying was completed, the obtained sample was baked.
  • the manner in which the calcination is carried out is not particularly limited, but the calcination is preferably carried out in a fluidized bed.
  • the calcination is usually carried out in two stages, a low temperature stage and a high temperature stage.
  • This low temperature stage is usually carried out at 100 to 300 °C.
  • This high temperature stage is usually carried out at 300 to 900 °C.
  • the physical water adsorbed in the carrier at the low temperature stage is removed, and part of the hydroxyl groups on the inorganic carrier are removed at the high temperature stage.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 8 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably under an inert gas, such as an atmosphere of nitrogen, helium, argon or the like, preferably under a nitrogen atmosphere, such as high purity. Nitrogen.
  • the high temperature stage calcination is carried out under air or oxygen conditions, preferably under dry air conditions. After the completion of the calcination, the obtained metal oxide-supported fluorine-modified inorganic carrier is cooled from a high temperature stage.
  • the atmosphere when cooling to a temperature of 300 to 400 ° C after high-temperature baking, the atmosphere can be changed, for example, from air to an inert gas such as nitrogen or the like.
  • the cooling is natural cooling.
  • the obtained catalyst was stored under an inert gas atmosphere for use.
  • the specific operation of preparing the catalyst of the present invention comprises: preparing a fluorine-modified inorganic carrier such as fluorine-modified silica gel according to any one of the above methods for preparing a fluorine-modified inorganic carrier, wherein the fluorine loading is relative to The total weight of the catalyst meets the requirements herein (eg, 0.01 to 10 wt%, based on the weight of F).
  • the prepared fluorine-modified silica gel is immersed in an aqueous solution of ammonium metavanadate, and the vanadium loading amount meets the requirements of the present invention (for example, 0.1 to 2 wt% of the total weight of the catalyst, based on the weight of vanadium), and is continuously stirred for a certain period of time (for example) After 3 ⁇ 8 hours), the temperature is raised and dried; then high temperature baking is carried out in a fluidized bed, wherein in the low temperature stage (for example, 100 ° C ⁇ 300 ° C), the physical water adsorbed in the carrier is removed by roasting in a nitrogen atmosphere at a high temperature.
  • the low temperature stage for example, 100 ° C ⁇ 300 ° C
  • Stage for example, 300 ° C ⁇ 900 ° C in the dry air to remove some of the hydroxyl groups on the surface of the inorganic carrier, in this high temperature period for a certain period of time (for example, 3 to 8 hours); natural cooling and cooling, cooling to 300 ⁇ Switch to nitrogen protection at 400 ° C, under nitrogen protection Transfer, save for use, and then immerse the obtained vanadium-loaded catalyst precursor in a certain concentration of an aqueous solution of basic chromium acetate.
  • the chromium loading is in accordance with the total weight of the catalyst (for example,
  • the present invention provides a method for preparing a fluorine-modified supported chromium vanadium metal oxide dual active site catalyst comprising the following steps:
  • step ii) The product obtained in the step ii) is calcined and activated at a high temperature of 300 ° C to 900 ° C to obtain the catalyst for storage.
  • the method comprises the steps of:
  • the mixed salt solution containing chromium and vanadium is co-impregnated on the fluorine-modified inorganic carrier obtained in the step i), the immersion time is l ⁇ 12h, preferably 4 ⁇ 8h, and the immersion temperature is 10 ⁇ 80°C, preferably 20 ⁇ 70 V, then dry between 90 ⁇ 250 °C, preferably 100 ⁇ 200 °C, drying time 6 ⁇ 20h, preferably 8 ⁇ 15h, vacuum can also be used in the drying process;
  • the above sample is activated by high-temperature calcination in an inert gas or oxygen or air at a calcination temperature of 300 to 900 ° C, preferably 400 to 800 ° C, for a period of 1 to 10 h, preferably 3 to 8 h, and then cooled.
  • a calcination temperature 300 to 900 ° C, preferably 400 to 800 ° C, for a period of 1 to 10 h, preferably 3 to 8 h, and then cooled.
  • an inert gas such as nitrogen or argon
  • the above step i) is prepared according to any one of the above methods for preparing a fluorine-modified inorganic carrier.
  • a fluorine-modified inorganic carrier is a method of simultaneously immersing a chromium source and a vanadium source on a fluorine-modified inorganic carrier (the fluorine-modified inorganic carrier described above).
  • the source of chromium may be any of the sources of chromium described above, and the source of vanadium may be any source of vanadium as described above.
  • heating agitation may be carried out, preferably continuous heating agitation.
  • the stirring is carried out for about 1 to 12 hours, preferably for about 4 to 8 hours, and the immersion temperature is 10 to 80 ° C, preferably 20 to 70 ° C.
  • the loading of chromium is from 0.01 to 10% by weight, preferably from 0.05 to 5% by weight based on the total weight of the catalyst; the vanadium loading is from 0.01 to 10% by weight, preferably from about 0.05 to 5% by weight, based on the total weight of the catalyst.
  • the resulting sample was then dried.
  • the drying is usually carried out at a temperature of from room temperature to 25 CTC, preferably from 90 ° C to 250 ° C, more preferably from 100 ° C to 200 ° C.
  • the drying time is not particularly limited, but the drying is usually carried out for 6 to 20 hours, preferably 7 to 18 hours, further preferably 8 to 15 hours, and a vacuum may be employed during the drying.
  • step iii) is after the drying is completed, the fluorine-modified carrier impregnated with the chromium and vanadium compound is calcined, and finally the chromium vanadium oxide is supported on the surface of the carrier.
  • the manner in which the calcination is carried out is not particularly limited, but the calcination is preferably carried out in a fluidized bed. According to one embodiment, the calcination is typically carried out in two stages, a low temperature stage and a high temperature stage. This low temperature stage is usually carried out at 100 to 300 °C. This high temperature stage is usually carried out at 300 to 900 °C.
  • the physical water adsorbed in the carrier at the low temperature stage is removed, and a part of the hydroxyl groups on the carrier at the high temperature stage is removed.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours.
  • the high temperature phase lasts for 1 to 10 hours, preferably 2 to 9 hours, more preferably 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably under an inert gas, such as an atmosphere of nitrogen, helium, argon or the like, preferably under a nitrogen atmosphere, such as high purity. Nitrogen.
  • the high temperature stage calcination is carried out under air or oxygen conditions, preferably under dry air conditions.
  • the obtained metal oxide-loaded fluorine-modified inorganic carrier is cooled from a high temperature stage.
  • the atmosphere can be changed, for example, from air to inert gas, such as nitrogen, when cooled to a temperature of 300 to 400 ° C after high temperature calcination.
  • the cooling is natural cooling.
  • the obtained catalyst was stored under an inert gas atmosphere for use.
  • the specific operation of preparing the catalyst of the present invention comprises: preparing a fluorine-modified inorganic carrier such as fluorine-modified silica gel according to any one of the above methods for preparing a fluorine-modified inorganic carrier, wherein the fluorine loading is relative to The total weight of the catalyst meets the requirements of this document (for example, 0.01 to 10% by weight, based on the weight of F); the obtained fluorine-modified silica gel is immersed in a certain concentration.
  • a fluorine-modified inorganic carrier such as fluorine-modified silica gel according to any one of the above methods for preparing a fluorine-modified inorganic carrier, wherein the fluorine loading is relative to The total weight of the catalyst meets the requirements of this document (for example, 0.01 to 10% by weight, based on the weight of F); the obtained fluorine-modified silica gel is immersed in a certain concentration.
  • the loading of vanadium and chromium is consistent with the total weight of the catalyst (eg 0.1 to 10 wt% vanadium, 0.1 to 3 wt% chromium, based on the weight of vanadium and chromium, respectively).
  • the temperature is raised and dried; then, high temperature baking is carried out in a fluidized bed, wherein the removal is carried out in a low temperature stage (for example, 100 ° C to 300 ° C) in a nitrogen atmosphere.
  • the physical water adsorbed in the carrier is calcined in a dry air at a high temperature stage (for example, 300 ° C to 900 ° C) to remove a part of the hydroxyl groups on the surface of the inorganic carrier, and is maintained at a high temperature for a certain period of time (for example, 3 to 8 hours); It is naturally cooled and cooled. When it is cooled to 300 ⁇ 400 °C, it is switched to nitrogen protection. Under nitrogen protection, the catalyst is stored for use.
  • the invention provides a preparation method of a fluorine-modified supported chromium-vanadium double-site catalyst comprising the following steps:
  • step ii) The product obtained in the step ii) is impregnated with a solution containing vanadium, then dried, and then calcined and activated at a high temperature of 300 ° C to 900 ° C to obtain a catalyst for storage.
  • the method comprises the steps of:
  • the immersion time is l ⁇ 12h, preferably 4-8h, and the immersion temperature is 10 ⁇ 80°C, preferably 20 ⁇ 70°C.
  • drying between 90 ⁇ 250 °C, preferably 100 ⁇ 150 °C, drying time 6 ⁇ 20h, preferably 8 ⁇ 15h, vacuum can also be used in the drying process; the above sample is heated in inert gas or oxygen or air Calcination activation, calcination temperature is 300 ⁇ 900 °C, preferably 400 ⁇ 800 °C, time is l ⁇ 10h, preferably 3 ⁇ 8h, then cooled, and switched to inert gas such as nitrogen or cooled when cooled to 300 ⁇ 400 °C Argon gas, etc., naturally cooled to obtain a catalyst precursor loaded with chromium;
  • the above step i) is to prepare a fluorine-modified inorganic carrier according to any one of the above methods for preparing a fluorine-modified inorganic carrier; the above step ii) is to load a chromium source on a fluorine-modified inorganic carrier (for example, the above)
  • the method of the fluorine-modified inorganic carrier may be any method known to those skilled in the art to support the chromium on the support, and for example, a conventionally known method for preparing a Phillips catalyst may be mentioned.
  • the source of chromium can be any of the sources of chromium described above.
  • agitation preferably continuous agitation
  • the agitation is continued for 1 to 12 hours, preferably 4 to 8 hours.
  • the loading of chromium is from 0.01 to 10% by weight, preferably from 0.05 to 5% by weight, further preferably from 0.1 to 2% by weight, based on the total weight of the catalyst.
  • the resulting sample was then dried.
  • the drying is usually carried out at a temperature of from room temperature to 20 CTC; for example, from 15 ° C to 20 CTC, preferably from 2 CTC to 200 ° C, further preferably from 100 ° C to 200 ° C.
  • the drying is carried out at about 12 CTC.
  • the time for carrying out the drying is not particularly limited, but the drying usually lasts for 6 to 20 hours, preferably 7 to 18 hours, and more preferably 8 to 15 hours.
  • the fluorine-modified inorganic carrier containing chromium is calcined.
  • the manner in which the calcination is carried out is not particularly limited, but the calcination is preferably carried out in a fluidized bed. According to one embodiment, the calcination is usually carried out in two stages, a low temperature stage and a high temperature stage. This low temperature stage is usually carried out at 100 to 300 °C. This high temperature stage is usually carried out at 300 ° C to 900 ° C.
  • the physical water adsorbed in the carrier at the low temperature stage is removed, and part of the hydroxyl groups on the inorganic carrier are removed at the high temperature stage.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably an inert gas gas, more preferably under a nitrogen atmosphere, such as high purity nitrogen.
  • the high temperature calcination stage is carried out in an inert gas or air, preferably dry air.
  • the obtained catalyst precursor loaded with chromium is cooled from a high temperature stage.
  • the atmosphere can be switched, for example, from air to an inert gas, such as nitrogen, when cooled to a temperature of 300 to 400 ° C after high temperature calcination.
  • the cooling is a natural cooling cool down.
  • the obtained catalyst precursor was stored in an inert gas atmosphere for use.
  • the above step iii) is to further support the vanadium source on the chromium-supported catalyst precursor prepared in the step ii).
  • the method for supporting the vanadium source on the catalyst precursor may be any known method of loading vanadium on a support.
  • a method of supporting a vanadium source on a catalyst precursor comprises impregnating the catalyst precursor with a vanadium source solution.
  • the vanadium source can be any vanadium source as described above.
  • agitation preferably continuous agitation, can be carried out during the impregnation. Generally, the stirring is carried out for 1 to 12 hours, preferably 4 to 8 hours, and the immersion temperature is 10 to 80 ° C, preferably 20 to 70 ° C.
  • the vanadium loading is from 0.01 to 10% by weight, preferably from 0.05 to 5% by weight, based on the total weight of the catalyst.
  • the resulting sample was then dried.
  • the drying is usually carried out at a temperature of from room temperature to 20 CTC; for example, from 15 to 200 ° C, preferably from 20 to 200 ° C, more preferably from 100 to 200 ° C.
  • the drying is carried out at about 12 CTC. This drying can also be carried out under vacuum.
  • the drying time is not particularly limited, but the drying usually lasts for 6 to 20 hours, preferably 7 to 18 hours, and more preferably 8 to 15 hours. After the drying is completed, the sample impregnated with the vanadium component is calcined.
  • the manner in which the calcination is carried out is not particularly limited, but the calcination is preferably carried out in a fluidized bed.
  • the calcination is typically carried out in two stages, a low temperature stage and a high temperature stage.
  • the low temperature stage is usually carried out at 100 to 300 °C.
  • This high temperature stage is usually carried out at 300 to 900 °C.
  • the physical water adsorbed in the carrier is substantially removed during the low temperature phase, and a portion of the hydroxyl groups on the inorganic carrier are removed during the high temperature phase.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably under an inert gas atmosphere, such as the inert gas described above.
  • the high temperature stage calcination is carried out under air or oxygen conditions, preferably under dry air conditions. After the completion of the calcination, the obtained supported metal oxide-supported carrier was cooled from a high temperature stage.
  • the atmosphere can be changed, for example, from air to an inert gas such as nitrogen, argon or the like.
  • the cooling is naturally cooled and cooled to provide a catalyst for storage.
  • the specific operation of preparing the catalyst of the present invention comprises: preparing a fluorine-modified inorganic carrier such as fluorine-modified silica gel according to any one of the above methods for preparing a fluorine-modified inorganic carrier, wherein the fluorine loading is relative to The total weight of the catalyst meets the requirements herein (eg, 0.01 to 10 wt%, based on the weight of F).
  • the prepared fluorine-modified silica gel is immersed in inorganic chromium In the aqueous solution of the source, the chromium loading is in accordance with the requirements of the present invention (for example, 0.1 to 2 wt% of the total weight of the catalyst, based on the weight of chromium).
  • the temperature is raised and dried; High temperature calcination in the bed, wherein in the low temperature stage (for example, 100 ° C ⁇ 300 ° C) in a nitrogen atmosphere to remove the physical water adsorbed in the carrier, in the high temperature stage (for example, 300 ° C ⁇ 900 ° C) in the dry air
  • the middle roasting part of the hydroxyl groups on the surface of the inorganic carrier are removed, and the temperature is maintained for a certain period of time (for example, 3 to 8 hours); the natural cooling is cooled, and the nitrogen is switched to the nitrogen protection when cooled to 300 to 400 ° C, and transferred under nitrogen protection.
  • the obtained catalyst precursor loaded with chromium is immersed in a certain concentration of ammonium metavanadate solution, and the vanadium loading amount meets the requirements of the present invention with respect to the total weight of the catalyst (for example, 0.1 to 10 wt%, based on the weight of vanadium
  • the temperature is dried; the obtained sample is subjected to high temperature baking in a fluidized bed, wherein the low temperature stage (for example, 100 ° C to 300 ° C)
  • the physical water adsorbed in the carrier is removed by roasting in a nitrogen atmosphere, and is removed in a dry air at a high temperature stage (for example, 300 ° C to 900 ° C) to remove a part of the hydroxyl groups on the surface of the silica gel, and is kept at a high temperature for a certain period of time (for example, 3 to 8).
  • the invention provides a preparation method of a fluorine-modified supported chromium-vanadium double-site catalyst comprising the following steps:
  • step i) The product obtained in the step i) is impregnated with a solution containing chromium, then dried, and then calcined and activated at a high temperature of 300 to 900 ° C to obtain the catalyst for storage.
  • the method comprises the steps of:
  • the immersion time is l ⁇ 12h, preferably 4-8h
  • the immersion temperature is 10 ⁇ 80°C, preferably 20 ⁇ 70°C, then 90 ⁇ 250° Drying between C, preferably 100 ⁇ 150 ° C, drying time 6 ⁇ 20h, preferably 8 ⁇ 15h, vacuum can also be used in the drying process
  • the above sample is activated by high temperature roasting in inert gas or oxygen or air
  • the calcination temperature is 300-900 °C, preferably 400 ⁇ 800 °C
  • time is l ⁇ 10h, preferably 3 ⁇ 8h, then cooled, and switched to inert gas such as nitrogen or argon when cooled to 300 ⁇ 400 °C, naturally cooled , obtaining a catalyst precursor loaded with fluorine and vanadium
  • the immersion time is l ⁇ 12h
  • the calcination temperature is 300-900 ° C, preferably 400-800 ° C, the time is l ⁇ 10 h, preferably 3-8 h, and then cooled, and switched to an inert gas such as nitrogen or argon when cooled to 300-400 ° C. Etc., naturally cooled, the catalyst is saved for later use.
  • the above step i) is a method of supporting fluorine and vanadium on an inorganic carrier such as the inorganic carrier described above.
  • the source of fluorine may be any of the sources of fluorine described above, and the source of vanadium may be any source of vanadium as described above.
  • agitation preferably continuous agitation, can be carried out during the impregnation. Generally, the agitation is continued for 1 to 12 hours, preferably 4 to 8 hours.
  • the fluorine loading is from 0.01 to 10% by weight, preferably from 0.5 to 2% by weight based on the total weight of the catalyst; the vanadium loading is from 0.01 to 10% by weight, preferably from 0.05 to 5% by weight, based on the total weight of the catalyst.
  • the resulting sample was then dried.
  • the drying is usually carried out at a temperature of from room temperature to 20 CTC; for example, from 15 ° C to 20 CTC, preferably from 2 CTC to 20 CTC, further preferably from 100 ° C to 200 ° C. According to one embodiment, the drying is carried out at about 12 CTC.
  • the drying time is not particularly limited, but the drying usually lasts for 6 to 20 hours, preferably 7 to 18 hours, and more preferably 8 to 15 hours.
  • the carrier containing fluorine and vanadium is calcined.
  • the manner in which the calcination is carried out is not particularly limited, but the calcination is preferably carried out in a fluidized bed.
  • the calcination is usually carried out in two stages, a low temperature stage and a high temperature stage.
  • This low temperature stage is usually carried out at 100 to 300 °C.
  • This high temperature stage is usually carried out at 300 ° C to 900 ° C.
  • the physical water adsorbed in the carrier at the low temperature stage is removed, and part of the hydroxyl groups on the inorganic carrier are removed at the high temperature stage.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably an inert gas gas, more preferably under a nitrogen atmosphere, such as high purity nitrogen.
  • the high temperature calcination stage is carried out in an inert gas or air, preferably dry air. After the completion of the calcination, the obtained catalyst precursor supporting fluorine and vanadium is cooled from a high temperature stage.
  • the atmosphere can be switched, for example, from air to an inert gas, such as nitrogen, when cooled to a temperature of 300 to 400 ° C after high temperature calcination.
  • the cooling is natural cooling.
  • the obtained catalyst precursor was stored in an inert gas atmosphere for use.
  • the above step ii) is to further support the chromium source on the catalyst precursor loaded with fluorine and vanadium prepared in the step i).
  • the method for supporting the chromium source on the catalyst precursor may be any known method of supporting chromium on a support, and for example, a conventionally known method for preparing a Phillips catalyst may be mentioned.
  • a method of supporting a chromium source on a catalyst precursor preloaded with fluorine and vanadium comprises impregnating the catalyst precursor with a solution containing chromium.
  • the loading of chromium is from 0.01 to 10% by weight, preferably from 0.05 to 5% by weight, further preferably from 0.1 to 2% by weight, based on the total weight of the catalyst.
  • agitation preferably continuous agitation, can be carried out during the impregnation. Generally, the stirring is carried out for 1 to 12 hours, preferably 4 to 8 hours, and the immersion temperature is 10 to 80 ° C, preferably 20 to 70 ° C.
  • the obtained catalyst precursor impregnated with the chromium component is then dried.
  • the drying is usually carried out at a temperature of from room temperature to 20 CTC; for example, from 15 to 200 ° C, preferably from 20 to 200 ° C, more preferably from 100 to 200 ° C. According to one embodiment, the drying is carried out at about 12 CTC. This drying can also be carried out under vacuum.
  • the drying time is not particularly limited, but the drying usually lasts for 6 to 20 hours, preferably 7 to 18 hours, and more preferably 8 to 15 hours.
  • the sample impregnated with the chromium component is calcined.
  • the manner in which the calcination is carried out is not particularly limited, but the calcination is preferably carried out in a fluidized bed.
  • the calcination is usually carried out in two stages, a low temperature stage and a high temperature stage.
  • the low temperature stage is usually carried out at 100 to 300 °C.
  • This high temperature stage is usually carried out at 300 to 900 °C.
  • the physical water adsorbed in the carrier is substantially removed during the low temperature phase, and a portion of the hydroxyl groups on the inorganic carrier are removed during the high temperature phase.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably under an inert gas atmosphere, such as the inert gas described above.
  • the high temperature stage calcination is carried out under air or oxygen conditions, preferably under dry air conditions.
  • the obtained metal oxide-supported support is cooled from a high temperature stage.
  • the atmosphere can be changed, for example, from air to inert gas, such as nitrogen, argon, etc., upon cooling to a temperature of 300 to 400 °C.
  • the cooling is a natural temperature-cooling cooling, and the catalyst is stored under an inert gas for use.
  • the specific operation of preparing the catalyst of the present invention comprises: immersing the silica gel in an aqueous solution containing ammonium hexafluorosilicate and vanadyl oxalate, and the fluorine loading is in accordance with the requirements of the present invention (for example, 0.01 to 10% by weight, based on the total weight of the catalyst).
  • the vanadium loading is in accordance with the total weight of the catalyst (eg 0.1 to 10 wt%, based on the weight of vanadium), continuously stirred After mixing for a certain period of time (for example, 3 to 8 hours), the temperature is raised and dried; then, high temperature baking is carried out in a fluidized bed, wherein in the low temperature stage (for example, 100 ° C to 300 ° C), the carrier is adsorbed in a nitrogen atmosphere to remove the adsorption in the carrier.
  • the low temperature stage for example, 100 ° C to 300 ° C
  • the chromium loading meets the requirements of this paper ( For example, 0.1 to 2 wt% of the total weight of the catalyst, based on the weight of chromium; after continuous stirring for a certain period of time (for example, 4 to 8 hours), the temperature is dried; the obtained product is subjected to high temperature roasting in a fluidized bed, wherein the low temperature stage (for example, 100 ° C ⁇ 300 ° C) roasting in a nitrogen atmosphere to remove the physical water adsorbed in the carrier, high temperature stage (for example, 300 ° C ⁇ 900 ° C) in the dry air to remove the surface of the carrier Hydroxy, maintained at this temperature stage predetermined time (e.g.
  • the invention provides a preparation method of a fluorine-modified supported chromium-vanadium double-site catalyst comprising the following steps:
  • step i) The product obtained in the step i) is impregnated with a solution containing vanadium, then dried, and then calcined and activated at a high temperature of 300 to 900 ° C to obtain the catalyst for storage.
  • the method comprises the steps of:
  • the immersion time is l ⁇ 12h, preferably 4-8h
  • the immersion temperature is 10 ⁇ 80°C, preferably 20 ⁇ 70°C, then 90 ⁇ 250° Drying between C, preferably 100 ⁇ 150 V, drying time 6 ⁇ 20h, preferably 8 ⁇ 15h, vacuum can also be used in the drying process
  • the sample is activated by high temperature roasting in inert gas or oxygen or air
  • the calcination temperature is 300 ⁇ 900 ° C, preferably 400 ⁇ 800 ° C
  • time is l ⁇ 10h, preferably 3 ⁇ 8h, and then cooled, when cooled to 300 ⁇ 400 ° (when switched to an inert gas such as nitrogen or argon, etc., naturally cooled, Transfer under nitrogen protection to obtain a catalyst precursor loaded with fluorine and chromium;
  • the immersion time is l ⁇ 12h, preferably 3-8h
  • the immersion temperature is 10 ⁇ 80°C, preferably 20 ⁇ 70°C, and then 90 ⁇ 250°C Inter-drying, preferably 100 ⁇ 150°C, drying time 6 ⁇ 20h, preferably 8 ⁇ 15h, vacuum can also be used in the drying process
  • the sample is activated by high temperature roasting in inert gas or oxygen or air
  • the calcination temperature is 300 ⁇ 900 ° C, preferably 400 ⁇ 800 ° C
  • time is l ⁇ 10h, preferably 3 ⁇ 8h, and then cooled, when cooled to 300 ⁇ 400 ° C switch to an inert gas such as nitrogen or argon, etc., naturally cooled, in Transfer under nitrogen to obtain the catalyst for storage.
  • the above step i) is a method of supporting fluorine and chromium on an inorganic carrier such as the inorganic carrier described above.
  • the source of fluorine may be a source of fluorine as described above, which may be the source of chromium described above.
  • the method for supporting the chromium source on the support may be any known method of supporting chromium on a support, and for example, a conventionally known method for preparing a Phillips catalyst may be mentioned.
  • agitation preferably continuous agitation, can be carried out during the impregnation. Generally, the agitation is for 1 to 12 hours, preferably 4 to 8 hours.
  • the fluorine loading is from 0.01 to 10% by weight, preferably from 0.5 to 2% by weight based on the total weight of the catalyst; the loading of chromium is from 0.01 to 10% by weight, preferably from 0.05 to 5% by weight, based on the total weight of the catalyst.
  • the resulting carrier containing fluorine and chromium is then dried, usually at a temperature of from room temperature to 20 CTC; for example, from 15 ° C to 20 CTC, preferably from 2 CTC to 20 CTC, further preferably from 100 ° C to 200 ° C. According to one embodiment, the drying is carried out at about 12 CTC.
  • the drying time is not particularly limited, but the drying usually lasts for 6 to 20 hours, preferably 7 to 18 hours, and more preferably 8 to 15 hours.
  • the inorganic carrier containing fluorine and chromium is calcined.
  • the manner in which the calcination is carried out is not particularly limited, but the calcination is preferably carried out in a fluidized bed. According to one embodiment, the calcination is usually carried out in two stages, a low temperature stage and a high temperature stage. This low temperature stage is usually carried out at 100 to 300 °C. This high temperature stage is usually carried out at 300 ° C to 900 ° C.
  • the physical water adsorbed in the carrier at the low temperature stage is removed, and part of the hydroxyl groups on the inorganic carrier are removed at the high temperature stage.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably an inert gas gas, more preferably under a nitrogen atmosphere, such as high purity nitrogen.
  • the high temperature calcination stage is carried out in an inert gas or air, preferably drying high purity air.
  • the obtained catalyst precursor supporting fluorine and chromium is cooled from a high temperature stage.
  • the atmosphere can be switched, for example, from air to an inert gas, such as nitrogen, when cooled to a temperature of 300 to 400 ° C after high temperature calcination.
  • the cooling is natural cooling.
  • the above step ii) is to further load the vanadium source on the catalyst precursor loaded with fluorine and chromium prepared in the step i).
  • the method for supporting the vanadium source to the catalyst precursor may be any known method of supporting vanadium on a support.
  • a method of supporting a vanadium source on a catalyst precursor previously loaded with fluorine and chromium comprises impregnating the catalyst precursor with a vanadium source solution.
  • the vanadium loading is from 0.01 to 10% by weight, preferably from 0.05 to 5% by weight, based on the total weight of the catalyst.
  • agitation preferably continuous agitation, may be carried out during the impregnation.
  • the stirring is carried out for 1 to 12 hours, preferably 4 to 8 hours, and the immersion temperature is 10 to 80 ° C, preferably 20 to 70 ° C.
  • the obtained sample was then dried.
  • the drying is usually carried out at a temperature of from room temperature to 20 CTC; for example, from 15 to 200 ° C, preferably from 20 to 200 ° C, more preferably from 100 to 200 ° C. According to one embodiment, the drying is carried out at about 12 CTC. This drying can also be carried out under vacuum.
  • the drying time is not particularly limited, but the drying usually lasts for 6 to 20 hours, preferably 7 to 18 hours, more preferably 8 to 15 hours. After the drying was completed, the obtained sample was baked.
  • the manner in which the calcination is carried out is not particularly limited, but the calcination is preferably carried out in a fluidized bed.
  • the calcination is typically carried out in two stages, a low temperature stage and a high temperature stage.
  • the low temperature stage is usually carried out at 100 to 300 °C.
  • This high temperature stage is usually carried out at 300 to 900 °C.
  • the physical water adsorbed in the carrier is substantially removed at the low temperature stage, and a part of the hydroxyl groups on the inorganic carrier are removed at the high temperature stage.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably under an inert gas atmosphere, such as the inert gas described above.
  • the high temperature stage calcination is carried out under air or oxygen conditions, preferably under dry air conditions. After the completion of the calcination, the obtained metal oxide-supported support is cooled from a high temperature stage.
  • the atmosphere can be changed, for example, from air to an inert gas such as nitrogen, argon or the like, upon cooling to a temperature of 300 to 400 °C.
  • the cooling is a natural temperature-cooling cooling, and the catalyst is stored under an inert gas for use.
  • the specific operation of preparing the catalyst of the present invention comprises: immersing the silica gel in an aqueous solution containing ammonium fluoride and chromium trioxide, and the fluorine loading amount meets the requirements of the present invention with respect to the total weight of the catalyst (for example, 0.01 to 10 wt%, with fluorine
  • the weight of the chromium, according to the requirements of this article for example, 0.1 ⁇ 2wt% of the total weight of the catalyst, based on the weight of chromium
  • continuous stirring After the time (for example, 3 to 8 hours), the temperature is dried; then, the high temperature baking is carried out in a fluidized bed, wherein the physical water adsorbed in the carrier is removed by roasting in a nitrogen atmosphere in a low temperature stage (for example, 100 ° C to 300 ° C).
  • the high temperature stage for example, 300 ° C ⁇ 900 ° C
  • this high temperature period for a certain period of time (for example, 3 to 8 hours); natural cooling, cooling to Switching to nitrogen protection at 300 ⁇ 400 °C, transferring under nitrogen protection, saving for use, and then immersing the obtained catalyst precursor in a certain concentration of aqueous solution of vanadyl oxalate.
  • the vanadium loading is consistent with the total weight of the catalyst.
  • Requires for example, 0.1 to 10% by weight, based on the weight of vanadium
  • the temperature is dried; the obtained product is subjected to high temperature baking in a fluidized bed, wherein in a low temperature stage (for example) 100 ° C ⁇ 300 ° C) roasting in a nitrogen atmosphere to remove the physical water adsorbed in the carrier, in the high temperature stage (for example, 300 ° C ⁇ 900 ° C) in the dry air to remove some of the hydroxyl surface of the carrier surface
  • a certain period of time for example, 3 ⁇ 8 hours
  • the invention provides a preparation method of a fluorine-modified supported chromium-vanadium double-site catalyst comprising the following steps:
  • step i) The product obtained in the step i) is calcined and activated at a high temperature of 300 to 900 ° C to obtain the catalyst for storage.
  • the method comprises the steps of:
  • the immersion time is l ⁇ 12h, preferably 4-8h
  • the immersion temperature is 10 ⁇ 80°C, preferably 20 ⁇ 70°C, then at 90 ⁇ Drying between 250 ° C, preferably 100 ⁇ 150 ° C, drying time 6 ⁇ 20h, preferably 8 ⁇ 15h, vacuum can also be used in the drying process
  • the calcination temperature is 300-900 ° C, preferably 400-800 ° C
  • the time is l ⁇ 10 h, preferably 3-8 h, and then cooled, and switched to an inert gas such as nitrogen or argon when cooled to 300-400 ° C.
  • an inert gas such as nitrogen or argon
  • the above step i) is a method of simultaneously immersing fluorine, vanadium and chromium on an inorganic carrier such as the inorganic carrier described above.
  • the source of fluorine may be a source of fluorine as described above
  • the source of vanadium may be a source of vanadium as described above, which may be a source of chromium as described above.
  • Stirring can be carried out, preferably with continuous stirring. Generally, the agitation is continued for 1 to 12 hours, preferably 4 to 8 hours.
  • the fluorine loading is 0.01 to 10% by weight, preferably 0.5 to 2% by weight of the total weight of the catalyst; the vanadium loading is 0.01 to 10% by weight, preferably 0.05 to 5% by weight based on the total weight of the catalyst; The total weight is 0.01 to 10% by weight, preferably 0.05 to 5% by weight.
  • the resulting sample was then dried.
  • the drying is usually carried out at a temperature of from room temperature to 20 CTC; for example, from 15 ° C to 20 CTC, preferably from 2 CTC to 200 ° C, further preferably from 100 ° C to 200 ° C. According to one embodiment, the drying is carried out at about 12 CTC.
  • the drying time is not particularly limited, but the drying usually lasts for 6 to 20 hours, preferably 7 to 18 hours, and more preferably 8 to 15 hours.
  • the above step ii) is to calcine an inorganic carrier containing fluorine, vanadium and chromium.
  • the method of calcining is not particularly limited, but the calcination is preferably carried out in a fluidized bed.
  • the firing is typically carried out in two stages, a low temperature stage and a high temperature stage.
  • This low temperature stage is usually carried out at 100 to 300 °C.
  • This high temperature stage is usually carried out at 300 ° C to 900 ° C.
  • the physical water adsorbed in the carrier at the low temperature stage is removed, and a part of the hydroxyl groups on the inorganic carrier are removed at the high temperature stage.
  • the low temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours.
  • the high temperature phase lasts from 1 to 10 hours, preferably from 2 to 9 hours, more preferably from 3 to 8 hours.
  • the low temperature stage is carried out under an inert gas or air atmosphere, preferably an inert gas gas, more preferably under a nitrogen atmosphere, such as high purity nitrogen.
  • the high temperature calcination stage is carried out in an inert gas or air, preferably high purity air. After the completion of the calcination, the obtained metal oxide-supported support is cooled from a high temperature stage.
  • the atmosphere can be switched, for example, from air to an inert gas such as nitrogen, when cooled to a temperature of 300 to 400 ° C after high temperature calcination.
  • the cooling is natural cooling down.
  • the obtained catalyst was stored in an inert gas atmosphere for use.
  • the specific operation of preparing the catalyst of the present invention comprises: immersing the silica gel in an aqueous solution containing ammonium fluoride, vanadyl oxalate and chromium trioxide, and the fluorine loading amount meets the requirements of the present invention with respect to the total weight of the catalyst (for example, 0.05 to 10 wt.
  • the vanadium loading is in accordance with the total weight of the catalyst (for example, 0.1 to 10 wt%, based on the weight of vanadium), and the chromium loading is in accordance with the requirements of this document (for example, 0.1 to 2 wt%,
  • the weight of chromium is continuously stirred for a certain period of time (for example, 3 to 8 hours), and then dried at a high temperature; then, high temperature baking is carried out in a fluidized bed, wherein the low temperature stage (for example, 100 ° C to 300 ° C) is calcined in a nitrogen atmosphere.
  • the invention provides a preparation method of a fluorine-modified supported chromium-vanadium double-site catalyst comprising the following steps:
  • a pre-reduction activation treatment is carried out by adding an organometallic co-catalyst to the prepared fluorine-modified supported chromium-vanadium double-site catalyst, followed by drying and storage.
  • the above method is a pre-reduction activation treatment of the obtained fluorine-modified supported chromium-vanadium double-site catalyst.
  • Step i) is to prepare a fluorine-modified supported chromium-vanadium double-site catalyst by any one of the above six methods
  • step ⁇ ) is to pre-reduction and activate the catalyst by adding an organometallic cocatalyst under an inert atmosphere.
  • the organometallic cocatalyst comprises an organoaluminum compound, an organolithium compound, an organoboron compound, or the like, any cocatalyst for olefin polymerization known to those skilled in the art or a combination thereof.
  • the organoaluminum compound used as a cocatalyst may include tridecyl aluminum A1R 3 , dinonyl decyl aluminum oxide Al OR, dinonyl aluminum halide A1 X, aluminoxane, ethyl sesqui can be used.
  • R is a fluorenyl group, for example, a fluorenyl group having 1 to 12 carbon atoms, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, n-pentyl, N-hexyl, n-heptyl, n-octyl, n-decyl, n-dodecyl, and the like
  • X is a halogen such as fluorine, chlorine, bromine and iodine, preferably chlorine.
  • the aluminoxane may include a reaction of all of the bismuth aluminum and water such as methylaluminum oxyhydroxide (MAO).
  • the organoaluminum compound as a cocatalyst may be used alone or in two or two Used in combination.
  • the aluminum compound may, for example, be triethyl aluminum, triisobutyl aluminum, diethyl aluminum ethoxide, diethyl aluminum dichloride, methyl aluminoxane or the like.
  • the fluorine-modified supported chromium-vanadium double-site catalyst when subjected to a pre-reduction activation treatment using an organoaluminum cocatalyst, the aluminum/chromium molar ratio is between 0 and 1000, preferably between 0 and 100, more preferably 0. ⁇ 50, the reduction activation treatment temperature is between room temperature and 10 CTC, preferably between room temperature and 6 CTC, and the reduction activation treatment time is 0.5 to 20 hours, preferably 0.5 to 10 hours, and the reduction activation treatment is performed by stirring, preferably continuous stirring, after the treatment is completed.
  • drying is carried out under an inert gas atmosphere, for example, under an atmosphere of nitrogen, helium, argon, etc., preferably under a nitrogen atmosphere, and the drying process can also be carried out. It is carried out under vacuum.
  • the resulting pre-reductively activated fluorine-modified supported chromium-vanadium double-site catalyst is stored for use in an inert gas atmosphere.
  • the specific operation of preparing the catalyst of the present invention comprises: dissolving ammonium hexafluorosilicate in water to form a solution, wherein the fluorine loading amount meets the requirements of the present invention with respect to the total weight of the catalyst (for example, 0.01 to 10% by weight, based on the weight of F) )), adding silica gel to the above solution, stirring at room temperature for a certain period of time (for example, 4 ⁇ 8h), then heating and drying for 8 ⁇ 15h; drying the product in a fluidized bed for high temperature roasting, wherein at low temperature Stage (for example, 100 ⁇ 300 ° C) to remove the physical water in the carrier by roasting in a nitrogen atmosphere, and to remove a part of the hydroxyl groups on the surface of the carrier in a high temperature stage (for example, 300 ° C to 900 ° C) in a dry air.
  • a high temperature stage for example, 300 ° C to 900 ° C
  • the obtained fluorine-modified silica gel is immersed in a certain concentration of ammonium metavanadate solution, and the vanadium loading amount meets the requirements of the present invention with respect to the total weight of the catalyst (for example, 0.1 to 10 wt%, based on the weight of vanadium); After the time (for example, 4 to 8 hours), the temperature is dried; the fluorine-modified silica gel containing ammonium metavanadate is calcined in a fluidized bed at a low temperature stage (for example, 100 ° C to 300 ° C) in nitrogen.
  • a low temperature stage for example, 100 ° C to 300 ° C
  • the physical water adsorbed in the carrier is removed by roasting in an atmosphere, and is partially calcined in a dry air at a high temperature stage (for example, 300 ° C to 900 ° C) to remove a part of the hydroxyl groups on the surface of the carrier, and is maintained at a high temperature for a certain period of time (for example, 3 to 8). Hours); Natural cooling and cooling, switching to nitrogen protection when cooled to 300 ⁇ 400 °C, to obtain vanadium-bearing catalyst precursor.
  • a high temperature stage for example, 300 ° C to 900 ° C
  • the inorganic chromium source is supported on the catalyst precursor prepared by the above method, and the chromium loading is consistent with the requirements herein (for example, 0.1 to 3 wt% of the total weight of the catalyst, based on the weight of chromium), and continuously stirred for a certain period of time (for example, 3) After ⁇ 8 hours), the temperature is dried; then high temperature calcination is carried out in a fluidized bed, wherein the physical water adsorbed in the carrier is removed by calcination in a low temperature stage (for example, 10 CTC -300 ° C) in a high temperature stage (for example, 300 °C ⁇ 900 °C) Roasting in a dry air to remove some of the hydroxyl groups on the surface of the inorganic carrier, maintaining a certain period of time (for example, 3 to 8 hours) in the high temperature stage; cooling naturally, cooling to 300 ⁇ 400 °C Switch to nitrogen protection, transfer under nitrogen protection, and store for use.
  • a low temperature stage for example, 10
  • the catalyst is pre-reduced and activated by adding triethylaluminum, the aluminum/chromium molar ratio is between 0 and 50, the treatment temperature is from room temperature to 60 ° C, continuous stirring is for 0.5 to 10 hours, and then at 60 to 120 ° C.
  • the drying is carried out for 2 to 8 hours, and the drying is carried out under an inert gas atmosphere, for example, under an atmosphere of nitrogen, helium, argon or the like, preferably under a nitrogen atmosphere, and the drying process can also be carried out under vacuum.
  • the resulting pre-reductively activated fluorine-modified supported chromium-vanadium double-site catalyst is stored for use in an inert gas atmosphere.
  • the supported metal oxide double-site ethylene polymerization catalyst of the invention (including the above-mentioned chromium-vanadium double-site catalyst activated by organometallic cocatalyst pre-reduction) can be used for homopolymerization of ethylene or copolymerization of ethylene and (X-olefin).
  • An organometallic cocatalyst, hydrogen, or the like may be added as needed.
  • a method for producing an ethylene homopolymer and an acetonitrile/(X-olefin copolymer) by using the supported metal oxide double-site ethylene polymerization catalyst of the present invention particularly for producing A method of broad molecular weight distribution of olefin polymers.
  • the olefin used in the polymerization generally contains ethylene as a polymerization monomer.
  • the olefin used in the polymerization further comprises a comonomer.
  • the comonomer may be an ⁇ -olefin having 3 to 20 carbon atoms, such as propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-oxime Alkene, 1-decene, 1-dodecene, 4-methyl-1-pentene, 4-methyl-1-hexene, etc.; these may be used singly or in combination of two or more.
  • the comonomer is preferably 1-butene, 1-hexene, 1-octene and 1-decene.
  • the amount of comonomer is generally from 0 to 30 vol%, preferably from 0 to 10 vol%, based on the volume concentration of the comonomer during polymerization.
  • organometallic cocatalyst (such as the organometallic cocatalyst described above) may be further added to the polymerization system during the polymerization, and according to one embodiment, the organometallic cocatalyst may use an organoaluminum compound, and the organoaluminum compound may be used. Mention may be made, among others, of triethylaluminum, triisobutylaluminum, diethylaluminum ethoxide, diethylaluminum dichloride, and methylaluminoxane.
  • the organometallic aluminum compound is usually used in an amount of from 0 to 1,000, preferably from 0 to 70, more preferably from 0 to 50, based on the aluminum/chromium molar ratio.
  • the above polymerization reaction may include a molecular weight modifier, and hydrogen may be mentioned as an example.
  • the above polymer production method of the present invention is not subject to any particular limitation in terms of its polymerization method.
  • the above-mentioned supported metal oxide double active center ethylene polymerization catalyst of the present invention is used to produce an ethylene homopolymer or
  • the method of copolymerizing ethylene and an oc-olefin may include a gas phase polymerization method, a slurry polymerization method, a suspension polymerization method, a bulk polymerization method, a solution polymerization method, and the like.
  • the method for producing an olefin polymer using the catalyst of the present invention is not particularly limited, and a gas phase polymerization method, a slurry polymerization method, a suspension polymerization method, a bulk polymerization method, which are known in the art, may be employed. Conventional embodiments of the solution polymerization method, polymerization conditions, and the like are carried out.
  • a slurry polymerization process comprising adding ethylene to the reactor, then adding a solvent and a cocatalyst (organoaluminum compound) and optionally adding hydrogen and a comonomer, and finally adding the supported metal of the present invention.
  • the oxide double-site ethylene polymerization catalyst starts to polymerize.
  • the solvent used in the above slurry polymerization is generally any solvent known in the art for the polymerization of olefins.
  • the solvent may be an anthracene having 3 to 20 carbon atoms, such as propionium, n-butyl hydrazine, isobutyl hydrazine, n-pentamidine, isovaleryl, neopentyl, hexamethylene, cyclohexanthene, orthoquinone , Zheng Xin, etc.; These solvents may be used singly or in combination of two or more.
  • the solvent is preferably isobutyl hydrazine, isovaleryl, n-hexanide, cyclohexanyl, n-glyoxime or the like.
  • the polymerization is carried out by a conventional slurry polymerization method, as follows: The polymerization reactor is vacuum-heated and then replaced with high-purity nitrogen gas, repeated three times, and then replaced with a small amount of ethylene monomer. Finally, the reactor is filled with ethylene to a slight positive pressure (0.12 MP a ); a desulfurized deoxidized purified solvent such as n-glycol, a certain amount of mercapto aluminum as a cocatalyst, and hydrogen blend copolymerization are added to the autoclave. In the experiment, a certain amount of hydrogen and comonomer need to be separately added, and the ethylene pressure is adjusted to 0.15 MPa.
  • the catalyst of the present invention is added to start the polymerization reaction; the instantaneous consumption of the monomer ethylene is collected online during the reaction (by connecting the computer High-precision ethylene mass flow meter) and recorded by computer. After a certain time (for example, 1 hour) at a certain temperature (for example, 35 ° C -100 ° C), the reaction is terminated by adding a hydrochloric acid/ethanol mixed solution; Wash, vacuum dry, weigh and analyze.
  • the present invention introduces a supported vanadium active component onto a conventional supported Phillips chromium-based catalyst.
  • the inventive catalyst contains two active components, namely supported chromium oxide and vanadium oxide.
  • the present invention also provides a supported chromium-vanadium oxide dual active site catalyst modified with titanium dioxide and fluorine.
  • the catalyst of the invention can produce ethylene homopolymer and ethylene/oc-olefin copolymer with wide molecular weight distribution in a single reactor or in a combined reactor, and has high ethylene homopolymerization and copolymerization activity of ethylene and 0C-olefin. .
  • the molecular weight and molecular weight distribution of the ethylene homopolymer and the acetonitrile/OC-olefin copolymer can be conveniently and easily adjusted by changing the amount of the promoter, the polymerization temperature, the molecular weight regulator and the like. And comonomer content and distribution, which makes it convenient and easy A polymer product having the desired properties is obtained.
  • Figure 1 is a schematic illustration of the carrier or catalyst precursor calcination procedure.
  • Figure 2 is a schematic illustration of the carrier or catalyst precursor calcination procedure.
  • Figure 3 is a high temperature GPC spectrum of a pressurized ethylene homopolymer of three examples (Comparative Examples 10, 11 and Example 20).
  • Figure 4 is a high temperature GPC spectrum of a pressurized ethylene, 1-hexene copolymer of three examples (Comparative Examples 12, 13 and Example 21).
  • Figure 5 is a schematic illustration of the carrier or catalyst precursor calcination procedure.
  • Figure 6 is a high temperature GPC spectrum of an atmospheric ethylene homopolymer of three examples - Comparative Example 16-1, b-Example 37, c-Example 38-1).
  • Figure ⁇ is a high temperature GPC spectrum of an atmospheric ethylene homopolymer of three examples - Comparative Example 16-1, b-Example 39).
  • Figure 8 is a schematic illustration of the carrier or catalyst precursor calcination procedure. detailed description
  • the invention is further illustrated by the following specific examples, but the invention is not limited to the following examples.
  • the method is a conventional method unless otherwise specified.
  • the materials are commercially available from the public unless otherwise stated.
  • the silica gel used in the examples was commercially available as Davison 955 or 948.
  • the weight average molecular weight and molecular weight distribution were determined by high temperature gel chromatography: In this experiment, a PL-220 high temperature gel permeation chromatograph (Polymer Laboratories) was used to determine the molecular weight of the polyethylene and its molecular weight distribution. In the experiment, 1,2,4-trichlorobenzene was used as a solvent and measured at 16 CTC. Data were processed using a universal calibration method using narrowly distributed polystyrene as a standard.
  • the obtained sample was again immersed in a basic chromium acetate aqueous solution (Cr loading: 0.5 wt%), immersed for 4 h under continuous stirring at room temperature, dried at 12 CTC for 4 h, and then transferred to a 12 CTC oven for 6 h ; the dried sample was placed in a quartz fluidized solution.
  • the bed was calcined and activated, calcined in air at 60 CTC for 4 h, and then naturally cooled and cooled under nitrogen protection.
  • the calcination procedure is shown in Figure 2, and the catalyst is saved for use.
  • the obtained sample was again immersed in a basic chromium acetate solution (Cr loading 0.5 wt%), immersed for 4 h at room temperature, dried at 12 CTC for 4 h, then transferred to an oven for 6 h; the dried sample was placed in a quartz fluidized bed for roasting. Activated, in air at 60CTC, kept for 4h, naturally cooled under nitrogen protection, the roasting procedure is shown in Figure 2, and the catalyst is saved for use.
  • the obtained sample was again immersed in an aqueous solution of basic chromium acetate (<0.5wt3 ⁇ 4), and immersed for 4 hours under continuous stirring at room temperature, then heated to 12 CTC for 4 h, then transferred to an oven for 6 h ; the dried sample was placed in quartz fluidized. The bed was calcined and activated, and kept at 60 CTC for 4 h, and naturally cooled under nitrogen protection to obtain a catalyst for use.
  • &lt basic chromium acetate
  • the mixture was immersed for 4 h under 4 CTC, heated to 12 CTC for 4 h, and then transferred to a 12 CTC oven for 6 h .
  • the dried sample was placed in a quartz fluidized bed for calcination activation, and kept at 60 CTC for 4 h in high purity air, then naturally protected under nitrogen. Cooling and cooling, the catalyst is saved for use.
  • the obtained sample was again immersed in a basic chromium acetate aqueous solution (& loading of 0.5 wt%), and immersed for 4 hours under continuous stirring at room temperature, then heated to 12 CTC for 4 h, then transferred to an oven for 6 h; the dried sample was placed in a quartz stream.
  • the roasting activation in the chemical bed, under 60CTC, heat preservation for 4h, the roasting procedure is shown in Figure 2, naturally cooled under nitrogen protection. But.
  • an organometallic cocatalyst having a concentration of 1 mol/L, methylaluminoxane (Al/Cr molar ratio 30), was added, followed by drying at 10 CTC for 4 hours to remove the solvent, and the drying was carried out under a nitrogen atmosphere.
  • the pre-reduced activated catalyst was stored for use in a nitrogen atmosphere.
  • Example 1 160 mg of the catalyst of Example 1 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated to remove impurities, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TIBA triisobutylaluminum
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the autoclave was constant at 9 CTC, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 2 160 mg of the catalyst of Example 2 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • TIBA triisobutylaluminum
  • the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer.
  • a 50 mL hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 3 160 mg of the catalyst of Example 3 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • DEC diethyl chloroformate
  • Example 5 160 mg of the catalyst of Example 5 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • MAO methylaluminoxane
  • the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer.
  • a 50 mL hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum oven at 60 ° C for 4 hours, weighed and analyzed.
  • Example 6 160 mg of the catalyst of Example 6 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated to remove impurities, and was evacuated three times with high-purity nitrogen gas, and finally the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TIBA triisobutylaluminum
  • the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer.
  • a 50 mL hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum oven at 60 ° C for 4 hours, weighed and analyzed.
  • Example 7 The catalyst of 160 mg in Example 7 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated to remove impurities, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • 70 mL of purified n-glycol solvent was added to the reactor to adjust the ethylene pressure to 0.15 MPa.
  • the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a 50 mL hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 60 ° C for 4 hours, weighed and analyzed.
  • Example 4 The catalyst of 160 mg in Example 4 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated to remove impurities, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • 70 mL of purified n-glycol solvent was added to the reactor to adjust the ethylene pressure to 0.15 MPa. Waiting for the kettle After the internal temperature was constant at 90 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a 50 mL hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 60 ° C for 4 hours, weighed and analyzed.
  • Example 4 The catalyst of 160 mg in Example 4 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-treated to remove impurities, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TIBA triisobutylaluminum
  • the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (on a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer.
  • a 50 mL hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum oven at 60 ° C for 4 hours, weighed and analyzed.
  • the catalyst of 160 mg in Example 4 was weighed and subjected to atmospheric pressure polymerization at different temperatures.
  • the polymerization reactor was vacuum-heated to remove impurities, and was evacuated three times with high-purity nitrogen gas, and finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TIBA triisobutylaluminum
  • the catalyst is added to start the reaction.
  • the instantaneous consumption of monomer ethylene is collected online during the reaction (by connecting the computer with high precision) Ethylene mass flow meter) and recorded by computer.
  • 50 mL hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum oven at 60 ° C for 4 h, and then weighed and analyzed.
  • Example 4 The catalyst of 160 mg in Example 4 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • TSA triethylaluminum
  • the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer.
  • a 50 mL hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum oven at 60 ° C for 4 hours, weighed and analyzed.
  • Example 4 The catalyst of 160 mg in Example 4 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • TIBA triisobutylaluminum
  • the volume ratio of the olefin, i.e., 1-hexene, to the solvent used for the polymerization is 1, 3, and 5 vol%, respectively (corresponding to Examples 18-1, 18-2, and 18-3, respectively), and 30 mL of dehydrated and deoxidized purified Ginger solvent, adjust the ethylene pressure to 0.15 MPa.
  • the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene was collected online during the reaction and recorded by a computer.
  • a 50 mL hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum oven at 60 ° C for 4 hours, weighed and analyzed.
  • Example 4 The catalyst of 160 mg in Example 4 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • TIBA triisobutylaluminum
  • the catalyst of 100 mg in Example 4 was weighed and subjected to a pressure polymerization experiment.
  • the stainless steel kettle was wiped clean with a solvent, the catalyst was charged, and it was pumped with high purity N2 for 30 min under heating. It was replaced once with ethylene gas, and the autoclave pressure was adjusted to 0.12 MPa.
  • TIBA triisobutylaluminum
  • the line collects the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) and is recorded by a computer. After lh, the polymer and solvent were poured into a 100 mL hydrochloric acid/ethanol mixed solution to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 60 ° C for 4 hours, weighed and analyzed.
  • the catalyst 100 mg of the catalyst of Example 4 was weighed and subjected to a pressure polymerization experiment.
  • the stainless steel kettle was wiped clean with a solvent, and the catalyst was charged and pumped with high purity N2 for 30 minutes under heating.
  • TIBA triisobutylaluminum
  • the instantaneous consumption of monomeric ethylene was collected online during the reaction and recorded by a computer. After lh, the polymer and solvent were poured into a 100 mL hydrochloric acid/ethanol mixed solution to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 60 ° C for 4 hours, weighed and analyzed.
  • silica gel carrier 10 g was immersed in an aqueous solution of ammonium metavanadate (vanadium loading is 0.48wt%), stirred under 5CTC for 4h, dried and then transferred to oven for 6h; the dried sample is placed in a quartz fluidized bed in high purity air for 600 ° (roasting activation for 4 h, in Naturally cooled under nitrogen to obtain a supported vanadium catalyst.
  • the Phillips catalyst and the supported vanadium catalyst obtained above were mechanically mixed under a nitrogen atmosphere at a molar ratio of Cr/V of 2:1 to obtain a mixed catalyst for storage.
  • the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer.
  • a 50 mL hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum oven at 60 ° C for 4 hours, weighed and analyzed.
  • the catalyst of Comparative Example 2 160 mg was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was heated and removed by vacuum, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TIBA triisobutylaluminum
  • the instantaneous consumption of monomeric ethylene was collected online during the reaction and recorded by a computer. After lh, a 50 mL hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 60 ° C for 4 hours, weighed and analyzed.
  • the 160 mg catalyst of Comparative Example 3 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • TIBA triisobutylaluminum
  • the volume ratio of the olefin, i.e., 1-hexene, to the solvent used for the polymerization was 1, 3, and 5 vol%, respectively (corresponding to Comparative Examples 7-1, 7-2, and 7-3, respectively), and 30 mL of the purified n-glycine solution was used. Rinse the wall and adjust the ethylene pressure to 0.15 MPa. After the temperature in the kettle was constant at 90 ° C, the catalyst was added to start the reaction. The instantaneous consumption of monomeric ethylene (on a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a 50 mL hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 60 ° C for 4 hours, weighed and analyzed.
  • olefin i.e., 1-hexene
  • the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to the computer) was collected online during the reaction and recorded by a computer.
  • 50 mL of hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum oven at 60 ° C for 4 hours, weighed and analyzed.
  • the 160 mg catalyst of Comparative Example 1 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the triethylaluminum (TEA) of 5 is used as a cocatalyst, and 30 mL of dehydrated and deoxidized purified n-glycol solvent is added to adjust the ethylene pressure to 0.15 MPa.
  • the catalyst is added to start the reaction.
  • Instantaneous consumption of monomeric ethylene collected online during the process (by connecting high precision vinyl to the computer) Volume meter) and recorded by computer.
  • a 50 mL hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum oven at 60 ° C for 4 hours, weighed and analyzed.
  • the catalyst 100 mg of Comparative Example 1 was weighed and subjected to a pressure polymerization experiment.
  • the stainless steel kettle was wiped clean with a solvent, and the catalyst was charged and pumped with high purity N2 for 30 minutes under heating. It was replaced once with ethylene gas, and the autoclave pressure was adjusted to 0.12 MPa.
  • the instantaneous consumption of monomeric ethylene was collected online during the reaction and recorded by a computer. After lh, the polymer and solvent were poured into a 100 mL hydrochloric acid/ethanol mixed solution to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 60 ° C for 4 hours, weighed and analyzed.
  • the catalyst of 100 mg in Comparative Example 2 was weighed and subjected to a pressure polymerization experiment.
  • the stainless steel kettle was wiped clean with a solvent, and the catalyst was charged and pumped with high purity N2 for 30 minutes under heating. It was replaced once with ethylene gas, and the autoclave pressure was adjusted to 0.12 MPa.
  • the temperature in the autoclave was constant at 90 °C, the ethylene pressure was adjusted to 0.4 MPa, and the catalyst bottle was broken and the reaction was started.
  • the instantaneous consumption of monomeric ethylene was collected online during the reaction and recorded by a computer. After lh, the polymer and solvent were poured into a 100 mL hydrochloric acid/ethanol mixed solution to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 60 ° C for 4 hours, weighed and analyzed.
  • a 100 mg catalyst of Comparative Example 1 was weighed and subjected to a pressure polymerization experiment.
  • the stainless steel kettle was wiped clean with a solvent, the catalyst was charged, and it was pumped with high purity N2 for 30 min under heating.
  • the gas was replaced once with ethylene gas, and the pressure of the kettle was adjusted to 0.12 MPa.
  • the temperature in the autoclave was constant at 90 ° C, the ethylene pressure was adjusted to 0.4 MPa, and the inside of the catalyst bottle was broken and the reaction was started.
  • Table 3 shows the effect of different promoters on the homopolymerization activity of chromium-vanadium double-site catalysts and Phillips catalysts.
  • the use of TEA as a cocatalyst is less active than the use of TiBA as a cocatalyst.
  • the polyethylene of the product under different cocatalysts has a similar melting point, but the molecular weight and molecular weight distribution are greatly different, indicating the degree of reduction of the active site of the catalyst and the reduction of the active site of the catalyst. The distribution has a greater impact.
  • Example 16-1 50 5 535.6 132.35 3.65 29.4
  • Example 16-2 70 5 325.5 132.28 3.39 13.8
  • Table 4 shows the results of ethylene polymerization of the chromium-vanadium double-site catalyst under different polymerization temperatures (Example 15 Example 15-1).
  • the catalyst has the highest activity at 5 CTC, and the polymerization activity of the catalyst decreases with increasing temperature, and has the lowest activity at 9 CTC.
  • the polyethylene products obtained at different polymerization temperatures have similar melting points, and the molecular weight decreases with the increase of polymerization temperature, indicating that the increase of polymerization temperature is more favorable for the polymerization chain transfer.
  • Example 8 5 139.4 131.85 2.16 25.8
  • the polymerization activity of the chromium vanadium catalyst prepared by the two different loading methods of the stepwise impregnation and the co-impregnation was carried out under the same conditions, and it was found that the composite catalyst prepared by the stepwise impregnation had higher activity.
  • Table 6 shows the results of the polymerization of the chromium vanadium double-site catalyst and the Phillips catalyst ethylene/1-hexene.
  • the copolymerization activity of ethylene hexene in the chromium-vanadium double-site catalyst showed a tendency to decrease.
  • the results of homopolymerization of ethylene before binding showed that the copolymerization activity of ethylene hexene was lower than that of ethylene homopolymerization.
  • the acetonitrile/1-hexene copolymerization activity of the Phillips catalyst showed a slight increase and then a decrease. With the addition of 1-hexane, the polymerization activity of other chromium-vanadium double-site catalysts also decreased.
  • Figures 3 and 4 show GPC spectra of a chromium-vanadium double-site catalyst, a Phillips catalyst, and an ethylene homopolymer supported on a vanadium oxide catalyst and a copolymer of ethylene and 1-hexene, respectively.
  • Table 7 shows that the ethylene homopolymerization activity of different catalysts is lower than that without hydrogen, and the molecular weight and melting point of polyethylene are reduced, indicating that hydrogen acts as a chain transfer agent, resulting in a decrease in molecular weight and melting point. .
  • the silica gel was finally cooled and cooled under nitrogen.
  • the calcination procedure was as shown in Fig. 5, and the titanium dioxide-modified silica gel obtained by the impregnation method was obtained.
  • the titanium oxide-modified silica gel obtained by the above method was immersed in an aqueous solution of ammonium metavanadate (vanadium loading: 0.24 wt%), and continuously stirred at 45 ° C for 4 hours until the reaction was completed.
  • 12CTC oil bath for 6 h transferred to 120 oven for 8 h; the dried sample was placed in a quartz fluidized bed for roasting activation, and kept at 450 ° C for 4 h in air, and naturally cooled under nitrogen protection.
  • the firing procedure is shown in Figure 1.
  • the obtained sample was again immersed in an aqueous solution of basic chromium acetate (chromium loading: 0.5 wt%), and stirring was continued for 4 hours at room temperature until the reaction was completed. Then, it was dried in a 12CTC oil bath for 6 hours, transferred to a blast drying oven at 12 CTC for 8 h, and then the obtained sample was subjected to high temperature roasting in a fluidized bed, and kept at 60 CTC for 4 h in high purity air, and then naturally under nitrogen. Cooling and cooling, the above roasting process is shown in Figure 2. Finally, the catalyst was transferred to a glove box under nitrogen protection for storage.
  • basic chromium acetate chromium loading: 0.5 wt%)
  • the calcination procedure shown in Fig. 5 was carried out to obtain a titania-modified silica gel obtained by the impregnation method. Then, the titanium oxide-modified silica gel obtained by the above method was immersed in an aqueous solution of ammonium metavanadate (vanadium loading: 0.24 wt%), and continuously stirred at 45 ° C for 4 hours until the reaction was completed. Then dried in 12CTC oil bath for 6 h, transferred to 12CTC oven for 8 h; the dried sample was placed in a quartz fluidized bed for roasting activation, and kept at 450 ° C for 4 h in air, and naturally cooled under nitrogen protection. The firing procedure is shown in Figure 1.
  • the obtained sample was again immersed in an aqueous solution of basic chromium acetate (chromium loading: 0.5 wt%), and stirring was continued for 4 hours at room temperature until the reaction was completed. Then, it was dried in a 12CTC oil bath for 6 hours, transferred to a blast drying oven at 12 CTC for 8 h, and then the obtained sample was subjected to high temperature roasting in a fluidized bed, and kept at 60 CTC for 4 h in high purity air, and then naturally under nitrogen. Cooling and cooling, the above roasting process is shown in Figure 2. Finally, the catalyst was transferred to a glove box under nitrogen protection for storage.
  • basic chromium acetate chromium loading: 0.5 wt%)
  • the calcination activation was carried out, and the temperature was kept at 60 CTC for 4 h under high-purity air, and the silica gel was finally cooled and cooled under nitrogen.
  • the calcination procedure shown in Fig. 5 was carried out to obtain a titania-modified silica gel obtained by the impregnation method.
  • the titanium oxide-modified silica gel obtained by the above method was immersed in an aqueous solution of ammonium metavanadate (vanadium loading: 0.24 wt%), and continuously stirred at 45 ° C for 4 hours until the reaction was completed.
  • Example 25 Then, it was dried in a 12CTC oil bath for 6 hours, transferred to a blast drying oven at 12 CTC for 8 h, and then the obtained sample was subjected to high temperature roasting in a fluidized bed, and kept at 60 CTC for 4 h in high purity air, and then naturally under nitrogen. Cooling and cooling, the above roasting process is shown in Figure 2. Finally, the catalyst was transferred to a glove box under nitrogen protection for storage.
  • silica gel having a pore volume of 1.5 to 1.7 cm 3 /g and a surface area of 250 to 300 m 2 /g
  • a tetra-n-butyl titanate solution titanium loading of 3 wt%.
  • the oil bath was dried at 8 CTC for 4 hours, and then the solvent in the silica support pores was further removed by vacuum drying for 2 hours, and then dried in an air drying oven at 8 CTC for 8 hours, and then the dried sample was placed in a fluidized bed.
  • the calcination activation was carried out, and the temperature was kept at 60 CTC for 4 hours under high-purity air.
  • the silica gel was finally cooled and cooled under nitrogen.
  • the calcination procedure was as shown in Fig. 5, and the titanium dioxide-modified silica gel obtained by the impregnation method was obtained. Then, the titanium oxide-modified silica gel obtained by the above method was immersed in an aqueous solution of ammonium metavanadate (vanadium loading: 0.48 wt%), and continuously stirred at 45 ° C for 4 hours until the reaction was completed. Then dried in 12CTC oil bath for 6 h, transferred to 12CTC oven for 8 h; the dried sample was placed in a quartz fluidized bed for roasting activation, and kept at 450 ° C for 4 h in air, and naturally cooled under nitrogen protection. The firing procedure is shown in Figure 1.
  • the obtained sample was again immersed in an aqueous solution of basic chromium acetate (chromium loading: 0.5 wt%), and stirring was continued for 4 hours at room temperature until the reaction was completed. Then, it was dried in a 12CTC oil bath for 6 hours, transferred to a blast drying oven at 12 CTC for 8 h, and then the obtained sample was subjected to high temperature roasting in a fluidized bed, and kept at 60 CTC for 4 h in high purity air, and then naturally cooled under nitrogen. Cooling, the above firing process is shown in Figure 2. Finally, the catalyst was transferred to a glove box under nitrogen protection for storage.
  • basic chromium acetate chromium loading: 0.5 wt%)
  • silica gel hole volume 1.5-1.7 cm 3 /g, surface area 250-300 m 2 /g
  • a tetra-n-butyl titanate solution of n-hexane titanium loading of 5 wt%.
  • the oil bath was dried at 8 CTC for 4 hours, and then the solvent in the silica support pores was further removed by vacuum drying for 2 hours, and then dried in an air drying oven at 8 CTC for 8 hours, and then the dried sample was placed in a fluidized bed.
  • the calcination activation was carried out, and the temperature was kept at 60 CTC for 4 hours under high-purity air.
  • the silica gel was finally cooled and cooled under nitrogen.
  • the calcination procedure was as shown in Fig. 5, and the titanium dioxide-modified silica gel obtained by the impregnation method was obtained. Then, the titanium dioxide modified silica gel prepared by the above method is immersed in an aqueous solution of basic chromium acetate and ammonium metavanadate (chromium loading of 0.5 wt%, vanadium loading of 0.24 wt%), continuous at 45 ° C Stir for 4 hours until the reaction is complete.
  • Example 27 10 g of silica gel (having a pore volume of 1.5 to 1.7 cm 3 /g and a surface area of 250 to 300 m 2 /g) was immersed in a tetra-n-butyl titanate solution (titanium loading of 3 wt%). After continuous stirring for 4 hours, the oil bath was dried at 8 CTC for 4 hours, and then the solvent in the silica support pores was further removed by vacuum drying for 2 hours, and then dried in an air drying oven at 8 CTC for 8 hours, and then the dried sample was placed in a fluidized bed. The calcination activation was carried out, and the temperature was kept at 60 CTC for 4 hours under high-purity air. The silica gel was finally cooled and cooled under nitrogen.
  • tetra-n-butyl titanate solution titanium loading of 3 wt%
  • the calcination procedure was as shown in Fig. 5, and the titanium dioxide-modified silica gel obtained by the impregnation method was obtained. Then, the titanium oxide-modified silica gel obtained by the above method was immersed in an aqueous solution of ammonium metavanadate (vanadium loading: 0.96 wt%), and continuously stirred at 45 ° C for 4 hours until the reaction was completed. Then dried in 12CTC oil bath for 6 h, transferred to 12CTC oven for 8 h; the dried sample was placed in a quartz fluidized bed for roasting activation, and kept at 450 ° C for 4 h in air, and naturally cooled under nitrogen protection. The firing procedure is shown in Figure 1.
  • the obtained sample was again immersed in an aqueous solution of basic chromium acetate (chromium loading: 0.5 wt%), and stirring was continued for 4 hours at room temperature until the reaction was completed. Then, it was dried in a 12CTC oil bath for 6 hours, transferred to a blast drying oven at 12 CTC for 8 h, and then the obtained sample was subjected to high temperature roasting in a fluidized bed, and kept at 60 CTC for 4 h in high purity air, and then naturally cooled under nitrogen. Cooling, the above firing process is shown in Figure 2. Finally, the catalyst was transferred to a glove box under nitrogen protection for storage.
  • basic chromium acetate chromium loading: 0.5 wt%)
  • the solvent in the pores of the silica gel carrier was dried in 8CTC in a blast drying oven for 8 h, then the dried sample was calcined and activated in a fluidized bed, and kept at 60 CTC for 4 h under high purity air.
  • the silica gel was finally cooled under nitrogen.
  • the calcination procedure described above is as shown in Fig. 5, and a titanium oxide-modified silica gel obtained by a sol-gel method is obtained.
  • the titanium oxide-modified silica gel obtained by the above method was immersed in an aqueous solution of vanadyl oxalate (vanadium loading: 0.24 wt%), and stirring was continued for 4 hours at room temperature until the reaction was completed.
  • Example 29 Then dry in a 12CTC oil bath After 6 hours, transfer to 12CTC in a blast drying oven for 8 h, then the sample is subjected to high temperature roasting in a fluidized bed, and kept at 60 CTC for 4 h in high purity air, then cooled naturally under nitrogen. The above roasting process is shown in Fig. 2 is shown. Finally, the catalyst was transferred to a glove box under nitrogen protection for storage.
  • Example 29
  • silica gel having a pore volume of 1.5 to 1.7 cm 3 /g and a surface area of 250 to 300 m 2 /g
  • tetra-n-butyl titanate solution titanium loading of 3 wt%
  • the calcination activation was carried out, and the temperature was kept at 50 CTC for 4 h under high purity air, and the silica gel was finally cooled down under nitrogen to obtain a titanium dioxide modified silica gel prepared by the impregnation method. Then, the titanium oxide-modified silica gel obtained by the above method was immersed in an aqueous solution of ammonium metavanadate (vanadium loading: 0.16 wt%), and continuously stirred at 45 ° C for 4 hours until the reaction was completed.
  • ammonium metavanadate vanadium loading: 0.16 wt%
  • Tetraethyl titanate and sodium silicate were mixed (titanium loading 5wt%), stirred at room temperature for 4h, then dried in oil bath 12CTC for 4h, then placed in a vacuum drying oven at 12CTC for 4h, then transferred to 12CTC blast Drying in a dry box for 8 h, then drying the dried product in a fluidized bed at a high temperature, holding 60 CTC for 4 h under high purity air, and finally cooling the silica gel under nitrogen to cool down.
  • the calcination procedure is shown in Figure 5, and titanium dioxide is obtained. Modified silica gel.
  • the titanium oxide-modified silica gel obtained by the above method was immersed in an aqueous solution of vanadyl sulfate (vanadium loading: 0.24 wt%), and stirring was continued for 4 hours at room temperature until the reaction was completed.
  • vanadyl sulfate vanadium loading: 0.24 wt%
  • the dried sample was placed in a quartz fluidized bed for calcination activation, and kept at 50 CTC for 4 h in air, and naturally cooled under nitrogen protection.
  • the obtained sample was again immersed in an aqueous solution of chromium trioxide (chromium loading of 0.5 wt%), and stirring was continued for 4 hours at room temperature until the reaction was completed.
  • Isopropyl titanate was dissolved in a solvent of n-hexane, and then concentrated nitric acid was added to adjust the pH to 2 to 3, and refluxed at 5 CTC for 5 hours.
  • the refluxed product was transferred to a configuration bottle, and 10 g of silica gel (pore volume 1.5-1.7 cm3/g, surface area 250-300 m2/g) was added.
  • the mixture was stirred at room temperature for 4 h until the reaction was completed.
  • the oil bath was then warmed to 95 ° C until the precipitation appeared, and the resulting precipitate was placed in an 8 CTC blast oven for 8 h.
  • the dried product is calcined at a high temperature in a fluidized bed, and kept at 60 CTC for 4 h under high purity air.
  • the silica gel is finally cooled down under nitrogen, and the above calcination procedure is shown in Fig. 5 to obtain a titanium dioxide modified silica gel.
  • the titanium oxide-modified silica gel obtained by the above method was immersed in an anhydrous ethanol solution of vanadium acetylacetonate (vanadium loading: 0.24 wt%), and stirring was continued for 4 hours at room temperature until the reaction was completed.
  • locrc oil bath drying for 6 h transferred to locrc blast drying oven for 8 h; the dried sample was placed in a quartz fluidized bed for roasting activation, air-cooled at 45 CTC for 4 h, and naturally cooled under nitrogen protection.
  • the firing procedure is shown in Figure 1.
  • the obtained sample was again immersed in an aqueous solution of ammonium chromate (chromium loading of 0.5 w / o), and stirring was continued for 4 hours at room temperature until the reaction was completed.
  • the calcination activation was carried out, and the temperature was kept at 50 CTC for 4 h under high purity air, and the silica gel was finally cooled down under nitrogen to obtain a titanium dioxide modified silica gel prepared by the impregnation method. Then, the titanium oxide-modified silica gel obtained by the above method was immersed in an aqueous solution of basic chromium acetate (chromium loading: 0.5 wt%), and stirring was continued for 4 hours at room temperature until the reaction was completed.
  • chromium loading 0.5 wt%
  • silica gel hole volume 1.5-1.7 cm 3 /g, surface area 250-300 m 2 /g
  • aqueous solution of titanium sulfate and vanadyl oxalate titanium loading 5 wt%, vanadium loading 0.24wt%
  • continuous stirring for 4h 12CTC oil bath drying for 6h, transferred to 12CTC oven for 8h; the dried sample was placed in a quartz fluidized bed for roasting activation, kept in air at 60CTC for 4h, under nitrogen protection Cool down naturally.
  • the obtained sample was again immersed in an aqueous solution of basic chromium acetate (chromium loading: 0.5 wt%) ; after continuous stirring for 5 hours, 12 CTC oil bath was dried for 6 h, transferred to a 12 CTC oven for 8 h; The sample was placed in a quartz fluidized bed for calcination activation, and was kept at 60 CTC for 4 h in air, and naturally cooled under nitrogen protection. The above calcination process is shown in Fig. 2. Finally, the catalyst was transferred to a glove box under nitrogen protection for storage.
  • basic chromium acetate chromium loading: 0.5 wt%)
  • silica gel hole volume 1.5-1.7 cm 3 /g, surface area 250-300 m 2 /g
  • 10 g of silica gel was immersed in an aqueous solution of titanium sulphate and chromium trioxide (titanium loading 5 wt%, chromium loading) 0.5wt%), continuous stirring for 4h, 12CTC oil bath drying for 6h, transferred to 12CTC oven for 8h; the dried sample was placed in a quartz fluidized bed for roasting activation, kept in air at 60CTC for 4h, under nitrogen protection Cool down naturally. Finally, it is transferred and stored for use under nitrogen protection.
  • the obtained sample was again immersed in an aqueous solution of ammonium hexafluorovanadate (vanadium loading: 0.24 wt%), continuously stirred for 4 hours, dried in a 12 CTC oil bath for 6 hours, and then transferred to a 12 CTC oven for 8 hours; the dried sample was placed.
  • the quartz fluidized bed was calcined and activated, and incubated at 50 CTC for 4 h in air, and naturally cooled under nitrogen protection. Finally, the catalyst was transferred to a glove box under nitrogen protection for storage.
  • silica gel hole volume 1.5-1.7 cm 3 /g, surface area 250-300 m 2 /g
  • an aqueous solution of titanium sulfate, vanadyl oxalate and chromium trioxide titanium loading is 5 wt%) , vanadium loading is 0.24wt%, chromium loading is 0.5wt3 ⁇ 4) continuous stirring for 4h, 12CTC oil bath drying for 6h, transfer to The 12CTC oven was dried for 8 h; the dried sample was placed in a quartz fluidized bed for calcination activation, and kept at 600 ° C for 4 h in air, and naturally cooled under nitrogen protection. Naturally cooled under nitrogen protection, and finally transferred to a glove box under nitrogen protection for storage.
  • silica gel having a pore volume of 1.5 to 1.7 cm 3 /g and a surface area of 250 to 300 m 2 /g
  • tetrahexyl titanate solution titanium loading of 3 wt%
  • the oil bath was dried at 80 ° C for 4 hours, and then the solvent in the silica carrier pores was further removed by vacuum drying for 2 hours, and then dried in an air drying oven at 8 CTC for 8 hours, and then the dried sample was fluidized.
  • the bed was calcined and activated, and kept at 60 CTC for 4 h under high purity air.
  • the silica gel was finally cooled down under nitrogen, and the above calcination procedure was as shown in Fig. 5, and the titanium dioxide modified silica gel prepared by the impregnation method was obtained. Then, the titanium oxide-modified silica gel obtained by the above method was immersed in a solution of vanadium oxyacetylacetate in anhydrous ethanol (vanadium loading: 0.24 wt%), and stirring was continued for 4 hours at normal temperature until the reaction was completed.
  • Example 22 160 mg of the catalyst of Example 22 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • TiBA triisobutylaluminum
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the kettle was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer.
  • a hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • filtering The obtained polymer was dried in a vacuum oven at 6 CTC for 4 h, weighed and analyzed.
  • TiBA triisobutylaluminum
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the kettle was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 24 160 mg of the catalyst of Example 24 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated to remove impurities, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TiBA triisobutylaluminum
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the kettle was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 25 160 mg of the catalyst of Example 25 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated and removed, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • the ethylene pressure was adjusted to 0.15 MPa.
  • the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer.
  • a hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 41 160 mg of the catalyst of Example 26 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • TiBA triisobutylaluminum
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the kettle was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 27 160 mg of the catalyst of Example 27 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated and removed, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • the ethylene pressure was adjusted to 0.15 MPa.
  • the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer.
  • a hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 28 160 mg of the catalyst of Example 28 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated to remove impurities, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • the ethylene pressure was adjusted to 0.15 MPa.
  • the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer.
  • a hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 29 160 mg of the catalyst of Example 29 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • Triisobutylaluminum (TiBA) was used as a cocatalyst, and 30 mL of dehydrated and deoxygenated purified n-glycol solvent was added.
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the kettle was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 30 160 mg of the catalyst of Example 30 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated to remove impurities, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • the ethylene pressure was adjusted to 0.15 MPa.
  • the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer.
  • a hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 31 160 mg of the catalyst of Example 31 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated and removed, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • the ethylene pressure was adjusted to 0.15 MPa.
  • the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer.
  • a hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 32 160 mg of the catalyst of Example 32 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • TiBA triisobutylaluminum
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the kettle was constant at 85 ° C, the catalyst was added to start the reaction.
  • Instantaneous consumption of monomeric ethylene during on-line reaction (by connecting high-precision B to the computer) Aene mass flow meter) and recorded by computer.
  • a hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 33 160 mg of the catalyst of Example 33 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated and removed, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TiBA triisobutylaluminum
  • the instantaneous consumption of monomeric ethylene was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 34 160 mg of the catalyst of Example 34 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated and removed, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • the ethylene pressure was adjusted to 0.15 MPa.
  • the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer.
  • a hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 35 160 mg of the catalyst of Example 35 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated and removed, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • the ethylene pressure was adjusted to 0.15 MPa.
  • the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer.
  • a hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 36 160 mg of the catalyst of Example 36 was weighed and subjected to an atmospheric pressure polymerization experiment. Add the polymerization kettle to vacuum The heat was removed, and the mixture was purged three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa. Next, 70 mL of purified n-heptanium solvent was added to the reaction vessel. The ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the autoclave was constant at 85 ° C, the catalyst was added to start the reaction. The instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 60 ° C for 4 hours, weighed and analyzed.
  • Example 23 The catalyst of 160 mg in Example 23 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • TIBA triisobutylaluminum
  • 1-hexane that is, the volume ratio of 1-hexene to the solvent used for the polymerization is 2, 4, 6 vol%, respectively (corresponding to Examples 52-1, 52-2, 52-3, respectively), and 30 mL of dehydration and deoxidation is added.
  • the ethylene pressure was adjusted to 0.15 MPa.
  • the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene was collected online during the reaction and recorded by a computer.
  • a 50 mL hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum oven at 60 ° C for 4 hours, weighed and analyzed.
  • Example 24 The catalyst of 160 mg in Example 24 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • TIBA triisobutylaluminum
  • 1-hexane that is, the volume ratio of 1-hexene to the solvent used for the polymerization is 2, 4, 6 vol%, respectively (corresponding to the implementation of 53-1, 53-2, 53-3), and then adding 30 mL of dehydration and deoxidation after purification
  • the solvent is adjusted to adjust the ethylene pressure to 0.15 MPa.
  • the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene was collected online during the reaction and recorded by a computer.
  • a 50 mL hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 22 The catalyst of 160 mg in Example 22 was weighed and subjected to an atmospheric pressure polymerization experiment. Will be the polymerization reactor Empty heating and impurity removal, and pumping three times with high-purity nitrogen, and finally charging the reactor with a trace of refined ethylene to
  • the instantaneous consumption of monomeric ethylene was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 23 The catalyst of 160 mg in Example 23 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • TiBA triisobutylaluminum
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the kettle was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 24 The catalyst of 160 mg in Example 24 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • TiBA triisobutylaluminum
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the kettle was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • TIBA triisobutylaluminum
  • Example 24 160 mg of the catalyst of Example 24 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated and removed, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TAA triethylaluminum
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the kettle was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 23 160 mg of the catalyst of Example 23 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated to remove impurities, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • 70 mL of purified n-heptanium solvent was added to the reaction vessel.
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the kettle was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 60 ° C for 4 hours, weighed and analyzed.
  • Example 28 The catalyst of 160 mg in Example 28 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • TSA triethylaluminum
  • the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer.
  • a hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • the obtained sample was again immersed in an aqueous solution of basic chromium acetate (chromium loading of 0.5 wt%), and stirring was continued for 4 hours at room temperature until the reaction was completed. Then, it was dried in an oil bath at 120 °C for 6 h, transferred to a blast drying oven at 12 CTC for 8 h, and then the obtained sample was subjected to high temperature roasting in a fluidized bed, and kept at 60 CTC for 4 h in high purity air, then naturally under nitrogen. Cooling and cooling, the above roasting process is shown in Figure 2. Finally, the obtained unmodified supported chromium-vanadium double-site catalyst was transferred to a glove box under nitrogen protection for storage.
  • basic chromium acetate chromium loading of 0.5 wt%)
  • silica gel having a pore volume of 1.5 to 1.7 cm 3 /g and a surface area of 250 to 300 m 2 /g
  • isopropyl titanate in hexamethylene hydride titanium loading of 3 wt%
  • the oil bath was dried at 80 ° C for 4 h, and then the solvent in the silica carrier pore was further removed by vacuum drying for 2 h, and then dried in an air drying oven at 8 CTC for 8 h, and then the dried sample was placed in a fluidized bed.
  • the calcination activation was carried out, and the temperature was kept at 50 CTC for 4 h under high purity air, and the silica gel was finally cooled down under nitrogen to obtain titanium dioxide modified silica gel. Then, 10 g of the titanium dioxide-modified silica gel prepared by the above method was immersed in an aqueous solution of ammonium dichromate (chromium loading of 1 wt%), and immersed for 4 hours at room temperature, then heated to 12 CTC for 6 hours, and then transferred to an oven for 6 hours. ; the dried sample was placed in a quartz fluidized bed, high purity air calcination activation 60CTC 4 h, and titanium oxide modified Phillips catalyst.
  • ammonium dichromate chromium loading of 1 wt%
  • titanium dioxide modified silica gel prepared by the above method was immersed in an aqueous solution of vanadyl oxalate (vanadium loading: 0.4 Swt%), and immersed for 5 hours at 5 CTC, dried, and then transferred to an oven for 6 hours ; the dried sample was placed.
  • vanadium loading vanadium loading: 0.4 Swt%
  • 60CTC was calcined and activated in high purity air for 4 h, and naturally cooled under nitrogen protection to obtain a supported vanadium catalyst modified by titanium dioxide.
  • the titanium dioxide-modified Phillips catalyst obtained above and the titanium oxide-modified supported vanadium catalyst are mechanically mixed under a nitrogen atmosphere at a molar ratio of Cr/V of 2:1 to obtain a mixture. The catalyst is kept for use.
  • the catalyst of 160 mg in Comparative Example 14 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated to remove impurities, and was evacuated three times with high-purity nitrogen gas, and finally the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TiBA triisobutylaluminum
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the autoclave was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • the catalyst of 160 mg in Comparative Example 14 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was heated and removed by vacuum, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TAA triethylaluminum
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the autoclave was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, and then weighed and analyzed.
  • the catalyst of 160 mg in Comparative Example 14 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • TIBA triisobutylaluminum
  • 1-hexane that is, the volume ratio of 1-hexene to the solvent used for the polymerization was 2, 4, and 6 vol%, respectively (corresponding to Comparative Examples 18-1, 18-2, and 18-3, respectively), and 30 mL of dehydration and deoxidation was further added.
  • the purified n-glycol solvent was adjusted to an ethylene pressure of 0.15 MPa.
  • the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, add 50 mL hydrochloric acid/ethanol mixed solution. Stop the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 60 ° C for 4 hours, weighed and analyzed. Comparative example
  • the catalyst of 160 mg in Comparative Example 14 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated to remove impurities, and was evacuated three times with high-purity nitrogen gas, and finally the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TiBA triisobutylaluminum
  • the catalyst of 160 mg in Comparative Example 14 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated to remove impurities, and was evacuated three times with high-purity nitrogen gas, and finally the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TIBA triisobutylaluminum
  • the 160 mg catalyst of Comparative Example 15 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • TiBA triisobutylaluminum
  • Example 55-1 226.59 Example 55-2 187.13
  • Example 56-1 228.74 Example 56-2 143.23
  • Example 57-1 543.23 Example 57-2 413.74
  • Example 58 185.10 Example 58 80.82
  • Example 60 156.18 Comparative implementation Example 16-1 207.97
  • the polymerization activity of the zirconium-containing catalyst of the present invention is calculated in units of zirconium, the same applies hereinafter. Effect of concentration of chemical on polymerization activity and product properties Table 9 Effect of cocatalyst dosage on ethylene homopolymerization catalyzed by titanium dioxide modified and unmodified supported chromium-vanadium metal oxide double-site catalyst
  • Example 39 TiBA 232.33 131.58 4.62 46.04
  • Example 58 TEA 185.10 132.02 3.14 10.61
  • Comparative Example 16-1 TiBA 207.97 131.11 4.90 43.67
  • Table 10 shows supported chrome vanadium gold modified and unmodified with titanium dioxide using different promoters.
  • the oxide double-site catalyst catalyzes the ethylene homopolymerization activity (Examples 39, 58 and Comparative Examples 16-1, 17). It can be seen that when using triisobutylaluminum (TiBA) as a cocatalyst, the activity of both catalysts is significantly higher than that of ethylene homopolymerization when using triethylaluminum (TEA) as a promoter.
  • TiBA triisobutylaluminum
  • TSA triethylaluminum
  • the polyethylene of the product under different cocatalysts has a similar melting point, but the molecular weight and molecular weight distribution are greatly different, indicating the degree of reduction of the active site of the catalyst and the reduction of the active site of the catalyst. The distribution has a greater impact.
  • Comparative Example 16-1 85 207.97 131.11 4.90 43.67
  • Table 11 shows the ethylene homopolymerization activities of the titanium dioxide-modified and unmodified supported chromium-vanadium double-site catalysts at different polymerization temperatures (Examples 39, 57 and Comparative Examples 16-1, 20).
  • the catalyst has the highest activity at 55 ° C in the polymerization temperature range of 55 ° C to 85 ° C.
  • the polymerization activity of the catalyst decreases with increasing temperature and the lowest activity at 85 ° C.
  • Polyethylene products obtained at different polymerization temperatures have similar melting points, and their molecular weights tend to decrease with increasing polymerization temperature, indicating that higher polymerization temperatures are more favorable for polymerization chain transfer.
  • Example 52-2 Example 52-3 4.2 157.81 131.98 5.95 46.01
  • Example 39 0 232.33 131.58 4.62 46.04
  • Example 53-1 1.4 199.36 131.85 6.44 44.21
  • Example 53-2 2.8 170.30 131.93 5.45 37.43
  • Example 53-3 4.2 102.53 131.83 4.83 48.25 Comparative Example 16-1 0 207.97 131.11 4.90 43.67
  • Comparison Example 18-1 1.4 189.73 131.86 3.10 10.95
  • Comparative Example 18-2 2.8 172.88 131.76 5.17 38.30
  • Comparative Example 18-3 4.2 102.62 131.15 4.62 47.61
  • Table 12 shows the activity of the titanium oxide-modified supported chromium-vanadium double-site catalyst for the polymerization of ethylene/1-hexene polymerization (Examples 38-1, 39, 52, 53 and Comparative Examples 16-1, 18). .
  • the ethylene/1-hexene copolymerization activity of the titanium dioxide-modified supported chromium-vanadium double-site catalyst showed a tendency to decrease.
  • the results of ethylene homopolymerization before the combination indicated that ethylenehexene copolymerization The activity is lower than the activity of ethylene homopolymerization.
  • Table 13 compares the activity of the titanium dioxide-modified supported chromium-vanadium double-site catalyst prepared by two titanium introduction methods (impregnation method and sol-gel method) to catalyze ethylene homopolymerization.
  • the catalysts of Examples 39 and 58 were titania-modified silica gel prepared by impregnation as a carrier, and the catalysts of Examples 43 and 60 were titania-modified silica gel prepared by a sol-gel method as a carrier.
  • Example 39 232.33 131.58 4.62 46.04
  • Example 41 198.80 131.12 4.37 43.86
  • Table 14 compares two chromium-vanadium loading modes (chromium vanadium partially impregnated on a titanium dioxide modified support and chromium vanadium co-impregnated on a titanium dioxide modified support) to prepare a titanium dioxide modified supported chromium vanadium double active center.
  • the catalyst catalyzes the activity of ethylene homopolymerization. It can be seen that the TiO2 modified supported chromium-vanadium double-site catalyst prepared by the chromium-vanadium step-by-step impregnation method has higher activity for ethylene homopolymerization than the catalyst prepared by the chromium-vanadium co-impregnation method.
  • Example 37 5 203.86 131.86 6.81 44.15
  • Example 38-1 5 227.08 132.80 6.04 39.90
  • Example 39 5 232.33 131.58 4.62 46.04
  • Table 15 shows the polymerization activities of titanium dioxide-modified supported chromium vanadium oxide double-site catalysts having different titanium dioxide contents (Examples 37, 38-1, 39 and Comparative Example 16-1).
  • the weight average molecular weight of the polyethylene product of Example 39 was lower than that of the obtained polyethylene product of Comparative Example 16-1; and the weight average molecular weight of the polyethylene product prepared in Example 37 and Example 38-1 was compared with Comparative Example 16.
  • the polyethylene product of -1 has a high molecular weight. This indicates that the introduction of titanium dioxide into the catalytic system has an effect on the active center of the catalyst. In addition, the PDI of the polymerization product is around 40, which is not significant. Variety.
  • Example 54-1 10 195.83 131.70 5.01 54.72
  • Example 54-2 20 190.65 132.29 3.52 14.92
  • Example 38-1 0 227.08 132.80 6.03 39.90
  • Example 56-1 10 228.74 132.03 3.52 14.92
  • the obtained sample was again immersed in an aqueous solution of basic chromium acetate (chromium loading was 1 wt%), and stirring was continued for 4 hours at room temperature until the reaction was completed. Then, it was dried in a 12CTC oil bath for 6 hours, transferred to a blast drying oven at 12 CTC for 8 h, and then the obtained sample was subjected to high temperature roasting in a fluidized bed, and kept at 600 ° C for 4 h in high purity air, followed by nitrogen gas. Under natural cooling, the above roasting process is shown in Figure 2. Finally, the catalyst was transferred to a glove box under nitrogen protection for storage.
  • silica gel having a pore volume of 1.5 to 1.7 cm 3 /g and a surface area of 250 to 300 m 2 /g
  • an aqueous solution of ammonium hexafluorosilicate fluorine loading of 0.75 wt%).
  • the oil bath was dried at 120 ° C for 6 hours, transferred to a blast drying oven and dried at 80 ° C for 8 h; then the dried sample was calcined and activated in a fluidized bed, and 60 CTC was kept under high purity air. 4 h, the silica gel was finally cooled down under nitrogen, and the above calcination procedure was as shown in Fig.
  • the obtained sample was again immersed in an aqueous solution of basic chromium acetate (chromium loading was 1 wt%), and stirring was continued for 4 hours at room temperature until the reaction was completed. Then, it was dried in a 12CTC oil bath for 6 hours, transferred to a blast drying oven at 12 CTC for 8 h, and then the obtained sample was subjected to high temperature roasting in a fluidized bed, and kept at 60 CTC for 4 h in high purity air, and then naturally under nitrogen. Cooling and cooling, the above roasting process is shown in Figure 2. Finally, the catalyst was transferred to a glove box under nitrogen protection for storage.
  • the obtained sample was again immersed in an aqueous solution of chromium trioxide (chromium loading was 1 wt%), and stirring was continued for 4 hours at room temperature until the reaction was completed. Then, it was dried in a 12CTC oil bath for 6 hours, transferred to a blast drying oven at 120 ° C for 8 h, and then the obtained sample was subjected to high temperature roasting in a fluidized bed, and kept at 60 CTC for 4 h in high purity air, and then under nitrogen. The natural cooling is cooled, and the above baking process is as shown in FIG. Finally, the catalyst was transferred to a glove box under nitrogen protection for storage.
  • the obtained sample was again immersed in an aqueous solution of ammonium metavanadate (vanadium loading was 0.48 wt%), and continuously stirred under 6 CTC. Mix for 4 hours until the reaction is complete. Then, it was dried in a 12CTC oil bath for 6 hours, transferred to a blast drying oven at 12 CTC for 8 h, and then the obtained sample was subjected to high temperature roasting in a fluidized bed, and kept at 45 CTC for 4 h in high purity air, and then naturally cooled under nitrogen. Cooling, the above firing process is shown in Figure 1. Finally, the catalyst was transferred to a glove box under nitrogen protection for storage.
  • the obtained sample is again immersed in an aqueous solution of basic chromium acetate (chromium loading is 1 wt%); after continuous stirring for 5 h, the 12 CTC oil bath is dried for 6 h, and transferred to a 12 CTC oven for 8 h; The dried sample was placed in a quartz fluidized bed for calcination activation, and was kept at 60 CTC for 4 h in air, and naturally cooled under nitrogen protection. The above calcination process is shown in Fig. 2. Finally, the catalyst was transferred to a glove box under nitrogen protection for storage.
  • basic chromium acetate chromium loading is 1 wt%)
  • the obtained sample was again immersed in an aqueous solution of vanadyl oxalate (vanadium loading: 0.48 wt%), continuously stirred for 4 h, dried in a 12 CTC oil bath for 6 h, and then transferred to a 12 CTC oven for 8 h; the dried sample was placed.
  • the quartz fluidized bed was calcined and activated, and kept at 50 CTC for 4 h in the air, and naturally cooled under nitrogen protection. Finally, the catalyst was transferred to a glove box under nitrogen protection for storage.
  • the obtained sample was again immersed in an aqueous solution of chromium trioxide (chromium loading was 1 wt%), and stirring was continued for 4 hours at room temperature until the reaction was completed. Then, it was dried in a 12CTC oil bath for 6 hours, transferred to a blast drying oven at 12 CTC for 8 h, and then the obtained sample was subjected to high temperature roasting in a fluidized bed, and kept at 60 CTC for 4 h in high purity air, and then naturally cooled under nitrogen. Cooling, the above firing process is shown in Figure 2. Finally, the catalyst was transferred to a glove box under nitrogen protection for storage.
  • an organometallic cocatalyst having a molar ratio of Al/Cr 20 and a concentration of 1 mol/L, methylaluminoxane, was added, followed by drying at 10 CTC for 4 hours to remove the solvent, and the drying was carried out under a nitrogen atmosphere.
  • the catalyst obtained by the prereduction activation was stored under a nitrogen atmosphere for use.
  • Example 61 160 mg of the catalyst of Example 61 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated to remove impurities, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TiBA triisobutylaluminum
  • the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer.
  • a hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • TiBA triisobutylaluminum
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the kettle was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 63 160 mg of the catalyst of Example 63 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated and removed, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TiBA triisobutylaluminum
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the kettle was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 64 160 mg of the catalyst of Example 64 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated and removed, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TiBA triisobutylaluminum
  • the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer.
  • a hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 65 160 mg of the catalyst of Example 65 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • TiBA triisobutylaluminum
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the kettle was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 66 160 mg of the catalyst of Example 66 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated and removed, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TiBA triisobutylaluminum
  • the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer.
  • a hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • TiBA triisobutylaluminum
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the kettle was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 67 160 mg of the catalyst of Example 67 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • TiBA triisobutylaluminum
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the kettle was constant at 85 ° C, the catalyst was added to start the reaction.
  • Instantaneous consumption of monomeric ethylene during on-line reaction (by connecting high-precision B to the computer) Aene mass flow meter) and recorded by computer.
  • a hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 69 160 mg of the catalyst of Example 69 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated and removed, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • 70 mL of purified n-heptanium solvent was added to the reaction vessel.
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the kettle was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 60 ° C for 4 hours, weighed and analyzed.
  • Example 67 The catalyst of 160 mg in Example 67 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • TiBA triisobutylaluminum
  • the volume ratio of 1-hexene to the solvent used for the polymerization is 1, 3, respectively (corresponding to Examples 79-1 and 79-2, respectively), and 30 mL of dehydrated and deoxidized purified n-glycol solvent is added to adjust the ethylene pressure.
  • the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene was collected online during the reaction and recorded by a computer.
  • a 50 mL hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • the obtained polymer was dried in a vacuum drying oven at 60 ° C for 4 hours, weighed and analyzed.
  • Example 67 The catalyst of 160 mg in Example 67 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the propylene is added to the reactor to a volume of 0.14 MPa.
  • TiBA triisobutylaluminum
  • 1 OmL and 20 mL of H2 were respectively added to the kettle (corresponding to Examples 80-1 and 80-2, respectively).
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the kettle was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer.
  • a hydrochloric acid/ethanol mixed solution was added to terminate the reaction.
  • filtering The obtained polymer was dried in a vacuum oven at 6 CTC for 4 h, weighed and analyzed.
  • TiBA triisobutylaluminum
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the kettle was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 63 The catalyst of 160 mg in Example 63 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • TiBA triisobutylaluminum
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the kettle was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • Example 67 The catalyst of 160 mg in Example 67 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • TIBA triisobutylaluminum
  • Example 63 160 mg of the catalyst of Example 63 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated and removed, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TSA triethylaluminum
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the kettle was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • the catalyst 160 mg of the catalyst of Example 62 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated and removed, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • 70 mL of purified n-heptanium solvent was added to the reaction vessel.
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the kettle was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 60 ° C for 4 hours, weighed and analyzed.
  • Example 67 The catalyst of 160 mg in Example 67 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated to remove impurities, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TAA triethylaluminum
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the kettle was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • the obtained sample was again immersed in an aqueous solution of basic chromium acetate (chromium loading: 1 wt%), and stirring was continued for 4 hours at room temperature until the reaction was completed. Then it was dried in 12CTC oil bath for 6h, transferred to 12CTC in blast drying oven for 8h, and then the obtained sample was calcined in high temperature in 60CTC in high-purity air for 4h, then cooled naturally under nitrogen. The above baking process is shown in FIG. 2. Finally, the obtained unmodified supported chromium-vanadium double-site catalyst was transferred to a glove box under nitrogen protection for storage.
  • basic chromium acetate chromium loading: 1 wt%
  • the obtained sample was again immersed in an aqueous solution of basic chromium acetate (chromium loading: 1 wt%), and stirring was continued for 4 hours at room temperature until the reaction was completed. Then it was dried in 12CTC oil bath for 6h, transferred to 12CTC in blast drying oven for 8h, and then the obtained sample was calcined in high temperature in 60CTC in high-purity air for 4h, then cooled naturally under nitrogen. The above baking process is shown in FIG. 2. Finally, the obtained fluorine-modified supported Phillips catalyst was transferred to a glove box under nitrogen protection for storage.
  • basic chromium acetate chromium loading: 1 wt%
  • silica gel having a pore volume of 1.5 to 1.7 cm 3 /g and a surface area of 250 to 300 m 2 /g
  • an aqueous solution of ammonium hexafluorosilicate flux loading of 1.5 wt%.
  • the oil bath was dried at 120 ° C for 6 h, then dried in a forced air oven at 80 ° C for 8 h, and then the dried sample was placed in a fluidized bed.
  • the calcination activation was carried out, and the temperature was kept at 50 CTC for 4 h in high purity air, and the silica gel was finally cooled down under nitrogen to obtain a fluorine-modified silica gel.
  • fluorine-modified silica gel prepared by the above method was immersed in an aqueous solution of vanadyl oxalate (vanadium loading: 0.96 wt%), and immersed for 5 hours at 5 CTC, dried, and then transferred to an oven for 6 hours; the dried sample was placed.
  • vanadyl oxalate vanadium loading: 0.96 wt%
  • 60CTC was calcined and activated in high purity air for 4 h, and naturally cooled under nitrogen protection to obtain a fluorine-modified supported vanadium catalyst.
  • the fluorine-modified Phillips catalyst obtained above and the fluorine-modified supported vanadium catalyst were mechanically mixed under a nitrogen atmosphere at a molar ratio of Cr/V of 2:1 to obtain a mixed catalyst for storage.
  • the catalyst of 160 mg in Comparative Example 22 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated to remove impurities, and was evacuated three times with high-purity nitrogen gas, and finally the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TiBA triisobutylaluminum
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the autoclave was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • the catalyst of 160 mg in Comparative Example 23 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated to remove impurities, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TiBA triisobutylaluminum
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the autoclave was constant at 85 ° C, the catalyst was added to start the reaction.
  • the catalyst of 160 mg in Comparative Example 24 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated to remove impurities, and was evacuated three times with high-purity nitrogen gas, and finally the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TiBA triisobutylaluminum
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the autoclave was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • the catalyst of 160 mg in Comparative Example 22 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated to remove impurities, and was evacuated three times with high-purity nitrogen gas, and finally the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TIBA triisobutylaluminum
  • the volume ratio of 1-hexene to the solvent used for the polymerization is 1, 3, respectively (corresponding to Comparative Examples 29-1 and 29-2, respectively), and 30 mL of dehydrated and deoxidized purified n-glycol solvent is used to adjust the ethylene. Pressure to 0.15 MPa. After the temperature in the autoclave was constant at 85 ° C, the catalyst was added to start the reaction. The instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a 50 mL hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 60 ° C for 4 hours, weighed and analyzed.
  • the catalyst of 160 mg in Comparative Example 24 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • TIBA triisobutylaluminum
  • the volume ratio of 1-hexene to the solvent used for the polymerization is 1, 3, respectively (corresponding to Comparative Examples 30-1 and 30-2, respectively), and 30 mL of dehydrated and deoxidized purified n-glycol solvent is added to adjust the ethylene. Pressure to 0.15 MPa. After the temperature in the autoclave was constant at 85 ° C, the catalyst was added to start the reaction. Instantaneous consumption of monomeric ethylene during on-line reaction (high-precision ethylene mass flow through a computer) And recorded by computer. After lh, a 50 mL hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 60 ° C for 4 hours, weighed and analyzed.
  • the catalyst of 160 mg in Comparative Example 22 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated to remove impurities, and was evacuated three times with high-purity nitrogen gas, and finally the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the kettle was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, weighed and analyzed.
  • the catalyst of 160 mg in Comparative Example 24 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated to remove impurities, and was evacuated three times with high-purity nitrogen gas, and finally the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • the catalyst of 160 mg in Comparative Example 22 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • TiBA triisobutylaluminum
  • the catalyst of 160 mg in Comparative Example 24 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was vacuum-heated to remove impurities, and was evacuated three times with high-purity nitrogen gas, and finally the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TIBA triisobutylaluminum
  • the catalyst 160 mg of Comparative Example 22 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was heated and removed by vacuum, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TSA triethylaluminum
  • the ethylene pressure was adjusted to 0.15 MPa, and after the temperature in the autoclave was constant at 85 ° C, the catalyst was added to start the reaction.
  • the instantaneous consumption of monomeric ethylene (by a high-precision ethylene mass flow meter connected to a computer) was collected online during the reaction and recorded by a computer. After lh, a hydrochloric acid/ethanol mixed solution was added to terminate the reaction. After filtration, the obtained polymer was dried in a vacuum oven at 6 CTC for 4 hours, and then weighed and analyzed.
  • the polymerization reactor was vacuum-heated to remove impurities, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TAA triethylaluminum
  • the catalyst of 160 mg in Comparative Example 25 was weighed and subjected to an atmospheric pressure polymerization experiment.
  • the polymerization reactor was heated and removed by vacuum, and was evacuated three times with high-purity nitrogen gas. Finally, the reactor was charged with a trace amount of refined ethylene to 0.12 MPa.
  • TiBA triisobutylaluminum
  • Example 80-2 83.4 Example 81-1 62.3 Example 81 - 2 51.4 Example 82-1 81.2 Example 82-2 75.4 Example 83-1 315.2 Example 83-2 243.7 Example 84 78.5 Example 85 31.6 Example 86 93.2 Comparative Example 26-1 149.0 Comparative Example 26-2 114.4 Comparative Example 26-3 87.5 Comparative Example 264 83.4 Comparative Example 26-5 71.4 Comparative Example 27-1 96.5 Comparative Example 27-2 51.2 Comparative Example 27-3 39.4 Comparative Example 274 32.3 Comparative Example 27-5 22.8 Comparative Example 28-1 131.6 Comparative Example 28-2 100.3 Comparative Example 28-3 77.7 Comparative Example 284 64.1 Comparative Example 28 -5 66.3 Comparative Example 29-1 114.3 Comparative Example 29-2 97.3 Comparative Example 30-1 104.5
  • the polymerization activity of the zirconium-containing catalyst of the present invention is calculated in units of zirconium, the same applies hereinafter. Effect of cocatalyst concentration on polymerization activity and product properties
  • Example 76-1 2.5 105.1 131.2 5.21 22.7
  • Example 76-3 10 55.0 132.4 7.98 34.3
  • Example 76-4 15 50.6 132.7 7.15 28.5
  • Comparative Example 26 -1 2.5 149.0 131.2 4.40 25.5 Comparative Example 26-2 5 114.4 131.9 4.79 26.
  • Table 19 shows the catalyzed ethylene homopolymerization activity of a fluorine-modified and unmodified supported chromium-vanadium metal oxide double-site catalyst with an unmodified phillips catalyst using different cocatalysts (Examples 76-1, 86 and Comparative Examples 26-1, 35, 28-1, 36). It can be seen that using triisobutylaluminum (TiBA) as a help At the time of the catalyst, the activities of the two catalysts were significantly higher than those of the ethylene tetraglycol (TEA) as a cocatalyst.
  • TiBA triisobutylaluminum
  • the polyethylene of the product under different cocatalysts has a similar melting point, but the molecular weight and molecular weight distribution are greatly different, indicating the degree of reduction of the active site of the catalyst and the reduction of the active site of the catalyst. The distribution has a greater impact.
  • Example 83-1 45 315.2 131.7 10.12 21.5
  • Example 83-2 65 243.7 130.8 9.89 20.9
  • Example 76-1 85 105.1 131.2 9.01 22.7 Comparative Example 33-1 45 140.3 134.1 6.36 21.9 Comparative Example 33-2 65 226.5 131.1 5.90 22.9
  • Comparative Example 26-1 85 149.0 131.2 5.76 25.5
  • Comparative Example 34-1 45 162.7 133.5 6.18 20.6
  • Table 20 shows the ethylene homopolymerization activity of fluorine-modified and unmodified supported chromium-vanadium metal oxide double-site catalysts and unmodified phillips catalysts at different polymerization temperatures (Examples 83-1 83-2 76-1) And Comparative Examples 33-1 33-2, 26-1, 34-1 34-2, 28-1).
  • the polyethylene products obtained at different polymerization temperatures have similar melting points.
  • the molecular weight of the fluorine-modified supported chromium-vanadium metal oxide double-site catalyst decreases with the increase of polymerization temperature, indicating that the polymerization temperature rises. Polymerization chain transfer is more advantageous.
  • Table 21 shows the activity of the fluorine-modified and unmodified supported chromium-vanadium metal oxide double-site catalysts, unmodified phillips catalysts for the polymerization of ethylene hexene (Examples 76-1, 79-1, 79-2). And Comparative Examples 26-1, 29-1, 29-2, 28-1, 30-1, 30-2).
  • the ethylene/1-hexene copolymerization activity of the fluorine-modified supported chromium-vanadium metal oxide double-site catalyst showed a decreasing trend, and the ethylene homopolymerization result showed that ethylene
  • the /1-hexene copolymerization activity is lower than the activity of ethylene homopolymerization.
  • the molecular weight of the polymer decreases.
  • Example PDI amount (mL) (kg PE / molCr h) O sub-quantity ( ⁇ 5 )

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Abstract

本发明涉及一种负载型金属氧化物双活性中心乙烯聚合催化剂及其制备方法与应用,所述的催化剂组成包括无机载体和负载的两种活性组分,两种活性组分包括铬氧化物和钒氧化物;所述催化剂还包括改性组分,改性组分选自二氧化钛和氟中的一种。本发明还提供了该催化剂的制备方法:将钛或氟化合物、钒盐和铬盐按比例、不同的顺序和方法负载在无机载体上,经过高温焙烧得到,还可进一步加入有机金属助催化剂对其预还原活化处理。本发明的负载型金属氧化物双活性中心乙烯聚合催化剂是一种高效制备聚乙烯的催化剂,可用于制备乙烯的均聚物或乙烯与α-烯烃的共聚物。该催化剂具有催化活性高、氢调敏感性和共聚性能好、聚乙烯产品分子量分布宽等优点。

Description

一种负载型金属氧化物双活性中心乙烯聚合催化剂 及其制备方法与应用
技术领域 本发明属于烯烃聚合催化剂领域, 具体涉及一种负载型金属氧化物双活性 中心乙烯聚合催化剂及其制备方法与说应用。
背景技术
聚乙烯 (PEM乍为一种通用的塑料, 由于其书优良的力学性能、 电绝缘性、 耐 化学腐蚀性及耐低温性能, 广泛应用于工业、 农业、 汽车、 通讯以及日常生活 的各个领域, 这些具有优良性能的聚乙烯产品与所使用的催化剂有着密切的关 系。 Phillips 铬系催化剂生产着世界上 40%左右的高密度聚乙烯, 由于其产品 带有少量的长支链, 因而具有独特的流变和加工性能, 特别适用于加工大型中 空容器、 耐长期静压的燃气管和给水管、 汽车油箱等, 且这些产品目前还无法 被 Ziegler-Natta催化剂、 新型茂金属催化剂和后过渡金属聚烯烃催化剂的产品 所替代。 目前, Phillips催化剂己经在聚烯烃工业生产中有着非常重要的地位, 近年来我国也加大了 Phillips聚乙烯工艺和装置技术的引进力度。
Phillips催化剂最早是由 Phillips石油公司的 J.P Hogan和 R丄. Bank两名研 究员在专利 US2825721中报道的。该专利以氧化铬为原料, 研究了在不同条件 下, 包括聚合温度、 聚合时间、 单体浓度与催化剂用量之比、催化剂的载铬量、 载体改性、 催化剂制备条件等, 对 Phillips催化剂催化烯烃聚合性能的影响。 后来, US4295997、 US4528338, US5401820发展了 Phillips催化剂, 比如采用 低毒性的三价铬盐为原料, 以避免使用高毒害性的 Cr03原料。
传统的钒系催化剂用在均相 Ziegler-Natta催化剂乙烯聚合体系中, 主要用 于调节 Ziegler-Natta催化剂产品的分子量分布和共聚单体的分布情况, 来提高 产品性能, 表现在: 生产的聚合物分子量分布较窄、分子量较高; 生产乙炼 / (X- 烯烃共聚物, 且共聚单体插入量较多; 还可合成间规聚丙烯等。 Zakharov等考 察了将 VC 负载在 MgCl2载体上制备催化剂的聚合性能, 发现该催化剂可生 产宽分子量分布的聚乙烯, 且对氢调有很高的响应值, 可参见文献 Chinese Journal of Polymer Science, 2008, 26, 553-559。 专利 US4199475报导了将钛酸四 乙酯以及三氯氧钒负载在硅胶上制备的催化剂, 具有很高的乙烯聚合活性。
由于 Phillips催化剂对载体组成变化高度敏感, 因此可通过改变载体的组 成或载体的类型, 生产液态的低聚物和低分子量的蜡状物或者超高分子量聚乙 烯 (UHMWPE) , 其产品的分子量分布可在很大范围内调控。 第二代 Phillips 催化剂的两个共同特征是: 1 ) 通过对载体的表面改性来制备具有新性能的催 化剂和聚乙烯产品; 2) 铬是改性 Phillips 催化剂中的唯一活性组分。 第二代 Phillips催化剂的载体改性方法包括: 二氧化钛改性、 氧化镁改性、 氟改性、 氧 化铝改性、 碱金属改性、 硼改性等。 目前, 第二代改性 Phillips催化剂己经用 来生产各种商业用途的不同等级的聚合物。
其中, 催化剂的载体经二氧化钛改性后, 能够显著的增强铬的活性, 缩短 诱导时间, 提高催化剂的聚合活性和链终止速率, 降低聚合物的平均分子量, 这对聚合来说通常是有利的。 Phillips 公司的 R.Dietz ( US3887494 ) , B. Horvath(US3622521)和 Chemplex Company 公司的 T. Pullukat (US378001)均进 行了这方面的研究, 两个公司所用的载体分别为美国 Grace公司的 Davison系 列和现为 PQ公司生产的聚烯烃专用硅胶载体。 引入二氧化钛的方式主要有两 种, 一种是钛和硅以共凝胶 (co-gel) 的方式沉积后再成型, 载体主体相和表 面的 Ti含量相当; 一种是二氧化钛涂敷于己成型的硅胶载体上,此时二氧化钛 主要分布在载体的表面。 相关文献可参见 Journal of Catalysis, 1983,82, 118-126。
其中, 氟改性采用表面氟改性剂如六氟硅酸铵等会与表面的硅羟基团反应 释放出水, 同时在硅胶表面形成 Si-F键。改性硅胶表面上电负性更强的 F原子 会引起周围原子上的电子转移, 从而削弱了硅羟基键, 藉此增加了硅胶表面的 酸性, 相关文献可参见 Journal of Catalysis, 2(2), 145, 1963。 Rebenstrof等人对 未经改性和经过 F改性的两种 Phillips催化剂进行了傅里叶红外光谱表征, 发 现 F改性催化剂的表面硅羟基伸缩振动峰(3746 cm-1 )的强度明显下降, 表明 F有利于除去硅胶表面的硅羟基团。 另外作者认为在 80CTC下仍未脱除的 OH 基团所连接的 Si原子上不会同时与 F原子成键。之后, 利用低温 CO红外光谱 表征发现, 经过六氟硅酸铵的表面改性之后, Cr原子周围的电子云密度降低, 同时, 活性中心的分布得到了改善, 相关文献可参见 Journal of Molecular Catalysis, 66(1), 59, 1991。
Hogan的一个早期专利中指出 Phillips催化剂的氟改性可采用以下两种方 式实现: (1 ) 向己经干燥过的 Phillips 催化剂中直接混入 (NH4)2SiF6; ( 2) 将 (NH4)2SiF^D Cr03的溶液共浸渍在硅胶表面。 聚合结果表明, 不论是乙烯均聚 反应, 还是乙烯与丙烯、 1-丁烯、 1-戊烯、 1-辛烯等 α-烯烃的共聚反应, 共浸 渍法制得的氟改性催化剂的催化活性比粉末混合法的要高。当采用硅胶-氟作为 载体时, 随着体系中六氟硅酸铵的加入量从 0.5 wt.% 更高到 3.5 wt.%, 表观聚 合活性表现出逐渐升高的趋势, 且氟的引入对聚合产物的密度具有明显的调节 作用, 表明氟能够促进共聚单体的插入反应。 Kallenbach (US: 3 445 367, 1969) 使用了直接干混法将四种不同氟化合物 (NH4)2SiF6、 CuSiF6、 N BF6和 CuBF6 对 Phillips催化剂进行改性, 对比传统 Phillips催化剂, 这些 F改性的催化剂都 能够生产出相对分子量分布更窄的 HDPE。
McDaniel将原始硅胶浸渍在 (> )^?6溶液中, 之后分别在 420、 650和 87CTC三个温度下焙烧, 再用这种氟化处理的硅胶用 Cr〇3的 C CN溶液浸渍, 最后于空气中将催化剂高温活化。 研究人员在不同焙烧温度下对不同 F含量的 催化剂样品进行活化, 发现经过氟改性的催化剂, 其 Cr(VI)的饱和负载量有所 降低。 在同样的焙烧温度下, Cr(VI)最大的负载量随着 F负载量的加大而急速 下降, 且 87CTC的样品下降最多, 这表明高温下氟化物可能会加速硅胶的烧结。 相关文献可参见 Journal of Catalysis, 76(1), 37, 1982。
目前, 尚无相关采用负载型钒氧化物作为烯烃聚合反应活性中心的报道, 也没有将负载型钒氧化物作为活性组分引入 Phillips铬系催化剂的相关报道; 同样也没有关于二氧化钛改性的或者氟改性的负载型铬钒金属氧化物双活性 中心聚乙烯催化剂的报道, 本发明即在负载型铬钒金属氧化物双活性中心聚乙 烯催化剂的基础上进一步引入改性组分二氧化钛或者氟。 发明内容
本发明的目的在于提供一种负载型金属氧化物双活性中心乙烯聚合催化 剂及其制备方法与应用, 该催化剂是一种高效合成乙烯均聚物和乙烯与 0C-烯烃 共聚物的新型铬钒双活性中心催化剂, 使其生产的聚乙烯在保证分子量分布宽 的前提下, 改善共聚单体的含量及其分布, 使其在低分子量端插入量减少, 而 在高分子量端插入量增多, 从而易形成更多的系带分子, 开发出性能更好的聚 乙烯产品, 同时催化剂还具有较高的活性、 氢调响应性能等。
本发明的技术方案如下- 本发明提供一种负载型金属氧化物双活性中心乙烯聚合催化剂, 所述的催 化剂组成包括无机载体和负载的两种活性组分, 所述两种活性组分包括铬氧化 物和钒氧化物。
本发明提供一种负载型金属氧化物双活性中心乙烯聚合催化剂, 所述催化 剂还包括改性组分; 所述改性组分选自二氧化钛和氟中的一种。
本发明提供一种负载型金属氧化物双活性中心乙烯聚合催化剂, 目的是制 备一种将铬、 钒氧化物负载在无机载体上的双活性中心乙烯聚合催化剂。 本发 明还提供了该负载型铬钒双活性中心催化剂在乙烯均聚和乙烯与 0C-烯烃共聚 中的应用。
本发明所述无机载体选自二氧化硅、 三氧化二铝、 二氧化钛、 氧化锆、 氧 化镁、氧化钙、无机粘土和它们的组合, 所述无机粘土可以包括例如蒙脱石等。 根据本发明的一个实施方案,所述无机载体选自硅胶,特别是无定型多孔硅胶。 这些载体是本领域公知的, 可以商购或通过己知的方法合成。 作为硅胶的一个 例子, 可以提及 Davison 955。
根据本发明的一个实施方案, 所用无机载体的比表面积通常在 50~500 m2/g, 优选 100~300 m2/g, 无机载体的孔体积为 0.1~5.0 cm3/g, 优选 0.5~3.0 cm3/g。本发明中使用的无机载体可以是通常用于烯烃聚合催化剂制备中的任何 无机载体。
本发明催化剂的双活性中心由催化剂无机载体表面负载的钒氧化物和铬 氧化物提供。 钒的来源有水溶性含钒盐: 如六氟钒酸铵、 硝酸钒、 草酸氧钒、 偏钒酸铵、 硫酸氧钒、 硫酸氧化钒 (IV)水合物、 硫酸钒 (111)、 三氯代氧化钒、 原 钒酸钠、 偏钒酸钠等, 以及非水溶性含钒盐: 如双乙酰丙酮氧化钒、 三异丙醇 氧钒、 三丙醇氧化钒、 乙酰丙酮钒、 氧化三乙氧基钒、 氯化氧钒、 硅化三钒、 其它合适的可溶性钒盐以及它们的组合。 所用铬源选自三氧化铬、 硝酸铬、 醋 酸铬、 氯化铬、 硫酸铬、 铬酸铵、 重铬酸铵、 碱式醋酸铬、 其它合适的可溶性 铬盐以及它们的组合。 对于本发明的催化剂, 在无机载体上铬的负载量一般为催化剂总重量的
0.01~10wt% , 优选 0.05~5wt%, 按铬的重量计。
根据本发明的一个实施方案, 在无机载体上钒的负载量一般为铬负载量的 10-500% (均以铬和钒的重量计), 优选为 20~400%, 钒负载量一般为催化剂 总重量的 0.01~10wt°/。, 优选 0.05~5wt%。
根据本发明的一个实施方案, 用于制备二氧化钛改性组分的钛化合物原料 为乙酰丙酮氧钛、 三氯化钛、 四氯化钛、 叔丁醇钛、 钛酸四正丁酯、 硫酸氧钛、 硫酸钛、 六氟钛酸铵、 钛酸异丙酯、 钛酸四乙酯、 其它合适的可溶性钛盐以及 它们的组合。
对于本发明的催化剂, 其钛负载量一般为催化剂总重量的 0.01~30wt%, 优选 0.05~20wt%, 按 Ti的重量计。
根据本发明的一个实施方案, 用于制备氟改性组分的原料可选氟化氢和氟 等气体, 或者氟化铵、 双氟化铵、 氟硼酸铵、 氟硼酸铜、 氟硼酸银、 氟硼酸 金、 氟硅酸铜、 氟硅酸铜、 氟硅酸银、 氟硅酸金、 氟硼酸铵和六氟钒酸铵 、 六氟硅酸铵、 氟硼酸锌、 氟硅酸镁、 氟硅酸锌、 氟硼酸钠、 其他合适的可溶性 氟盐以及它们的组合。
对于本发明的催化剂, 其氟负载量一般为催化剂总重量的 0.01-10 wt %, 优选 0.5-5wt %, 按 F的重量计。
根据本发明的一个方面, 本发明提供制备负载型金属氧化物双活性中心乙 烯聚合催化剂的方法, 其中一种方法包含如下步骤- i ) 将无机载体浸渍含有钒的溶液, 然后干燥, 接着在高温 300~900°C下 焙烧活化;
ϋ ) 将步骤 i ) 所得的产物浸渍含有铬的溶液, 然后干燥, 接着在高温 300~900°C下焙烧活化, 得到所述催化剂保存备用。
根据一个优选的制备负载型金属氧化物双活性中心乙烯聚合催化剂的方 法, 包含如下步骤:
i ) 将钒的盐溶液浸渍在无机载体上, 浸渍时间为 l~12h, 优选 4~8h, 浸 渍温度为 10~80°C, 优选 20~70°C, 然后在 90~250°C下干燥, 优选 100~200°C, 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以采用真空干燥; 将上述样品 在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧温度在 300~900°C, 优选 400~800°C, 时间为 l~10h, 优选 4~6h, 然后进行冷却, 其中在冷却到 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却;
ii )将铬的盐溶液浸渍在上述负载有钒的无机载体上,浸渍时间为 l~12h, 优选 4~8h, 浸渍温度为 10~80°C, 优选 15~60°C, 然后在 90~250°C之间干燥, 优选 100~150°C, 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以采用真空; 将上述样品在惰性气体或者氧气或者空气中进行焙烧活化, 焙烧温度在 300-900 °C , 优选 400~800°C, 时间为 l~10h, 优选 3~8h, 然后进行冷却, 在冷 却至 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却, 得到所述催化 剂保存备用。
一般地, 本发明是利用无机化合物作为载体, 先将钒源浸渍于其上, 然后 高温焙烧, 制得负载钒的催化剂母体; 然后在含有上述催化剂母体的溶液中, 加入无机铬源进行负载, 从而制备负载型铬钒双活性中心催化剂。
上述步骤 i) 是将钒源负载于无机载体 (例如上文所述的无机载体) 上的 方法。 用于将钒源负载于无机载体上的方法可以是己知的任何可以将钒负载于 载体上的方法。 根据本发明的一个实施方案, 将钒源负载于无机载体上的方法 包括用钒源溶液浸渍多孔无机载体。 根据一个实施方案, 在浸渍过程中, 可以 实施搅拌, 优选连续搅拌。 一般地, 该搅拌持续约 l~12h, 优选约 4~8h, 浸渍 温度为 10~80°C, 优选 20~70°C。 根据一个实施方案, 钒负载量为催化剂总重 量的 0.01~10wt%, 优选约 0.05~5wt%。然后将得到的负载有钒组分的载体进行 干燥。 该干燥通常在室温〜 25CTC进行, 优选在约 90~250 °C, 进一步优选约 100~200°C。 根据一个实施方案, 该干燥在约 12CTC进行。 该干燥亦可在真空条 件下进行。对该干燥进行的时间没有特别限定, 但是该干燥通常持续约 6~20h, 优选约 7~18h, 进一步优选约 8~15h。 在干燥完毕之后, 将负载有钒组分的无 机载体进行焙烧。 对焙烧进行的方式没有特别限定, 但是该焙烧优选在流化床 内进行。 根据一个实施方案, 该焙烧通常以两个阶段进行, 即低温阶段和高温 阶段。 低温阶段通常在约 100~300°C进行。 该高温阶段通常在约 300~900°C进 行。 不受任何理论限制, 在所述低温阶段载体中吸附的物理水基本被除去, 而 在所述高温阶段无机载体上的部分羟基被除去。 根据一个实施方案, 所述低温 阶段持续 1~10小时, 优选 2~9小时, 更优选 3~8小时。 根据另一个实施方案, 所述高温阶段持续 1~10小时, 优选 2~9小时, 更优选 3~8小时。 根据一个实 施方案, 所述低温阶段在惰性气体或者空气气氛下进行, 优选在惰性气体气氛 下进行, 所述惰性气体例如是氮气、 氦气、 氩气等气氛, 优选在氮气气氛下进 行, 例如高纯氮气。 根据一个实施方案, 所述高温阶段焙烧在空气或者氧气条 件下进行, 优选在干燥空气条件下进行。 在所述焙烧结束后, 将得到的负载有 无机氧化物形式钒的无机载体从高温阶段冷却。 根据一个实施方案, 在冷却到
300~400°C的温度时, 可以变换气氛, 例如从空气变为惰性气体, 例如氮气、 氩气等。 根据一个实施方案, 该冷却为自然降温冷却。
上述步骤 ii ) 是将无机铬源负载于步骤 i) 中制备的负载有钒的无机载体 (例如上文所述的无机载体) 上的方法。 用于将无机铬源负载于预先载有钒的 无机载体上的方法可以是本领域技术人员己知的任何可以将铬负载于载体上 的方法, 例如可以提及常规己知的制备 Phillips催化剂的方法。 所述无机铬源 可以是上文所述的无机铬源。 根据一个实施方案, 在浸渍过程中, 可以实施搅 拌, 优选连续搅拌。 一般地, 该搅拌持续约 1~约 12小时, 优选约 4~8小时。 根据一个实施方案, 无机铬的负载量为催化剂总重量的约 0.01~约 10wt%, 优 选约 0.05~5wt%, 进一步优选约 0.1~3wt%。 然后将得到的载体进行干燥。 该 干燥通常在大约室温到 200°C的温度进行; 例如在大约 15°C到 25CTC进行, 优 选在约 9CTC到 250°C, 进一步优选约 10CTC到 200°C。 根据一个实施方案, 该 干燥在约 12CTC进行。 对该干燥进行的时间没有特别限定, 但是该干燥通常持 续约 6~20小时, 优选约 7~18小时, 进一步优选约 8~15小时。 在干燥完毕之 后, 将负载上金属的无机载体进行焙烧。 对焙烧进行的方式没有特别限定, 但 是该焙烧优选在流化床内进行。 根据一个实施方案, 该焙烧通常以两个阶段进 行, 即低温阶段和高温阶段。 该低温阶段通常在约 100~300°C进行。 该高温阶 段通常在约 300~900°C进行。 不受任何理论限制, 相信在所述低温阶段载体中 吸附的物理水被除去, 而在所述高温阶段无机载体上的部分羟基被除去。 根据 一个实施方案, 所述低温阶段持续 1~10小时, 优选 2~8小时。 根据另一个实 施方案, 所述高温阶段持续 1~10小时, 优选 2~9小时, 更优选 3~8个小时。 根据一个实施方案, 所述低温阶段在惰性气体或者空气气氛下进行, 优选在惰 性气体下进行, 所述惰性气体例如氮气、 氦气、 氩气等气氛, 优选在氮气气氛 下进行, 例如高纯氮气。 根据一个实施方案, 所述高温阶段焙烧在空气或者氧 气条件下进行, 优选在干燥空气条件下进行。 在所述焙烧结束后, 将得到的负 载上金属的无机载体从高温阶段冷却。 根据一个实施方案, 在高温焙烧之后冷 却到 300~400°C的温度时, 可以变换气氛, 例如从空气变为惰性气体, 例如氮 气等。 根据一个实施方案, 该冷却为自然降温冷却。 将得到的催化剂在惰性气 体气氛下保存备用。
作为一个实例, 制备本发明催化剂的具体操作包括- 将多孔无定形硅胶浸渍在一定浓度的偏钒酸铵溶液中, 钒负载量相对于催 化剂总重量符合本文的要求(例如 0.1~10wt%, 以钒的重量计); 在连续搅拌一 定时间 (例如 4~8小时) 后, 升温干燥; 将负载有偏钒酸铵的硅胶载体在流化 床内进行高温焙烧, 其中在低温阶段 (例如 100°C~300°C ) 在氮气气氛中焙烧 脱除载体中的物理水, 在高温阶段 (例如 300°C~900°C ) 在干燥空气中焙烧脱 除硅胶表面的部分羟基, 在此高温阶段保持一定时间 (例如 3~8个小时); 自 然降温冷却, 在冷却到 300~400°C时切换为氮气保护, 制得载钒的催化剂母体。 然后, 将无机铬源负载在由上述方法制得的催化剂母体上, 铬负载量符合本文 的要求(例如为催化剂总重量的 0.1~lwt%, 以铬的重量计)连续搅拌一定时间 (例如 4~8小时) 后, 升温干燥; 然后在流化床内进行高温焙烧, 其中在低温 阶段 (例如 100°C~300°C ) 在氮气气氛中焙烧脱除硅胶载体中吸附的物理水, 在高温阶段(例如 300°C~900°C )在干燥空气中焙烧脱除硅胶表面的部分羟基, 在此高温阶段保持一定时间 (例如 3~8 个小时); 自然降温冷却, 在冷却到 300~400°C时切换为氮气保护, 在氮气保护下转移, 催化剂保存备用。 本发明提供负载型金属氧化物双活性中心乙烯聚合催化剂的一种制备方 法包含如下步骤:
i ) 将无机载体浸渍含有钒和铬的溶液, 然后干燥;
ii ) 将 i ) 所得的产物在高温 300°C~900°C下焙烧活化, 得到所述催化剂 保存备用。
根据一个优选的制备负载型铬钒双活性中心催化剂的方法包含步骤- i )将含有铬钒的混合盐溶液通过共浸渍的方法负载在无机载体上, 浸渍 时间为 l~12h,优选 4~8h,浸渍温度为 10~80°C,优选 20~70°C,然后在 90~250 °C之间干燥, 优选 100~200°C, 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可 以采用真空; ϋ )将上述样品在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧 温度在 300~900°C, 优选 400~800°C时间为 l~10h, 优选 3~8h, 然后进行冷却, 在冷却至 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却, 得到所述 催化剂保存备用。
上述步骤 i ) 是将无机钒源和钒源同时负载于无机载体(例如上文所述的 无机载体) 上的方法。 所述无机铬源可以是上文所述的无机铬源, 钒源可以是 上文所述的任何钒源。根据一个实施方案,在浸渍过程中, 可以实施加热搅拌, 优选连续加热搅拌。 一般地, 该搅拌持续约 1~12小时, 优选约 4~8小时, 浸 渍温度为 10~80°C, 优选 20~70°C。 根据一个实施方案, 无机铬的负载量为催 化剂总重量的 0.01~10wt%, 优选 0.05~5wt%, 进一步优选 0.1~2wt%。 钒负载 量为催化剂总重量的 0.01~10wt%, 优选约 0.05~5wt%。然后将得到的载体进行 干燥。 该干燥通常在大约室温到 25CTC的温度进行; 优选 9CTC到 250°C, 进一 步优选 10CTC到 200°C。 对该干燥进行的时间没有特别限定, 但是该干燥通常 持续约 6~20小时, 优选约 7~18小时, 进一步优选约 8~15小时。
上述步骤 ii ) 是在干燥完毕之后, 将浸渍有铬和钒化合物的无机载体进行 焙烧, 并最终将铬钒氧化物负载于无机载体表面。 对焙烧进行的方式没有特别 限定, 但是该焙烧优选在流化床内进行。 根据一个实施方案, 该焙烧通常以两 个阶段进行, 即低温阶段和高温阶段。 该低温阶段通常在约 100~300°C进行。 该高温阶段通常在约 300~900°C进行。 不受任何理论限制, 相信在所述低温阶 段载体中吸附的物理水被除去, 而在所述高温阶段无机载体上的部分羟基被除 去。 根据一个实施方案, 所述低温阶段持续 1~10小时, 优选 2~9个小时。 根 据另一个实施方案, 所述高温阶段持续 1~10个小时, 优选 2~9个小时, 更优 选 3~8个小时。 根据一个实施方案, 所述低温阶段在惰性气体或者空气气氛下 进行, 优选在惰性气体下进行, 所述惰性气体例如氮气、 氦气、 氩气等气氛, 优选在氮气气氛下进行, 例如高纯氮气。 根据一个实施方案, 所述高温阶段焙 烧在空气或者氧气条件下进行, 优选在干燥空气条件下进行。 在所述焙烧结束 后, 将得到的负载上金属氧化物的无机载体从高温阶段冷却。 根据一个实施方 案, 在高温焙烧之后冷却到 300~400°C的温度时, 可以变换气氛, 例如从空气 变为惰性气体, 例如氮气。 根据一个实施方案, 该冷却为自然降温冷却。 将得 到的催化剂在惰性气体气氛下保存备用。 作为一个实例, 制备本发明催化剂的具体操作包括- 将多孔无定形硅胶浸渍在一定浓度的偏钒酸铵和碱式醋酸铬的水溶液中, 钒和铬的负载量相对于催化剂总重量符合本文的要求(例如钒 0.1~10 wt%, 铬 0.1-2 wt% ); 在连续搅拌一定时间 (例如 4~8小时) 后, 升温干燥; 然后在流 化床内进行高温焙烧, 其中在低温阶段 (例如 100°C~300°C ) 在氮气气氛中焙 烧脱除载体中吸附的物理水, 在高温阶段 (例如 300°C~900°C ) 在干燥空气中 焙烧脱除硅胶表面的部分羟基,在此高温阶段保持一定时间(例如 3~8个小时); 自然降温冷却, 在冷却到 300~400°C时切换为氮气保护, 在氮气保护下转移, 催化剂保存备用。 本发明提供负载型金属氧化物双活性中心乙烯聚合催化剂的另一种制备 方法包含如下步骤:
i ) 将无机载体浸渍含有铬的溶液, 然后干燥, 接着在高温 300°C~900°C 下焙烧活化;
ϋ )将步骤 i )所得的产物浸渍含有钒的溶液,然后干燥,接着在高温 300 °C~900°C下焙烧活化, 得到催化剂保存备用。
根据一个优选的制备负载型铬钒双活性中心催化剂的方法包含如下步骤- i ) 将铬的盐溶液浸渍在无机载体上, 浸渍时间为 l~12h, 优选 4-8h, 浸 渍温度为 10~80°C, 优选 20~70°C, 然后在 90~250°C之间干燥, 优选 100~150 V , 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以采用真空; 将上述样品 在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧温度在 300~900°C, 优选 400~800°C, 时间为 l~10h, 优选 3~8h, 然后进行冷却, 在冷却至 300~400 °( 时切换成惰性气体如氮气或氩气等, 自然冷却,得到负载有铬的催化剂母体; ii )将钒的盐溶液浸渍到上述负载有铬的无机载体上,浸渍时间为 l~12h, 优选 3-8h, 浸渍温度为 10~80°C, 优选 20~70°C, 然后在 90~250°C之间干燥, 优选 100~150°C, 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以采用真空; 将上述样品在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧温度在 300-900 °C , 优选 400~800°C, 时间为 l~10h, 优选 3~8h, 然后进行冷却, 在冷 却至 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却, 得到所述催化 剂保存备用。 上述步骤 i ) 是将无机铬源负载于无机载体 (例如上文所述的无机载体) 上的方法。 用于将无机铬源负载于无机载体上的方法可以是本领域技术人员己 知的任何可以将铬负载于载体上的方法,例如可以提及常规己知的制备 Phillips 催化剂的方法。所述无机铬源可以是上文所述的无机铬源。根据一个实施方案, 在浸渍过程中, 可以实施搅拌, 优选连续搅拌。 一般地, 该搅拌持续约 1~12 小时, 优选约 4~8小时。 根据一个实施方案, 铬的负载量为催化剂总重量的约 0.01~10wt% , 优选约 0.05~5wt%, 进一步优选约 0.1~2wt%。 然后将得到的载 体进行干燥。 该干燥通常在大约室温到 20CTC的温度进行; 例如在 15°C到 200 °C进行, 优选 2CTC到 200°C, 进一步优选 100°C到 200°C。 根据一个实施方案, 该干燥在约 12CTC进行。 对该干燥进行的时间没有特别限定, 但是该干燥通常 持续约 6~20小时, 优选约 7~18小时, 进一步优选约 8~15小时。 在干燥完毕 之后, 将负载上金属的无机载体进行焙烧。 对焙烧进行的方式没有特别限定, 但是该焙烧优选在流化床内进行。 根据一个实施方案, 该焙烧通常以两个阶段 进行, 即低温阶段和高温阶段。 该低温阶段通常在约 100~300°C进行。 该高温 阶段通常在约 300°C~900°C进行。 不受任何理论限制, 相信在所述低温阶段载 体中吸附的物理水被除去, 而在所述高温阶段无机载体上的部分羟基被除去。 根据一个实施方案, 所述低温阶段持续 1~10小时, 优选 2~9小时。 根据另一 个实施方案, 所述高温阶段持续 1~10小时, 优选 2~9小时, 更优选 3~8小时。 根据一个实施方案, 所述低温阶段在惰性气体或者空气气氛下进行, 优选惰性 气体气体, 更优选在氮气气氛下进行, 例如高纯氮气。 根据一个实施方案, 所 述高温焙烧阶段在在惰性气体或者空气中进行, 优选干燥高纯空气。 在所述焙 烧结束后, 将得到的负载上金属的无机载体从高温阶段冷却。 根据一个实施方 案, 在高温焙烧之后冷却到 300~400°C的温度时, 可以切换气氛, 例如从空气 变为惰性气体, 例如氮气。 根据一个实施方案, 该冷却为自然降温冷却。 将得 到的催化剂在惰性气体气氛下保存待用。
上述步骤 ii ) 是将钒源进一步负载于步骤 i ) 中制备的负载有铬的无机载 体 (例如上文所述的无机载体) 上的方法。 用于将钒源负载于无机载体上的方 法可以是己知的任何可以将钒负载于载体上的方法。 根据本发明的一个实施方 案, 将钒源负载于预先载有铬的无机载体上的方法包括用钒源溶液浸渍该预先 载有铬的多孔无机载体。 根据一个实施方案, 在浸渍过程中, 可以实施搅拌, 优选连续搅拌。 一般地, 该搅拌持续约 1~12小时, 优选约 4~8小时, 浸渍温 度为 10~80°C, 优选 20~70°C。 根据一个实施方案, 钒负载量为催化剂总重量 的 0.01~10wt%, 优选约 0.05~5wt%。然后将得到的浸渍有钒组分的载体进行干 燥。 该干燥通常在大约室温〜 20CTC的温度进行; 例如在大约 15~200°C进行, 优 选 20~200°C, 进一步优选约 100~200°C。 根据一个实施方案, 该干燥在约 120 °C进行。 该干燥亦可在真空条件下进行。 对该干燥进行的时间没有特别限定, 但是该干燥通常持续约 6~20小时, 优选约 7~18小时, 进一步优选约 8~15小 时。 在干燥完毕之后, 将浸渍有钒组分的样品进行焙烧。 对焙烧进行的方式没 有特别限定, 但是该焙烧优选在流化床内进行。 根据一个实施方案, 该焙烧通 常以两个阶段进行, 即低温阶段和高温阶段。 低温阶段通常在约 100~300°C进 行。 该高温阶段通常在约 300~900°C进行。 不受任何理论限制, 在所述低温阶 段将载体中吸附的物理水基本除去, 而在所述高温阶段将无机载体上的部分羟 基除去。 根据一个实施方案, 所述低温阶段持续 1~10小时, 优选 2~9个小时。 根据另一个实施方案, 所述高温阶段持续 1~10小时, 优选 2~9小时, 更优选 3~8小时。根据一个实施方案, 所述低温阶段在惰性气体或者空气气氛下进行, 优选在惰性气体气氛下进行, 所述惰性气体例如是以上所述的惰性气体。 根据 一个实施方案, 所述高温阶段焙烧在空气或者氧气条件下进行, 优选在干燥空 气条件下进行。 在所述焙烧结束后, 将得到的负载有无机氧化物形式钒和铬的 无机载体从高温阶段冷却。根据一个实施方案, 在冷却到 300~400°C的温度时, 可以变换气氛, 例如从空气变为惰性气体, 例如氮气、 氩气等。 根据一个实施 方案, 该冷却为自然降温冷却, 得到催化剂保存备用。
作为一个实例, 制备本发明催化剂的具体操作包括- 将多孔无定形硅胶浸渍在无机铬源的水溶液中, 铬负载量符合本文的要求 (例如为催化剂总重量的 0.1~2wt%, 以铬的重量计)连续搅拌一定时间(例如 3-8小时)后, 升温干燥;然后在流化床内进行高温焙烧,其中在低温阶段(例 如 100°C~300°C )在氮气气氛中焙烧脱除载体中吸附的物理水,在高温阶段(例 如 300°C~900°C ) 在干燥空气中焙烧脱除硅胶表面的部分羟基, 在此高温阶段 保持一定时间(例如 3~8个小时); 自然降温冷却, 在冷却到 300~400°C时切换 为氮气保护, 在氮气保护下转移, 保存待用, 然后将得到的催化剂母体浸渍在 一定浓度的偏钒酸铵溶液中, 钒负载量相对于催化剂总重量符合本文的要求 (例如 0.1~10wt%, 以钒的重量计);在连续搅拌一定时间(例如 4~8小时)后, 升温干燥; 将浸渍有偏钒酸铵的催化剂母体在流化床内进行高温焙烧, 其中在 低温阶段 (例如 100°C~300°C ) 在氮气气氛中焙烧脱除载体中吸附的物理水, 在高温阶段 (例如 300°C~900°C ) 干燥空气中焙烧脱除硅胶表面的部分羟基, 在此高温阶段保持一定时间 (例如 3~8 个小时); 自然降温冷却, 在冷却到 300~400°C时切换为氮气保护, 在氮气保护下转移, 得到催化剂保存待用。 本发明提供负载型金属氧化物双活性中心乙烯聚合催化剂的一种制备方 法包含如下步骤:
i ) 采用上述三种方法中任意一种方法制备出的铬钒双活性中心催化剂, 包括先载钒再载铬、 铬钒同时负载以及先载铬再载钒的三种负载型铬钒双中心 催化剂中的任意一种;
ϋ )在制备好的以上任意一种负载型铬钒双活性中心催化剂中加入有机金 属助催化剂进行预还原活化处理, 然后进行干燥保存备用。
根据一个优选的制备负载型铬钒双活性中心催化剂的方法, 包含如下步 骤:
i ) 采用上述三种方法中任一种制备出负载型铬钒双活性中心催化剂; ϋ )在惰性气氛下将得到的催化剂加入有机金属助催化剂, 对催化剂进行 预还原活化处理, 然后在 60-12CTC之间干燥 2-8小时, 干燥过程中也可以采用 真空, 然后在惰性气体下保存待用。
一般地, 上述方法是对得到的负载型铬钒双活性中心催化剂进行预还原活 化处理。 步骤 i ) 是用以上三种方法中的任一种方法制备出负载型铬钒双活性 中心催化剂, 步骤 ii ) 是在惰性气氛下加入有机金属助催化剂对该负载型铬钒 双活性中心催化剂进行预还原活化处理, 上述有机金属助催化剂包括有机铝化 合物、 有机锂化合物、 有机硼化合物等本领域技术人员公知的用于烯烃聚合反 应的任何一种助催化剂或者是它们的组合。 根据一个实施方案, 用作助催化剂 的有机铝化合物可以包括三垸基铝 Α1 、 二垸基垸氧基铝 AlR2OR、 二垸基卤 化铝 Α1 Χ、 铝氧垸、 乙基倍半铝氯化物等等, 其中 R是垸基, 例如具有 1一 12个碳原子的垸基, 例如是甲基、 乙基、 正丙基、 异丙基、 正丁基、 异丁基、 正戊基、 正己基、 正庚基、 正辛基、 正壬基、 正十二垸基等, X是卤素, 例如 氟、 氯、 溴和碘, 优选氯。 所述铝氧垸可以包括甲基铝氧垸 (MAO)等所有垸基 铝与水的反应物。 所述作为助催化剂的有机铝化合物可以单独使用或两种或两 种以上组合使用。 作为具体例子, 所述铝化合物可以提及三乙基铝、 三异丁基 铝、 二乙基乙氧基铝、 一氯二乙基铝和甲基铝氧垸等。 根据一个实施方案, 采 用有机铝助催化剂对铬钒双活性中心催化剂进行预还原活化处理时,铝 /铬摩尔 比在 0-1000之间, 优选 0-100, 更优选 0-50, 还原活化处理温度在室温 -10CTC 之间, 优选室温 -6CTC之间, 还原活化处理时间 0.5-20小时, 优选 0.5-10小时, 还原活化处理采用搅拌方式, 优选连续搅拌, 处理完毕后再在 60~120°C之间干 燥 2~8小时, 干燥在惰性气体气氛下进行, 例如在氮气、 氦气、 氩气等气氛下 进行, 优选在氮气气氛下进行, 该干燥过程也可在真空条件下进行。 得到的经 过预还原活化的负载型铬钒复合催化剂在惰性气体气氛下保存待用。
作为一个实例, 制备本发明催化剂的具体操作包括- 将多孔无定形硅胶浸渍在一定浓度的偏钒酸铵溶液中, 钒负载量相对于催 化剂总重量符合本文的要求(例如 0.1~10wt%, 以钒的重量计); 在连续搅拌一 定时间 (例如 4~8小时) 后, 升温干燥; 将负载有偏钒酸铵的硅胶载体在流化 床内进行高温焙烧, 其中在低温阶段 (例如 100°C~300°C ) 在氮气气氛中焙烧 脱除载体中吸附的物理水, 在高温阶段 (例如 300°C~900°C ) 在干燥空气中焙 烧脱除硅胶表面的部分羟基, 在此高温阶段保持一定时间 (例如 3~8个小时); 自然降温冷却, 在冷却到 300~400°C时切换为氮气保护, 制得载钒的催化剂母 体。 然后, 将无机铬源负载在由上述方法制得的催化剂母体上, 铬负载量符合 本文的要求(例如为催化剂总重量的 0.1~3wt%, 以铬的重量计)连续搅拌一定 时间 (例如 3~8小时) 后, 升温干燥; 然后在流化床内进行高温焙烧, 其中在 低温阶段 (例如 100°C~300°C ) 在氮气气氛中焙烧脱除载体中吸附的物理水, 在高温阶段(例如 300°C~900°C )在干燥空气中焙烧脱除硅胶表面的部分羟基, 在此高温阶段保持一定时间 (例如 3~8 个小时); 自然降温冷却, 在冷却到 300~400°C时切换为氮气保护, 在氮气保护下转移, 保存待用。 然后加入三乙 基铝对催化剂进行预还原活化处理, 铝 /铬摩尔比在 0-50, 处理温度在室温 -60 V , 连续搅拌 0.5-10小时, 然后再在 60~120°C之间干燥 2~8小时, 该干燥在惰 性气体气氛下进行, 例如在氮气、 氦气、 氩气等气氛下进行, 优选在氮气气氛 下进行, 该干燥过程也可在真空条件下进行。 得到的经过预还原活化的铬钒复 合催化剂在惰性气体气氛下保存待用。 根据本发明的一个方面, 可以先制备二氧化钛改性的无机载体, 然后再负 载铬和钒活性组分得到催化剂, 其中所述的二氧化钛改性的无机载体可用浸渍 法、 共沉淀法或溶胶-凝胶法制备, 其中一种制备方法如下- i )将钛化合物溶于溶剂中与无机载体搅拌混匀进行反应, 反应后将产物 进行干燥;
ϋ ) 将干燥后的产物在高温 300~900°C下焙烧, 得到所述二氧化钛改性的 无机载体。
根据一个优选的制备二氧化钛改性的无机载体的方法, 包含如下步骤- i ) 将钛化合物溶于溶剂, 然后浸渍在无机载体上, 浸渍时间为 l~12h, 优选 4~8h, 浸渍温度为 10~80°C, 优选 20~70°C, 然后在 50~200°C下干燥, 优 选 70~150°C, 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以采用真空干燥; ϋ )将上述样品在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧 温度在 300~900°C, 优选 400~800°C, 时间为 l~10h, 优选 4~6h, 然后进行冷 却, 其中在冷却到 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却。 将得到的二氧化钛改性的无机载体转移至广口瓶, 放在干燥器里保存备用。
上述步骤 i) 是将钛的化合物浸渍于无机载体(例如上文所述的无机载体) 上。 所述钛化合物同上述。 根据本发明的一个实施方案, 将钛化合物负载于无 机载体上的方法包括用钛化合物的溶液浸渍多孔无机载体。 根据一个实施方 案,在浸渍过程中,可以实施搅拌,优选连续搅拌。一般地,该搅拌持续约 l~12h, 优选约 4~8h, 浸渍温度为 10~80°C, 优选 20~70°C。 根据一个实施方案, 钛负 载量为催化剂总重量的 0.01~30wt%, 优选 0.05~20wt%。 然后将得到的浸渍有 钛化合物的载体进行干燥。 其中, 对干燥进行的时间没有特别限定, 但是该干 燥通常持续约 6~20h,优选约 7~18h,进一步优选约 8~15h。干燥温度在室温〜 250 V , 优选 50~200°C, 进一步优选 70~150°C, 干燥过程中也可以采用真空干燥。
上述步骤 ii ) 是将浸渍有钛化合物的无机载体进行焙烧。 对焙烧进行的方 式没有特别限定, 但是该焙烧优选在流化床内进行。 根据一个实施方案, 该焙 烧通常以两个阶段进行, 即低温阶段和高温阶段。 低温阶段通常在约 100~300 °C进行。 该高温阶段通常在约 300~900°C进行。 不受任何理论限制, 在所述低 温阶段载体中吸附的物理水基本被除去, 而在所述高温阶段无机载体上的部分 羟基被除去。 根据一个实施方案, 所述低温阶段持续 1~10小时, 优选 2~9小 时, 更优选 3~8小时。 根据另一个实施方案, 所述高温阶段持续 1~10小时, 优选 2~9小时, 更优选 3~8小时。 根据一个实施方案, 所述低温阶段在惰性气 体或者空气气氛下进行, 优选在惰性气体气氛下进行, 所述惰性气体例如是氮 气、 氦气、 氩气等气氛, 优选在氮气气氛下进行, 例如高纯氮气。 根据一个实 施方案, 所述高温阶段焙烧在空气或者氧气条件下进行, 优选在干燥空气条件 下进行。 在所述焙烧结束后, 将得到的负载有二氧化钛的无机载体从高温阶段 冷却。 根据一个实施方案, 在冷却到 300~400°C的温度时, 可以变换气氛, 例 如从空气变为惰性气体, 例如氮气、 氩气等。 根据一个实施方案, 该冷却为自 然降温冷却。 将得到的二氧化钛改性的无机载体转移至广口瓶, 放在干燥器里 保存备用。
作为一个实例, 采用上述方法制备本发明二氧化钛改性的无机载体的具体 操作包括:
将钛酸四正丁酯溶于正己垸中配成溶液, 其中钛负载量相对于催化剂总重 量符合本文的要求(例如 0.05~20wt%, 以 Ti的重量计), 在上述溶液中加入硅 胶浸渍, 在室温下连续搅拌一定时间后 (例如 4~8h), 然后在 70~150°C干燥 8~15h; 将干燥后的产物在流化床内进行高温焙烧, 其中在低温阶段 (例如 100~300°C ) 在氮气气氛中焙烧脱除载体中的物理水, 在高温阶段 (例如 300 °C~900°C )在干燥空气中焙烧脱除载体表面的部分羟基, 在此高温阶段保持一 定时间(例如 3~8个小时); 自然降温冷却, 在冷却到 300~400°C时切换为氮气 保护, 得到所述二氧化钛改性的硅胶, 转移至广口瓶, 放在干燥器里保存备用。
根据本发明的一个方面, 所述的二氧化钛改性的无机载体的一种制备方法 如下- i ) 将钛化合物和硅酸化合物混匀进行反应, 反应后将产物进行干燥; ϋ ) 将干燥后的产物在高温 300~900°C下焙烧, 得到所述二氧化钛改性的 无机载体。
根据一个优选的制备二氧化钛改性的无机载体的方法, 包含如下步骤- i ) 将钛化合物和硅酸化合物的溶液混匀进行共沉淀反应, 反应温度 10~100°C, 优选 20~60°C, 反应时间 2~10 h, 优选 3~8h。 然后在 50~200°C下 干燥, 优选 70~150°C, 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以采用 真空干燥;
ϋ )将上述样品在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧 温度在 300~900°C, 优选 400~800°C, 时间为 l~10h, 优选 4~6h, 然后进行冷 却, 其中在冷却到 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却。 将得到的二氧化钛改性的无机载体转移至广口瓶, 放在干燥器里保存备用。
上述步骤 i) 是将钛的化合物和硅酸化合物进行共沉淀。 所述钛化合物同 上述。 所述硅酸化合物选自硅酸铝、 硅酸钠、 正硅酸乙酯、 硅酸镁和硅酸钙、 其它合适的可溶性硅酸盐以及它们的组合。 所述钛化合物与硅酸化合物的用量 比根据所需钛含量计算得到, 根据一个实施方案, 钛负载量为催化剂总重量的 0.01~30wt% , 优选约 0.05~20wt°/。。 共沉淀反应温度为 10~100°C, 优选 20~60 V , 反应时间 2~10 h, 优选 3~8h。 然后将得到的样品进行干燥。 其中, 所述干 燥温度为 50~200°C, 优选 70~150°C, 干燥时间为 6~20小时, 优选 8~15小时, 也可以采用真空干燥。
上述步骤 ii ) 是将钛化合物和硅酸化合物的共沉淀物进行焙烧。 对焙烧进 行的方式没有特别限定,但是该焙烧优选在流化床内进行。根据一个实施方案, 该焙烧通常以两个阶段进行, 即低温阶段和高温阶段。 低温阶段通常在约 100~300°C进行。 该高温阶段通常在约 300~900°C进行。 不受任何理论限制, 在 所述低温阶段载体中吸附的物理水基本被除去, 而在所述高温阶段无机载体上 的部分羟基被除去。 根据一个实施方案, 所述低温阶段持续 1~10小时, 优选 2-9 小时, 更优选 3~8 小时。 根据另一个实施方案, 所述高温阶段持续 1~10 小时, 优选 2~9小时, 更优选 3~8小时。 根据一个实施方案, 所述低温阶段在 惰性气体或者空气气氛下进行, 优选在惰性气体气氛下进行, 所述惰性气体例 如是氮气、 氦气、 氩气等气氛, 优选在氮气气氛下进行, 例如高纯氮气。 根据 一个实施方案, 所述高温阶段焙烧在空气或者氧气条件下进行, 优选在干燥空 气条件下进行。 在所述焙烧结束后, 将得到的负载有二氧化钛的无机载体从高 温阶段冷却。 根据一个实施方案, 在冷却到 300~400°C的温度时, 可以变换气 氛, 例如从空气变为惰性气体, 例如氮气、 氩气等。 根据一个实施方案, 该冷 却为自然降温冷却。 将得到的二氧化钛改性的无机载体转移至广口瓶, 放在干 燥器里保存备用。 作为一个实例, 采用上述方法制备本发明二氧化钛改性的无机载体的具体 操作包括:
将钛酸四乙酯和硅酸钠混匀进行反应, 其中钛负载量相对于催化剂总重量 符合本文的要求(例如 0.05~20wt%,以 Ti的重量计),在 20~60°C下浸渍 3~8h, 然后在 70~150°C干燥 8~15h; 将干燥后的产物在流化床内进行高温焙烧, 其中 在低温阶段 (例如 100~300°C ) 在氮气气氛中焙烧脱除载体中的物理水, 在高 温阶段 (例如 300°C~900°C ) 在干燥空气中焙烧脱除载体表面的部分羟基, 在 此高温阶段保持一定时间(例如 3~8个小时);自然降温冷却,在冷却到 300~400 °C时切换为氮气保护, 得到所述二氧化钛改性的硅胶转移至广口瓶, 放在干燥 器里保存备用。
根据本发明的一个方面, 所述的二氧化钛改性的无机载体的一种制备方法 如下- i )将钛化合物与水和无水乙醇进行水解反应, 反应完毕后再加入无机酸 和无机载体进行反应, 反应后将产物进行干燥;
ϋ ) 将干燥后的产物在高温 300~900°C下焙烧, 得到所述二氧化钛改性的 无机载体。
根据一个优选的制备二氧化钛改性的无机载体的方法, 包含如下步骤- i )将钛化合物溶解于无水乙醇配成溶液 A, 滴入蒸馏水和无水乙醇的混 合溶液 B中(其中溶液 B中加入无机酸调节 pH值在 1~5, 优选 2~4之间), 钛 化合物水解即可得到 Ti02溶胶。 将无机载体加入上述 1102溶胶中, 充分搅拌, 搅拌温度 10~100°C,优选 20~60°C,搅拌时间 2~10 h,优选 3~8h。然后在 60~200 下干燥, 优选 70~150°C, 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以 采用真空干燥;
ϋ )将上述样品在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧 温度在 300~900°C, 优选 400~800°C, 时间为 l~10h, 优选 4~6h, 然后进行冷 却, 其中在冷却到 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却。 将得到的二氧化钛改性的无机载体转移至广口瓶, 放在干燥器里保存备用。
上述步骤 i) 是将钛化合物发生水解反应, 与无机载体混匀后得到无机载 体和 1102的凝胶。 所述钛化合物同上述。 上述无机酸选自硝酸、 盐酸和硫酸, 无机酸的浓度为 1.0 mol/L。 所述溶液入、 B是由两种溶液相互滴加混合而成; 所述溶液 A中,钛化合物与无水乙醇的体积比为(0.3~1.5 ): 2,优选(0.5~1.2): 2; 所述溶液 B中, 蒸馏水与无水乙醇的体积比为(50~150 ): 1, 优选 (70~130): 1 ; 所述溶液 B的 pH值为 1~5, 优选 2~4。 所述加入无机载体搅拌步骤中, 温 度为 20-100°C, 优选 20~40°C, 时间为 2-6小时, 优选 3-5小时。 根据一个实 施方案, 钛负载量为催化剂总重量的 0.01~30wt%, 优选约 0.05~20wt%。 然后 将得到的无机载体和 Ti02的凝胶进行干燥。 所述干燥步骤时间为 6-20小时, 优选 8-15小时,温度在室温〜 25CTC,优选在约 50~200°C,进一步优选约 70~150 °C。 干燥过程中也可以采用真空干燥。
上述步骤 ii ) 是将干燥后的无机载体 -1 02凝胶进行焙烧。 对焙烧进行的 方式没有特别限定, 但是该焙烧优选在流化床内进行。 根据一个实施方案, 该 焙烧通常以两个阶段进行,即低温阶段和高温阶段。低温阶段通常在约 100~300 °C进行。 该高温阶段通常在约 300~900°C进行。 不受任何理论限制, 在所述低 温阶段载体中吸附的物理水基本被除去, 而在所述高温阶段无机载体上的部分 羟基被除去。 根据一个实施方案, 所述低温阶段持续 1~10小时, 优选 2~9小 时, 更优选 3~8小时。 根据另一个实施方案, 所述高温阶段持续 1~10小时, 优选 2~9小时, 更优选 3~8小时。 根据一个实施方案, 所述低温阶段在惰性气 体或者空气气氛下进行, 优选在惰性气体气氛下进行, 所述惰性气体例如是氮 气、 氦气、 氩气等气氛, 优选在氮气气氛下进行, 例如高纯氮气。 根据一个实 施方案, 所述高温阶段焙烧在空气或者氧气条件下进行, 优选在干燥空气条件 下进行。 在所述焙烧结束后, 将得到的负载有二氧化钛的无机载体从高温阶段 冷却。 根据一个实施方案, 在冷却到 300~400°C的温度时, 可以变换气氛, 例 如从空气变为惰性气体, 例如氮气、 氩气等。 根据一个实施方案, 该冷却为自 然降温冷却。 将得到的二氧化钛改性的无机载体转移至广口瓶, 放在干燥器里 保存备用。
作为一个实例, 采用上述方法制备本发明二氧化钛改性的无机载体具体操 作包括- 将叔丁醇钛溶解于无水乙醇中, 按叔丁醇钛和无水乙醇体积比为 (0.5-1.2): 2配成 A液, 再将蒸馏水和无水乙醇按体积比 (70~130): 1配成 B 液, 加入浓硝酸调节 B液 pH范围在 2~4之间, 将 A液与 B液混合制得 Ti02 溶胶, 其中钛负载量相对于催化剂总重量符合本文的要求 (例如 0.05~20wt%, 以 Ti的重量计)。 之后将硅胶加入上述溶胶中, 搅拌温度 20~40°C, 搅拌时间 为 3~5小时。 然后在 70~150°C下干燥 8~15h; 将干燥后的产物在流化床内进行 高温焙烧, 其中在低温阶段 (例如 100~300°C ) 在氮气气氛中焙烧脱除载体中 的物理水, 在高温阶段 (例如 300°C~900°C ) 在干燥空气中焙烧脱除无机载体 表面的部分羟基, 在此高温阶段保持一定时间 (例如 3~8个小时); 自然降温 冷却, 在冷却到 300~400°C时切换为氮气保护,得到所述二氧化钛改性的硅胶, 转移至广口瓶, 放在干燥器里保存备用。
根据本发明的一个方面, 所述的二氧化钛改性无机载体的一种制备方法如 下:
i ) 将钛化合物与有机溶剂混匀后搅拌, 加入酸回流反应, 再加入无机载 体反应, 反应后将产物进行干燥;
ϋ ) 将得到的产物在高温 300~900°C下焙烧, 得到所述二氧化钛改性的无 机载体。
根据一个优选的制备二氧化钛改性的无机载体的方法, 包含如下步骤- i ) 将钛化合物溶于有机溶剂, 然后加入酸回流反应, 回流反应温度为 10-80°C , 优选 20-60°C, 时间为 3-7小时, 优选 4-6小时; 回流后的产物转移 至配置瓶, 加入无机载体搅拌, 搅拌温度 10~100°C, 优选 20~60°C, 反应时间 2-10 h,优选 3~8 h。然后在 60~200°C下干燥,优选 70~150°C,干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以采用真空干燥;
ϋ )将上述样品在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧 温度在 300~900°C, 优选 400~800°C, 时间为 l~10h, 优选 4~6h, 然后进行冷 却, 其中在冷却到 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却。 将得到的二氧化钛改性的无机载体转移至广口瓶, 放在干燥器里保存备用。
上述步骤 i) 是将钛化合物与无机载体反应。 所述钛化合物同上述。 所述 有机溶剂选自正庚垸、 正己垸、 环己垸等。 所述无机酸同上述。 调节 pH值为 1~5 , 优选 2~4。 所述回流反应, 温度为 10-80°C, 优选 20-60°C, 时间为 3-7 小时, 优选 4-6小时。 回流后的产物转移至配置瓶, 加入无机载体搅拌, 优选 连续搅拌, 搅拌温度 10~100°C, 优选 20~60°C, 反应时间 2~10 h, 优选 3~8 h。 根据一个实施方案, 钛负载量为催化剂总重量的 0.01~30wt%, 优选约 0.05~20wt%。 在所述反应完毕后还将产物进行干燥, 所述干燥步骤为先加热至 95 °C直至沉淀出现, 再于鼓风干燥箱中干燥; 所述鼓风干燥箱中干燥温度为 50-200 °C, 优选 70~150°C, 时间为 2~10小时, 优选 3-6小时。
上述步骤 ii ) 是将干燥后的二氧化钛改性的无机载体进行焙烧。 对焙烧进 行的方式没有特别限定,但是该焙烧优选在流化床内进行。根据一个实施方案, 该焙烧通常以两个阶段进行, 即低温阶段和高温阶段。 低温阶段通常在约 100~300°C进行。 该高温阶段通常在约 300~900°C进行。 不受任何理论限制, 在 所述低温阶段载体中吸附的物理水基本被除去, 而在所述高温阶段无机载体上 的部分羟基被除去。 根据一个实施方案, 所述低温阶段持续 1~10小时, 优选 2-9 小时, 更优选 3~8 小时。 根据另一个实施方案, 所述高温阶段持续 1~10 小时, 优选 2~9小时, 更优选 3~8小时。 根据一个实施方案, 所述低温阶段在 惰性气体或者空气气氛下进行, 优选在惰性气体气氛下进行, 所述惰性气体例 如是氮气、 氦气、 氩气等气氛, 优选在氮气气氛下进行, 例如高纯氮气。 根据 一个实施方案, 所述高温阶段焙烧在空气或者氧气条件下进行, 优选在干燥空 气条件下进行。 在所述焙烧结束后, 将得到的负载有二氧化钛的无机载体从高 温阶段冷却。 根据一个实施方案, 在冷却到 300~400°C的温度时, 可以变换气 氛, 例如从空气变为惰性气体, 例如氮气、 氩气等。 根据一个实施方案, 该冷 却为自然降温冷却。 将得到的二氧化钛改性的无机载体转移至广口瓶, 放在干 燥器里保存备用。
作为一个实例, 采用上述方法制备本发明二氧化钛改性的无机载体的具体 操作包括:
将钛酸异丙酯溶于正己垸溶剂, 其中钛负载量相对于催化剂总重量符合本 文的要求 (例如 0.05~20wt%, 以 Ti的重量计), 然后加入浓硝酸调节 pH值为 1~5 , 优选 2~4, 进行回流反应, 温度为 10-80°C, 优选 20-60°C, 时间为 3-7 小时, 优选 4-6小时。 回流后的产物转移至配置瓶, 加入硅胶搅拌, 搅拌温度 10~100°C, 优选 20~60°C, 反应时间 2~10 h, 优选 3~8 h。 然后加热至 95°C, 直至沉淀出现, 再将所得沉淀物放入 70~150°C鼓风干燥箱中干燥 3 小时;将 干燥后的产物在流化床内进行高温焙烧, 其中在低温阶段 (例如 100~300°C ) 在氮气气氛中焙烧脱除载体中的物理水, 在高温阶段 (例如 300°C~900°C ) 在 干燥空气中焙烧脱除无机载体表面的部分羟基, 在此高温阶段保持一定时间 (例如 3~8个小时); 自然降温冷却, 在冷却到 300~400°C时切换为氮气保护, 得到所述二氧化钛改性的硅胶, 转移至广口瓶, 放在干燥器里保存备用。 根据本发明的一个方面, 本发明提供以下制备二氧化钛改性的负载型铬钒 双活性中心催化剂的方法, 其中一种方法包含如下步骤- i )按照上述制备二氧化钛改性的无机载体方法中的任一种方法制备出二 氧化钛改性的无机载体;
ϋ ) 将步骤 i ) 得到的二氧化钛改性的无机载体浸渍含有钒的溶液, 然后 干燥, 接着在高温 300~900°C下焙烧活化;
iii ) 将步骤 ii ) 所得的产物浸渍含有铬的溶液, 然后干燥, 接着在高温 300~900°C下焙烧活化, 得到所述催化剂保存备用。
根据一个优选的制备二氧化钛负载型铬钒双活性中心催化剂的方法, 包含 如下步骤:
i )按照上述制备二氧化钛改性的无机载体方法中的任一种方法制备出二 氧化钛改性的无机载体;
ii )将钒的盐溶液浸渍在二氧化钛改性的无机载体上,浸渍时间为 l~12h, 优选 4~8h, 浸渍温度为 10~80°C, 优选 20~70°C, 然后在 90~250°C下干燥, 优 选 100~200°C,干燥时间 6~20h,优选 8~15h,干燥过程中也可以采用真空干燥; 将上述样品在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧温度在 300-900 °C , 优选 400~800°C, 时间为 l~10h, 优选 4~6h, 然后进行冷却, 其中 在冷却到 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却;
iii ) 将铬的盐溶液浸渍在上述负载有钒的催化剂母体上, 浸渍时间为 l~12h, 优选 4~8h, 浸渍温度为 10~80°C, 优选 15~60°C, 然后在 90~250°C之 间干燥, 优选 100~150°C, 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以采 用真空; 将上述样品在惰性气体或者氧气或者空气中进行焙烧活化, 焙烧温度 在 300~900°C, 优选 400~800°C, 时间为 l~10h, 优选 3~8h, 然后进行冷却, 在冷却至 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却, 得到所述 催化剂保存备用。
上述步骤 i )是按照上述制备二氧化钛改性的无机载体方法中的任一种方 法制备出二氧化钛改性的无机载体。 步骤 ii ) 是将钒源负载于二氧化钛改性的 无机载体 (例如上文所述的二氧化钛改性的无机载体) 上。 用于将钒源负载于 二氧化钛改性的无机载体上的方法可以是己知的任何可以将钒负载于载体上 的方法。 根据本发明的一个实施方案, 将钒源负载于二氧化钛改性的无机载体 上的方法包括用钒源溶液浸渍该二氧化钛改性的无机载体。 根据一个实施方 案,在浸渍过程中,可以实施搅拌,优选连续搅拌。一般地,该搅拌持续约 l~12h, 优选约 4~8h, 浸渍温度为 10~80°C, 优选 20~70°C。 根据一个实施方案, 钒负 载量为催化剂总重量的 0.01~10wt%, 优选约 0.05~5wt%。然后将得到的浸渍有 钒组分的二氧化钛改性的载体进行干燥。 该干燥通常在室温〜 25CTC进行, 优选 在约 90~250°C,进一步优选约 100~200°C。根据一个实施方案,该干燥在约 120 °C进行。 该干燥亦可在真空条件下进行。 对该干燥进行的时间没有特别限定, 但是该干燥通常持续约 6~20h, 优选约 7~18h, 进一步优选约 8~15h。在干燥完 毕之后, 将含有钒组分的二氧化钛改性的无机载体进行焙烧。 对焙烧进行的方 式没有特别限定, 但是该焙烧优选在流化床内进行。 根据一个实施方案, 该焙 烧通常以两个阶段进行, 即低温阶段和高温阶段。 低温阶段通常在约 100~300 °C进行。 该高温阶段通常在约 300~900°C进行。 不受任何理论限制, 在所述低 温阶段载体中吸附的物理水基本被除去, 而在所述高温阶段无机载体上的部分 羟基被除去。 根据一个实施方案, 所述低温阶段持续 1~10小时, 优选 2~9小 时, 更优选 3~8小时。 根据另一个实施方案, 所述高温阶段持续 1~10小时, 优选 2~9小时, 更优选 3~8小时。 根据一个实施方案, 所述低温阶段在惰性气 体或者空气气氛下进行, 优选在惰性气体气氛下进行, 所述惰性气体例如是氮 气、 氦气、 氩气等气氛, 优选在氮气气氛下进行, 例如高纯氮气。 根据一个实 施方案, 所述高温阶段焙烧在空气或者氧气条件下进行, 优选在干燥空气条件 下进行。在所述焙烧结束后,将得到的负载有钒的催化剂母体从高温阶段冷却。 根据一个实施方案, 在冷却到 300~400°C的温度时, 可以变换气氛, 例如从空 气变为惰性气体, 例如氮气、 氩气等。 根据一个实施方案, 该冷却为自然降温 冷却。
上述步骤 iii ) 是将无机铬源负载于步骤 ii ) 中制备的负载有钒的催化剂母 体上。 用于将无机铬源负载于催化剂母体上的方法可以是本领域技术人员己知 的任何可以将铬负载于载体上的方法, 例如可以提及常规己知的制备 Phillips 催化剂的方法。 所述铬源可以是上文所述的无机铬源。 根据一个实施方案, 在 浸渍过程中, 可以实施搅拌, 优选连续搅拌。 一般地, 该搅拌持续约 1~12小 时, 优选约 4~8 小时。 根据一个实施方案, 铬的负载量为催化剂总重量的约 0.01~10wt% , 优选约 0.05~5wt%, 进一步优选约 0.1~3wt%。 然后将得到的样 品进行干燥。该干燥通常在大约室温到 200°C的温度进行; 例如在大约 15°C到 25CTC进行, 优选在约 9CTC到 250°C, 进一步优选约 10CTC到 20CTC。 根据一个 实施方案, 该干燥在约 12CTC进行。 对该干燥进行的时间没有特别限定, 但是 该干燥通常持续约 6~20小时, 优选约 7~18小时, 进一步优选约 8~15小时。 在干燥完毕之后, 将所得样品进行焙烧。 对焙烧进行的方式没有特别限定, 但 是该焙烧优选在流化床内进行。 根据一个实施方案, 该焙烧通常以两个阶段进 行, 即低温阶段和高温阶段。 该低温阶段通常在约 100~300°C进行。 该高温阶 段通常在约 300~900°C进行。 不受任何理论限制, 在所述低温阶段载体中吸附 的物理水被除去, 而在所述高温阶段无机载体上的部分羟基被除去。 根据一个 实施方案, 所述低温阶段持续 1~10小时, 优选 2~8小时。 根据一个实施方案, 所述高温阶段持续 1~10小时, 优选 2~9小时, 更优选 3~8个小时。 根据一个 实施方案, 所述低温阶段在惰性气体或者空气气氛下进行, 优选在惰性气体下 进行, 所述惰性气体例如氮气、 氦气、 氩气等气氛, 优选在氮气气氛下进行, 例如高纯氮气。 根据一个实施方案, 所述高温阶段焙烧在空气或者氧气条件下 进行, 优选在干燥空气条件下进行。 在所述焙烧结束后, 将得到的负载上金属 氧化物的二氧化钛改性的无机载体从高温阶段冷却。 根据一个实施方案, 在高 温焙烧之后冷却到 300~400°C的温度时, 可以变换气氛, 例如从空气变为惰性 气体, 例如氮气等。 根据一个实施方案, 该冷却为自然降温冷却。 将得到的催 化剂在惰性气体气氛下保存备用。
作为一个实例, 制备本发明催化剂的具体操作包括- 按照上述制备二氧化钛改性的无机载体方法中的任一种方法制备出二氧 化钛改性的无机载体如二氧化钛改性的硅胶, 其中钛负载量相对于催化剂总重 量符合本文的要求(例如 0.05~20wt%, 以 Ti的重量计); 将所得的二氧化钛改 性的硅胶浸渍在一定浓度的偏钒酸铵溶液中, 钒负载量相对于催化剂总重量符 合本文的要求(例如 0.1~10wt%, 以钒的重量计); 在连续搅拌一定时间 (例如 4~8小时)后, 升温干燥; 将浸渍有偏钒酸铵的载体在流化床内进行高温焙烧, 其中在低温阶段(例如 100°C~300°C )在氮气气氛中焙烧脱除载体中的物理水, 在高温阶段(例如 300°C~900°C )在干燥空气中焙烧脱除载体表面的部分羟基, 在此高温阶段保持一定时间 (例如 3~8 个小时); 自然降温冷却, 在冷却到 300~400°C时切换为氮气保护, 制得负载有钒的催化剂母体。 然后, 将无机铬 源负载在由上述方法制得的催化剂母体上, 铬负载量符合本文的要求 (例如为 催化剂总重量的 0.1~5wt%,以铬的重量计)连续搅拌一定时间(例如 4~8小时) 后, 升温干燥; 然后在流化床内进行高温焙烧, 其中在低温阶段 (例如 10CTC -300 °C ) 在氮气气氛中焙烧脱除载体中吸附的物理水, 在高温阶段 (例如 300 °C~900°C )在干燥空气中焙烧脱除无机载体表面的部分羟基, 在此高温阶段保 持一定时间(例如 3~8个小时); 自然降温冷却, 在冷却到 300~400°C时切换为 氮气保护, 在氮气保护下转移, 得到催化剂保存备用。 本发明提供二氧化钛改性的负载型铬钒金属氧化物双活性中心催化剂的 一种制备方法包含如下步骤- i )按照上述制备二氧化钛改性的无机载体方法中的任一种方法制备出二 氧化钛改性的无机载体;
ϋ ) 将步骤 i ) 得到的二氧化钛改性的无机载体浸渍含有钒和铬的溶液, 然后干燥;
iii) 将步骤 ii ) 所得的产物所得的产物在高温 300°C~900°C下焙烧活化, 得到所述催化剂保存备用。
根据一个优选的制备二氧化钛改性的负载型铬钒双活性中心催化剂的方 法包含如下步骤:
i )按照上述制备二氧化钛改性的无机载体方法中的任一种方法制备出二 氧化钛改性的无机载体;
ϋ )将含有铬和钒的混合盐溶液共同浸渍在步骤 i ) 中得到的二氧化钛改 性的无机载体上, 浸渍时间为 l~12h, 优选 4~8h, 浸渍温度为 10~80°C, 优选 20-70 °C , 然后在 90~250°C之间干燥, 优选 100~200°C, 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以采用真空;
iii)将上述样品在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧 温度在 300~900°C, 优选 400~800°C, 时间为 l~10h, 优选 3~8h, 然后进行冷 却, 在冷却至 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却, 得到 所述催化剂保存备用。 上述步骤 i )是按照上述制备二氧化钛改性的无机载体方法中的任一种方 法制备出二氧化钛改性的无机载体。 上述步骤 ii ) 是将铬源和钒源同时浸渍于 二氧化钛改性的无机载体 (上文所述的二氧化钛改性的无机载体) 上的方法。 所述铬源可以是上文所述的任何铬源, 钒源可以是上文所述的任何钒源。 根据 一个实施方案, 在浸渍过程中, 可以实施加热搅拌, 优选连续加热搅拌。 一般 地, 该搅拌持续约 1~12小时, 优选约 4~8小时, 浸渍温度为 10~80°C, 优选 20~70°C。 根据一个实施方案, 铬的负载量为催化剂总重量的 0.01~10wt%, 优 选 0.05~5wt% ; 钒负载量为催化剂总重量的 0.01~10wt%, 优选约 0.05~5wt%。 然后将得到的样品进行干燥。 该干燥通常在大约室温〜 25CTC的温度进行, 优选 90°C~250°C , 进一步优选 100°C~200°C。 对该干燥进行的时间没有特别限定, 但是该干燥通常持续约 6~20小时, 优选约 7~18小时, 进一步优选约 8~15小 时, 干燥过程中也可以采用真空。
上述步骤 iii ) 是在干燥完毕之后, 将浸渍有铬和钒化合物的二氧化钛改性 的载体进行焙烧, 并最终将铬钒氧化物负载于载体表面。 对焙烧进行的方式没 有特别限定, 但是该焙烧优选在流化床内进行。 根据一个实施方案, 该焙烧通 常以两个阶段进行, 即低温阶段和高温阶段。 该低温阶段通常在约 100~300°C 进行。 该高温阶段通常在约 300~900°C进行。 不受任何理论限制, 在所述低温 阶段载体中吸附的物理水被除去, 而在所述高温阶段的载体上的部分羟基被除 去。 根据一个实施方案, 所述低温阶段持续 1~10小时, 优选 2~9个小时。 根 据另一个实施方案, 所述高温阶段持续 1~10个小时, 优选 2~9个小时, 更优 选 3~8个小时。 根据一个实施方案, 所述低温阶段在惰性气体或者空气气氛下 进行, 优选在惰性气体下进行, 所述惰性气体例如氮气、 氦气、 氩气等气氛, 优选在氮气气氛下进行, 例如高纯氮气。 根据一个实施方案, 所述高温阶段焙 烧在空气或者氧气条件下进行, 优选在干燥空气条件下进行。 在所述焙烧结束 后, 将得到的负载上金属氧化物的二氧化钛改性的无机载体从高温阶段冷却。 根据一个实施方案, 在高温焙烧之后冷却到 300~400°C的温度时, 可以变换气 氛, 例如从空气变为惰性气体, 例如氮气。 根据一个实施方案, 该冷却为自然 降温冷却。 将得到的催化剂在惰性气体气氛下保存备用。
作为一个实例, 制备本发明催化剂的具体操作包括- 按照上述制备二氧化钛改性的无机载体方法中的任一种方法制备出二氧 化钛改性的无机载体如二氧化钛改性的硅胶, 其中钛负载量相对于催化剂总重 量符合本文的要求(例如 0.05~20wt%, 以 Ti的重量计); 将所得二氧化钛改性 的硅胶浸渍在一定浓度的偏钒酸铵和碱式醋酸铬的水溶液中, 钒和铬的负载量 相对于催化剂总重量符合本文的要求(例如钒 0.1~10wt%, 铬 0.1~3wt%, 分别 以钒和铬的重量计); 在连续搅拌一定时间 (例如 4~8小时) 后, 升温干燥; 然后在流化床内进行高温焙烧, 其中在低温阶段 (例如 100°C~300°C ) 在氮气 气氛中焙烧脱除载体中吸附的物理水, 在高温阶段 (例如 300°C~900°C ) 在干 燥空气中焙烧脱除无机载体表面的部分羟基, 在此高温阶段保持一定时间 (例 如 3~8个小时); 自然降温冷却, 在冷却到 300~400°C时切换为氮气保护, 在氮 气保护下转移, 催化剂保存备用。 本发明提供二氧化钛改性的负载型铬钒双活性中心催化剂的一种制备方 法包含如下步骤:
i )按照上述制备二氧化钛改性的无机载体方法中的任一种方法制备出二 氧化钛改性的无机载体;
ϋ ) 将步骤 i ) 所得的二氧化钛改性的无机载体浸渍含有铬的溶液, 然后 干燥, 接着在高温 300°C~900°C下焙烧活化;
iii )将步骤 ii )所得的产物浸渍含有钒的溶液,然后干燥,接着在高温 300 °C~900°C下焙烧活化, 得到催化剂保存备用。
根据一个优选的制备二氧化钛改性的负载型铬钒双活性中心催化剂的方 法包含如下步骤:
i )按照上述制备二氧化钛改性的无机载体方法中的任一种方法制备出二 氧化钛改性的无机载体;
ϋ ) 将铬的盐溶液浸渍在步骤 i ) 所得的二氧化钛改性的无机载体上, 浸 渍时间为 l~12h,优选 4-8h,浸渍温度为 10~80°C,优选 20-70 °C,然后在 90~250 °C之间干燥, 优选 100~150°C, 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可 以采用真空; 将上述样品在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧温度在 300~900°C, 优选 400~800°C, 时间为 l~10h, 优选 3~8h, 然后进 行冷却, 在冷却至 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却, 得到负载有铬的催化剂母体; iii ) 将钒的盐溶液浸渍到上述负载有铬的催化剂母体上, 浸渍时间为 l~12h, 优选 3-8h, 浸渍温度为 10~80°C, 优选 20~70°C, 然后在 90~250°C之 间干燥, 优选 100~150°C, 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以采 用真空; 将上述样品在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧 温度在 300~900°C, 优选 400~800°C, 时间为 l~10h, 优选 3~8h, 然后进行冷 却, 在冷却至 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却, 得到 所述催化剂保存备用。
上述步骤 i )是按照上述制备二氧化钛改性的无机载体方法中的任一种方 法制备出二氧化钛改性的无机载体; 上述步骤 ii ) 是将铬源负载于二氧化钛改 性的无机载体 (例如上文所述的二氧化钛改性的无机载体) 上的方法。 用于将 铬源负载于二氧化钛改性的无机载体上的方法可以是本领域技术人员己知的 任何可以将铬负载于载体上的方法, 例如可以提及常规己知的制备 Phillips催 化剂的方法。 所述铬源可以是上文所述的任何铬源。 根据一个实施方案, 在浸 渍过程中, 可以实施搅拌, 优选连续搅拌。 一般地, 该搅拌持续约 1~12小时, 优选约 4~8 小时。 根据一个实施方案, 铬的负载量为催化剂总重量的约 0.01~10wt% , 优选约 0.05~5wt%, 进一步优选约 0.1~2wt%。 然后将得到的样 品进行干燥。 该干燥通常在大约室温到 20CTC的温度进行; 例如在 15°C到 200 °C进行, 优选 2CTC到 200°C, 进一步优选 100°C到 200°C。 根据一个实施方案, 该干燥在约 12CTC进行。 对该干燥进行的时间没有特别限定, 但是该干燥通常 持续约 6~20小时, 优选约 7~18小时, 进一步优选约 8~15小时。 在干燥完毕 之后, 将含有铬的二氧化钛改性的无机载体进行焙烧。 对焙烧进行的方式没有 特别限定, 但是该焙烧优选在流化床内进行。 根据一个实施方案, 该焙烧通常 以两个阶段进行, 即低温阶段和高温阶段。 该低温阶段通常在约 100~300°C进 行。 该高温阶段通常在约 300°C~900°C进行。 不受任何理论限制, 在所述低温 阶段载体中吸附的物理水被除去, 而在所述高温阶段无机载体上的部分羟基被 除去。 根据一个实施方案, 所述低温阶段持续 1~10小时, 优选 2~9小时。 根 据另一个实施方案, 所述高温阶段持续 1~10小时, 优选 2~9小时, 更优选 3~8 小时。 根据一个实施方案, 所述低温阶段在惰性气体或者空气气氛下进行, 优 选惰性气体气体, 更优选在氮气气氛下进行, 例如高纯氮气。 根据一个实施方 案, 所述高温焙烧阶段在在惰性气体或者空气中进行, 优选干燥空气。 在所述 焙烧结束后, 将得到的负载有铬的催化剂母体从高温阶段冷却。 根据一个实施 方案, 在高温焙烧之后冷却到 300~400°C的温度时, 可以切换气氛, 例如从空 气变为惰性气体, 例如氮气。 根据一个实施方案, 该冷却为自然降温冷却。 将 得到的催化剂母体在惰性气体气氛下保存待用。
上述步骤 iii ) 是将钒源进一步负载于步骤 ii ) 中制备的负载有铬的催化剂 母体上。 用于将钒源负载于催化剂母体上的方法可以是己知的任何可以将钒负 载于载体上的方法。 根据本发明的一个实施方案, 将钒源负载于催化剂母体上 的方法包括用钒源溶液浸渍该催化剂母体。 所述钒源可以是上文所述的任何钒 源。 根据一个实施方案, 在浸渍过程中, 可以实施搅拌, 优选连续搅拌。 一般 地, 该搅拌持续约 1~12小时, 优选约 4~8小时, 浸渍温度为 10~80°C, 优选 20~70°C。 根据一个实施方案, 钒负载量为催化剂总重量的 0.01~10wt%, 优选 约 0.05~5wt%。 然后将得到的样品进行干燥。 该干燥通常在大约室温〜 20CTC的 温度进行; 例如在大约 15~200°C进行, 优选 20~200°C, 进一步优选约 100~200 °C。 根据一个实施方案, 该干燥在约 12CTC进行。 该干燥亦可在真空条件下进 行。 对该干燥进行的时间没有特别限定, 但是该干燥通常持续约 6~20小时, 优选约 7~18小时, 进一步优选约 8~15小时。 在干燥完毕之后, 将浸渍有钒组 分的样品进行焙烧。 对焙烧进行的方式没有特别限定, 但是该焙烧优选在流化 床内进行。 根据一个实施方案, 该焙烧通常以两个阶段进行, 即低温阶段和高 温阶段。 低温阶段通常在约 100~300°C进行。 该高温阶段通常在约 300~900°C 进行。 不受任何理论限制, 在所述低温阶段将载体中吸附的物理水基本除去, 而在所述高温阶段将无机载体上的部分羟基除去。 根据一个实施方案, 所述低 温阶段持续 1~10小时, 优选 2~9个小时。 根据另一个实施方案, 所述高温阶 段持续 1~10小时, 优选 2~9小时, 更优选 3~8小时。 根据一个实施方案, 所 述低温阶段在惰性气体或者空气气氛下进行, 优选在惰性气体气氛下进行, 所 述惰性气体例如是以上所述的惰性气体。 根据一个实施方案, 所述高温阶段焙 烧在空气或者氧气条件下进行, 优选在干燥空气条件下进行。 在所述焙烧结束 后, 将得到的得到的负载上金属氧化物的载体从高温阶段冷却。 根据一个实施 方案, 在冷却到 300~400°C的温度时, 可以变换气氛, 例如从空气变为惰性气 体, 例如氮气、 氩气等。 根据一个实施方案, 该冷却为自然降温冷却, 得到催 化剂保存备用。 作为一个实例, 制备本发明催化剂的具体操作包括- 按照上述制备二氧化钛改性的无机载体方法中的任一种方法制备出二氧 化钛改性的无机载体如二氧化钛改性的硅胶, 其中钛负载量相对于催化剂总重 量符合本文的要求(例如 0.05~20wt%, 以 Ti的重量计)。 将制备好的二氧化钛 改性的硅胶浸渍在无机铬源的水溶液中, 铬负载量符合本文的要求 (例如为催 化剂总重量的 0.1~2wt%, 以铬的重量计) 连续搅拌一定时间 (例如 3~8小时) 后, 升温干燥; 然后在流化床内进行高温焙烧, 其中在低温阶段 (例如 10CTC -300 °C ) 在氮气气氛中焙烧脱除载体中吸附的物理水, 在高温阶段 (例如 300 °C~900°C )在干燥空气中焙烧脱除无机载体表面的部分羟基, 在此高温阶段保 持一定时间(例如 3~8个小时); 自然降温冷却, 在冷却到 300~400°C时切换为 氮气保护, 在氮气保护下转移, 保存待用, 然后将得到的负载有铬的催化剂母 体浸渍在一定浓度的偏钒酸铵溶液中, 钒负载量相对于催化剂总重量符合本文 的要求 (例如 0.1~10wt%, 以钒的重量计); 在连续搅拌一定时间 (例如 4~8 小时)后,升温干燥;将所得样品在流化床内进行高温焙烧,其中低温阶段(例 如 100°C~300°C ) 在氮气气氛中焙烧脱除载体中吸附的物理水, 高温阶段 (例 如 300°C~900°C ) 在干燥空气中焙烧脱除硅胶表面的部分羟基, 在此高温阶段 保持一定时间(例如 3~8个小时); 自然降温冷却, 在冷却到 300~400°C时切换 为氮气保护, 在氮气保护下转移, 得到催化剂保存待用。 本发明提供二氧化钛改性的负载型铬钒双活性中心催化剂的一种制备方 法包含如下步骤:
i ) 将无机载体浸渍含有钛和钒的溶液, 然后干燥, 接着在高温 300~900 °C下焙烧活化;
ϋ ) 将步骤 i ) 所得的产物浸渍含有铬的溶液, 然后干燥, 接着在高温 300~900°C下焙烧活化, 得到所述催化剂保存备用。
根据一个优选的制备二氧化钛改性的负载型铬钒双活性中心催化剂的方 法包含如下步骤:
i ) 将含有钛和钒的盐溶液浸渍在无机载体上, 浸渍时间为 l~12h, 优选 4-8h, 浸渍温度为 10~80°C, 优选 20~70°C, 然后在 90~250°C之间干燥, 优选 100~150°C, 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以采用真空; 将上 述样品在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧温度在
300-900 °C , 优选 400~800°C, 时间为 l~10h, 优选 3~8h, 然后进行冷却, 在冷 却至 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却, 得到负载有钛 和钒的催化剂母体;
ϋ )将铬的盐溶液浸渍到上述负载有钛和钒的催化剂母体上, 浸渍时间为 l~12h, 优选 3-8h, 浸渍温度为 10~80°C, 优选 20~70°C, 然后在 90~250°C之 间干燥, 优选 100~150°C, 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以采 用真空; 将上述样品在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧 温度在 300~900°C, 优选 400~800°C, 时间为 l~10h, 优选 3~8h, 然后进行冷 却, 在冷却至 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却, 得到 所述催化剂保存备用。
上述步骤 i ) 是将钛和钒负载于无机载体 (例如上文所述的无机载体) 上 的方法。 所述钛源可以是上文所述的任何钛源, 所述钒源可以是上文所述的任 何钒源。 根据一个实施方案, 在浸渍过程中, 可以实施搅拌, 优选连续搅拌。 一般地, 该搅拌持续约 1~12小时, 优选约 4~8小时。 根据一个实施方案, 钛 负载量为催化剂总重量的 0.01~30wt%, 优选约 0.05~20wt%; 钒负载量为催化 剂总重量的 0.01~10wt%, 优选约 0.05~5wt%。 然后将得到的样品进行干燥。 该 干燥通常在大约室温到 20CTC的温度进行; 例如在 15°C到 20CTC进行, 优选 20 °( 到200°( , 进一步优选 100°C到 200°C。 根据一个实施方案, 该干燥在约 120 °C进行。 对该干燥进行的时间没有特别限定, 但是该干燥通常持续约 6~20小 时, 优选约 7~18小时, 进一步优选约 8~15小时。 在干燥完毕之后, 将含有钛 和钒的载体进行焙烧。 对焙烧进行的方式没有特别限定, 但是该焙烧优选在流 化床内进行。 根据一个实施方案, 该焙烧通常以两个阶段进行, 即低温阶段和 高温阶段。 该低温阶段通常在约 100~300°C进行。 该高温阶段通常在约 30CTC ~900°C进行。不受任何理论限制,在所述低温阶段载体中吸附的物理水被除去, 而在所述高温阶段无机载体上的部分羟基被除去。 根据一个实施方案, 所述低 温阶段持续 1~10小时, 优选 2~9小时。 根据另一个实施方案, 所述高温阶段 持续 1~10小时, 优选 2~9小时, 更优选 3~8小时。 根据一个实施方案, 所述 低温阶段在惰性气体或者空气气氛下进行, 优选惰性气体气体, 更优选在氮气 气氛下进行, 例如高纯氮气。 根据一个实施方案, 所述高温焙烧阶段在在惰性 气体或者空气中进行, 优选干燥空气。 在所述焙烧结束后, 将得到的负载有钛 和钒的催化剂母体从高温阶段冷却。 根据一个实施方案, 在高温焙烧之后冷却 到 300~400°C的温度时, 可以切换气氛, 例如从空气变为惰性气体, 例如氮气。 根据一个实施方案, 该冷却为自然降温冷却。 将得到的催化剂母体在惰性气体 气氛下保存待用。
上述步骤 ii ) 是将铬源进一步负载于步骤 i ) 中制备的负载有钛和钒的催 化剂母体上。 用于将铬源负载于催化剂母体上的方法可以是己知的任何可以将 铬负载于载体上的方法, 例如可以提及常规己知的制备 Phillips催化剂的方法。 根据本发明的一个实施方案, 将铬源负载于预先负载有钛和钒的催化剂母体上 的方法包括用铬源溶液浸渍该催化剂母体。 根据一个实施方案, 铬的负载量为 催化剂总重量的约 0.01~10wt%, 优选约 0.05~5wt%, 进一步优选约 0.1~2wt %。 根据一个实施方案, 在浸渍过程中, 可以实施搅拌, 优选连续搅拌。 一般 地, 该搅拌持续约 1~12小时, 优选约 4~8小时, 浸渍温度为 10~80°C, 优选 20~70°C。 然后将得到的浸渍有铬组分的载体进行干燥。 该干燥通常在大约室 温〜 20CTC的温度进行; 例如在大约 15~200°C进行, 优选 20~200°C, 进一步优 选约 100~200°C。 根据一个实施方案, 该干燥在约 12CTC进行。 该干燥亦可在 真空条件下进行。 对该干燥进行的时间没有特别限定, 但是该干燥通常持续约 6~20小时, 优选约 7~18小时, 进一步优选约 8~15小时。 在干燥完毕之后, 将 浸渍有铬组分的样品进行焙烧。 对焙烧进行的方式没有特别限定, 但是该焙烧 优选在流化床内进行。 根据一个实施方案, 该焙烧通常以两个阶段进行, 即低 温阶段和高温阶段。 低温阶段通常在约 100~300°C进行。 该高温阶段通常在约 300~900°C进行。 不受任何理论限制, 在所述低温阶段将载体中吸附的物理水 基本除去, 而在所述高温阶段将无机载体上的部分羟基除去。 根据一个实施方 案, 所述低温阶段持续 1~10小时, 优选 2~9个小时。 根据另一个实施方案, 所述高温阶段持续 1~10小时, 优选 2~9小时, 更优选 3~8小时。 根据一个实 施方案, 所述低温阶段在惰性气体或者空气气氛下进行, 优选在惰性气体气氛 下进行, 所述惰性气体例如是以上所述的惰性气体。 根据一个实施方案, 所述 高温阶段焙烧在空气或者氧气条件下进行, 优选在干燥空气条件下进行。 在所 述焙烧结束后, 将得到的负载上金属氧化物的载体从高温阶段冷却。 根据一个 实施方案, 在冷却到 300~400°C的温度时, 可以变换气氛, 例如从空气变为惰 性气体, 例如氮气、 氩气等。 根据一个实施方案, 该冷却为自然降温冷却, 得 到催化剂在惰性气体下保存备用。
作为一个实例, 制备本发明催化剂的具体操作包括- 将硅胶浸渍在含有硫酸钛和草酸氧钒的水溶液中, 钛负载量相对于催化剂 总重量符合本文的要求 (例如 0.05~20wt%, 以钛的重量计), 钒负载量相对于 催化剂总重量符合本文的要求(例如 0.1~10wt%, 以钒的重量计), 连续搅拌一 定时间 (例如 3~8小时) 后, 升温干燥; 然后在流化床内进行高温焙烧, 其中 在低温阶段(例如 100°C~300°C )在氮气气氛中焙烧脱除载体中吸附的物理水, 在高温阶段(例如 300°C~900°C )在干燥空气中焙烧脱除载体表面的部分羟基, 在此高温阶段保持一定时间 (例如 3~8 个小时); 自然降温冷却, 在冷却到 300~400°C时切换为氮气保护, 在氮气保护下转移, 保存待用, 然后将得到的 催化剂母体浸渍在一定浓度的碱式醋酸铬的水溶液中, 铬负载量符合本文的要 求 (例如为催化剂总重量的 0.1~2wt%, 以铬的重量计); 在连续搅拌一定时间 (例如 4~8小时) 后, 升温干燥; 将所得产物在流化床内进行高温焙烧, 其中 低温阶段 (例如 100°C~300°C ) 在氮气气氛中焙烧脱除载体中吸附的物理水, 高温阶段 (例如 300°C~900°C ) 在干燥空气中焙烧脱除载体表面的部分羟基, 在此高温阶段保持一定时间 (例如 3~8 个小时); 自然降温冷却, 在冷却到 300~400°C时切换为氮气保护, 在氮气保护下转移, 得到催化剂保存待用。 本发明提供二氧化钛改性的负载型铬钒双活性中心催化剂的一种制备方 法包含如下步骤:
i ) 将无机载体浸渍含有钛和铬的溶液, 然后干燥, 接着在高温 300~900 °C下焙烧活化;
ϋ ) 将步骤 i ) 所得的产物浸渍含有钒的溶液, 然后干燥, 接着在高温 300~900°C下焙烧活化, 得到所述催化剂保存备用。
根据一个优选的制备二氧化钛改性的负载型铬钒双活性中心催化剂的方 法包含如下步骤:
i:)将含有钛和铬的溶液浸渍在无机载体上,浸渍时间为 l~12h,优选 4-8h, 浸渍温度为 10~80°C,优选 20~70°C,然后在 90~250°C之间干燥,优选 100~150 V , 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以采用真空; 将上述样品 在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧温度在 300~900°C, 优选 400~800°C, 时间为 l~10h, 优选 3~8h, 然后进行冷却, 在冷却至 300~400 °( 时切换成惰性气体如氮气或氩气等, 自然冷却, 在氮气保护下转移, 得到负 载有钛和铬的催化剂母体;
ϋ )将钒的盐溶液浸渍到上述负载有钛和铬的催化剂母体上, 浸渍时间为 l~12h, 优选 3-8h, 浸渍温度为 10~80°C, 优选 20~70°C, 然后在 90~250°C之 间干燥, 优选 100~150°C, 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以采 用真空; 将上述样品在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧 温度在 300~900°C, 优选 400~800°C, 时间为 l~10h, 优选 3~8h, 然后进行冷 却, 在冷却至 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却, 在氮 气保护下转移, 得到所述催化剂保存备用。
上述步骤 i ) 是将钛和铬负载于无机载体 (例如上文所述的无机载体) 上 的方法。 所述钛源可以是上文所述的钛源, 所述铬源可以是上文所述的铬源。 用于将铬源负载于载体上的方法可以是己知的任何可以将铬负载于载体上的 方法, 例如可以提及常规己知的制备 Phillips催化剂的方法。 根据一个实施方 案,在浸渍过程中,可以实施搅拌,优选连续搅拌。一般地,该搅拌持续约 1~12 小时, 优选约 4~8 小时。 根据一个实施方案, 钛负载量为催化剂总重量的 0.01~30wt% , 优选约 0.05~20wt¾; 铬的负载量为催化剂总重量的约 0.01~10wt % , 优选约 0.05~5wt%。 然后将得到的含有钛和铬的载体进行干燥, 该干燥通 常在大约室温到 20CTC的温度进行;例如在 15°C到 20CTC进行,优选 2CTC到 200 V , 进一步优选 100°C到 200°C。 根据一个实施方案, 该干燥在约 12CTC进行。 对该干燥进行的时间没有特别限定, 但是该干燥通常持续约 6~20小时, 优选 约 7~18小时, 进一步优选约 8~15小时。 在干燥完毕之后, 将含有钛和铬的无 机载体进行焙烧。 对焙烧进行的方式没有特别限定, 但是该焙烧优选在流化床 内进行。 根据一个实施方案, 该焙烧通常以两个阶段进行, 即低温阶段和高温 阶段。 该低温阶段通常在约 100~300°C进行。 该高温阶段通常在约 300°C~900 °C进行。 不受任何理论限制, 在所述低温阶段载体中吸附的物理水被除去, 而 在所述高温阶段无机载体上的部分羟基被除去。 根据一个实施方案, 所述低温 阶段持续 1~10小时, 优选 2~9小时。 根据另一个实施方案, 所述高温阶段持 续 1~10小时, 优选 2~9小时, 更优选 3~8小时。 根据一个实施方案, 所述低 温阶段在惰性气体或者空气气氛下进行, 优选惰性气体气体, 更优选在氮气气 氛下进行, 例如高纯氮气。 根据一个实施方案, 所述高温焙烧阶段在在惰性气 体或者空气中进行, 优选干燥高纯空气。 在所述焙烧结束后, 将得到的负载上 钛和铬的催化剂母体从高温阶段冷却。 根据一个实施方案, 在高温焙烧之后冷 却到 300~400°C的温度时, 可以切换气氛, 例如从空气变为惰性气体, 例如氮 气。 根据一个实施方案, 该冷却为自然降温冷却。 将得到的负载有钛和铬的催 化剂母体在惰性气体气氛下保存待用。
上述步骤 ii ) 是将钒源进一步负载于步骤 i ) 中制备的负载有钛和铬的催 化剂母体上。 用于将钒源负载于催化剂母体的方法可以是己知的任何可以将钒 负载于载体上的方法。 根据本发明的一个实施方案, 将钒源负载于预先负载有 钛和铬的催化剂母体上的方法包括用钒源溶液浸渍该催化剂母体。 根据一个实 施方案, 钒负载量为催化剂总重量的 0.01~10wt%, 优选约 0.05~5wt%。 根据一 个实施方案, 在浸渍过程中, 可以实施搅拌, 优选连续搅拌。 一般地, 该搅拌 持续约 1~12小时, 优选约 4~8小时, 浸渍温度为 10~80°C, 优选 20~70°C。 然 后将得到的样品进行干燥。 该干燥通常在大约室温〜 20CTC的温度进行; 例如在 大约 15~200°C进行, 优选 20~200°C, 进一步优选约 100~200°C。根据一个实施 方案, 该干燥在约 12CTC进行。 该干燥亦可在真空条件下进行。 对该干燥进行 的时间没有特别限定, 但是该干燥通常持续约 6~20小时, 优选约 7~18小时, 进一步优选约 8~15 小时。 在干燥完毕之后, 将所得样品进行焙烧。 对焙烧进 行的方式没有特别限定,但是该焙烧优选在流化床内进行。根据一个实施方案, 该焙烧通常以两个阶段进行, 即低温阶段和高温阶段。 低温阶段通常在约 100~300°C进行。 该高温阶段通常在约 300~900°C进行。 不受任何理论限制, 在 所述低温阶段将载体中吸附的物理水基本除去, 而在所述高温阶段将无机载体 上的部分羟基除去。 根据一个实施方案, 所述低温阶段持续 1~10小时, 优选 2-9个小时。 根据另一个实施方案, 所述高温阶段持续 1~10 小时, 优选 2~9 小时, 更优选 3~8小时。 根据一个实施方案, 所述低温阶段在惰性气体或者空 气气氛下进行, 优选在惰性气体气氛下进行, 所述惰性气体例如是以上所述的 惰性气体。根据一个实施方案,所述高温阶段焙烧在空气或者氧气条件下进行, 优选在干燥空气条件下进行。 在所述焙烧结束后, 将得到的负载上金属氧化物 的载体从高温阶段冷却。 根据一个实施方案, 在冷却到 300~400°C的温度时, 可以变换气氛, 例如从空气变为惰性气体, 例如氮气、 氩气等。 根据一个实施 方案, 该冷却为自然降温冷却, 得到催化剂在惰性气体下保存备用。
作为一个实例, 制备本发明催化剂的具体操作包括- 将硅胶浸渍在含有硫酸钛和三氧化铬的水溶液中, 钛负载量相对于催化剂 总重量符合本文的要求 (例如 0.05~20wt%, 以钛的重量计), 铬负载量符合本 文的要求 (例如为催化剂总重量的 0.1~2wt%, 以铬的重量计), 连续搅拌一定 时间 (例如 3~8小时) 后, 升温干燥; 然后在流化床内进行高温焙烧, 其中在 低温阶段 (例如 100°C~300°C ) 在氮气气氛中焙烧脱除载体中吸附的物理水, 在高温阶段(例如 300°C~900°C )在干燥空气中焙烧脱除载体表面的部分羟基, 在此高温阶段保持一定时间 (例如 3~8 个小时); 自然降温冷却, 在冷却到 300~400°C时切换为氮气保护, 在氮气保护下转移, 保存待用, 然后将得到的 催化剂母体浸渍在一定浓度的六氟钒酸铵的水溶液中, 钒负载量相对于催化剂 总重量符合本文的要求(例如 0.1~10wt%, 以钒的重量计); 在连续搅拌一定时 间 (例如 4~8小时) 后, 升温干燥; 将所得产物在流化床内进行高温焙烧, 其 中在低温阶段 (例如 100°C~300°C ) 在氮气气氛中焙烧脱除载体中吸附的物理 水, 在高温阶段 (例如 300°C~900°C ) 干燥空气中焙烧脱除载体表面的部分羟 基, 在此高温阶段保持一定时间 (例如 3~8个小时); 自然降温冷却, 在冷却 到 300~400°C时切换为氮气保护, 在氮气保护下转移, 得到催化剂保存待用。 本发明提供二氧化钛改性的负载型铬钒双活性中心催化剂的一种制备方 法包含如下步骤:
i ) 将无机载体浸渍含有钛、 钒和铬的溶液, 然后干燥;
ϋ ) 将步骤 i ) 所得的产物在高温 300~900°C下焙烧活化, 得到所述催化 剂保存备用。
根据一个优选的制备二氧化钛改性的负载型铬钒双活性中心催化剂的方 法包含如下步骤:
i ) 将含有钛、 钒和铬的盐溶液浸渍在无机载体上, 浸渍时间为 l~12h, 优选 4-8h, 浸渍温度为 10~80°C, 优选 20~70°C, 然后在 90~250°C之间干燥, 优选 100~150°C, 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以采用真空; ϋ )将上述样品在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧 温度在 300~900°C, 优选 400~800°C, 时间为 l~10h, 优选 3~8h, 然后进行冷 却, 在冷却至 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却, 在氮 气保护下转移, 得到催化剂在氮气保护下保存备用。
上述步骤 i ) 是将钛、 钒和铬同时浸渍于无机载体 (例如上文所述的无机 载体) 上的方法。 所述钛源可以是上文所述的钛源, 所述钒源可以是上文所述 的钒源,所述铬源可以是上文所述的铬源。根据一个实施方案,在浸渍过程中, 可以实施搅拌, 优选连续搅拌。 一般地, 该搅拌持续约 1~12小时, 优选约 4~8 小时。 根据一个实施方案, 钛负载量为催化剂总重量的 0.01~30wt%, 优选约 0.05~20wt%; 钒负载量为催化剂总重量的 0.01~10wt°/。, 优选约 0.05~5wt°/。; 铬 负载量为催化剂总重量的 0.01~10wt%, 优选约 0.05~5wt%。然后将得到的样品 进行干燥。 该干燥通常在大约室温到 20CTC的温度进行; 例如在 15°C到 20CTC 进行, 优选 2CTC到 200°C, 进一步优选 100°C到 200°C。 根据一个实施方案, 该干燥在约 12CTC进行。 对该干燥进行的时间没有特别限定, 但是该干燥通常 持续约 6~20小时, 优选约 7~18小时, 进一步优选约 8~15小时。
上述步骤 ii ) 是将含有钛、 钒和铬的无机载体进行焙烧。 对焙烧进行的方 式没有特别限定, 但是该焙烧优选在流化床内进行。 根据一个实施方案, 该焙 烧通常以两个阶段进行,即低温阶段和高温阶段。该低温阶段通常在约 100~300 °C进行。 该高温阶段通常在约 300°C~900°C进行。 不受任何理论限制, 在所述 低温阶段载体中吸附的物理水被除去, 而在所述高温阶段无机载体上的部分羟 基被除去。 根据一个实施方案, 所述低温阶段持续 1~10小时, 优选 2~9小时。 根据另一个实施方案, 所述高温阶段持续 1~10小时, 优选 2~9小时, 更优选 3~8小时。根据一个实施方案, 所述低温阶段在惰性气体或者空气气氛下进行, 优选惰性气体气体, 更优选在氮气气氛下进行, 例如高纯氮气。 根据一个实施 方案, 所述高温焙烧阶段在在惰性气体或者空气中进行, 优选干燥高纯空气。 在所述焙烧结束后, 将得到的负载上金属氧化物的载体从高温阶段冷却。 根据 一个实施方案, 在高温焙烧之后冷却到 300~400°C的温度时, 可以切换气氛, 例如从空气变为惰性气体, 例如氮气。 根据一个实施方案, 该冷却为自然降温 冷却。 将得到的催化剂在惰性气体气氛下保存待用。
作为一个实例, 制备本发明催化剂的具体操作包括- 将硅胶浸渍在含有硫酸钛、 草酸氧钒和三氧化铬的水溶液中, 钛负载量相 对于催化剂总重量符合本文的要求 (例如 0.05~20wt%, 以钛的重量计), 钒负 载量相对于催化剂总重量符合本文的要求 (例如 0.1~10wt%, 以钒的重量计), 铬负载量符合本文的要求 (例如 0.1~2wt%, 以铬的重量计), 连续搅拌一定时 间 (例如 3~8小时) 后, 升温干燥; 然后在流化床内进行高温焙烧, 其中低温 阶段 (例如 100°C~300°C ) 在氮气气氛中焙烧脱除载体中吸附的物理水, 高温 阶段 (例如 300°C~900°C ) 在干燥空气中焙烧脱除载体表面的部分羟基, 在此 高温阶段保持一定时间(例如 3~8个小时); 自然降温冷却, 在冷却到 300~400 °C时切换为氮气保护, 在氮气保护下转移, 得到催化剂保存待用。 本发明提供二氧化钛改性的负载型铬钒双活性中心催化剂的一种制备方 法包含如下步骤:
i )采用上述六种方法(包括先制备好二氧化钛改性的无机载体然后先载 钒再载铬、 铬钒同时负载、 先载铬再载钒以及钛和钒先同时负载再载铬、 钛和 铬先同时负载再载钒、 以及钛钒铬同时负载) 中任意一种方法制备出的二氧化 钛改性的铬钒双活性中心催化剂;
ϋ )在制备好的二氧化钛改性的负载型铬钒双活性中心催化剂中加入有机 金属助催化剂进行预还原活化处理, 然后进行干燥保存备用。
根据一个优选的制备二氧化钛改性的负载型铬钒双活性中心催化剂的方 法, 包含如下步骤:
i )采用上述六种方法中任一种制备出二氧化钛改性的负载型铬钒双活性 中心催化剂;
ϋ )在惰性气氛下将得到的催化剂加入有机金属助催化剂, 对催化剂进行 预还原活化处理, 然后在 60-12CTC之间干燥 2-8小时, 干燥过程中也可以采用 真空, 然后在惰性气体下保存待用。
一般地, 上述方法是对得到的二氧化钛改性的负载型铬钒双活性中心催化 剂进行预还原活化处理。 步骤 i ) 是用上述六种方法中的任一种方法制备出二 氧化钛改性的负载型铬钒双活性中心催化剂, 步骤 ϋ ) 是在惰性气氛下加入有 机金属助催化剂对该催化剂进行预还原活化处理, 上述有机金属助催化剂包括 有机铝化合物、 有机锂化合物、 有机硼化合物等本领域技术人员公知的用于烯 烃聚合反应的任何一种助催化剂或者是它们的组合。 根据一个实施方案, 用作 助催化剂的有机铝化合物可以包括三垸基铝 A1R3、 二垸基垸氧基铝 A1R20R、 二垸基卤化铝 A1R2X、 铝氧垸、 乙基倍半铝氯化物等等, 其中 R是垸基, 例如 具有 1一 12个碳原子的垸基, 例如是甲基、 乙基、 正丙基、 异丙基、 正丁基、 异丁基、 正戊基、 正己基、 正庚基、 正辛基、 正壬基、 正十二垸基等, X是卤 素, 例如氟、 氯、 溴和碘, 优选氯。 所述铝氧垸可以包括甲基铝氧垸 (MAO)等 所有垸基铝与水的反应物。 所述作为助催化剂的有机铝化合物可以单独使用或 两种或两种以上组合使用。 作为具体例子, 所述铝化合物可以提及三乙基铝、 三异丁基铝、 二乙基乙氧基铝、 一氯二乙基铝和甲基铝氧垸等。 根据一个实施 方案, 采用有机铝助催化剂对二氧化钛改性的负载型铬钒双活性中心催化剂进 行预还原活化处理时, 铝 /铬摩尔比在 0-1000之间, 优选 0-100, 更优选 0-50, 还原活化处理温度在室温 -locrc之间, 优选室温 -6o°c之间, 还原活化处理时间
0.5-20小时, 优选 0.5-10小时, 还原活化处理采用搅拌方式, 优选连续搅拌, 处理完毕后再在 60~120°C之间干燥 2~8小时, 干燥在惰性气体气氛下进行,例 如在氮气、 氦气、 氩气等气氛下进行, 优选在氮气气氛下进行, 该干燥过程也 可在真空条件下进行。 得到的经过预还原活化的二氧化钛改性的负载型铬钒双 活性中心催化剂在惰性气体气氛下保存待用。
作为一个实例, 制备本发明催化剂的具体操作包括- 将钛酸异丙酯溶于正己垸中配成溶液, 其中钛负载量相对于催化剂总重量 符合本文的要求(例如 0.05~20wt%, 以 Ti的重量计), 在上述溶液中加入硅胶 浸渍,在室温下连续搅拌一定时间后(例如 4~8h),然后在 70~150°C干燥 8~15h; 将干燥后的产物在流化床内进行高温焙烧, 其中在低温阶段(例如 100~300°C ) 在氮气气氛中焙烧脱除载体中的物理水, 在高温阶段 (例如 300°C~900°C ) 在 干燥空气中焙烧脱除载体表面的部分羟基, 在此高温阶段保持一定时间 (例如 3~8个小时); 自然降温冷却, 在冷却到 300~400°C时切换为氮气保护, 得到所 述二氧化钛改性的硅胶, 转移至广口瓶, 放在干燥器里保存备用。 将得到的二 氧化钛改性的硅胶浸渍在一定浓度的偏钒酸铵溶液中, 钒负载量相对于催化剂 总重量符合本文的要求(例如 0.1~10wt%, 以钒的重量计); 在连续搅拌一定时 间 (例如 4~8小时) 后, 升温干燥; 将含有偏钒酸铵的二氧化钛改性的硅胶在 流化床内进行高温焙烧, 其中在低温阶段 (例如 100°C~300°C ) 在氮气气氛中 焙烧脱除载体中吸附的物理水, 在高温阶段 (例如 300°C~900°C ) 在干燥空气 中焙烧脱除载体表面的部分羟基, 在此高温阶段保持一定时间 (例如 3~8个小 时); 自然降温冷却, 在冷却到 300~400°C时切换为氮气保护, 制得载钒的催化 剂母体。 然后, 将无机铬源负载在由上述方法制得的催化剂母体上, 铬负载量 符合本文的要求(例如为催化剂总重量的 0.1~3wt%, 以铬的重量计)连续搅拌 一定时间 (例如 3~8小时) 后, 升温干燥; 然后在流化床内进行高温焙烧, 其 中在低温阶段 (例如 100°C~300°C ) 在氮气气氛中焙烧脱除载体中吸附的物理 水, 在高温阶段 (例如 300°C~900°C ) 在干燥空气中焙烧脱除无机载体表面的 部分羟基, 在此高温阶段保持一定时间 (例如 3~8个小时); 自然降温冷却, 在冷却到 300~400°C时切换为氮气保护, 在氮气保护下转移, 保存待用。 然后 加入三乙基铝对催化剂进行预还原活化处理, 铝 /铬摩尔比在 0~50之间, 处理 温度在室温〜 6CTC, 连续搅拌 0.5~10小时, 然后再在 60~120°C之间干燥 2~8小 时, 该干燥在惰性气体气氛下进行, 例如在氮气、 氦气、 氩气等气氛下进行, 优选在氮气气氛下进行, 该干燥过程也可在真空条件下进行。 得到的经过预还 原活化的二氧化钛改性的负载型铬钒双活性中心催化剂在惰性气体气氛下保 存待用。 根据本发明的一个方面, 可以先制备氟改性的无机载体, 然后再负载铬和 钒活性组分得到催化剂, 其中所述的氟改性的无机载体制备方法如下- i )将氟化合物溶于溶剂中与无机载体搅拌混匀进行反应, 反应后将产物 进行干燥;
ϋ ) 将干燥后的产物在高温 200~900°C下焙烧, 得到所述氟改性的无机载 体。
根据一个优选的制备氟改性的无机载体的方法, 包含如下步骤- i ) 将氟化合物溶于溶剂, 然后浸渍在无机载体上, 浸渍时间为 l~12h, 优选 4~8h, 浸渍温度为 10~80°C, 优选 20~70°C, 然后在 50~200°C下干燥, 优 选 70~150°C, 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以采用真空干燥; ϋ )将上述样品在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧 温度在 200~900°C, 优选 400~800°C, 焙烧时间为 l~10h, 优选 4~6h, 然后进 行冷却, 其中在冷却到 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷 却。 将得到的氟改性的无机载体转移至广口瓶, 放在干燥器里保存备用。 上述步骤 i) 是将氟的化合物浸渍于无机载体(例如上文所述的无机载体) 上。 所述氟化合物同上述。 根据本发明的一个实施方案, 将氟化合物负载于无 机载体上的方法包括用氟化合物的溶液浸渍多孔无机载体。 根据一个实施方 案,在浸渍过程中,可以实施搅拌,优选连续搅拌。一般地,该搅拌持续约 l~12h, 优选约 4~8h, 浸渍温度为 10~80°C, 优选 20~70°C。 根据一个实施方案, 氟负 载量为催化剂总重量的 0.01~10wt%, 优选 0.5~5wt%。 然后将得到的浸渍有氟 化合物的载体进行干燥。 其中, 对干燥进行的时间没有特别限定, 但是该干燥 通常持续约 6~20h, 优选约 7~18h, 进一步优选约 8~15h。 干燥温度在室温〜 250 V , 优选 50~200°C, 进一步优选 70~150°C, 干燥过程中也可以采用真空干燥。
上述步骤 ii ) 是将浸渍有氟化合物的无机载体进行焙烧。 对焙烧进行的方 式没有特别限定, 但是该焙烧优选在流化床内进行。 根据一个实施方案, 该焙 烧通常以两个阶段进行, 即低温阶段和高温阶段。 低温阶段通常在约 100~300 °C进行。 该高温阶段通常在约 300~900°C进行。 不受任何理论限制, 在所述低 温阶段载体中吸附的物理水基本被除去, 而在所述高温阶段无机载体上的部分 羟基被除去。 根据一个实施方案, 所述低温阶段持续 1~10小时, 优选 2~9小 时, 更优选 3~8小时。 根据另一个实施方案, 所述高温阶段持续 1~10小时, 优选 2~9小时, 更优选 3~8小时。 根据一个实施方案, 所述低温阶段在惰性气 体或者空气气氛下进行, 优选在惰性气体气氛下进行, 所述惰性气体例如是氮 气、 氦气、 氩气等气氛, 优选在氮气气氛下进行, 例如高纯氮气。 根据一个实 施方案, 所述高温阶段焙烧在空气或者氧气条件下进行, 优选在干燥空气条件 下进行。 在所述焙烧结束后, 将得到的负载有氟的无机载体从高温阶段冷却。 根据一个实施方案, 在冷却到 300~400°C的温度时, 可以变换气氛, 例如从空 气变为惰性气体, 例如氮气、 氩气等。 根据一个实施方案, 该冷却为自然降温 冷却。 将得到的氟改性的无机载体转移至广口瓶, 放在干燥器里保存备用。
作为一个实例, 采用上述方法制备本发明氟改性的无机载体的具体操作包 括:
将六氟硅酸铵溶于水中配成溶液, 其中氟负载量相对于催化剂总重量符合 本文的要求 (例如 0.01-10%, 以 F的重量计), 在上述溶液中加入硅胶浸渍, 在室温下连续搅拌一定时间后 (例如 4~8h), 然后在 70~150°C干燥 8~15h; 将 干燥后的产物在流化床内进行高温焙烧, 其中在低温阶段 (例如 100~300°C ) 在氮气气氛中焙烧脱除载体中的物理水, 在高温阶段 (例如 300°C~900°C ) 在 干燥空气中焙烧脱除载体表面的部分羟基, 在此高温阶段保持一定时间 (例如 3~8个小时); 自然降温冷却, 在冷却到 300~400°C时切换为氮气保护, 得到所 述氟改性的硅胶, 转移至广口瓶, 放在干燥器里保存备用。 根据本发明的一个方面, 本发明提供以下制备氟改性的负载型铬钒双活性 中心催化剂的方法, 其中一种方法包含如下步骤- i ) 按照上述制备氟改性的无机载体的方法制备出氟改性的无机载体; ϋ ) 将步骤 i ) 得到的氟改性的无机载体浸渍含有钒的溶液, 然后干燥, 接着在高温 300~900°C下焙烧活化;
iii ) 将步骤 ii ) 所得的产物浸渍含有铬的溶液, 然后干燥, 接着在高温 300~900°C下焙烧活化, 得到所述催化剂保存备用。
根据一个优选的制备氟负载型铬钒双活性中心催化剂的方法, 包含如下步 骤:
i ) 按照上述制备氟改性的无机载体方法制备出氟改性的无机载体; ϋ ) 将钒的盐溶液浸渍在氟改性的无机载体上, 浸渍时间为 l~12h, 优选 4~8h, 浸渍温度为 10~80°C, 优选 20~70°C, 然后在 90~250°C下干燥, 优选 100~200°C , 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以采用真空干燥; 将上述样品在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧温度在 300-900 °C , 优选 400~800°C, 时间为 l~10h, 优选 4~6h, 然后进行冷却, 其中 在冷却到 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却;
iii ) 将铬的盐溶液浸渍在上述负载有钒的催化剂母体上, 浸渍时间为 l~12h, 优选 4~8h, 浸渍温度为 10~80°C, 优选 15~60°C, 然后在 90~250°C之 间干燥, 优选 100~150°C, 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以采 用真空; 将上述样品在惰性气体或者氧气或者空气中进行焙烧活化, 焙烧温度 在 300~900°C, 优选 400~800°C, 时间为 l~10h, 优选 3~8h, 然后进行冷却, 在冷却至 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却, 得到所述 催化剂保存备用。
上述步骤 i )是按照上述制备氟改性的无机载体的方法制备出氟改性的无 机载体。 步骤 ϋ ) 是将钒源负载于氟改性的无机载体 (例如上文所述的氟改性 的无机载体) 上。 用于将钒源负载于氟改性的无机载体上的方法可以是己知的 任何可以将钒负载于载体上的方法。 根据本发明的一个实施方案, 将钒源负载 于氟改性的无机载体上的方法包括用钒源溶液浸渍该氟改性的无机载体。 根据 一个实施方案, 在浸渍过程中, 可以实施搅拌, 优选连续搅拌。 一般地, 该搅 拌持续约 l~12h, 优选约 4~8h, 浸渍温度为 10~80V, 优选 20~70°C。 根据一 个实施方案, 钒负载量为催化剂总重量的 0.01~10wt%, 优选约 0.05~5wt%。 然 后将得到的浸渍有钒组分的氟改性的载体进行干燥。 该干燥通常在室温〜 25CTC 进行, 优选在 90~250°C, 进一步优选 100~200°C。 根据一个实施方案, 该干燥 在约 12CTC进行。 该干燥亦可在真空条件下进行。 对该干燥进行的时间没有特 别限定, 但是该干燥通常持续 6~20h, 优选 7~18h, 进一步优选 8~15h。 在干燥 完毕之后, 将含有钒组分的氟改性的无机载体进行焙烧。 对焙烧进行的方式没 有特别限定, 但是该焙烧优选在流化床内进行。 根据一个实施方案, 该焙烧通 常以两个阶段进行, 即低温阶段和高温阶段。 低温阶段通常在约 100~300°C进 行。 该高温阶段通常在约 300~900°C进行。 不受任何理论限制, 在所述低温阶 段载体中吸附的物理水基本被除去, 而在所述高温阶段无机载体上的部分羟基 被除去。 根据一个实施方案, 所述低温阶段持续 1~10小时, 优选 2~9小时, 更优选 3~8小时。 根据另一个实施方案, 所述高温阶段持续 1~10小时, 优选 2~9小时, 更优选 3~8小时。 根据一个实施方案, 所述低温阶段在惰性气体或 者空气气氛下进行, 优选在惰性气体气氛下进行, 所述惰性气体例如是氮气、 氦气、 氩气等气氛, 优选在氮气气氛下进行, 例如高纯氮气。 根据一个实施方 案, 所述高温阶段焙烧在空气或者氧气条件下进行, 优选在干燥空气条件下进 行。 在所述焙烧结束后, 将得到的负载有钒的催化剂母体从高温阶段冷却。 根 据一个实施方案, 在冷却到 300~400°C的温度时, 可以变换气氛, 例如从空气 变为惰性气体, 例如氮气、 氩气等。 根据一个实施方案, 该冷却为自然降温冷 却。
上述步骤 iii ) 是将无机铬源负载于步骤 ii ) 中制备的负载有钒的催化剂母 体上。 用于将无机铬源负载于催化剂母体上的方法可以是本领域技术人员己知 的任何可以将铬负载于载体上的方法, 例如可以提及常规己知的制备 Phillips 催化剂的方法。 所述铬源可以是上文所述的无机铬源。 根据一个实施方案, 在 浸渍过程中, 可以实施搅拌, 优选连续搅拌。 一般地, 该搅拌持续 1~12小时, 优选 4~8小时。 根据一个实施方案, 铬的负载量为催化剂总重量的 0.01~10wt % , 优选 0.05~5wt%, 进一步优选 0.1~3wt%。 然后将得到的样品进行干燥。 该干燥通常在室温到 200°C的温度进行; 例如在 15°C到 25CTC进行,优选在 90 到 250°C, 进一步优选在 10CTC到 200°C。 根据一个实施方案, 该干燥在约 12CTC进行。 对该干燥进行的时间没有特别限定, 但是该干燥通常持续 6~20小 时, 优选 7~18小时, 进一步优选 8~15小时。 在干燥完毕之后, 将所得样品进 行焙烧。 对焙烧进行的方式没有特别限定, 但是该焙烧优选在流化床内进行。 根据一个实施方案, 该焙烧通常以两个阶段进行, 即低温阶段和高温阶段。 该 低温阶段通常在 100~300°C进行。 该高温阶段通常在 300~900°C进行。 不受任 何理论限制, 在所述低温阶段载体中吸附的物理水被除去, 而在所述高温阶段 无机载体上的部分羟基被除去。 根据一个实施方案, 所述低温阶段持续 1~10 小时, 优选 2~8小时。 根据一个实施方案, 所述高温阶段持续 1~10小时, 优 选 2~9小时, 更优选 3~8个小时。 根据一个实施方案, 所述低温阶段在惰性气 体或者空气气氛下进行, 优选在惰性气体下进行, 所述惰性气体例如氮气、 氦 气、氩气等气氛, 优选在氮气气氛下进行, 例如高纯氮气。根据一个实施方案, 所述高温阶段焙烧在空气或者氧气条件下进行, 优选在干燥空气条件下进行。 在所述焙烧结束后, 将得到的负载上金属氧化物的氟改性的无机载体从高温阶 段冷却。 根据一个实施方案, 在高温焙烧之后冷却到 300~400°C的温度时, 可 以变换气氛, 例如从空气变为惰性气体, 例如氮气等。 根据一个实施方案, 该 冷却为自然降温冷却。 将得到的催化剂在惰性气体气氛下保存备用。
作为一个实例, 制备本发明催化剂的具体操作包括- 按照上述制备氟改性的无机载体方法中的任一种方法制备出氟改性的无 机载体如氟改性的硅胶, 其中氟负载量相对于催化剂总重量符合本文的要求 (例如 0.01~10wt%, 以 F的重量计)。 将制备好的氟改性的硅胶浸渍在偏钒酸 铵的水溶液中, 钒负载量符合本文的要求 (例如为催化剂总重量的 0.1~2wt%, 以钒的重量计) 连续搅拌一定时间 (例如 3~8小时) 后, 升温干燥; 然后在流 化床内进行高温焙烧, 其中在低温阶段 (例如 100°C~300°C ) 在氮气气氛中焙 烧脱除载体中吸附的物理水, 在高温阶段 (例如 300°C~900°C ) 在干燥空气中 焙烧脱除无机载体表面的部分羟基, 在此高温阶段保持一定时间 (例如 3~8个 小时); 自然降温冷却, 在冷却到 300~400°C时切换为氮气保护, 在氮气保护下 转移, 保存待用, 然后将得到的负载有钒的催化剂母体浸渍在一定浓度的碱式 醋酸铬的水溶液中, 铬负载量相对于催化剂总重量符合本文的要求 (例如
0.1~10wt%, 以铬的重量计); 在连续搅拌一定时间 (例如 4~8小时) 后, 升温 干燥; 将所得样品在流化床内进行高温焙烧, 其中低温阶段 (例如 100°C~300 °C ) 在氮气气氛中焙烧脱除载体中吸附的物理水, 高温阶段 (例如 300°C~900 °C ) 在干燥空气中焙烧脱除硅胶表面的部分羟基, 在此高温阶段保持一定时间 (例如 3~8个小时); 自然降温冷却, 在冷却到 300~400°C时切换为氮气保护, 在氮气保护下转移, 得到催化剂保存待用。 本发明提供氟改性的负载型铬钒金属氧化物双活性中心催化剂的一种制 备方法包含如下步骤:
i )按照上述制备氟改性的无机载体方法中的任一种方法制备出氟改性的 无机载体;
ϋ ) 将步骤 i ) 得到的氟改性的无机载体浸渍含有钒和铬的溶液, 然后干 燥;
iii ) 将步骤 ii ) 所得的产物在高温 300°C~900°C下焙烧活化, 得到所述催 化剂保存备用。
根据一个优选的制备氟改性的负载型铬钒双活性中心催化剂的方法包含 如下步骤:
i )按照上述制备氟改性的无机载体方法中的任一种方法制备出氟改性的 无机载体;
ϋ )将含有铬和钒的混合盐溶液共同浸渍在步骤 i ) 中得到的氟改性的无 机载体上, 浸渍时间为 l~12h, 优选 4~8h, 浸渍温度为 10~80°C, 优选 20~70 V ,然后在 90~250°C之间干燥,优选 100~200°C,干燥时间 6~20h,优选 8~15h, 干燥过程中也可以采用真空;
iii)将上述样品在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧 温度在 300~900°C, 优选 400~800°C, 时间为 l~10h, 优选 3~8h, 然后进行冷 却, 在冷却至 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却, 得到 所述催化剂保存备用。
上述步骤 i )是按照上述制备氟改性的无机载体方法中的任一种方法制备 出氟改性的无机载体。 上述步骤 ii ) 是将铬源和钒源同时浸渍于氟改性的无机 载体 (上文所述的氟改性的无机载体) 上的方法。 所述铬源可以是上文所述的 任何铬源, 钒源可以是上文所述的任何钒源。 根据一个实施方案, 在浸渍过程 中, 可以实施加热搅拌, 优选连续加热搅拌。 一般地, 该搅拌持续约 1~12小 时, 优选约 4~8小时, 浸渍温度为 10~80°C, 优选 20~70°C。 根据一个实施方 案, 铬的负载量为催化剂总重量的 0.01~10wt%, 优选 0.05~5wt% ; 钒负载量 为催化剂总重量的 0.01~10wt%, 优选约 0.05~5wt%。然后将得到的样品进行干 燥。 该干燥通常在室温〜 25CTC的温度进行, 优选 90°C~250°C, 进一步优选 100 °C~200°C。 对该干燥进行的时间没有特别限定, 但是该干燥通常持续 6~20小 时, 优选 7~18小时, 进一步优选 8~15小时, 干燥过程中也可以采用真空。
上述步骤 iii ) 是在干燥完毕之后, 将浸渍有铬和钒化合物的氟改性的载体 进行焙烧, 并最终将铬钒氧化物负载于载体表面。 对焙烧进行的方式没有特别 限定, 但是该焙烧优选在流化床内进行。 根据一个实施方案, 该焙烧通常以两 个阶段进行, 即低温阶段和高温阶段。 该低温阶段通常在 100~300°C进行。 该 高温阶段通常在 300~900°C进行。 不受任何理论限制, 在所述低温阶段载体中 吸附的物理水被除去, 而在所述高温阶段的载体上的部分羟基被除去。 根据一 个实施方案, 所述低温阶段持续 1~10小时, 优选 2~9个小时。 根据另一个实 施方案, 所述高温阶段持续 1~10个小时, 优选 2~9个小时, 更优选 3~8个小 时。 根据一个实施方案, 所述低温阶段在惰性气体或者空气气氛下进行, 优选 在惰性气体下进行, 所述惰性气体例如氮气、 氦气、 氩气等气氛, 优选在氮气 气氛下进行, 例如高纯氮气。 根据一个实施方案, 所述高温阶段焙烧在空气或 者氧气条件下进行, 优选在干燥空气条件下进行。 在所述焙烧结束后, 将得到 的负载上金属氧化物的氟改性的无机载体从高温阶段冷却。 根据一个实施方 案, 在高温焙烧之后冷却到 300~400°C的温度时, 可以变换气氛, 例如从空气 变为惰性气体, 例如氮气。 根据一个实施方案, 该冷却为自然降温冷却。 将得 到的催化剂在惰性气体气氛下保存备用。
作为一个实例, 制备本发明催化剂的具体操作包括- 按照上述制备氟改性的无机载体方法中的任一种方法制备出氟改性的无 机载体如氟改性的硅胶, 其中氟负载量相对于催化剂总重量符合本文的要求 (例如 0.01~10wt%, 以 F的重量计); 将所得氟改性的硅胶浸渍在一定浓度的 偏钒酸铵和碱式醋酸铬的水溶液中, 钒和铬的负载量相对于催化剂总重量符合 本文的要求 (例如钒 0.1~10wt%, 铬 0.1~3wt%, 分别以钒和铬的重量计); 在 连续搅拌一定时间 (例如 4~8小时) 后, 升温干燥; 然后在流化床内进行高温 焙烧, 其中在低温阶段 (例如 100°C~300°C ) 在氮气气氛中焙烧脱除载体中吸 附的物理水, 在高温阶段 (例如 300°C~900°C ) 在干燥空气中焙烧脱除无机载 体表面的部分羟基, 在此高温阶段保持一定时间 (例如 3~8个小时); 自然降 温冷却, 在冷却到 300~400°C时切换为氮气保护, 在氮气保护下转移, 催化剂 保存备用。 本发明提供氟改性的负载型铬钒双活性中心催化剂的一种制备方法包含 如下步骤:
i )按照上述制备氟改性的无机载体方法中的任一种方法制备出氟改性的 无机载体;
ϋ ) 将步骤 i ) 所得的氟改性的无机载体浸渍含有铬的溶液, 然后干燥, 接着在高温 300°C~900°C下焙烧活化;
iii)将步骤 ii )所得的产物浸渍含有钒的溶液,然后干燥,接着在高温 300 °C~900°C下焙烧活化, 得到催化剂保存备用。
根据一个优选的制备氟改性的负载型铬钒双活性中心催化剂的方法包含 如下步骤:
i )按照上述制备氟改性的无机载体方法中的任一种方法制备出氟改性的 无机载体;
ϋ ) 将铬的盐溶液浸渍在步骤 i ) 所得的氟改性的无机载体上, 浸渍时间 为 l~12h, 优选 4-8h, 浸渍温度为 10~80°C, 优选 20~70°C, 然后在 90~250°C 之间干燥, 优选 100~150°C, 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以 采用真空; 将上述样品在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙 烧温度在 300~900°C, 优选 400~800°C, 时间为 l~10h, 优选 3~8h, 然后进行 冷却, 在冷却至 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却, 得 到负载有铬的催化剂母体;
iii ) 将钒的盐溶液浸渍到上述负载有铬的催化剂母体上, 浸渍时间为 l~12h, 优选 3-8h, 浸渍温度为 10~80°C, 优选 20~70°C, 然后在 90~250°C之 间干燥, 优选 100~150°C, 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以采 用真空; 将上述样品在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧 温度在 300~900°C, 优选 400~800°C, 时间为 l~10h, 优选 3~8h, 然后进行冷 却, 在冷却至 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却, 得到 所述催化剂保存备用。
上述步骤 i )是按照上述制备氟改性的无机载体方法中的任一种方法制备 出氟改性的无机载体; 上述步骤 ii ) 是将铬源负载于氟改性的无机载体 (例如 上文所述的氟改性的无机载体) 上的方法。 用于将铬源负载于氟改性的无机载 体上的方法可以是本领域技术人员己知的任何可以将铬负载于载体上的方法, 例如可以提及常规己知的制备 Phillips催化剂的方法。 所述铬源可以是上文所 述的任何铬源。 根据一个实施方案, 在浸渍过程中, 可以实施搅拌, 优选连续 搅拌。 一般地, 该搅拌持续 1~12小时, 优选 4~8小时。 根据一个实施方案, 铬的负载量为催化剂总重量的 0.01~10wt%, 优选 0.05~5wt%, 进一步优选 0.1~2wt%。 然后将得到的样品进行干燥。 该干燥通常在室温到 20CTC的温度进 行; 例如在 15°C到 20CTC进行, 优选 2CTC到 200°C, 进一步优选 100°C到 200 °C。 根据一个实施方案, 该干燥在约 12CTC进行。 对该干燥进行的时间没有特 别限定, 但是该干燥通常持续 6~20小时, 优选 7~18小时, 进一步优选 8~15 小时。 在干燥完毕之后, 将含有铬的氟改性的无机载体进行焙烧。 对焙烧进行 的方式没有特别限定, 但是该焙烧优选在流化床内进行。 根据一个实施方案, 该焙烧通常以两个阶段进行, 即低温阶段和高温阶段。 该低温阶段通常在 100~300°C进行。 该高温阶段通常在 300°C~900°C进行。 不受任何理论限制, 在 所述低温阶段载体中吸附的物理水被除去, 而在所述高温阶段无机载体上的部 分羟基被除去。 根据一个实施方案, 所述低温阶段持续 1~10 小时, 优选 2~9 小时。 根据另一个实施方案, 所述高温阶段持续 1~10小时, 优选 2~9小时, 更优选 3~8小时。 根据一个实施方案, 所述低温阶段在惰性气体或者空气气氛 下进行, 优选惰性气体气体, 更优选在氮气气氛下进行, 例如高纯氮气。 根据 一个实施方案, 所述高温焙烧阶段在在惰性气体或者空气中进行, 优选干燥空 气。 在所述焙烧结束后, 将得到的负载有铬的催化剂母体从高温阶段冷却。 根 据一个实施方案, 在高温焙烧之后冷却到 300~400°C的温度时, 可以切换气氛, 例如从空气变为惰性气体, 例如氮气。 根据一个实施方案, 该冷却为自然降温 冷却。 将得到的催化剂母体在惰性气体气氛下保存待用。
上述步骤 iii ) 是将钒源进一步负载于步骤 ii ) 中制备的负载有铬的催化剂 母体上。 用于将钒源负载于催化剂母体上的方法可以是己知的任何可以将钒负 载于载体上的方法。 根据本发明的一个实施方案, 将钒源负载于催化剂母体上 的方法包括用钒源溶液浸渍该催化剂母体。 所述钒源可以是上文所述的任何钒 源。 根据一个实施方案, 在浸渍过程中, 可以实施搅拌, 优选连续搅拌。 一般 地, 该搅拌持续 1~12小时, 优选 4~8小时, 浸渍温度为 10~80°C, 优选 20~70 °C。 根据一个实施方案, 钒负载量为催化剂总重量的 0.01~10wt%, 优选 0.05~5wt%。 然后将得到的样品进行干燥。 该干燥通常在室温〜 20CTC的温度进 行; 例如在 15~200°C进行, 优选 20~200°C, 进一步优选 100~200°C。 根据一个 实施方案, 该干燥在约 12CTC进行。 该干燥亦可在真空条件下进行。 对该干燥 进行的时间没有特别限定, 但是该干燥通常持续 6~20小时, 优选 7~18小时, 进一步优选 8~15 小时。 在干燥完毕之后, 将浸渍有钒组分的样品进行焙烧。 对焙烧进行的方式没有特别限定, 但是该焙烧优选在流化床内进行。 根据一个 实施方案, 该焙烧通常以两个阶段进行, 即低温阶段和高温阶段。 低温阶段通 常在 100~300°C进行。 该高温阶段通常在 300~900°C进行。 不受任何理论限制, 在所述低温阶段将载体中吸附的物理水基本除去, 而在所述高温阶段将无机载 体上的部分羟基除去。 根据一个实施方案, 所述低温阶段持续 1~10小时, 优 选 2~9个小时。根据另一个实施方案, 所述高温阶段持续 1~10小时, 优选 2~9 小时, 更优选 3~8小时。 根据一个实施方案, 所述低温阶段在惰性气体或者空 气气氛下进行, 优选在惰性气体气氛下进行, 所述惰性气体例如是以上所述的 惰性气体。根据一个实施方案,所述高温阶段焙烧在空气或者氧气条件下进行, 优选在干燥空气条件下进行。 在所述焙烧结束后, 将得到的得到的负载上金属 氧化物的载体从高温阶段冷却。 根据一个实施方案, 在冷却到 300~400°C的温 度时, 可以变换气氛, 例如从空气变为惰性气体, 例如氮气、 氩气等。 根据一 个实施方案, 该冷却为自然降温冷却, 得到催化剂保存备用。
作为一个实例, 制备本发明催化剂的具体操作包括- 按照上述制备氟改性的无机载体方法中的任一种方法制备出氟改性的无 机载体如氟改性的硅胶, 其中氟负载量相对于催化剂总重量符合本文的要求 (例如 0.01~10wt%, 以 F的重量计)。 将制备好的氟改性的硅胶浸渍在无机铬 源的水溶液中, 铬负载量符合本文的要求 (例如为催化剂总重量的 0.1~2wt%, 以铬的重量计) 连续搅拌一定时间 (例如 3~8小时) 后, 升温干燥; 然后在流 化床内进行高温焙烧, 其中在低温阶段 (例如 100°C~300°C ) 在氮气气氛中焙 烧脱除载体中吸附的物理水, 在高温阶段 (例如 300°C~900°C ) 在干燥空气中 焙烧脱除无机载体表面的部分羟基, 在此高温阶段保持一定时间 (例如 3~8个 小时); 自然降温冷却, 在冷却到 300~400°C时切换为氮气保护, 在氮气保护下 转移, 保存待用, 然后将得到的负载有铬的催化剂母体浸渍在一定浓度的偏钒 酸铵溶液中,钒负载量相对于催化剂总重量符合本文的要求(例如 0.1~10wt%, 以钒的重量计); 在连续搅拌一定时间 (例如 4~8小时) 后, 升温干燥; 将所 得样品在流化床内进行高温焙烧, 其中低温阶段 (例如 100°C~300°C ) 在氮气 气氛中焙烧脱除载体中吸附的物理水, 高温阶段 (例如 300°C~900°C ) 在干燥 空气中焙烧脱除硅胶表面的部分羟基, 在此高温阶段保持一定时间 (例如 3~8 个小时); 自然降温冷却, 在冷却到 300~400°C时切换为氮气保护, 在氮气保护 下转移, 得到催化剂保存待用。 本发明提供氟改性的负载型铬钒双活性中心催化剂的一种制备方法包含 如下步骤:
i ) 将无机载体浸渍含有氟和钒的溶液, 然后干燥, 接着在高温 300~900 °C下焙烧活化;
ϋ ) 将步骤 i ) 所得的产物浸渍含有铬的溶液, 然后干燥, 接着在高温 300~900°C下焙烧活化, 得到所述催化剂保存备用。
根据一个优选的制备氟改性的负载型铬钒双活性中心催化剂的方法包含 如下步骤:
i ) 将含有氟和钒的盐溶液浸渍在无机载体上, 浸渍时间为 l~12h, 优选 4-8h, 浸渍温度为 10~80°C, 优选 20~70°C, 然后在 90~250°C之间干燥, 优选 100~150°C, 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以采用真空; 将上 述样品在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧温度在 300-900 °C , 优选 400~800°C, 时间为 l~10h, 优选 3~8h, 然后进行冷却, 在冷 却至 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却, 得到负载有氟 和钒的催化剂母体; ϋ )将铬的盐溶液浸渍到上述负载有氟和钒的催化剂母体上, 浸渍时间为 l~12h, 优选 3-8h, 浸渍温度为 10~80°C, 优选 20~70°C, 然后在 90~250°C之 间干燥, 优选 100~150°C, 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以采 用真空; 将上述样品在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧 温度在 300~900°C, 优选 400~800°C, 时间为 l~10h, 优选 3~8h, 然后进行冷 却, 在冷却至 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却, 得到 所述催化剂保存备用。
上述步骤 i ) 是将氟和钒负载于无机载体 (例如上文所述的无机载体) 上 的方法。 所述氟源可以是上文所述的任何氟源, 所述钒源可以是上文所述的任 何钒源。 根据一个实施方案, 在浸渍过程中, 可以实施搅拌, 优选连续搅拌。 一般地, 该搅拌持续 1~12小时, 优选 4~8小时。 根据一个实施方案, 氟负载 量为催化剂总重量的 0.01~10wt%, 优选 0.5-2 wt %; 钒负载量为催化剂总重量 的 0.01~10wt%, 优选 0.05~5wt%。 然后将得到的样品进行干燥。 该干燥通常在 室温到 20CTC的温度进行; 例如在 15°C到 20CTC进行, 优选 2CTC到 20CTC, 进 一步优选 100°C到 200°C。 根据一个实施方案, 该干燥在约 12CTC进行。 对该 干燥进行的时间没有特别限定, 但是该干燥通常持续 6~20小时, 优选 7~18小 时, 进一步优选 8~15小时。 在干燥完毕之后, 将含有氟和钒的载体进行焙烧。 对焙烧进行的方式没有特别限定, 但是该焙烧优选在流化床内进行。 根据一个 实施方案, 该焙烧通常以两个阶段进行, 即低温阶段和高温阶段。 该低温阶段 通常在 100~300°C进行。 该高温阶段通常在 300°C~900°C进行。 不受任何理论 限制, 在所述低温阶段载体中吸附的物理水被除去, 而在所述高温阶段无机载 体上的部分羟基被除去。 根据一个实施方案, 所述低温阶段持续 1~10小时, 优选 2~9小时。根据另一个实施方案, 所述高温阶段持续 1~10小时, 优选 2~9 小时, 更优选 3~8小时。 根据一个实施方案, 所述低温阶段在惰性气体或者空 气气氛下进行, 优选惰性气体气体, 更优选在氮气气氛下进行,例如高纯氮气。 根据一个实施方案, 所述高温焙烧阶段在在惰性气体或者空气中进行, 优选干 燥空气。 在所述焙烧结束后, 将得到的负载有氟和钒的催化剂母体从高温阶段 冷却。 根据一个实施方案, 在高温焙烧之后冷却到 300~400°C的温度时, 可以 切换气氛, 例如从空气变为惰性气体, 例如氮气。 根据一个实施方案, 该冷却 为自然降温冷却。 将得到的催化剂母体在惰性气体气氛下保存待用。 上述步骤 ii ) 是将铬源进一步负载于步骤 i ) 中制备的负载有氟和钒的催 化剂母体上。 用于将铬源负载于催化剂母体上的方法可以是己知的任何可以将 铬负载于载体上的方法, 例如可以提及常规己知的制备 Phillips催化剂的方法。 根据本发明的一个实施方案, 将铬源负载于预先负载有氟和钒的催化剂母体上 的方法包括用含有铬的溶液浸渍该催化剂母体。 根据一个实施方案, 铬的负载 量为催化剂总重量的 0.01~10wt%, 优选 0.05~5wt%, 进一步优选 0.1~2wt%。 根据一个实施方案, 在浸渍过程中, 可以实施搅拌, 优选连续搅拌。 一般地, 该搅拌持续 1~12小时, 优选 4~8小时, 浸渍温度为 10~80°C, 优选 20~70°C。 然后将得到的浸渍有铬组分的催化剂母体进行干燥。 该干燥通常在室温〜 20CTC 的温度进行; 例如在 15~200°C进行, 优选 20~200°C, 进一步优选 100~200°C。 根据一个实施方案, 该干燥在约 12CTC进行。 该干燥亦可在真空条件下进行。 对该干燥进行的时间没有特别限定,但是该干燥通常持续 6~20小时,优选 7~18 小时, 进一步优选 8~15 小时。 在干燥完毕之后, 将浸渍有铬组分的样品进行 焙烧。 对焙烧进行的方式没有特别限定, 但是该焙烧优选在流化床内进行。 根 据一个实施方案, 该焙烧通常以两个阶段进行, 即低温阶段和高温阶段。 低温 阶段通常在 100~300°C进行。 该高温阶段通常在 300~900°C进行。 不受任何理 论限制, 在所述低温阶段将载体中吸附的物理水基本除去, 而在所述高温阶段 将无机载体上的部分羟基除去。 根据一个实施方案, 所述低温阶段持续 1~10 小时, 优选 2~9个小时。 根据另一个实施方案, 所述高温阶段持续 1~10小时, 优选 2~9小时, 更优选 3~8小时。 根据一个实施方案, 所述低温阶段在惰性气 体或者空气气氛下进行, 优选在惰性气体气氛下进行, 所述惰性气体例如是以 上所述的惰性气体。 根据一个实施方案, 所述高温阶段焙烧在空气或者氧气条 件下进行, 优选在干燥空气条件下进行。 在所述焙烧结束后, 将得到的负载上 金属氧化物的载体从高温阶段冷却。 根据一个实施方案, 在冷却到 300~400°C 的温度时, 可以变换气氛, 例如从空气变为惰性气体, 例如氮气、 氩气等。 根 据一个实施方案,该冷却为自然降温冷却,得到催化剂在惰性气体下保存备用。
作为一个实例, 制备本发明催化剂的具体操作包括- 将硅胶浸渍在含有六氟硅酸铵和草酸氧钒的水溶液中, 氟负载量相对于催 化剂总重量符合本文的要求 (例如 0.01~10wt%, 以氟的重量计), 钒负载量相 对于催化剂总重量符合本文的要求(例如 0.1~10wt%, 以钒的重量计), 连续搅 拌一定时间 (例如 3~8小时) 后, 升温干燥; 然后在流化床内进行高温焙烧, 其中在低温阶段 (例如 100°C~300°C ) 在氮气气氛中焙烧脱除载体中吸附的物 理水, 在高温阶段 (例如 300°C~900°C ) 在干燥空气中焙烧脱除载体表面的部 分羟基, 在此高温阶段保持一定时间 (例如 3~8个小时); 自然降温冷却, 在 冷却到 300~400°C时切换为氮气保护, 在氮气保护下转移, 保存待用, 然后将 得到的催化剂母体浸渍在一定浓度的碱式醋酸铬的水溶液中, 铬负载量符合本 文的要求 (例如为催化剂总重量的 0.1~2wt%, 以铬的重量计); 在连续搅拌一 定时间(例如 4~8小时)后, 升温干燥; 将所得产物在流化床内进行高温焙烧, 其中低温阶段 (例如 100°C~300°C ) 在氮气气氛中焙烧脱除载体中吸附的物理 水, 高温阶段 (例如 300°C~900°C ) 在干燥空气中焙烧脱除载体表面的部分羟 基, 在此高温阶段保持一定时间 (例如 3~8个小时); 自然降温冷却, 在冷却 到 300~400°C时切换为氮气保护, 在氮气保护下转移, 得到催化剂保存待用。 本发明提供氟改性的负载型铬钒双活性中心催化剂的一种制备方法包含 如下步骤:
i ) 将无机载体浸渍含有氟和铬的溶液, 然后干燥, 接着在高温 300~900 °C下焙烧活化;
ϋ ) 将步骤 i ) 所得的产物浸渍含有钒的溶液, 然后干燥, 接着在高温 300~900°C下焙烧活化, 得到所述催化剂保存备用。
根据一个优选的制备氟改性的负载型铬钒双活性中心催化剂的方法包含 如下步骤:
i:)将含有氟和铬的溶液浸渍在无机载体上,浸渍时间为 l~12h,优选 4-8h, 浸渍温度为 10~80°C,优选 20~70°C,然后在 90~250°C之间干燥,优选 100~150 V , 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以采用真空; 将上述样品 在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧温度在 300~900°C, 优选 400~800°C, 时间为 l~10h, 优选 3~8h, 然后进行冷却, 在冷却至 300~400 °( 时切换成惰性气体如氮气或氩气等, 自然冷却, 在氮气保护下转移, 得到负 载有氟和铬的催化剂母体;
ϋ )将钒的盐溶液浸渍到上述负载有氟和铬的催化剂母体上, 浸渍时间为 l~12h, 优选 3-8h, 浸渍温度为 10~80°C, 优选 20~70°C, 然后在 90~250°C之 间干燥, 优选 100~150°C, 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以采 用真空; 将上述样品在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧 温度在 300~900°C, 优选 400~800°C, 时间为 l~10h, 优选 3~8h, 然后进行冷 却, 在冷却至 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却, 在氮 气保护下转移, 得到所述催化剂保存备用。
上述步骤 i ) 是将氟和铬负载于无机载体 (例如上文所述的无机载体) 上 的方法。 所述氟源可以是上文所述的氟源, 所述铬源可以是上文所述的铬源。 用于将铬源负载于载体上的方法可以是己知的任何可以将铬负载于载体上的 方法, 例如可以提及常规己知的制备 Phillips催化剂的方法。 根据一个实施方 案, 在浸渍过程中, 可以实施搅拌, 优选连续搅拌。 一般地, 该搅拌持续 1~12 小时, 优选 4~8 小时。 根据一个实施方案, 氟负载量为催化剂总重量的 0.01~10wt% , 优选 0.5-2 wt %; 铬的负载量为催化剂总重量的 0.01~10wt%, 优 选 0.05~5wt%。 然后将得到的含有氟和铬的载体进行干燥, 该干燥通常在室温 到 20CTC的温度进行; 例如在 15°C到 20CTC进行, 优选 2CTC到 20CTC, 进一步 优选 100°C到 200°C。 根据一个实施方案, 该干燥在约 12CTC进行。 对该干燥 进行的时间没有特别限定, 但是该干燥通常持续 6~20小时, 优选 7~18小时, 进一步优选 8~15小时。 在干燥完毕之后, 将含有氟和铬的无机载体进行焙烧。 对焙烧进行的方式没有特别限定, 但是该焙烧优选在流化床内进行。 根据一个 实施方案, 该焙烧通常以两个阶段进行, 即低温阶段和高温阶段。 该低温阶段 通常在 100~300°C进行。 该高温阶段通常在 300°C~900°C进行。 不受任何理论 限制, 在所述低温阶段载体中吸附的物理水被除去, 而在所述高温阶段无机载 体上的部分羟基被除去。 根据一个实施方案, 所述低温阶段持续 1~10小时, 优选 2~9小时。根据另一个实施方案, 所述高温阶段持续 1~10小时, 优选 2~9 小时, 更优选 3~8小时。 根据一个实施方案, 所述低温阶段在惰性气体或者空 气气氛下进行, 优选惰性气体气体, 更优选在氮气气氛下进行,例如高纯氮气。 根据一个实施方案, 所述高温焙烧阶段在在惰性气体或者空气中进行, 优选干 燥高纯空气。 在所述焙烧结束后, 将得到的负载上氟和铬的催化剂母体从高温 阶段冷却。 根据一个实施方案, 在高温焙烧之后冷却到 300~400°C的温度时, 可以切换气氛, 例如从空气变为惰性气体, 例如氮气。 根据一个实施方案, 该 冷却为自然降温冷却。 将得到的负载有氟和铬的催化剂母体在惰性气体气氛下 保存待用。
上述步骤 ii ) 是将钒源进一步负载于步骤 i ) 中制备的负载有氟和铬的催 化剂母体上。 用于将钒源负载于催化剂母体的方法可以是己知的任何可以将钒 负载于载体上的方法。 根据本发明的一个实施方案, 将钒源负载于预先负载有 氟和铬的催化剂母体上的方法包括用钒源溶液浸渍该催化剂母体。 根据一个实 施方案, 钒负载量为催化剂总重量的 0.01~10wt%, 优选 0.05~5wt%。 根据一个 实施方案, 在浸渍过程中, 可以实施搅拌, 优选连续搅拌。 一般地, 该搅拌持 续 1~12小时, 优选 4~8小时, 浸渍温度为 10~80°C, 优选 20~70°C。 然后将得 到的样品进行干燥。该干燥通常在室温〜 20CTC的温度进行; 例如在 15~200°C进 行, 优选 20~200°C, 进一步优选 100~200°C。 根据一个实施方案, 该干燥在约 12CTC进行。 该干燥亦可在真空条件下进行。 对该干燥进行的时间没有特别限 定, 但是该干燥通常持续 6~20小时, 优选 7~18小时, 进一步优选 8~15小时。 在干燥完毕之后, 将所得样品进行焙烧。 对焙烧进行的方式没有特别限定, 但 是该焙烧优选在流化床内进行。 根据一个实施方案, 该焙烧通常以两个阶段进 行, 即低温阶段和高温阶段。 低温阶段通常在 100~300°C进行。 该高温阶段通 常在 300~900°C进行。 不受任何理论限制, 在所述低温阶段将载体中吸附的物 理水基本除去, 而在所述高温阶段将无机载体上的部分羟基除去。 根据一个实 施方案, 所述低温阶段持续 1~10小时, 优选 2~9个小时。 根据另一个实施方 案, 所述高温阶段持续 1~10小时, 优选 2~9小时, 更优选 3~8小时。 根据一 个实施方案, 所述低温阶段在惰性气体或者空气气氛下进行, 优选在惰性气体 气氛下进行, 所述惰性气体例如是以上所述的惰性气体。 根据一个实施方案, 所述高温阶段焙烧在空气或者氧气条件下进行, 优选在干燥空气条件下进行。 在所述焙烧结束后, 将得到的负载上金属氧化物的载体从高温阶段冷却。 根据 一个实施方案, 在冷却到 300~400°C的温度时, 可以变换气氛, 例如从空气变 为惰性气体, 例如氮气、氩气等。根据一个实施方案, 该冷却为自然降温冷却, 得到催化剂在惰性气体下保存备用。
作为一个实例, 制备本发明催化剂的具体操作包括- 将硅胶浸渍在含有氟化铵和三氧化铬的水溶液中, 氟负载量相对于催化剂 总重量符合本文的要求 (例如 0.01~10wt%, 以氟的重量计), 铬负载量符合本 文的要求 (例如为催化剂总重量的 0.1~2wt%, 以铬的重量计), 连续搅拌一定 时间 (例如 3~8小时) 后, 升温干燥; 然后在流化床内进行高温焙烧, 其中在 低温阶段 (例如 100°C~300°C ) 在氮气气氛中焙烧脱除载体中吸附的物理水, 在高温阶段(例如 300°C~900°C )在干燥空气中焙烧脱除载体表面的部分羟基, 在此高温阶段保持一定时间 (例如 3~8 个小时); 自然降温冷却, 在冷却到 300~400°C时切换为氮气保护, 在氮气保护下转移, 保存待用, 然后将得到的 催化剂母体浸渍在一定浓度的草酸氧钒的水溶液中, 钒负载量相对于催化剂总 重量符合本文的要求(例如 0.1~10wt%, 以钒的重量计); 在连续搅拌一定时间 (例如 4~8小时) 后, 升温干燥; 将所得产物在流化床内进行高温焙烧, 其中 在低温阶段(例如 100°C~300°C )在氮气气氛中焙烧脱除载体中吸附的物理水, 在高温阶段 (例如 300°C~900°C ) 干燥空气中焙烧脱除载体表面的部分羟基, 在此高温阶段保持一定时间 (例如 3~8 个小时); 自然降温冷却, 在冷却到 300~400°C时切换为氮气保护, 在氮气保护下转移, 得到催化剂保存待用。 本发明提供氟改性的负载型铬钒双活性中心催化剂的一种制备方法包含 如下步骤:
i ) 将无机载体浸渍含有氟、 钒和铬的溶液, 然后干燥;
ϋ ) 将步骤 i ) 所得的产物在高温 300~900°C下焙烧活化, 得到所述催化 剂保存备用。
根据一个优选的制备氟改性的负载型铬钒双活性中心催化剂的方法包含 如下步骤:
i ) 将含有氟、 钒和铬的盐溶液浸渍在无机载体上, 浸渍时间为 l~12h, 优选 4-8h, 浸渍温度为 10~80°C, 优选 20~70°C, 然后在 90~250°C之间干燥, 优选 100~150°C, 干燥时间 6~20h, 优选 8~15h, 干燥过程中也可以采用真空; ϋ )将上述样品在惰性气体或者氧气或者空气中进行高温焙烧活化, 焙烧 温度在 300~900°C, 优选 400~800°C, 时间为 l~10h, 优选 3~8h, 然后进行冷 却, 在冷却至 300~400°C时切换成惰性气体如氮气或氩气等, 自然冷却, 在氮 气保护下转移, 得到催化剂在氮气保护下保存备用。
上述步骤 i ) 是将氟、 钒和铬同时浸渍于无机载体 (例如上文所述的无机 载体) 上的方法。 所述氟源可以是上文所述的氟源, 所述钒源可以是上文所述 的钒源,所述铬源可以是上文所述的铬源。根据一个实施方案,在浸渍过程中, 可以实施搅拌, 优选连续搅拌。 一般地, 该搅拌持续 1~12小时, 优选 4~8小 时。 根据一个实施方案, 氟负载量为催化剂总重量的 0.01~10wt%, 优选 0. 5~2wt%; 钒负载量为催化剂总重量的 0.01~10wt%, 优选 0.05~5wt%; 铬负载 量为催化剂总重量的 0.01~10wt%, 优选 0.05~5wt%。然后将得到的样品进行干 燥。 该干燥通常在室温到 20CTC的温度进行; 例如在 15°C到 20CTC进行, 优选 2CTC到 200°C, 进一步优选 100°C到 200°C。 根据一个实施方案, 该干燥在约 12CTC进行。 对该干燥进行的时间没有特别限定, 但是该干燥通常持续 6~20小 时, 优选 7~18小时, 进一步优选 8~15小时。
上述步骤 ii ) 是将含有氟、 钒和铬的无机载体进行焙烧。 对焙烧进行的方 式没有特别限定, 但是该焙烧优选在流化床内进行。 根据一个实施方案, 该焙 烧通常以两个阶段进行, 即低温阶段和高温阶段。 该低温阶段通常在 100~300 °C进行。 该高温阶段通常在 300°C~900°C进行。 不受任何理论限制, 在所述低 温阶段载体中吸附的物理水被除去, 而在所述高温阶段无机载体上的部分羟基 被除去。 根据一个实施方案, 所述低温阶段持续 1~10小时, 优选 2~9小时。 根据另一个实施方案, 所述高温阶段持续 1~10小时, 优选 2~9小时, 更优选 3~8小时。根据一个实施方案, 所述低温阶段在惰性气体或者空气气氛下进行, 优选惰性气体气体, 更优选在氮气气氛下进行, 例如高纯氮气。 根据一个实施 方案, 所述高温焙烧阶段在在惰性气体或者空气中进行, 优选干燥高纯空气。 在所述焙烧结束后, 将得到的负载上金属氧化物的载体从高温阶段冷却。 根据 一个实施方案, 在高温焙烧之后冷却到 300~400°C的温度时, 可以切换气氛, 例如从空气变为惰性气体, 例如氮气。 根据一个实施方案, 该冷却为自然降温 冷却。 将得到的催化剂在惰性气体气氛下保存待用。
作为一个实例, 制备本发明催化剂的具体操作包括- 将硅胶浸渍在含有氟化铵、 草酸氧钒和三氧化铬的水溶液中, 氟负载量相 对于催化剂总重量符合本文的要求 (例如 0.05~10wt%, 以氟的重量计), 钒负 载量相对于催化剂总重量符合本文的要求 (例如 0.1~10wt%, 以钒的重量计), 铬负载量符合本文的要求 (例如 0.1~2wt%, 以铬的重量计), 连续搅拌一定时 间 (例如 3~8小时) 后, 升温干燥; 然后在流化床内进行高温焙烧, 其中低温 阶段 (例如 100°C~300°C ) 在氮气气氛中焙烧脱除载体中吸附的物理水, 高温 阶段 (例如 300°C~900°C ) 在干燥空气中焙烧脱除载体表面的部分羟基, 在此 高温阶段保持一定时间(例如 3~8个小时); 自然降温冷却, 在冷却到 300~400 °C时切换为氮气保护, 在氮气保护下转移, 得到催化剂保存待用。 本发明提供氟改性的负载型铬钒双活性中心催化剂的一种制备方法包含 如下步骤:
i )采用上述六种方法(包括先制备好氟改性的无机载体然后先载钒再载 铬、 铬钒同时负载、 先载铬再载钒以及氟和钒先同时负载再载铬、 氟和铬先同 时负载再载钒、 以及氟钒铬同时负载) 中任意一种方法制备出的氟改性的铬钒 双活性中心催化剂;
ϋ )在制备好的氟改性的负载型铬钒双活性中心催化剂中加入有机金属助 催化剂进行预还原活化处理, 然后进行干燥保存备用。
根据一个优选的制备氟改性的负载型铬钒双活性中心催化剂的方法, 包含 如下步骤:
i )采用上述六种方法中任一种制备出氟改性的负载型铬钒双活性中心催 化剂;
ϋ )在惰性气氛下将得到的催化剂加入有机金属助催化剂, 对催化剂进行 预还原活化处理, 然后在 60-12CTC之间干燥 2-8小时, 干燥过程中也可以采用 真空, 然后在惰性气体下保存待用。
一般地, 上述方法是对得到的氟改性的负载型铬钒双活性中心催化剂进行 预还原活化处理。 步骤 i ) 是用上述六种方法中的任一种方法制备出氟改性的 负载型铬钒双活性中心催化剂, 步骤 ϋ ) 是在惰性气氛下加入有机金属助催化 剂对该催化剂进行预还原活化处理, 上述有机金属助催化剂包括有机铝化合 物、 有机锂化合物、 有机硼化合物等本领域技术人员公知的用于烯烃聚合反应 的任何一种助催化剂或者是它们的组合。 根据一个实施方案, 用作助催化剂的 有机铝化合物可以包括三垸基铝 A1R3、 二垸基垸氧基铝 Al OR、 二垸基卤化 铝 A1 X、 铝氧垸、 乙基倍半铝氯化物等等, 其中 R是垸基, 例如具有 1一 12 个碳原子的垸基, 例如是甲基、 乙基、 正丙基、 异丙基、 正丁基、 异丁基、 正 戊基、 正己基、 正庚基、 正辛基、 正壬基、 正十二垸基等, X是卤素, 例如氟、 氯、 溴和碘, 优选氯。 所述铝氧垸可以包括甲基铝氧垸 (MAO)等所有垸基铝与 水的反应物。 所述作为助催化剂的有机铝化合物可以单独使用或两种或两种以 上组合使用。 作为具体例子, 所述铝化合物可以提及三乙基铝、 三异丁基铝、 二乙基乙氧基铝、 一氯二乙基铝和甲基铝氧垸等。 根据一个实施方案, 采用有 机铝助催化剂对氟改性的负载型铬钒双活性中心催化剂进行预还原活化处理 时, 铝 /铬摩尔比在 0~1000之间, 优选 0~100, 更优选 0~50, 还原活化处理温 度在室温〜 10CTC之间, 优选室温〜 6CTC之间, 还原活化处理时间 0.5~20小时, 优选 0.5~10小时, 还原活化处理采用搅拌方式, 优选连续搅拌, 处理完毕后再 在 60~120°C之间干燥 2~8小时, 干燥在惰性气体气氛下进行, 例如在氮气、氦 气、 氩气等气氛下进行, 优选在氮气气氛下进行, 该干燥过程也可在真空条件 下进行。 得到的经过预还原活化的氟改性的负载型铬钒双活性中心催化剂在惰 性气体气氛下保存待用。
作为一个实例, 制备本发明催化剂的具体操作包括- 将六氟硅酸铵溶于水中配成溶液, 其中氟负载量相对于催化剂总重量符合 本文的要求(例如 0.01~10wt%, 以 F的重量计), 在上述溶液中加入硅胶浸渍, 在室温下连续搅拌一定时间后 (例如 4~8h), 然后升温干燥 8~15h; 将干燥后 的产物在流化床内进行高温焙烧, 其中在低温阶段 (例如 100~300°C ) 在氮气 气氛中焙烧脱除载体中的物理水, 在高温阶段 (例如 300°C~900°C ) 在干燥空 气中焙烧脱除载体表面的部分羟基, 在此高温阶段保持一定时间 (例如 3~8个 小时); 自然降温冷却, 在冷却到 300~400°C时切换为氮气保护, 得到所述氟改 性的硅胶, 转移至广口瓶, 放在干燥器里保存备用。 将得到的氟改性的硅胶浸 渍在一定浓度的偏钒酸铵溶液中, 钒负载量相对于催化剂总重量符合本文的要 求 (例如 0.1~10wt%, 以钒的重量计); 在连续搅拌一定时间 (例如 4~8小时) 后, 升温干燥; 将含有偏钒酸铵的氟改性的硅胶在流化床内进行高温焙烧, 其 中在低温阶段 (例如 100°C~300°C ) 在氮气气氛中焙烧脱除载体中吸附的物理 水, 在高温阶段 (例如 300°C~900°C ) 在干燥空气中焙烧脱除载体表面的部分 羟基, 在此高温阶段保持一定时间 (例如 3~8个小时); 自然降温冷却, 在冷 却到 300~400°C时切换为氮气保护, 制得载钒的催化剂母体。 然后, 将无机铬 源负载在由上述方法制得的催化剂母体上, 铬负载量符合本文的要求 (例如为 催化剂总重量的 0.1~3wt%,以铬的重量计)连续搅拌一定时间(例如 3~8小时) 后, 升温干燥; 然后在流化床内进行高温焙烧, 其中在低温阶段 (例如 10CTC -300 °C ) 在氮气气氛中焙烧脱除载体中吸附的物理水, 在高温阶段 (例如 300 °C~900°C )在干燥空气中焙烧脱除无机载体表面的部分羟基, 在此高温阶段保 持一定时间(例如 3~8个小时); 自然降温冷却, 在冷却到 300~400°C时切换为 氮气保护, 在氮气保护下转移, 保存待用。 然后加入三乙基铝对催化剂进行预 还原活化处理, 铝 /铬摩尔比在 0~50 之间, 处理温度在室温〜 60°C, 连续搅拌 0.5~10小时,然后再在 60~120°C之间干燥 2~8小时, 该干燥在惰性气体气氛下 进行, 例如在氮气、 氦气、 氩气等气氛下进行, 优选在氮气气氛下进行, 该干 燥过程也可在真空条件下进行。 得到的经过预还原活化的氟改性的负载型铬钒 双活性中心催化剂在惰性气体气氛下保存待用。 本发明负载型金属氧化物双活性中心乙烯聚合催化剂(包括以上经过有机 金属助催化剂预还原活化的铬钒双活性中心催化剂) 可用于乙烯的均聚或乙烯 与 (X-烯烃的共聚。 聚合过程中根据需要可添加有机金属助催化剂、 氢气等。
因此, 根据本发明的另一个方面, 提供了采用本发明所述负载型金属氧化 物双活性中心乙烯聚合催化剂生产乙烯均聚物以及乙炼 /(X-烯烃共聚物的方法, 特别是生产具有宽分子量分布的烯烃聚合物的方法。
对于上述方法, 聚合所使用的烯烃一般包含乙烯作为聚合单体。 在一个实 施方案中, 所述聚合使用的烯烃还包含共聚单体。 所述共聚单体可以是具有 3-20个碳原子的 α-烯烃, 例如丙烯、 1-丁烯、 1-戊烯、 1-己炼、 1-庚烯、 1-辛烯、 1-壬烯、 1-癸烯、 1-十二碳烯、 4-甲基 -1-戊烯、 4-甲基 -1-己烯等; 这些可以单 独使用或可以两种或更多种组合使用。 所述共聚单体优选是 1-丁烯、 1-己烯、 1-辛烯和 1-癸烯。当共聚单体存在时,共聚单体的量一般为 0-30vol%,优选 0-10 vol% , 基于聚合时共聚单体的体积浓度。
聚合过程中根据需要可再添加有机金属助催化剂(例如上文所述的有机金 属助催化剂) 到聚合体系中, 根据一个实施方案, 所述有机金属助催化剂可以 使用有机铝化合物, 有机铝化合物可以提及三乙基铝、 三异丁基铝、 二乙基乙 氧基铝、 一氯二乙基铝和甲基铝氧垸等。 所述有机金属铝化合物的使用量通常 是按铝 /铬摩尔比计 0-1000, 优选 0-70, 更优选 0-50。
上述聚合反应可以包括分子量调节剂, 作为例子可以提及氢气。
本发明的上述聚合物制造方法在其聚合方法方面没有任何特别限制。 上述 采用本发明负载型金属氧化物双活性中心乙烯聚合催化剂生产乙烯均聚物或 乙烯与 oc-烯烃共聚物的方法可以包括气相聚合方法、 淤桨聚合方法、 悬浮聚合 方法、 本体聚合方法、 溶液聚合方法等等。 如本领域技术人员所理解的那样, 对采用本发明催化剂的生产烯烃聚合物的方法没有特别限制, 可以采用本领域 己知的气相聚合方法、 淤桨聚合方法、 悬浮聚合方法、 本体聚合方法、 溶液聚 合方法的常规实施方案和聚合条件等等实施。
在一个实施方案中, 使用淤桨聚合方法, 包括向反应釜内加入乙烯, 然后 加入溶剂和助催化剂 (有机铝化合物) 并任选地加入氢气和共聚单体, 最后加 入本发明的负载型金属氧化物双活性中心乙烯聚合催化剂开始聚合。
上述淤桨聚合所使用的溶剂一般为本领域所公知的用于烯烃聚合的任何 溶剂。所述溶剂可以是具有 3-20个碳原子的垸烃,例如丙垸、正丁垸、异丁垸、 正戊垸、 异戊垸、 新戊垸、 正己垸、 环己垸、 正庚垸、 正辛垸等; 这些溶剂可 以单独使用或可以两种或更多种组合使用。 所述溶剂优选异丁垸、 异戊垸、 正 己垸、 环己垸、 正庚垸等。
在一个实施方案中, 采用传统的淤桨聚合法实施聚合, 具体操作如下: 先 将聚合反应釜进行真空加热除杂, 然后置换为高纯氮气, 反复操作三次, 再用 少量乙烯单体置换一次, 并最后将反应釜内充满乙烯至微正压 (0.12MPa); 向 反应釜内加入脱水脱氧处理后的精制溶剂如正庚垸, 一定量的垸基铝作为助催 化剂, 在氢调和共聚实验中还需分别加入一定量的氢气和共聚单体, 待乙烯压 力调至 0.15MPa, 最后加入本发明的催化剂开始聚合反应; 反应过程中在线采 集单体乙烯的瞬时消耗量 (通过连接电脑的高精密的乙烯质量流量计) 并由电 脑记录, 在一定温度下 (例如 35°C-100°C ) 反应进行一定时间 (例如 1小时) 后,加入盐酸 /乙醇混合溶液终止反应;聚合物经洗搽,真空干燥后称重并分析。
本发明在传统的负载型 Phillips铬系催化剂上引入负载的钒活性组分, 所 发明的催化剂含有两种活性组分, 即负载的铬氧化物和钒氧化物。 本发明还提 供的经二氧化钛改性和氟改性的的负载型铬钒氧化物双活性中心催化剂。 本发 明的催化剂可在单一反应器中或者组合反应器中生产具有宽分子量分布的乙 烯均聚物和乙 /oc-烯烃共聚物,具有较高的乙烯均聚和乙烯与 0C-烯烃共聚反应 活性。 使用本发明的铬钒双活性中心催化剂, 通过改变助催化剂用量、 聚合温 度、分子量调节剂等因素, 可以方便和容易地调整乙烯均聚物和乙炼 /0C-烯烃共 聚物的分子量和分子量分布以及共聚单体含量及分布, 从而可以方便和容易地 得到具有所需性能的聚合物产品。 附图的简单说明
附图 1为载体或催化剂母体焙烧程序示意图。
附图 2为载体或催化剂母体焙烧程序示意图。
附图 3为三个实施例的加压乙烯均聚聚合物高温 GPC谱图 (对比实施例 10、 11和实施例 20)。
附图 4为三个实施例加压乙烯、 1-己烯共聚聚合物高温 GPC谱图(对比实 施例 12、 13和实施例 21 )。
附图 5为载体或催化剂母体焙烧程序示意图。
附图 6为三个实施例的常压乙烯均聚聚合物高温 GPC谱图 -对比实施例 16-1, b-实施例 37, c-实施例 38-1 )。
附图 Ί为三个实施例的常压乙烯均聚聚合物高温 GPC谱图 -对比实施例 16-1, b-实施例 39)。
附图 8为载体或催化剂母体焙烧程序示意图。 具体实施方式
下面结合具体实施例对本发明作进一步阐述, 但本发明并不限于以下实施 例。 所述方法如无特别说明均为常规方法。 所述材料如无特别说明均能从公开 商业途径而得。 实施例中采用的硅胶是可商购的 Davison 955或 948。
实施例中的各种聚合物性质根据以下方法测量- 高温凝胶色谱 (HT-GPC)
重均分子量和分子量分布用高温凝胶色谱测定: 本实验采用 PL-220型高 温凝胶渗透色谱仪 (Polymer Laboratories公司) 来测定聚乙烯分子量及其分子 量分布。 实验中以 1,2,4一三氯苯为溶剂, 在 16CTC下测定。 采用窄分布聚苯 乙烯作为标样的普适校正法处理数据。
差示扫描量热法 (DSC)
测试聚合物的熔点:本实验采用 TA Q200型差示扫描量热仪在氮气保护下 进行测试。样品先以 lCTC/πώι的速度从室温升温到 150°C, 并恒温 5min, 然后 自然降到室温。 然后以 10°C/min的速度升温扫描 (室温至 150°C ), 记录 DSC 曲线。 实施例 1:
将 10g硅胶 (孔体积为 1.5-1.7 cm3/g, 表面积为 250-300 m2/g)浸渍在草酸氧 钒水溶液中 (V负载量为 0.4Swt% ), 4CTC油浴下连续搅拌浸渍 5h, 然后升温 至 12CTC干燥 5h, 然后转移至 12CTC烘箱干燥 6h; 将浸渍有草酸氧钒的硅胶载 体置于石英流化床内进行焙烧活化, 高纯空气中 45CTC保温 4h, 硅胶最后在氮 气下自然降温冷却转移, 上述焙烧过程如图 1所示。 将得到的样品再次浸渍碱 式醋酸铬水溶液 (Cr负载量为 0.5wt%), 室温下连续搅拌浸渍 4h后, 12CTC干燥 4h, 然后转移至 12CTC烘箱干燥 6h; 将干燥的样品置于石英流化床内进行焙烧 活化, 空气中 60CTC下焙烧 4 h, 然后在氮气保护下自然降温冷却转移, 上述焙 烧程序如图 2所示, 得到催化剂保存待用。
实施例 2:
将 10g硅胶 (孔体积为 1.5-1.7 cm3/g, 表面积为 250-300 m2/g)浸渍在碱式醋 酸铬与偏钒酸铵的水溶液中 (Cr负载量为 0.5wt%, V负载量为 0.48wt%), 60V 油浴下搅拌浸渍 4h, 12CTC下干燥 4h, 然后转移至 12CTC烘箱干燥 6h; 将干燥 的样品置于石英流化床内进行焙烧活化, 空气中 50CTC下保温 5h, 然后在氮气 保护下自然降温冷却转移, 得到催化剂保存待用。
实施例
将 10g硅胶 (孔体积为 1.5-1.7 cm3/g, 表面积为 250-300 m2/g)浸渍在硫酸氧 钒水溶液中 (V负载量 0.16wt% ), 室温下连续搅拌浸渍 4h, 12CTC下干燥 4h 后转移至 12CTC烘箱干燥 6h;将干燥的催化剂置于石英流化床内进行焙烧活化, 空气中 50CTC下保温 4 h, 在氮气保护下自然冷却。将得到的样品再次浸渍碱式 醋酸铬溶液 (Cr负载量 0.5 wt % ), 室温搅拌浸渍 4h后, 12CTC干燥 4h, 然后 转移至烘箱干燥 6h; 将干燥的样品置于石英流化床内进行焙烧活化, 空气中 60CTC下, 保温 4h, 在氮气保护下自然冷却, 焙烧程序如图 2, 得到催化剂保 存待用。
实施例 4:
将 10g硅胶 (孔体积为 1.5-1.7 cm3/g, 表面积为 250-300 m2/g)浸渍在偏钒酸 铵水溶液中 (V负载量为 0.24wt% ), 6CTC下连续搅拌浸渍 4h, 然后升温至 120 °C干燥 4h, 转移至 12CTC烘箱干燥 6h; 将干燥的样品置于石英流化床内进行焙 烧活化, 在高空气氛 450 °C下, 保温 4h, 焙烧程序如图 1, 得到负载的氧化钒 催化剂。 将得到的样品再次浸渍碱式醋酸铬水溶液 (&负载量为 0.5wt¾ ), 室 温下连续搅拌浸渍 4h后, 升温至 12CTC干燥 4h, 然后转移至烘箱干燥 6h; 将 干燥的样品置于石英流化床内进行焙烧活化, 60CTC下保温 4h, 在氮气保护下 自然冷却, 得到催化剂保存待用。
实施例 :
将 10g硅胶 (孔体积为 1.5-1.7 cm3/g, 表面积为 250-300 m2/g)浸渍在双乙酰 丙酮氧化钒的无水乙醇溶液中 (V 负载量为 0.96wt% ), 室温下连续搅拌浸渍 4h后升温至 10CTC干燥 8h, 然后转移至 12CTC烘箱干燥 6h; 将干燥的催化剂置 于石英流化床内进行焙烧活化, 高纯空气中 60CTC下保温 4h, 在氮气保护下自 然冷却。 将得到的样品再次浸渍碱式醋酸铬水溶液 (&负载量为 0.5wt¾ )。 室 温下搅拌浸渍 4h后升温至 12CTC干燥 4h, 然后转移至 12CTC烘箱干燥 6h; 将 干燥的样品置于石英流化床内进行焙烧活化, 高纯空气 60CTC下, 保温 4h, 焙 烧程序如图 2, 在氮气保护下自然冷却, 得到催化剂保存待用。
实施例 6:
将 10g硅胶 (孔体积为 1.5-1.7 cm3/g, 表面积为 250-300 m2/g)浸渍在碱式醋 酸铬水溶液中 (Cr负载量为 0.5wt%), 连续搅拌浸渍 4h, 升温至 12CTC干燥 4h, 然后转移至 12CTC烘箱干燥 6h;将干燥的样品置于石英流化床内进行焙烧活化, 在高纯空气中 60CTC保温 4h, 焙烧程序如图 2, 在氮气保护下自然冷却。 将得 到的样品再次浸渍在偏钒酸钠的水溶液中 (V负载量为 0.24wt%)。 4CTC下搅拌 浸渍 4h, 升温至 12CTC干燥 4h, 然后转移至 12CTC烘箱干燥 6h; 将干燥的样品 置于石英流化床内进行焙烧活化, 在高纯空气中 60CTC保温 4h, 然后在氮气保 护下自然冷却降温, 得到催化剂保存待用。
实施例 :
将 10g硅胶 (孔体积为 1.5-1.7 cm3/g, 表面积为 250-300 m2/g)浸渍在偏钒酸 铵水溶液中 (V负载量为 0.24wt% ), 6CTC下连续搅拌浸渍 4h, 然后升温至 120 °C干燥 4h, 转移至烘箱干燥 6h; 将干燥的样品置于石英流化床内进行焙烧活 化, 在高空气氛 60CTC下, 保温 4h, 得到负载的钒催化剂。 将得到的样品再次 浸渍碱式醋酸铬水溶液 (&负载量为 0.5wt% ), 室温下连续搅拌浸渍 4h后, 升温至 12CTC干燥 4h, 然后转移至烘箱干燥 6h; 将干燥的样品置于石英流化床 内进行焙烧活化, 60CTC下, 保温 4h, 焙烧程序如图 2 , 在氮气保护下自然冷 却。 然后加入浓度为 lmol/L的有机金属助催化剂——甲基铝氧垸 (Al/Cr摩尔 比 =30), 然后再在 10CTC干燥 4小时以去除溶剂, 该干燥在氮气气氛下进行。 经过预还原活化的催化剂在氮气气氛下保存待用。
实施例 8-·
称取实施例 1中催化剂 160mg进行常压聚合实验。将聚合反应釜真空加热 除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂,加入用量为 Al/Cr=10的三 异丁基铝 (TIBA) 作助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 9CTC后, 加入催化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质 量流量计) 并由电脑记录。 lh 后加入盐酸 /乙醇混合溶液终止反应。 过滤后将 所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 9:
称取实施例 2中催化剂 160mg进行常压聚合实验。将聚合反应釜真空加热 除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制过的正庚垸溶剂,加入用量为 Al/Cr=10的 三异丁基铝(TIBA)作助催化剂,再加入 30mL脱水脱氧精制后的正庚垸溶剂, 调节乙烯压力至 0.15MPa。 待釜内温度恒定在 9CTC后, 加入催化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质 量流量计) 并由电脑记录。 lh后加入 50 mL盐酸 /乙醇混合溶液终止反应。 过 滤后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 10:
称取实施例 3中催化剂 160mg进行常压聚合实验。将聚合反应釜真空加热 除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40 mL精制正庚垸溶剂, 加入用量为 AVCr=5的一氯 二乙基铝 (DEAC ) 作为助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶 剂, 调节乙烯压力至 0.15MPa。 待釜内温度恒定在 9CTC后, 加入催化剂开始反 应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密的乙 烯质量流量计) 并由电脑记录。 lh后加入 50mL盐酸 /乙醇混合溶液终止反应。 过滤后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。 实施例 m
称取实施例 5中催化剂 160mg进行常压聚合实验。将聚合反应釜真空加热 除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制正庚垸溶剂,加入用量为 Al/Cr=20的甲基 铝氧垸 (MAO) 作为助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶剂, 调节乙烯压力至 0.15MPa。 待釜内温度恒定在 90 °C后, 加入催化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质 量流量计) 并由电脑记录。 lh后加入 50 mL盐酸 /乙醇混合溶液终止反应。 过 滤后将所得聚合物在真空干燥箱中 60 °C下干燥 4h后称重并分析。
实施例 12:
称取实施例 6中催化剂 160mg进行常压聚合实验。将聚合反应釜真空加热 除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12 MPa。 接着依次向反应釜内加入 40 mL精制正庚垸溶剂, 加入用量为 AVCr=5的三异 丁基铝 (TIBA) 作为助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶剂, 调节乙烯压力至 0.15 MPa。待釜内温度恒定在 90 °C后,加入催化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质 量流量计) 并由电脑记录。 lh后加入 50 mL盐酸 /乙醇混合溶液终止反应。 过 滤后将所得聚合物在真空干燥箱中 60 °C下干燥 4h后称重并分析。
实施例 13:
称取实施例 7中催化剂 160 mg进行常压聚合实验。 将聚合反应釜真空加 热除杂,并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12 MPa。 接着向反应釜内加入 70 mL精制正庚垸溶剂, 调节乙烯压力至 0.15 MPa。待釜 内温度恒定在 90 °C后, 加入催化剂开始反应。 反应过程中在线采集单体乙烯 的瞬时消耗量 (通过连接电脑的高精密的乙烯质量流量计) 并由电脑记录。 lh 后加入 50 mL盐酸 /乙醇混合溶液终止反应。过滤后将所得聚合物在真空干燥箱 中 60 °C下干燥 4h后称重并分析。
实施例 14:
称取实施例 4中催化剂 160 mg进行常压聚合实验。 将聚合反应釜真空加 热除杂,并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12 MPa。 接着向反应釜内加入 70 mL精制正庚垸溶剂, 调节乙烯压力至 0.15 MPa。待釜 内温度恒定在 90 °C后, 加入催化剂开始反应。 反应过程中在线采集单体乙烯 的瞬时消耗量 (通过连接电脑的高精密的乙烯质量流量计) 并由电脑记录。 lh 后加入 50 mL盐酸 /乙醇混合溶液终止反应。过滤后将所得聚合物在真空干燥箱 中 60 °C下干燥 4h后称重并分析。
实施例 15:
分别称取实施例 4中催化剂 160 mg进行常压聚合实验。 将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12 MPa。 接着依次向反应釜内加入 40 mL 精制正庚垸溶剂, 分别加入用量为 Al/Cr=5 , 10、 15、 20的三异丁基铝 (TIBA)助催化剂 (分别对应实施例 15-1、 15-2, 15-3、 15-4), 再加入 30mL脱水脱氧精制后的正庚垸溶剂。 调节乙烯压 力至 0.15 MPa。 待釜内温度恒定在 90 °C后, 加入催化剂开始反应。 反应过程 中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密的乙烯质量流量 计) 并由电脑记录。 lh后加入 50 mL盐酸 /乙醇混合溶液终止反应。 过滤后将 所得聚合物在真空干燥箱中 60 °C下干燥 4h后称重并分析。
实施例 16:
分别称取实施例 4 中催化剂 160 mg分别在不同温度下进行常压聚合实 验。 将聚合反应釜真空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充 微量精制乙烯至 0.12 MPa。 接着依次向反应釜内加入 40 mL精制正庚垸溶剂, 加入用量为 Al/Cr=5的三异丁基铝 (TIBA) 作为助催化剂, 再加入 30mL脱水 脱氧精制后的正庚垸溶剂,调节乙烯压力至 0.15 MPa。聚合温度分别稳定在 50 °(和 7CTC (分别对应实施例 16-1和 16-2) 时, 加入催化剂开始反应。 反应过 程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质量流量 计) 并由电脑记录。 lh后加入 50 mL盐酸 /乙醇混合溶液终止反应。 过滤后将 所得聚合物在真空干燥箱中 60 °C下干燥 4h后称重并分析。
实施例 :
称取实施例 4中催化剂 160 mg进行常压聚合实验。 将聚合反应釜真空加 热除杂,并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12 MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 加入用量为 Al/Cr=5的三 乙基铝 (TEA) 作为助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶剂, 调节乙烯压力至 0.15 MPa。待釜内温度恒定在 90 °C后,加入催化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质 量流量计) 并由电脑记录。 lh后加入 50 mL盐酸 /乙醇混合溶液终止反应。 过 滤后将所得聚合物在真空干燥箱中 60 °C下干燥 4h后称重并分析。
实施例 18:
分别称取实施例 4中催化剂 160 mg进行常压聚合实验。 将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12 MPa。 接着依次向反应釜内加入 40 mL精制正庚垸溶剂, 加入用量为 Al/Cr=5 的三异丁基铝(TIBA)助催化剂, 分别加入经脱水处理的 0.7、 2.1、 3.5mL 1- 己烯, 即 1-己烯与聚合所用溶剂的体积比分别为 1、 3、 5vol% , (分别对应实 施例 18-1、 18-2, 18-3 ), 再加入 30mL脱水脱氧精制后的正庚垸溶剂, 调节乙 烯压力至 0.15 MPa。 待釜内温度恒定在 90 °C后, 加入催化剂开始反应。 反应 过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质量流 量计) 并由电脑记录。 lh后加入 50 mL盐酸 /乙醇混合溶液终止反应。 过滤后 将所得聚合物在真空干燥箱中 60 °C下干燥 4h后称重并分析。
实施例 19:
称取实施例 4中催化剂 160 mg进行常压聚合实验。 将聚合反应釜真空加 热除杂,并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12 MPa。 接着向反应釜内加入 40 mL精制正庚垸溶剂, 加入用量为 Al/Cr=5的三异丁基 铝 (TIBA)助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶剂, 再向釜内 加入 10mLH2, 调节乙烯压力至 0.15 MPa。 待釜内温度恒定在 90 °C后, 加入 催化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑 的高精密的乙烯质量流量计) 并由电脑记录。 lh后加入 50 mL盐酸 /乙醇混合 溶液终止反应。过滤后将所得聚合物在真空干燥箱中 60 °C下干燥 4h后称重并 分析。
实施例 20:
称取实施例 4中催化剂 100 mg进行加压聚合实验。 将不锈钢釜用溶剂擦 拭干净, 将催化剂装入, 在加热的情况下用高纯 N2抽排 30min。 用乙烯气体 置换一次, 并调节釜压力至 0.12MPa, 釜内注入 200mL精制正庚垸溶剂, 加入 用量为 Al/Cr=20 的三异丁基铝 (TIBA) 助催化剂。 待釜内温度恒定在 90 V 后, 调节乙烯压力至 0.4MPa, 将催化剂瓶釜内破碎并开始反应。 反应过程中在 线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密的乙烯质量流量计) 并 由电脑记录。 lh后将聚合物和溶剂倒入 100 mL盐酸 /乙醇混合溶液终止反应。 过滤后将所得聚合物在真空干燥箱中 60 °C下干燥 4h后称重并分析。
实施例 21:
称取实施例 4中催化剂 100 mg进行加压聚合实验。 将不锈钢釜用溶剂擦 拭干净, 将催化剂装入, 在加热的情况下用高纯 N2抽排 30min。 用乙烯气体 置换一次, 并调节釜压力至 0.12MPa, 釜内注入 200mL精制正庚垸溶剂, 加入 用量为 Al/Cr=20的三异丁基铝 (TIBA) 助催化剂, 再加入精制过的 6mLl-己 烯。 待釜内温度恒定在 90 °C后, 调节乙烯压力至 0.4MPa, 将催化剂瓶釜内破 碎并开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的 高精密的乙烯质量流量计) 并由电脑记录。 lh后将聚合物和溶剂倒入 100 mL 盐酸 /乙醇混合溶液终止反应。过滤后将所得聚合物在真空干燥箱中 60 °C下干 燥 4h后称重并分析。
对比实施例 J:
将 10 g硅胶 (孔体积为 1.5-1.7 cm3/g,表面积为 250-300 m2/g)浸渍在碱式醋 酸铬水溶液中(铬负载量为 0.5 wt % ),室温下连续搅拌浸渍 4 h,升温至 120 V 下干燥 4 h, 然后转移至烘箱干燥 6 h; 将干燥的样品置于石英流化床内, 在高 纯空气下 600 °C焙烧 4 h, 焙烧程序如图 2所示, 然后在氮气保护下自然冷却 转移, 得到 Phillips铬系催化剂保存备用。
对比实施例 2:
将 10 g硅胶 (孔体积为 1.5-1.7 cm3/g,表面积为 250-300 m2/g)浸渍在偏钒酸 铵水溶液中(钒负载量为 0.24wt%), 6CTC下连续搅拌浸渍 4h后,升温至 120 V 下干燥 4h, 然后转移至烘箱干燥 6h; 将干燥的样品置于石英流化床内, 在高 纯空气中 600 °C焙烧 4 h, 然后在氮气保护下自然降温转移, 得到负载的钒催 化剂保存备用。
对比实施例
将 10g硅胶 (孔体积为 1.5-1.7 cm3/g, 表面积为 250-300 m2/g)浸渍在三氧化 铬水溶液中(铬负载量为 1 wt % ), 室温搅拌浸渍 4h后,升温至 12CTC干燥 6h, 然后转移至烘箱干燥 6h;将干燥的样品置于石英流化床内,高纯空气中 600 V 焙烧活化 4 h, 得到 Phillips催化剂。 将 10g硅胶载体浸渍在偏钒酸铵水溶液中 (钒负载量为 0.48wt%), 5CTC下搅拌浸渍 4h后,干燥然后转移至烘箱干燥 6h; 将干燥的样品置于石英流化床内在高纯空气中进行 600 °(焙烧活化 4 h, 在氮 气保护下自然冷却, 得到负载的钒催化剂。 将上述得到的 Phillips催化剂和负 载的钒催化剂在氮气保护下, 按照 Cr/V摩尔比 2:1机械混匀,得到混合催化剂 保存备用。
对比实施例
称取对比实施例 1中催化剂 160 mg进行常压聚合实验。 将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12 MPa。 接着依次向反应釜内加入 40 mL精制正庚垸溶剂, 加入用量为 Al/Cr=5 的三异丁基铝 (TIBA) 作为助催化剂, 再用 30 mL精制正庚垸溶液冲洗釜壁, 调节乙烯压力至 0.15 MPa。待釜内温度恒定在 90 °C后,加入催化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质 量流量计) 并由电脑记录。 lh后加入 50 mL盐酸 /乙醇混合溶液终止反应。 过 滤后将所得聚合物在真空干燥箱中 60 °C下干燥 4h后称重并分析。
对比实施例 5:
称取对比实施例 2中催化剂 160 mg进行常压聚合实验。 将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12MPa。接着依次向反应釜内加入 40 mL精制正庚垸溶剂,加入用量为 Al/V=5 的三异丁基铝 (TIBA) 作为助催化剂; 再用 30 mL精制正庚垸溶液冲洗釜壁, 调节乙烯压力至 0.15 MPa。待釜内温度恒定在 90 °C后,加入催化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质 量流量计) 并由电脑记录。 lh后加入 50 mL盐酸 /乙醇混合溶液终止反应。 过 滤后将所得聚合物在真空干燥箱中 60 °C下干燥 4h后称重并分析。
对比实施例 ίί:
称取对比实施例 3中催化剂 160 mg进行常压聚合实验。 将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40 mL 精制正庚垸溶剂; 加入用量为 Al/Cr=5的三异丁基铝 (TIBA) 作为助催化剂; 再用 30 mL精制正庚垸溶液冲 洗釜壁, 调节乙烯压力至 0.15 MPa。 待釜内温度恒定在 90 °C后, 加入催化剂 开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精 密的乙烯质量流量计) 并由电脑记录。 lh后加入 50 mL盐酸 /乙醇混合溶液终 止反应。过滤后将所得聚合物在真空干燥箱中 60 °C下干燥 4h后称重并分析。。 对比实施例 7:
称取对比实施例 1中催化剂 160 mg进行常压聚合实验。 将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12 MPa。 接着依次向反应釜内加入 40 mL精制正庚垸溶剂, 加入用量为 Al/Cr=5 的三异丁基铝 (TIBA) 助催化剂, 分别加入经脱水处理的 0.7、 2.1、 3.5mL 1- 己烯, 即 1-己烯与聚合所用溶剂的体积比分别为 1、 3、 5vol% , (分别对应对 比实施例 7-1、 7-2、 7-3 ), 并用 30 mL精制正庚垸溶液冲洗釜壁, 调节乙烯压 力至 0.15 MPa。 待釜内温度恒定在 90 °C后, 加入催化剂开始反应。 反应过程 中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密的乙烯质量流量 计) 并由电脑记录。 lh后加入 50 mL盐酸 /乙醇混合溶液终止反应。 过滤后将 所得聚合物在真空干燥箱中 60 °C下干燥 4h后称重并分析。
对比实施例 8-·
称取对比实施例 1中催化剂 160 mg进行常压聚合实验。 将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12 MPa。 接着依次向反应釜内加入 40 mL精制正庚垸溶剂, 加入用量为 Al/Cr=5 的三异丁基铝助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶剂, 再向釜 内加入 10 mLH2, 调节乙烯压力至 0.15 MPa。 待釜内温度恒定在 90 °C后, 加 入催化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电 脑的高精密的乙烯质量流量计) 并由电脑记录。 lh后加入 50 mL盐酸 /乙醇混 合溶液终止反应。过滤后将所得聚合物在真空干燥箱中 60 °C下干燥 4h后称重 并分析。
对比实施例 9:
称取对比实施例 1中催化剂 160 mg进行常压聚合实验。 将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12MPa„ 接着依次向反应釜内加入 40 mL精制正庚垸溶剂, 加入 Al/Cr=5的 三乙基铝 (TEA) 为助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶剂, 调节乙烯压力至 0.15 MPa。待釜内温度恒定在 90 °C后,加入催化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质 量流量计) 并由电脑记录。 lh后加入 50 mL盐酸 /乙醇混合溶液终止反应。 过 滤后将所得聚合物在真空干燥箱中 60 °C下干燥 4h后称重并分析。
对比实施例
称取对比实施例 1中催化剂 100 mg分别进行加压聚合实验。 将不锈钢釜 用溶剂擦拭干净, 将催化剂装入, 在加热的情况下用高纯 N2抽排 30min。 用 乙烯气体置换一次, 并调节釜压力至 0.12MPa, 釜内注入 200mL精制正庚垸溶 剂, 加入 AVCr=20的三异丁基铝。 待釜内温度恒定在 90 °C后, 调节乙烯压力 至 0.4MPa,将催化剂瓶釜内破碎并开始反应。反应过程中在线采集单体乙烯的 瞬时消耗量(通过连接电脑的高精密的乙烯质量流量计)并由电脑记录。 lh后 将聚合物和溶剂倒入 100 mL盐酸 /乙醇混合溶液终止反应。 过滤后将所得聚合 物在真空干燥箱中 60 °C下干燥 4h后称重并分析。
对比实施例
称取对比实施例 2中催化剂 100 mg分别进行加压聚合实验。 将不锈钢釜 用溶剂擦拭干净, 将催化剂装入, 在加热的情况下用高纯 N2抽排 30min。 用 乙烯气体置换一次, 并调节釜压力至 0.12MPa, 釜内注入 200mL精制正庚垸溶 剂, 加入 Al/V=40的三异丁基铝。 待釜内温度恒定在 90 °C后, 调节乙烯压力 至 0.4MPa,将催化剂瓶釜内破碎并开始反应。反应过程中在线采集单体乙烯的 瞬时消耗量(通过连接电脑的高精密的乙烯质量流量计)并由电脑记录。 lh后 将聚合物和溶剂倒入 100 mL盐酸 /乙醇混合溶液终止反应。 过滤后将所得聚合 物在真空干燥箱中 60 °C下干燥 4h后称重并分析。
对比实施例
称取对比实施例 1中催化剂 100 mg进行加压聚合实验。 将不锈钢釜用溶 剂擦拭干净, 将催化剂装入, 在加热的情况下用高纯 N2抽排 30min。 用乙烯 气体置换一次, 并调节釜压力至 0.12MPa, 釜内注入 200mL精制正庚垸溶剂, 加入 Al/Cr=20的三异丁基铝, 然后加入 6ml精制过的 1-己炼。 待釜内温度恒 定在 90 °C后, 调节乙烯压力至 0.4MPa, 将催化剂瓶釜内破碎并开始反应。 反 应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质量 流量计)并由电脑记录。 lh后将聚合物和溶剂倒入 100 mL盐酸 /乙醇混合溶液 终止反应。过滤后将所得聚合物在真空干燥箱中 60 °C下干燥 4h后称重并分析。 对比实施例 称取对比实施例 2中催化剂 100 mg进行加压聚合实验。 将不锈钢釜用溶 剂擦拭干净, 将催化剂装入, 在加热的情况下用高纯 N2抽排 30min。 用乙烯 气体置换一次, 并调节釜压力至 0.12MPa, 釜内注入 200mL精制正庚垸溶剂, 加入 Al/V=40的三异丁基铝, 然后加入 6ml精制过的 1-己烯。待釜内温度恒定 在 90 °C后, 调节乙烯压力至 0.4MPa, 将催化剂瓶釜内破碎并开始反应。 反应 过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质量流 量计)并由电脑记录。 lh后将聚合物和溶剂倒入 100 mL盐酸 /乙醇混合溶液终 止反应。 过滤后将所得聚合物在真空干燥箱中 60 °C下干燥 4h后称重并分析。 表 J各实施例的乙烯聚合活性
Figure imgf000075_0001
实施例 19
157.0
实施例 20
1690.0
实施例 21
907.9
对比实施例 4
101.9
对比实施例 5
36.1
对比实施例 6 80.1
对比实施例 7-1
111.3
对比实施例 7-2 104.0
对比实施例 7-3
72.8
对比实施例 8
110.2
对比实施例 9
79.0
对比实施例 10 670.8
对比实施例 11 274.1
对比实施例 12
536.6
对比实施例 13
225.3 注:
( 1 ) 助催化剂的影响 表 2助催化剂用量对铬钒复合催化剂催化乙烯均聚的影响
助催化 活性 (kg PE 瑢点 量分 实施例 Al/Cr rc) 重均分子量 分子 剂 /mol Crh) C xio5) 布 实施例 14 -- 0 96.7 132.07 3.09 28.6 实施例 15-1 TIBA 5 145.6 132.16 2.76 30.1 实施例 15-2 TIBA 10 111.3 132.96 3.15 29.8 实施例 15-3 TIBA 15 87.4 133.51 3.49 29.3 实施例 15-4 TIBA 20 82.2 133.60 3.52 29.5 聚合条件: 乙烯压力 =0.15MPa; 聚合时间 =lhr; 聚合温度 =90°C ; 正庚垸
=70mL; Cr=0.5%(wt), V=0.24%(wt); 助催化剂=1 8 , 实施例 14、 15。
以实施例 14和 15为代表, 考察了不同助催化剂用量下铬钒双活性中心催 化剂的乙烯均聚活性, 如表 1。
从表 2可知, 在以 TiBA为助催化剂的条件下, 随着助催化剂的铝铬比从 5到 20不断加大,铬钒双活性中心催化剂乙烯均聚的活性呈现一个下降的过程, 说明要达到聚合高活性, 助催化剂的用量是有一个合适的值或者范围, 催化剂 在 Al/Cr为 5时, 活性最高。
表 3· 不同助催化剂对铬钒双活性中心催化剂和 i¾iffl¾is催化剂催化乙烯均聚的影响
活性 ¾ PE 瑢点
助催 c) 重均分子 分子量分 实施例 Al/Cr /mol Cr h) 布
化剂 C x io5) 对比实施例 4 TIBA 5 101.9 132.11 2.52 28.2 对比实施例 9 TEA 5 79.0 131.07 1.73 19.9 实施例 15-1 TIBA 5 145.6 132.16 2.76 30.1 实施例 17 TEA 5 103.0 131.44 1.94 33.8 聚合条件: 乙烯压力 =0.15MPa; 聚合时间 =lhr; 聚合温度 =90°C ; 正庚垸 =70mL; Cr=0.5%(wt), 对比实施例 4、 9和实施例 15-1、 17。
表 3表示采用不同助催化剂对铬钒双活性中心催化剂和 Phillips催化剂催 化乙烯均聚活性的影响。 采用 TEA做助催化剂活性低于用 TiBA做助催化剂。 进一步通过对上述产品聚乙烯的分析可知, 在不同助催化剂作用下的产品聚乙 烯都有类似的熔点, 但是其分子量和分子量分布大不相同, 说明助催化剂对催 化剂活性中心的还原程度和还原后的分布有较大的影响。
(2) 聚合温度对聚合性能的影响
表 4 聚合温度对铬钒双活性中心催化剂催化乙烯均聚的影响
活性 ¾ 瑢点 rc) 重均分子量 分子量分布 实施例 Al/Cr PE /mol C x io5)
CC) Crh)
实施例 16-1 50 5 535.6 132.35 3.65 29.4 实施例 16-2 70 5 325.5 132.28 3.39 13.8 实施例 15-1 90 5 145.6 132.16 2.76 30.1 聚合条件: 乙烯压力 =0.15MPa ; 聚合时间 =lhr ; 正庚垸 =70mL ; Cr=0.5%(wt) , V=0.24%(wt); 助催化剂=118入, 实施例 16、 15-1。
表 4为不同聚合温度 (实施例 16实施例 15-1 ) 下的铬钒双活性中心催化 剂的乙烯聚合结果。催化剂在 5CTC时具有最高活性, 随着温度的升高催化剂聚 合活性有所降低, 在 9CTC时具有最低活性。 不同聚合温度下得到的聚乙烯产品 都有类似的熔点, 其分子量随着聚合温度的升高, 出现降低的趋势, 说明聚合 温度升高对聚合反应链转移更有利。 (3 ) 催化剂不同制备方式对乙烯均聚性能的比较
表 5不同制备方式所得催化剂的聚合性能
实施例 Al/Cr 活性 (kg PE /mol 瑢点 rc) 重均分子量 分子量分布
Cr h) C X 105)
实施例 8 5 139.4 131.85 2.16 25.8 实施例 9 5 88.4 131.04 1.97 25.4 聚合条件: 乙烯压力 =0.15MPa; 聚合时间 =lhr; 聚合温度: 90°C, 正庚垸 =70mL; Cr=0.5%(wt), V=0.48%(wt); 助催化剂=1 8 ; 实施例 8和实施例 9。
实施例 8和实施例 9是分别采用分步浸渍和共浸渍两种不同负载方式制备 的铬钒催化剂在相同条件下的聚合活性, 可见分步浸渍制备的复合催化剂的活 性较高。
(4) 1-己烯的用量对乙烯 /1-己烯共聚性能的影响 乙烯、 J-己烯共聚对铬钒双活性中心催化剂和 PM¾ ^催化剂共聚特性的影响 活性 (kg 瑢点 重均分子量 分子量
1-己烯
实施例 Al/Cr PE /mol CO C x io5) 分布
(mL)
Cr h)
对比实施例 4 0 5 101.9 132.11 2.52 28.2 对比实施例 7-1 0.7 5 111.3 131.73 2.11 20.1 对比实施例 7-2 2.1 5 104.0 131.30 2.13 25.9 对比实施例 7-3 3.5 5 72.8 131.34 2.08 23.8 实施例 15-1 0 5 145.6 132.16 2.76 30.1 实施例 18-1 0.7 5 127.9 131.54 3.74 38.6 实施例 18-2 2.1 5 124.8 131.41 3.45 50.4 实施例 18-3 3.5 5 122.7 131.06 3.24 50.1 聚合条件: 乙烯压力 =0.15MPa; 聚合时间 =lhr; 聚合温度: 90°C, 正庚垸 =70mL; Cr=0.5%(wt); 助催化剂=1¾入, 实施例 15-1、 18和对比实施例 4、 7。
表 6给出了铬钒双活性中心催化剂和 Phillips催化剂乙烯 /1-己烯聚合的结 果。 铬钒双活性中心催化剂的乙 己烯共聚活性呈现出降低的趋势, 结合之 前乙烯均聚的结果, 表明乙 己烯共聚活性均低于乙烯均聚的活性。 Phillips 催化剂的乙炼 /1-己烯共聚活性呈现出先略增加后降低的趋势。加入 1-己炼, 其 他铬钒双活性中心催化剂的聚合活性同样下降。
图 3和图 4分别为铬钒双活性中心催化剂、 Phillips催化剂以及负载钒氧化 物催化剂的乙烯均聚物和乙烯与 1-己烯共聚物产品的 GPC谱图比较。 (5 ) 氢气对聚合性能的影响
表 7. 氢气对乙烯均聚的影响
活性 ¾ 瑢点 c) 重均分子量 分子量分 实施例 H3(mL) Al/Cr PE /mol C X 105) 布
Cr h)
对比实施例 4 0 5 101.9 132.11 2.52 28.2 对比实施例 8 10 5 110.2 131.79 2.19 28.4 实施例 15-1 0 5 145.6 132.16 2.76 30.1 实施例 19 10 5 157.0 131.66 2.41 29.6 聚合条件: 乙烯压力 =0.15MPa; 聚合时间 =lhr; 聚合温度: 90°C, 正庚垸 =70mL; Cr=0.5%(wt); 助催化剂=1¾入; 对比实施例 4、 8和实施例 15-1、 19。
表 7可见, 不同催化剂的乙烯均聚活性比没有氢气存在的条件下都有所降 低且聚乙烯的分子量和熔点都有所降低, 说明氢气起到链转移剂的作用导致其 分子量和熔点的下降。
实施例 22
将 10 g的硅胶(孔体积为 1.5~1.7 cm3/g, 表面积为 250~300 m2/g)浸渍在 钛酸四正丁酯的正己垸溶液中, (钛负载量为 lwt% )。连续搅拌 4h后, 油浴 80 °C干燥 4h, 然后采用真空干燥 2h进一步除去硅胶载体孔道中的溶剂, 转移至 鼓风干燥箱中 8CTC干燥 8 h; 然后将干燥后的样品在流化床内进行焙烧活化, 高纯空气下 60CTC保温 4h, 硅胶最后在氮气下自然降温冷却, 上述焙烧程序如 图 5所示, 得到浸渍法制得的二氧化钛改性硅胶。 然后, 将上述方法制得的二 氧化钛改性的硅胶浸渍在偏钒酸铵的水溶液中 (钒负载量为 0.24 wt% ) , 45 °C 下连续搅拌 4小时直至反应完全。 然后 12CTC油浴下干燥 6 h后, 转移至 120 烘箱干燥 8 h; 将干燥的样品置于石英流化床内进行焙烧活化, 空气中 450 °C下保温 4 h, 在氮气保护下自然冷却, 焙烧程序如图 1所示。 然后, 将所得 样品再次浸渍在碱式醋酸铬的水溶液中 (铬负载量为 0.5 wt% ), 室温下连续搅 拌 4小时直至反应完全。 然后在 12CTC油浴下干燥 6小时, 转移至鼓风干燥箱 中 12CTC干燥 8 h, 然后将得到的样品在流化床内进行高温焙烧, 高纯空气中 60CTC保温 4 h, 然后在氮气下自然降温冷却, 上述焙烧过程如图 2所示。 最后 在氮气保护下将催化剂转移至手套箱中保存备用。
实施例 23
将 10 g的硅胶(孔体积为 1.5~1.7 cm3/g, 表面积为 250~300 m2/g)浸渍在 钛酸四正丁酯的正己垸溶液中(钛负载量为 3 wt% )。连续搅拌 4小时后, 油浴 8CTC干燥 4小时, 然后采用真空干燥 2h进一步除去硅胶载体孔道中的溶剂, 转移至鼓风干燥箱中 8CTC干燥 8 h; 然后将干燥后的样品在流化床内进行焙烧 活化, 高纯空气下 60CTC保温 4 h, 硅胶最后在氮气下自然降温冷却, 上述焙烧 程序如图 5所示, 得到浸渍法制得的二氧化钛改性硅胶。 然后, 将上述方法制 得的二氧化钛改性的硅胶浸渍在偏钒酸铵的水溶液中(钒负载量为 0.24 wt%), 45 °C下连续搅拌 4小时直至反应完全。 然后 12CTC油浴下干燥 6 h后, 转移至 12CTC烘箱干燥 8 h;将干燥的样品置于石英流化床内进行焙烧活化,空气中 450 °C下保温 4 h, 在氮气保护下自然冷却, 焙烧程序如图 1所示。 然后, 将所得 样品再次浸渍在碱式醋酸铬的水溶液中 (铬负载量为 0.5 wt% ), 室温下连续搅 拌 4小时直至反应完全。 然后在 12CTC油浴下干燥 6小时, 转移至鼓风干燥箱 中 12CTC干燥 8 h, 然后将得到的样品在流化床内进行高温焙烧, 高纯空气中 60CTC保温 4 h, 然后在氮气下自然降温冷却, 上述焙烧过程如图 2所示。 最后 在氮气保护下将催化剂转移至手套箱中保存备用。
实施例 24
将 10 g的硅胶(孔体积为 1.5~1.7 cm3/g, 表面积为 250~300 m2/g)浸渍在 钛酸四正丁酯的正己垸溶液中 (钛负载量为 5wt% )。 连续搅拌 4小时后, 油浴 8CTC干燥 4小时, 然后采用真空干燥 2h进一步除去硅胶载体孔道中的溶剂, 再在鼓风干燥箱中 8CTC干燥 8 h, 然后将干燥后的样品在流化床内进行焙烧活 化, 高纯空气下 60CTC保温 4 h, 硅胶最后在氮气下自然降温冷却, 上述焙烧程 序如图 5所示, 得到浸渍法制得的二氧化钛改性硅胶。 然后, 将上述方法制得 的二氧化钛改性的硅胶浸渍在偏钒酸铵的水溶液中 (钒负载量为 0.24 wt% ) , 45 °C下连续搅拌 4小时直至反应完全。 然后 12CTC油浴下干燥 6 h后, 转移至 12CTC烘箱干燥 8 h;将干燥的样品置于石英流化床内进行焙烧活化,空气中 450 °C下保温 4 h, 在氮气保护下自然冷却, 焙烧程序如图 1所示。 然后, 将所得 样品再次浸渍在碱式醋酸铬的水溶液中 (铬负载量为 0.5 wt% ), 室温下连续搅 拌 4小时直至反应完全。 然后在 12CTC油浴下干燥 6小时, 转移至鼓风干燥箱 中 12CTC干燥 8 h, 然后将得到的样品在流化床内进行高温焙烧, 高纯空气中 60CTC保温 4 h, 然后在氮气下自然降温冷却, 上述焙烧过程如图 2所示。 最后 在氮气保护下将催化剂转移至手套箱中保存备用。 实施例 25
将 10 g的硅胶(孔体积为 1.5~1.7 cm3/g, 表面积为 250~300 m2/g)浸渍在 钛酸四正丁酯的正己垸溶液中(钛负载量为 3 wt% )。连续搅拌 4小时后, 油浴 8CTC干燥 4小时, 然后采用真空干燥 2h进一步除去硅胶载体孔道中的溶剂, 再在鼓风干燥箱中 8CTC干燥 8 h, 然后将干燥后的样品在流化床内进行焙烧活 化, 高纯空气下 60CTC保温 4h, 硅胶最后在氮气下自然降温冷却, 上述焙烧程 序如图 5所示, 得到浸渍法制得的二氧化钛改性硅胶。 然后, 将上述方法制得 的二氧化钛改性的硅胶浸渍在偏钒酸铵的水溶液中 (钒负载量为 0.48 wt% ) , 45°C下连续搅拌 4小时直至反应完全。 然后 12CTC油浴下干燥 6 h后, 转移至 12CTC烘箱干燥 8 h;将干燥的样品置于石英流化床内进行焙烧活化,空气中 450 °C下保温 4 h, 在氮气保护下自然冷却, 焙烧程序如图 1所示。 然后, 将所得 样品再次浸渍在碱式醋酸铬的水溶液中 (铬负载量为 0.5 wt% ), 室温下连续搅 拌 4小时直至反应完全。 然后在 12CTC油浴下干燥 6小时, 转移至鼓风干燥箱 中 12CTC干燥 8 h, 然后将得到的样品在流化床内进行高温焙烧, 高纯空气中 60CTC保温 4h, 然后在氮气下自然降温冷却, 上述焙烧过程如图 2所示。 最后 在氮气保护下将催化剂转移至手套箱中保存备用。
实施例 26
将 10 g的硅胶 (孔体积为 1.5~1.7 cm3/g, 表面积为 250-300 m2/g) 浸渍在 钛酸四正丁酯的正己垸溶液中(钛负载量为 5 wt% )。连续搅拌 4小时后, 油浴 8CTC干燥 4小时, 然后采用真空干燥 2h进一步除去硅胶载体孔道中的溶剂, 再在鼓风干燥箱中 8CTC干燥 8 h, 然后将干燥后的样品在流化床内进行焙烧活 化, 高纯空气下 60CTC保温 4h, 硅胶最后在氮气下自然降温冷却, 上述焙烧程 序如图 5所示, 得到浸渍法制得的二氧化钛改性硅胶。 然后, 将上述方法制得 的二氧化钛改性的硅胶浸渍在碱式醋酸铬和偏钒酸铵的水溶液中 (铬负载量为 0.5 wt% , 钒负载量为 0.24 wt% ), 45°C下连续搅拌 4小时直至反应完全。 然后 在 12CTC油浴下干燥 6小时, 再在鼓风干燥箱中 12CTC干燥 8 h, 然后将得到的 样品在流化床内进行高温焙烧, 高纯空气中 60CTC保温 4h, 然后在氮气下自然 降温冷却, 上述焙烧过程如图 2所示。 最后在氮气保护下将催化剂转移至手套 箱中保存备用。
实施例 27 将 10 g的硅胶(孔体积为 1.5~1.7 cm3/g, 表面积为 250~300 m2/g)浸渍在 钛酸四正丁酯的正己垸溶液中(钛负载量为 3 wt% )。连续搅拌 4小时后, 油浴 8CTC干燥 4小时, 然后采用真空干燥 2h进一步除去硅胶载体孔道中的溶剂, 再在鼓风干燥箱中 8CTC干燥 8 h, 然后将干燥后的样品在流化床内进行焙烧活 化, 高纯空气下 60CTC保温 4h, 硅胶最后在氮气下自然降温冷却, 上述焙烧程 序如图 5所示, 得到浸渍法制得的二氧化钛改性硅胶。 然后, 将上述方法制得 的二氧化钛改性的硅胶浸渍在偏钒酸铵的水溶液中 (钒负载量为 0.96 wt% ) , 45 °C下连续搅拌 4小时直至反应完全。 然后 12CTC油浴下干燥 6 h后, 转移至 12CTC烘箱干燥 8 h;将干燥的样品置于石英流化床内进行焙烧活化,空气中 450 °C下保温 4 h, 在氮气保护下自然冷却, 焙烧程序如图 1所示。 然后, 将所得 样品再次浸渍在碱式醋酸铬的水溶液中 (铬负载量为 0.5 wt% ), 室温下连续搅 拌 4小时直至反应完全。 然后在 12CTC油浴下干燥 6小时, 转移至鼓风干燥箱 中 12CTC干燥 8 h, 然后将得到的样品在流化床内进行高温焙烧, 高纯空气中 60CTC保温 4h, 然后在氮气下自然降温冷却, 上述焙烧过程如图 2所示。 最后 在氮气保护下将催化剂转移至手套箱中保存备用。
实施例 28
称取相应质量的钛酸四正丁酯 (钛负载量为 5 wt%) , 与无水乙醇按体积比 1 :2配成溶液 A, 再将蒸馏水与无水乙醇按体积比 95 : 1配成溶液^ 加入浓硝 酸酸调节溶液 B的 pH为 2~3, 将溶液 A和溶液 B混合, 制得二氧化钛溶胶。 将 10 g的硅胶(孔体积为 1.5~1.7 cm3/g, 表面积为 250~300 m2/g)加入上述溶 胶中, 连续搅拌 4小时后, 油浴 8CTC干燥 4小时, 然后采用真空干燥 2h进一 步除去硅胶载体孔道中的溶剂, 再在鼓风干燥箱中 8CTC干燥 8 h, 然后将干燥 后的样品在流化床内进行焙烧活化, 高纯空气下 60CTC保温 4h, 硅胶最后在氮 气下自然降温冷却, 上述焙烧程序如图 5所示, 得到溶胶凝胶法制得的二氧化 钛改性硅胶。 然后, 将上述方法制得的二氧化钛改性的硅胶浸渍在草酸氧钒的 水溶液中(钒负载量为 0.24 wt% ),室温下连续搅拌 4h直至反应完全。然后 120 °C油浴下干燥 6 h后, 转移至 12CTC烘箱干燥 8 h; 将干燥的样品置于石英流化 床内进行焙烧活化, 空气中 45CTC下保温 4 h, 在氮气保护下自然冷却, 焙烧程 序如图 1所示。 然后, 将所得样品再次浸渍在三氧化铬的水溶液中 (铬负载量 为 0.5 wt% ), 室温下连续搅拌 4小时直至反应完全。 然后在 12CTC油浴下干燥 6小时, 转移至鼓风干燥箱中 12CTC干燥 8 h, 然后将得到的样品在流化床内进 行高温焙烧, 高纯空气中 60CTC保温 4h, 然后在氮气下自然降温冷却, 上述焙 烧过程如图 2所示。 最后在氮气保护下将催化剂转移至手套箱中保存备用。 实施例 29
将 10 g的硅胶(孔体积为 1.5~1.7 cm3/g, 表面积为 250~300 m2/g)浸渍在 钛酸四正丁酯的正己垸溶液中(钛负载量为 3 wt% )。连续搅拌 4小时后, 油浴 8CTC干燥 4小时, 然后采用真空干燥 2h进一步除去硅胶载体孔道中的溶剂, 再在鼓风干燥箱中 8CTC干燥 8 h, 然后将干燥后的样品在流化床内进行焙烧活 化, 高纯空气下 50CTC保温 4h, 硅胶最后在氮气下自然降温冷却, 得到浸渍法 制得的二氧化钛改性硅胶。 然后, 将上述方法制得的二氧化钛改性的硅胶浸渍 在偏钒酸铵的水溶液中 (钒负载量为 0. 16 wt%), 45 °C下连续搅拌 4h直至反应 完全。 然后 12CTC油浴下干燥 6 h后, 转移至 12CTC烘箱干燥 8 h; 将干燥的样 品置于石英流化床内进行焙烧活化, 空气中 45CTC下保温 4 h, 在氮气保护下自 然冷却, 焙烧程序如图 1所示。 然后, 将所得样品再次浸渍在碱式醋酸铬的水 溶液中(铬负载量为 0.5 wt% ), 室温下连续搅拌 4h直至反应完全。然后在 120 °C油浴下干燥 6h, 转移至鼓风干燥箱中 12CTC干燥 8 h, 然后将得到的样品在 流化床内进行高温焙烧, 高纯空气中 60CTC保温 4h, 然后在氮气下自然降温冷 却, 上述焙烧过程如图 2所示。 最后在氮气保护下将催化剂转移至手套箱中保 存备用。
实施例 30
将钛酸四乙酯和硅酸钠混匀(钛负载量 5wt% ), 室温下搅拌反应 4h, 然后 油浴 12CTC干燥 4h, 然后放入真空干燥箱中 12CTC干燥 4h, 然后转移至 12CTC 鼓风干燥箱中干燥 8 h, 然后将干燥后的产物在流化床内进行高温焙烧, 高纯 空气下 60CTC保温 4h, 硅胶最后在氮气下自然降温冷却, 上述焙烧程序如图 5 所示, 得到二氧化钛改性硅胶。 然后, 将上述方法制得的二氧化钛改性的硅胶 浸渍在硫酸氧钒的水溶液中 (钒负载量为 0.24 wt% ) , 室温下连续搅拌 4小时 直至反应完全。 然后 12CTC油浴下干燥 6 h后, 转移至 12CTC烘箱干燥 8 h; 将 干燥的样品置于石英流化床内进行焙烧活化, 空气中 50CTC下保温 4 h, 在氮气 保护下自然冷却。 然后, 将所得样品再次浸渍在三氧化铬的水溶液中 (铬负载 量为 0.5 wt% ) , 室温下连续搅拌 4小时直至反应完全。 然后在 12CTC油浴下干 燥 6小时, 转移至鼓风干燥箱中 12CTC干燥 8 h, 然后将得到的样品在流化床内 进行高温焙烧, 高纯空气中 50CTC保温 4h, 然后在氮气下自然降温冷却。 最后 在氮气保护下将催化剂转移至手套箱中保存备用。
实施例 31
将钛酸异丙酯溶于正己垸溶剂, 然后加入浓硝酸调节 pH值为 2~3之间, 在 5CTC下回流 5h。 回流后的产物转移至配置瓶, 加入 10 g的硅胶 (孔体积为 1.5-1.7 cm3/g, 表面积为 250~300 m2/g) 室温下搅拌 4 h直至反应完全。 然后 油浴升温至 95 °C, 直至沉淀出现, 再将所得沉淀物放入 8CTC鼓风干燥箱中干 燥 8h。 然后将干燥后的产物在流化床内进行高温焙烧, 高纯空气下 60CTC保温 4h, 硅胶最后在氮气下自然降温冷却, 上述焙烧程序如图 5所示, 得到二氧化 钛改性硅胶。 然后, 将上述方法制得的二氧化钛改性的硅胶浸渍在乙酰丙酮钒 的无水乙醇溶液中 (钒负载量为 0.24 wt% ), 室温下连续搅拌 4小时直至反应 完全。 然后 locrc油浴干燥 6 h后, 转移至 locrc鼓风干燥箱中干燥 8 h; 将干 燥的样品置于石英流化床内进行焙烧活化, 空气中 45CTC下保温 4 h, 在氮气保 护下自然冷却, 焙烧程序如图 1所示。 然后, 将所得样品再次浸渍在铬酸铵的 水溶液中 (铬负载量为 0.5 w /o ) , 室温下连续搅拌 4h直至反应完全。 然后在 12CTC油浴下干燥 6h, 转移至鼓风干燥箱中 12CTC干燥 8 h, 然后将得到的样品 在流化床内进行高温焙烧, 高纯空气中 60CTC保温 4h, 然后在氮气下自然降温 冷却, 上述焙烧过程如图 2所示。 最后在氮气保护下将催化剂转移至手套箱中 保存备用。
实施例 32
将 10 g的硅胶(孔体积为 1.5~1.7 cm3/g, 表面积为 250~300 m2/g)浸渍在 钛酸四正丁酯的正己垸溶液中 (钛负载量为 5 wt% )。 连续搅拌 4h后, 油浴 80 °C干燥 4h, 然后采用真空干燥 2h进一步除去硅胶载体孔道中的溶剂, 再在鼓 风干燥箱中 8CTC干燥 8 h, 然后将干燥后的样品在流化床内进行焙烧活化, 高 纯空气下 50CTC保温 4h, 硅胶最后在氮气下自然降温冷却, 得到浸渍法制得的 二氧化钛改性硅胶。 然后, 将上述方法制得的二氧化钛改性的硅胶浸渍在碱式 醋酸铬的水溶液中 (铬负载量为 0.5 wt% ), 室温下连续搅拌 4h直至反应完全。 然后 12CTC油浴下干燥 6 h后, 转移至 12CTC烘箱干燥 8 h; 将干燥的样品置于 石英流化床内进行焙烧活化,空气中 60CTC下保温 4 h,在氮气保护下自然冷却, 焙烧程序如图 2所示。 然后, 将所得样品再次浸渍在偏钒酸铵的水溶液中 (钒 负载量为 0.24wt%), 6CTC下连续搅拌 4小时直至反应完全。然后在 12CTC油浴 下干燥 6小时, 转移至鼓风干燥箱中 12CTC干燥 8h, 然后将得到的样品在流化 床内进行高温焙烧, 高纯空气中 45CTC保温 4h, 然后在氮气下自然降温冷却, 上述焙烧过程如图 1所示。 最后在氮气保护下将催化剂转移至手套箱中保存备 用。
实施例 33
将 10 g的硅胶(孔体积为 1.5~1.7cm3/g, 表面积为 250~300 m2/g)浸渍在 硫酸钛和草酸氧钒的水溶液中, (钛负载量为 5wt%, 钒负载量为 0.24wt%), 连 续搅拌 4h, 12CTC油浴干燥 6h后, 转移至 12CTC烘箱干燥 8 h; 将干燥的样品 置于石英流化床内进行焙烧活化, 空气中 60CTC下保温 4h, 在氮气保护下自然 冷却。 然后将所得到的样品再次浸渍在碱式醋酸铬的水溶液中 (铬负载量为 0.5wt%); 在连续搅拌一定时间 5h后, 12CTC油浴干燥 6h, 转移至 12CTC烘箱 干燥 8h; 将干燥的样品置于石英流化床内进行焙烧活化, 空气中 60CTC下保温 4h, 在氮气保护下自然冷却, 上述焙烧过程如图 2所示。 最后在氮气保护下将 催化剂转移至手套箱中保存备用。
实施例 34
将 10 g的硅胶(孔体积为 1.5~1.7cm3/g, 表面积为 250~300 m2/g)浸渍在 硫酸钛和三氧化铬的水溶液中, (钛负载量为 5wt%, 铬负载量为 0.5wt%), 连 续搅拌 4h, 12CTC油浴干燥 6h后, 转移至 12CTC烘箱干燥 8 h; 将干燥的样品 置于石英流化床内进行焙烧活化, 空气中 60CTC下保温 4h, 在氮气保护下自然 冷却。 最后在氮气保护下转移保存待用。 然后将得到的样品再次浸渍在六氟钒 酸铵的水溶液中(钒负载量为 0.24wt%), 连续搅拌 4h, 12CTC油浴干燥 6h后, 转移至 12CTC烘箱干燥 8h; 将干燥的样品置于石英流化床内进行焙烧活化, 空 气中 50CTC下保温 4h, 在氮气保护下自然冷却, 最后在氮气保护下将催化剂转 移至手套箱中保存备用。
实施例 35
将 10 g的硅胶(孔体积为 1.5~1.7cm3/g, 表面积为 250~300 m2/g)浸渍在 硫酸钛、 草酸氧钒和三氧化铬的水溶液中, (钛负载量为 5wt%, 钒负载量为 0.24wt%, 铬负载量为 0.5wt¾) 连续搅拌 4h, 12CTC油浴干燥 6 h后, 转移至 12CTC烘箱干燥 8 h;将干燥的样品置于石英流化床内进行焙烧活化,空气中 600 °C下保温 4 h, 在氮气保护下自然冷却。 在氮气保护下自然冷却, 最后在氮气 保护下将催化剂转移至手套箱中保存备用。
实施例 36
将 10 g的硅胶(孔体积为 1.5~1.7 cm3/g, 表面积为 250~300 m2/g)浸渍在 钛酸四乙酯的正己垸溶液中(钛负载量为 3wt% )。连续搅拌 4小时后, 油浴 80 °C干燥 4小时, 然后采用真空干燥 2h进一步除去硅胶载体孔道中的溶剂, 再 在鼓风干燥箱中 8CTC干燥 8 h,然后将干燥后的样品在流化床内进行焙烧活化, 高纯空气下 60CTC保温 4h, 硅胶最后在氮气下自然降温冷却, 上述焙烧程序如 图 5所示, 得到浸渍法制得的二氧化钛改性硅胶。 然后, 将上述方法制得的二 氧化钛改性的硅胶浸渍在双乙酰丙酮氧钒的无水乙醇溶液中 (钒负载量为 0.24 wt% ) , 常温下连续搅拌 4小时直至反应完全。然后 9CTC油浴下干燥 6 h后, 转 移至 9CTC烘箱干燥 8 h; 将干燥的样品置于石英流化床内进行焙烧活化, 空气 中 50CTC下保温 4 h, 在氮气保护下自然冷却。 然后, 将所得样品再次浸渍在三 氧化铬铬的水溶液中 (铬负载量为 0.5 wt% ), 室温下连续搅拌 4小时直至反应 完全。 然后在 12CTC油浴下干燥 6小时, 转移至鼓风干燥箱中 12CTC干燥 8 h, 然后将得到的样品在流化床内进行高温焙烧, 高纯空气中 60CTC保温 4h, 然后 在氮气下自然降温冷却, 上述焙烧过程如图 2所示。 最后在氮气保护下将催化 剂转移至手套箱中保存备用。 然后加入 Al/Cr摩尔比 =20、 浓度为 lmol/L的有 机金属助催化剂——甲基铝氧垸, 然后再在 10CTC干燥 4小时以去除溶剂, 该 干燥在氮气气氛下进行。 得到经过预还原活化的催化剂在氮气气氛下保存待 用。
实施例 37
称取实施例 22中催化剂 160mg进行常压聚合实验。 将聚合反应釜真空加 热除杂, 并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 加入用量为 Al/Cr=5的三 异丁基铝 (TiBA) 作助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质 量流量计) 并由电脑记录。 lh 后加入盐酸 /乙醇混合溶液终止反应。 过滤后将 所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 38
分别称取实施例 23中催化剂 160mg进行常压聚合实验。 将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 分别加入用量 为 Al/Cr=5、 10、 15、 20、 30的三异丁基铝 (TiBA ) 作助催化剂 (分别对应实 施例 38-1、 38-2 , 38-3 , 38-4 , 38-5 ) , 再加入 30mL脱水脱氧精制后的正庚垸 溶剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始 反应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密的 乙烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过 滤后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 39
称取实施例 24中催化剂 160mg进行常压聚合实验。 将聚合反应釜真空加 热除杂,并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 加入用量为 Al/Cr=5的三 异丁基铝 (TiBA) 作助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质 量流量计) 并由电脑记录。 lh 后加入盐酸 /乙醇混合溶液终止反应。 过滤后将 所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 40
称取实施例 25中催化剂 160mg进行常压聚合实验。 将聚合反应釜真空加 热除杂, 并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 分别加入用量为 Al/Cr=5 的三异丁基铝 (TiBA)作助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶 剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始反 应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密的乙 烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤 后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 41 称取实施例 26中催化剂 160mg进行常压聚合实验。 将聚合反应釜真空加 热除杂, 并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 加入用量为 Al/Cr=5的三 异丁基铝 (TiBA) 作助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质 量流量计) 并由电脑记录。 lh 后加入盐酸 /乙醇混合溶液终止反应。 过滤后将 所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 42
称取实施例 27中催化剂 160mg进行常压聚合实验。 将聚合反应釜真空加 热除杂, 并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 分别加入用量为 Al/Cr=5 的三异丁基铝 (TiBA)作助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶 剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始反 应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密的乙 烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤 后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 43
称取实施例 28中催化剂 160mg进行常压聚合实验。 将聚合反应釜真空加 热除杂,并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 分别加入用量为 Al/Cr=5 的三异丁基铝 (TiBA)作助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶 剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始反 应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密的乙 烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤 后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 44
称取实施例 29中催化剂 160mg进行常压聚合实验。 将聚合反应釜真空加 热除杂, 并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 分别加入用量为 Al/Cr=5 的三异丁基铝 (TiBA)作助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶 剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始反 应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密的乙 烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤 后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 45
称取实施例 30中催化剂 160mg进行常压聚合实验。 将聚合反应釜真空加 热除杂,并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 分别加入用量为 Al/Cr=5 的三异丁基铝 (TiBA)作助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶 剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始反 应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密的乙 烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤 后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 46
称取实施例 31中催化剂 160mg进行常压聚合实验。 将聚合反应釜真空加 热除杂, 并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 分别加入用量为 Al/Cr=5 的三异丁基铝 (TiBA)作助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶 剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始反 应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密的乙 烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤 后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 47
称取实施例 32中催化剂 160mg进行常压聚合实验。 将聚合反应釜真空加 热除杂,并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 分别加入用量为 Al/Cr=5 的三异丁基铝 (TiBA)作助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶 剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始反 应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密的乙 烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤 后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 48
称取实施例 33中催化剂 160mg进行常压聚合实验。 将聚合反应釜真空加 热除杂, 并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 分别加入用量为 Al/Cr=5 的三异丁基铝 (TiBA)作助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶 剂。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密的乙 烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤 后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 49
称取实施例 34中催化剂 160mg进行常压聚合实验。 将聚合反应釜真空加 热除杂, 并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 分别加入用量为 Al/Cr=5 的三异丁基铝 (TiBA)作助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶 剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始反 应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密的乙 烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤 后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 50
称取实施例 35中催化剂 160mg进行常压聚合实验。 将聚合反应釜真空加 热除杂, 并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 分别加入用量为 Al/Cr=5 的三异丁基铝 (TiBA)作助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶 剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始反 应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密的乙 烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤 后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 51
称取实施例 36中催化剂 160mg进行常压聚合实验。 将聚合反应釜真空加 热除杂,并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着向反应釜内加入 70mL精制的正庚垸溶剂。 调节乙烯压力至 0. 15 MPa, 待 釜内温度恒定在 85 °C后, 加入催化剂开始反应。反应过程中在线采集单体乙烯 的瞬时消耗量 (通过连接电脑的高精密的乙烯质量流量计) 并由电脑记录。 lh 后加入盐酸 /乙醇混合溶液终止反应。 过滤后将所得聚合物在真空干燥箱中 60 °C下干燥 4h后称重并分析。
实施例 52
分别称取实施例 23中催化剂 160 mg进行常压聚合实验。将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12 MPa。 接着依次向反应釜内加入 40 mL精制正庚垸溶剂, 加入用量为 Al/Cr=5 的三异丁基铝(TIBA )助催化剂, 分别加入经脱水处理的 1.4 mL、 2.8 mL , 4.2 mL的 1-己炼, 即 1-己烯与聚合所用溶剂的体积比分别为 2、 4、 6vol% , (分别 对应实施例 52-1、 52-2 , 52-3 ) , 再加入 30mL脱水脱氧精制后的正庚垸溶剂, 调节乙烯压力至 0.15 MPa。 待釜内温度恒定在 85 °C后, 加入催化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质 量流量计) 并由电脑记录。 lh后加入 50 mL盐酸 /乙醇混合溶液终止反应。 过 滤后将所得聚合物在真空干燥箱中 60 °C下干燥 4h后称重并分析。
实施例 53
分别称取实施例 24中催化剂 160 mg进行常压聚合实验。将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12 MPa。 接着依次向反应釜内加入 40 mL精制正庚垸溶剂, 加入用量为 Al/Cr=5 的三异丁基铝(TIBA )助催化剂, 分别加入经脱水处理的 1.4 mL、 2.8 mL , 4.2 mL的 1-己炼, 即 1-己烯与聚合所用溶剂的体积比分别为 2、 4、 6vol% , (分别 对应实施 53-1、 53-2 , 53-3 ) , 再加入 30mL脱水脱氧精制后的正庚垸溶剂, 调 节乙烯压力至 0.15 MPa。待釜内温度恒定在 85 °C后, 加入催化剂开始反应。反 应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质量 流量计) 并由电脑记录。 lh后加入 50 mL盐酸 /乙醇混合溶液终止反应。 过滤 后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 54
分别称取实施例 22中催化剂 160 mg进行常压聚合实验。将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至
0.12MPa。 接着依次向反应釜内加入 40mL 精制的正庚垸溶剂, 加入用量为 Al/Cr=5的三异丁基铝 (TiBA) 作助催化剂, 再加入 30mL脱水脱氧精制后的 正庚垸溶剂,再分别向釜内加入 10mL、 20mLH2 (分别对应实施例 54-1、 54-2)。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85°C后, 加入催化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质 量流量计) 并由电脑记录。 lh 后加入盐酸 /乙醇混合溶液终止反应。 过滤后将 所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 55
分别称取实施例 23中催化剂 160 mg进行常压聚合实验。将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL 精制的正庚垸溶剂, 加入用量为 Al/Cr=5的三异丁基铝 (TiBA) 作助催化剂, 再加入 30mL脱水脱氧精制后的 正庚垸溶剂,再分别向釜内加入 10mL、 20mLH2 (分别对应实施例 55-1、 55-2)。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85°C后, 加入催化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质 量流量计) 并由电脑记录。 lh 后加入盐酸 /乙醇混合溶液终止反应。 过滤后将 所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 56
分别称取实施例 24中催化剂 160 mg进行常压聚合实验。将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL 精制的正庚垸溶剂, 加入用量为 Al/Cr=5的三异丁基铝 (TiBA) 作助催化剂, 再加入 30mL脱水脱氧精制后的 正庚垸溶剂,再分别向釜内加入 10mL、 20mLH2 (分别对应实施例 56-1、 56-2)。 调节乙烯压力至 0.15MPa, 待釜内温度恒定在 85°C后, 加入催化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质 量流量计) 并由电脑记录。 lh 后加入盐酸 /乙醇混合溶液终止反应。 过滤后将 所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 57
分别称取实施例 24中催化剂 160 mg进行常压聚合实验。将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12 MPa。 接着依次向反应釜内加入 40 mL精制正庚垸溶剂, 加入用量为 Al/Cr=5 的三异丁基铝(TIBA)作为助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸 溶剂, 调节乙烯压力至 0. 15 MPa。 聚合温度分别稳定在 55 °C和 7CTC (分别对 应实施例 57-1和 57-2 )时, 加入催化剂开始反应。 反应过程中在线采集单体乙 烯的瞬时消耗量 (通过连接电脑的高精密的乙烯质量流量计) 并由电脑记录。 lh后加入 50 mL盐酸 /乙醇混合溶液终止反应。 过滤后将所得聚合物在真空干 燥箱中 60 °C下干燥 4h后称重并分析。
实施例 58
称取实施例 24中催化剂 160 mg进行常压聚合实验。将聚合反应釜真空加 热除杂, 并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 加入用量为 Al/Cr=5的三 乙基铝 (TEA) 作助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶剂。 调 节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始反应。反 应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质量 流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤后将所 得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 59
称取实施例 23中催化剂 160 mg进行常压聚合实验。将聚合反应釜真空加 热除杂,并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着向反应釜内加入 70mL精制的正庚垸溶剂。 调节乙烯压力至 0. 15 MPa, 待 釜内温度恒定在 85 °C后, 加入催化剂开始反应。反应过程中在线采集单体乙烯 的瞬时消耗量 (通过连接电脑的高精密的乙烯质量流量计) 并由电脑记录。 lh 后加入盐酸 /乙醇混合溶液终止反应。 过滤后将所得聚合物在真空干燥箱中 60 °C下干燥 4h后称重并分析。
实施例 60
称取实施例 28中催化剂 160 mg进行常压聚合实验。将聚合反应釜真空加 热除杂, 并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 加入用量为 Al/Cr=5的三 乙基铝 (TEA) 作助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶剂。 调 节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85°C后, 加入催化剂开始反应。反 应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质量 流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤后将所 得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
对比实施例 W
将 10 g的硅胶(孔体积为 1.5~1.7 cm3/g, 表面积为 250~300 m2/g)浸渍在 偏钒酸铵的水溶液中 (钒负载量为 0.24 wt% ), 45 °C下连续搅拌 4h直至反应完 全。 然后 12CTC油浴下干燥 6 h后, 转移至 12CTC烘箱干燥 8 h; 将干燥的样品 置于石英流化床内进行焙烧活化, 空气中 45CTC下保温 4 h, 在氮气保护下自然 冷却, 焙烧程序如图 1所示。 然后, 将所得样品再次浸渍在碱式醋酸铬的水溶 液中 (铬负载量为 0.5 wt% ) , 室温下连续搅拌 4h直至反应完全。 然后在 120 °C油浴下干燥 6h, 转移至鼓风干燥箱中 12CTC干燥 8 h, 然后将得到的样品在 流化床内进行高温焙烧, 高纯空气中 60CTC保温 4h, 然后在氮气下自然降温冷 却, 上述焙烧过程如图 2所示。 最后在氮气保护下将得到的未改性的负载型铬 钒双活性中心催化剂转移至手套箱中保存备用。
对比实施例
将 20 g的硅胶(孔体积为 1.5~1.7 cm3/g, 表面积为 250~300 m2/g)浸渍在 钛酸异丙酯的正己垸溶液中(钛负载量为 3wt% )。连续搅拌 4小时后, 油浴 80 °C干燥 4h, 然后采用真空干燥 2h进一步除去硅胶载体孔道中的溶剂, 再在鼓 风干燥箱中 8CTC干燥 8 h, 然后将干燥后的样品在流化床内进行焙烧活化, 高 纯空气下 50CTC保温 4h, 硅胶最后在氮气下自然降温冷却, 得到二氧化钛改性 的硅胶。 然后, 将上述方法制得的 10g二氧化钛改性的硅胶浸渍在重铬酸铵水 溶液中 (铬负载量为 l wt % ), 室温搅拌浸渍 4h后, 升温至 12CTC干燥 6h, 然 后转移至烘箱干燥 6h; 将干燥的样品置于石英流化床内, 高纯空气中 60CTC焙 烧活化 4 h, 得到二氧化钛改性的 Phillips催化剂。 将上述方法制得的 10g二氧 化钛改性的硅胶浸渍在草酸氧钒水溶液中(钒负载量为 0.4Swt% ), 5CTC下搅拌 浸渍 4h后, 干燥然后转移至烘箱干燥 6h; 将干燥的样品置于石英流化床内在 高纯空气中进行 60CTC焙烧活化 4 h, 在氮气保护下自然冷却, 得到二氧化钛改 性的负载钒催化剂。 将上述得到的二氧化钛改性的 Phillips催化剂和二氧化钛 改性的负载钒催化剂在氮气保护下, 按照 Cr/V摩尔比 2:1机械混匀, 得到混合 催化剂保存备用。
对比实施例 Jii
分别称取对比实施例 14中催化剂 160 mg进行常压聚合实验。将聚合反应 釜真空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 分别加入用量 为 Al/Cr=5、 10、 15、 20、 30的三异丁基铝 (TiBA) 作助催化剂 (分别对应对 比实施例 16-1、 16-2, 16-3、 16-4、 16-5 ), 再加入 30mL脱水脱氧精制后的正 庚垸溶剂。调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85°C后, 加入催化剂 开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精 密的乙烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
对比实施例 J 7
称取对比实施例 14中催化剂 160 mg进行常压聚合实验。将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL 精制的正庚垸溶剂, 加入用量为 Al/Cr=5 的三乙基铝 (TEA) 作助催化剂, 再加入 30mL脱水脱氧精制后的正 庚垸溶剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85°C后, 加入催化剂 开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精 密的乙烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析
对比实施例
分别称取对比实施例 14中催化剂 160 mg进行常压聚合实验。将聚合反应 釜真空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12 MPa。 接着依次向反应釜内加入 40 mL 精制正庚垸溶剂, 加入用量为 Al/Cr=5的三异丁基铝(TIBA)助催化剂, 分别加入经脱水处理的 1.4 mL、 2.8 mL, 4.2 niL的 1-己炼,即 1-己烯与聚合所用溶剂的体积比分别为 2、4、6vol%, (分别对应对比实施例 18-1、 18-2, 18-3 ) , 再加入 30mL脱水脱氧精制后的正 庚垸溶剂, 调节乙烯压力至 0.15 MPa。待釜内温度恒定在 85°C后, 加入催化剂 开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精 密的乙烯质量流量计) 并由电脑记录。 lh后加入 50 mL盐酸 /乙醇混合溶液终 止反应。 过滤后将所得聚合物在真空干燥箱中 60 °C下干燥 4h后称重并分析。 对比实施例
分别称取对比实施例 14中催化剂 160 mg进行常压聚合实验。将聚合反应 釜真空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL 精制的正庚垸溶剂, 加入用量为 Al/Cr=5的三异丁基铝 (TiBA) 作助催化剂, 再加入 30mL脱水脱氧精制后的 正庚垸溶剂, 再分别向釜内加入 10mL、 20mLH2 (分别对应对比实施例 19-1、 19-2)。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开 始反应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密 的乙烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
对比实施例^?
分别称取对比实施例 14中催化剂 160 mg进行常压聚合实验。将聚合反应 釜真空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12 MPa。 接着依次向反应釜内加入 40 mL 精制正庚垸溶剂, 加入用量为 Al/Cr=5的三异丁基铝 (TIBA) 作为助催化剂, 再加入 30mL脱水脱氧精制后 的正庚垸溶剂, 调节乙烯压力至 0.15 MPa。 聚合温度分别稳定在 55°C和 7CTC (分别对应对比实施例 20-1和 20-2)时, 加入催化剂开始反应。 反应过程中在 线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密的乙烯质量流量计) 并 由电脑记录。 lh后加入 50 mL盐酸 /乙醇混合溶液终止反应。 过滤后将所得聚 合物在真空干燥箱中 60 °C下干燥 4h后称重并分析。
对比实施例^?
称取对比实施例 15中催化剂 160 mg进行常压聚合实验。将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL 精制的正庚垸溶剂, 加入用量为 Al/Cr=5的三异丁基铝 (TiBA) 作助催化剂, 再加入 30mL脱水脱氧精制后的 正庚垸溶剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85°C后, 加入催化 剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高 精密的乙烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反 应。 过滤后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。 表 8各实施例的乙烯聚合活性
Figure imgf000097_0001
实施例 54-1 195.83
实施例 54-2 190.65
实施例 55-1 226.59 实施例 55-2 187.13 实施例 56-1 228.74 实施例 56-2 143.23 实施例 57-1 543.23 实施例 57-2 413.74 实施例 58 185.10 实施例 58 80.82 实施例 60 156.18 对比实施例 16-1 207.97
对比实施例 16-2 176.94
对比实施例 16-3 141.21
对比实施例 164 117.44
对比实施例 16-5 135.16
对比实施例 17 188.88
对比实施例 18-1 189.73
对比实施例 18-2 172.88
对比实施例 18-3 102.62
对比实施例 19-1 207.45
对比实施例 19-2 220.52
对比实施例 20-1 585.73
对比实施例 20-2 442.83
对比实施例 21 163.58
注: 本发明凡是含锆的催化剂其聚合活性以单位摩尔锆计算, 下文同。 化剂浓度对聚合活性和产物性能的影响 表 9助催化剂用量对二氧化钛改性和未改性的负载型铬钒 金属氧化物双活性中心催化剂催化乙烯均聚的影响
活性 瑢点 重均分子量
实施例 Al/Cr PDI
(kg E molCr h) CO C xio5)
实施例 38-1 5 227.08 131.58 6.04 39.90 实施例 38-2 10 174.87 132.80 6.13 28.34 实施例 38-3 15 134.07 133.13 8.34 44.31 实施例 38-4 20 133.86 133.74 8.55 48.51 实施例 38-5 30 104.22 133.71 8.28 14.68 对比实施例 16-1 5 207.97 131.11 4.90 43.67 对比实施例 16-2 10 176.94 132.93 6.41 36.71 对比实施例 16-3 15 141.21 133.24 7.03 20.73 对比实施例 16-4 20 117.44 133.72 7.82 18.14 对比实施例 16-5 30 135.16 133.69 7.37 14.60 聚合条件: 乙烯压力 =0.15 MPa; 聚合时间 =l h; 聚合温度 =85°C ; 正庚垸 =70 mL; 助催化剂=118 ; Cr=0.5wt%。
从表 9可知, 在以三异丁基铝 (TiBA) 为助催化剂的条件下 (实施例 38 和对比实施例 16), 随着助催化剂用量的不断加大, 二氧化钛改性的负载型铬 钒双活性中心催化剂和未改性的负载型铬钒双活性中心催化剂乙烯均聚的活 性呈现下降的趋势, 而聚合物的分子量呈现出先升高后降低的趋势, 说明要得 到所需的聚合物分子量, 助催化剂的用量是有一个合适的值或者范围。 采用除 TiBA以外的其他助催化剂也存在类似的规律。
(2) 助催化剂种类对聚合活性和产物性能的影响
表 Jtf助催化剂种类对二氧化钛改性和未改性的负载型铬钒
金属氧化物双活性中心催化剂催化乙烯均聚的影响
助催化 活性 瑢点 重均分子量
实施例 PDI
剂 (kg E molCr h) O C xio5)
实施例 39 TiBA 232.33 131.58 4.62 46.04 实施例 58 TEA 185.10 132.02 3.14 10.61 对比实施例 16-1 TiBA 207.97 131.11 4.90 43.67 对比实施例 17 TEA 188.88 132.09 2.54 11.21 聚合条件: 乙烯压力 =0.15 MPa; 聚合时间 =l h; 聚合温度 =85°C ; 正庚垸 =70 mL; Al/Cr=5; Cr=0.5wt%。
表 10给出了采用不同助催化剂对二氧化钛改性和未改性的负载型铬钒金 属氧化物双活性中心催化剂催化乙烯均聚活性 (实施例 39、 58和对比实施例 16-1、 17)。 可见, 采用三异丁基铝 (TiBA) 作助催化剂时, 两种催化剂的活 性均明显高于采用三乙基铝 (TEA) 作助催化剂时的乙烯均聚活性。 进一步通 过对上述产品聚乙烯的分析可知, 在不同助催化剂作用下的产品聚乙烯都有类 似的熔点, 但是其分子量和分子量分布大不相同, 说明助催化剂对催化剂活性 中心的还原程度和还原后的分布有较大的影响。
(3 ) 聚合温度对聚合活性和产物性能的影响
表 温度对二氧化钛改性和未改性的负载型铬钒
金属氧化物双活性中心催化剂催化乙烯均聚的影响
温度 活性 瑢点 重均分子量
实施例
(kg E molCr h) CO Cxio5) PDI
( c)
实施例 57-1 55 543.23 131.66 7.28 27.19 实施例 57-2 70 413.74 131.68 4.73 41.38 实施例 39 85 232.33 131.58 4.62 46.04 对比实施例 20-1 55 585.73 131.79 6.00 36.69
对比实施例 20-2 70 442.83 130.77 5.14 25.24
对比实施例 16-1 85 207.97 131.11 4.90 43.67
聚合条件: 乙烯压力 =0.15MPa; 聚合时间 =lh; 正庚垸 =70mL; 助催化剂 =TiBA; Al/Cr=5 ; Cr=0.5wt%。
表 11 为不同聚合温度下的二氧化钛改性的和未改性的负载型铬钒双活性 中心催化剂的乙烯均聚活性 (实施例 39、 57和对比实施例 16-1、 20)。 在 55 °C-85°C的聚合温度范围内, 催化剂在 55°C时具有最高活性, 随着温度的升高 催化剂聚合活性降低, 在 85°C时具有最低活性。不同聚合温度下得到的聚乙烯 产品都有类似的熔点, 其分子量随着聚合温度的升高出现降低的趋势, 说明聚 合温度升高对聚合反应链转移更有利。
(4) 1-己烯用量对乙 己烯共聚性能的影响
J-己烯用量对乙^ -己烯共聚性能的影响
己烯 活性 瑢点 重均分子
C mL ) (kg E molCr h) CO 量 (χΐο5)
实施例 38-1
实施例 52-1
实施例 52-2
Figure imgf000100_0001
实施例 52-3 4.2 157.81 131.98 5.95 46.01
实施例 39 0 232.33 131.58 4.62 46.04 实施例 53-1 1.4 199.36 131.85 6.44 44.21 实施例 53-2 2.8 170.30 131.93 5.45 37.43 实施例 53-3 4.2 102.53 131.83 4.83 48.25 对比实施例 16-1 0 207.97 131.11 4.90 43.67 对比实施例 18-1 1.4 189.73 131.86 3.10 10.95 对比实施例 18-2 2.8 172.88 131.76 5.17 38.30 对比实施例 18-3 4.2 102.62 131.15 4.62 47.61 聚合条件: 乙烯压力 =0.15 MPa; 聚合时间 =l h; 聚合温度 =85°C ; 正庚垸 =70 mL; 助催化剂=118 ; Al/Cr=5; Cr=0.5wt%。
表 12给出了二氧化钛改性的负载型铬钒双活性中心催化剂催化乙炼 /1-己 烯聚合的活性 (实施例 38-1、 39、 52、 53和对比实施例 16-1、 18)。 随着 1-己 烯用量的增大, 二氧化钛改性的负载型铬钒双活性中心催化剂的乙烯 /1-己烯共 聚活性呈现出降低的趋势, 结合之前乙烯均聚的结果, 表明乙 己烯共聚活 性均低于乙烯均聚的活性。
(5 ) 催化剂制备方式对聚合性能的影响
表 13钛引入方式对二氧化钛改性的负载型铬钒氧化物
双活性中心催化剂聚合反应活性的影响
实施例 助催 活性 瑢点 重均分子量
PDI
化剂 (kg E molCr h) CO Cxio5)
实施例 39 TiBA 232.33 131.58 4.62 46.04 实施例 58 TEA 185.10 132.02 3.14 10.61 实施例 43 TiBA 233.68 131.86 4.28 43.19 实施例 60 TEA 156.18 132.31 2.93 1 .32
聚合条件: 乙烯压力 =0.15 MPa; 聚合时间 =l h; 聚合温度 =85°C ; 正庚垸 =70 mL; Al/Cr=5。
表 13 是对比了两种钛引入方式 (浸渍法和溶胶凝胶法) 制备的二氧化钛 改性的负载型铬钒双活性中心催化剂催化乙烯均聚的活性。 实施例 39、 58 中 的催化剂是以浸渍法制备的二氧化钛改性的硅胶作载体, 实施例 43、 60 中的 催化剂是以溶胶凝胶法制备的二氧化钛改性的硅胶作载体。 从表 13 可见, 当 以 TiBA作助催化剂时,两种钛引入方式制备的催化剂乙烯均聚活性相差不大; 但是, 当以 TEA作助催化剂时, 浸渍法制备的二氧化钛改性的的负载型铬钒 双活性中心催化剂的乙烯均聚活性要明显高于采用溶胶-凝胶法制备的催化剂 的均聚活性。
表 14铬钒负载方式对二氧化钛改性的负载型铬钒氧化物
双活性中心催化剂聚合反应活性的影响
实施例 活性 瑢点 重均分子量
PDI
(kg E molCr h) O C xio5)
实施例 39 232.33 131.58 4.62 46.04 实施例 41 198.80 131.12 4.37 43.86 聚合条件: 乙烯压力 =0.15 MPa; 聚合时间 =l h; 聚合温度 =85°C ; 正庚垸 =70 mL; 助催化剂=118 ; Al/Cr=5。
表 14是对比了两种铬钒负载方式 (铬钒分步浸渍在二氧化钛改性的载体 上和铬钒共浸渍在二氧化钛改性的载体上)制备的二氧化钛改性的负载型铬钒 双活性中心催化剂催化乙烯均聚的活性。 可见, 采用铬钒分步浸渍法制备的二 氧化钛改性的负载型铬钒双活性中心催化剂催化乙烯均聚的活性高于采用铬 钒共浸渍法制备的催化剂的均聚活性。
(6) 二氧化钛含量对催化剂聚合性能的影响
表 J5二氧化钛含量对二氧化钛改性的负载型铬钒氧化物
双活性中心催化剂聚合反应活性的影响
活性 瑢点 分子量
实施例 Al/Cr PDI
(kg E molCr h) CC) (χΐθ5)
对比实施例 16-1 5 207.97 131.11 4.90 43.67
实施例 37 5 203.86 131.86 6.81 44.15 实施例 38-1 5 227.08 132.80 6.04 39.90 实施例 39 5 232.33 131.58 4.62 46.04 聚合条件: 乙烯压力 =0.15 MPa; 聚合时间 =l h; 聚合温度 =85°C ; 正庚垸 =70 mL; 助催化剂=118入, Al/Cr=5。
表 15给出了不同二氧化钛含量的二氧化钛改性的负载型铬钒氧化物双活 性中心催化剂的聚合反应活性(实施例 37、 38-1 , 39和对比实施例 16-1 )。 实 施例 39的聚乙烯产品重均分子量比对比实施例 16-1的得到的聚乙烯产品分子 量低; 而实施例 37和实施例 38-1制备的聚乙烯产品的重均分子量比对比实施 例 16-1的聚乙烯产品分子量高。这说明, 二氧化钛引入到催化体系中会对催化 剂的活性中心产生影响。 另外, 聚合产物的 PDI都是在 40左右, 没有显著的 变化。
(7) 氢气用量对聚合性能的影响
表 16氢气用量对二氧化钛改性的负载型铬钒氧化物
双活性中心催化剂聚合反应活性的影响
氢气用量 活性 瑢点 重均分子量
实施例 PDI
(mL) (kg E molCr h) O (χΐθ5)
实施例 37 0 203.86 131.86 6.80 44.15
实施例 54-1 10 195.83 131.70 5.01 54.72
实施例 54-2 20 190.65 132.29 3.52 14.92
实施例 38-1 0 227.08 132.80 6.03 39.90
实施例 55-1 10 226.59 132.09 4.96 21.84
实施例 55-2 20 187.13 132.22 3.03 35.77
实施例 39 0 232.33 131.58 4.62 46.04
实施例 56-1 10 228.74 132.03 3.52 14.92
实施例 56-2 20 143.23 131.91 3.44 24.76
对比实施例 16-1 0 207.97 131.11 4.90 43.67
对比实施例 19-1 10 207.45 131.18 4.16 15.46
对比实施例 19-2 20 220.52 131.20 3.39 12.56
聚合条件: 乙烯压力 =0.15 MPa; 聚合时间 =l h; 聚合温度 =85°C ; 正庚垸 =70 mL; 助催化剂=118入, Al/Cr=5。
不同二氧化钛改性的负载型铬钒氧化物双活性中心催化剂的聚合反应时 氢调的影响如表 16所示(实施例 37、 38-1 , 39、 54、 55、 56和对比实施例 16-1、 19)。 可见, 氢调后的二氧化钛改性负载型铬钒双活性中心催化剂的乙烯均聚 活性均比没有氢气存在条件下有所降低, 且聚乙烯的分子量大副降低, 说明氢 气起到一个明显的链转移剂的作用导致聚乙烯的分子量下降。
实施例 61
将 10 g的硅胶(孔体积为 1.5~1.7 cm3/g, 表面积为 250~300 m2/g)浸渍在 六氟硅酸铵的水溶液中 (氟负载量为 1.5wt% )。 连续搅拌 4h后, 油浴 12CTC干 燥 6h, 转移至鼓风干燥箱中 80°C干燥 8 h; 然后将干燥后的样品在流化床内进 行焙烧活化, 高纯空气下 60CTC保温 4h, 硅胶最后在氮气下自然降温冷却, 上 述焙烧程序如图 8所示, 得到浸渍法制得的氟改性硅胶。 然后, 将上述方法制 得的氟改性的硅胶浸渍在偏钒酸铵的水溶液中 (钒负载量为 0.48 wt% ) , 45 °C 下连续搅拌 4小时直至反应完全。 然后 12CTC油浴下干燥 6 h后, 转移至 120 烘箱干燥 8 h; 将干燥的样品置于石英流化床内进行焙烧活化, 空气中 450 °C下保温 4 h, 在氮气保护下自然冷却, 焙烧程序如图 1所示。 然后, 将所得 样品再次浸渍在碱式醋酸铬的水溶液中(铬负载量为 l wt% ), 室温下连续搅拌 4小时直至反应完全。 然后在 12CTC油浴下干燥 6小时, 转移至鼓风干燥箱中 12CTC干燥 8 h, 然后将得到的样品在流化床内进行高温焙烧, 高纯空气中 600 °C保温 4 h, 然后在氮气下自然降温冷却, 上述焙烧过程如图 2所示。 最后在 氮气保护下将催化剂转移至手套箱中保存备用。
实施例 62
将 10 g的硅胶(孔体积为 1.5~1.7 cm3/g, 表面积为 250~300 m2/g)浸渍在 六氟硅酸铵的水溶液中(氟负载量为 0.75 wt% )。连续搅拌 4小时后, 油浴 120 °C干燥 6小时, 转移至鼓风干燥箱中 80°C干燥 8 h; 然后将干燥后的样品在流 化床内进行焙烧活化, 高纯空气下 60CTC保温 4 h, 硅胶最后在氮气下自然降温 冷却, 上述焙烧程序如图 8所示, 得到浸渍法制得的氟改性硅胶。 然后, 将上 述方法制得的氟改性的硅胶浸渍在偏钒酸铵的水溶液中 (钒负载量为 0.48 wt% ) , 45 °C下连续搅拌 4小时直至反应完全。 然后 12CTC油浴下干燥 6 h后, 转移至 12CTC烘箱干燥 8 h; 将干燥的样品置于石英流化床内进行焙烧活化, 空 气中 45CTC下保温 4 h, 在氮气保护下自然冷却, 焙烧程序如图 1所示。 然后, 将所得样品再次浸渍在碱式醋酸铬的水溶液中 (铬负载量为 lwt% ), 室温下连 续搅拌 4小时直至反应完全。 然后在 12CTC油浴下干燥 6小时, 转移至鼓风干 燥箱中 12CTC干燥 8 h, 然后将得到的样品在流化床内进行高温焙烧, 高纯空气 中 60CTC保温 4 h, 然后在氮气下自然降温冷却, 上述焙烧过程如图 2所示。 最 后在氮气保护下将催化剂转移至手套箱中保存备用。
实施例 63
将 10 g的硅胶 (孔体积为 1.5~1.7 cm3/g, 表面积为 250-300 m2/g) 浸渍在 六氟硅酸铵的水溶液中 (氟负载量为 1.5 wt% )。 连续搅拌 4小时后, 油浴 120 °C干燥 6小时, 再在鼓风干燥箱中 80°C干燥 8 h, 然后将干燥后的样品在流化 床内进行焙烧活化, 高纯空气下 60CTC保温 4h, 硅胶最后在氮气下自然降温冷 却, 上述焙烧程序如图 8所示, 得到浸渍法制得的氟改性硅胶。 然后, 将上述 方法制得的氟改性的硅胶浸渍在碱式醋酸铬和偏钒酸铵的水溶液中 (铬负载量 为 l wt%, 钒负载量为 0.48 wt% ), 45 °C下连续搅拌 4小时直至反应完全。然后 在 12CTC油浴下干燥 6小时, 再在鼓风干燥箱中 12CTC干燥 8 h, 然后将得到的 样品在流化床内进行高温焙烧, 高纯空气中 60CTC保温 4h, 然后在氮气下自然 降温冷却, 上述焙烧过程如图 2所示。 最后在氮气保护下将催化剂转移至手套 箱中保存备用。
实施例 64
将 10 g的硅胶 (孔体积为 1.5~1.7 cm3/g, 表面积为 250-300 m2/g) 浸渍在 六氟硅酸铵的水溶液中 (氟负载量为 1.5 wt% )。 连续搅拌 4小时后, 油浴 120 °C干燥 6小时, 再在鼓风干燥箱中 80°C干燥 8 h, 然后将干燥后的样品在流化 床内进行焙烧活化, 高纯空气下 60CTC保温 4h, 硅胶最后在氮气下自然降温冷 却, 上述焙烧程序如图 8所示, 得到浸渍法制得的氟改性硅胶。 然后, 将上述 方法制得的氟改性的硅胶浸渍在草酸氧钒的水溶液中(钒负载量为 0.48 wt%), 室温下连续搅拌 4h直至反应完全。 然后 12CTC油浴下干燥 6 h后, 转移至 120 烘箱干燥 8 h; 将干燥的样品置于石英流化床内进行焙烧活化, 空气中 450 °C下保温 4 h, 在氮气保护下自然冷却, 焙烧程序如图 1所示。 然后, 将所得 样品再次浸渍在三氧化铬的水溶液中 (铬负载量为 l wt% ), 室温下连续搅拌 4 小时直至反应完全。然后在 12CTC油浴下干燥 6小时,转移至鼓风干燥箱中 120 °C干燥 8 h, 然后将得到的样品在流化床内进行高温焙烧, 高纯空气中 60CTC保 温 4h, 然后在氮气下自然降温冷却, 上述焙烧过程如图 2所示。 最后在氮气保 护下将催化剂转移至手套箱中保存备用。
实施例 65
将 10 g的硅胶 (孔体积为 1.5~1.7 cm3/g, 表面积为 250-300 m2/g) 浸渍在 六氟硅酸铵的水溶液中 (氟负载量为 1.5 wt% )。 连续搅拌 4小时后, 油浴 120 °C干燥 6小时, 再在鼓风干燥箱中 80°C干燥 8 h, 然后将干燥后的样品在流化 床内进行焙烧活化, 高纯空气下 60CTC保温 4h, 硅胶最后在氮气下自然降温冷 却, 上述焙烧程序如图 8所示, 得到浸渍法制得的氟改性硅胶。 然后, 将上述 方法制得的氟改性的硅胶浸渍在碱式醋酸铬的水溶液中 (铬负载量为 l wt% ), 室温下连续搅拌 4h直至反应完全。 然后 12CTC油浴下干燥 6 h后, 转移至 120 烘箱干燥 8 h; 将干燥的样品置于石英流化床内进行焙烧活化, 空气中 600 °C下保温 4 h, 在氮气保护下自然冷却, 焙烧程序如图 2所示。 然后, 将所得 样品再次浸渍在偏钒酸铵的水溶液中 (钒负载量为 0.48 wt% ) , 6CTC下连续搅 拌 4小时直至反应完全。 然后在 12CTC油浴下干燥 6小时, 转移至鼓风干燥箱 中 12CTC干燥 8 h, 然后将得到的样品在流化床内进行高温焙烧, 高纯空气中 45CTC保温 4h, 然后在氮气下自然降温冷却, 上述焙烧过程如图 1所示。 最后 在氮气保护下将催化剂转移至手套箱中保存备用。
实施例 66
将 10 g的硅胶(孔体积为 1.5~1.7 cm3/g, 表面积为 250~300 m2/g)浸渍在 六氟硅酸铵和草酸氧钒的水溶液中, (氟负载量为 1.5wt%, 钒负载量为 0.48wt% ) , 连续搅拌 4h, 12CTC油浴干燥 6 h后, 转移至 12CTC烘箱干燥 8 h; 将干燥的样品置于石英流化床内进行焙烧活化, 空气中 60CTC下保温 4 h, 在氮 气保护下自然冷却。 然后将所得到的样品再次浸渍在碱式醋酸铬的水溶液中 (铬负载量为 lwt% ) ; 在连续搅拌一定时间 5 h后, 12CTC油浴干燥 6 h, 转移 至 12CTC烘箱干燥 8 h; 将干燥的样品置于石英流化床内进行焙烧活化, 空气中 60CTC下保温 4 h, 在氮气保护下自然冷却, 上述焙烧过程如图 2所示。 最后在 氮气保护下将催化剂转移至手套箱中保存备用。
实施例 67
将 10 g的硅胶(孔体积为 1.5~1.7 cm3/g, 表面积为 250~300 m2/g)浸渍在 氟化铵和三氧化铬的水溶液中, (氟负载量为 1.5wt%, 铬负载量为 lwt% ), 连 续搅拌 4h, 12CTC油浴干燥 6 h后, 转移至 12CTC烘箱干燥 8 h; 将干燥的样品 置于石英流化床内进行焙烧活化, 空气中 60CTC下保温 4 h, 在氮气保护下自然 冷却。 最后在氮气保护下转移保存待用。 然后将得到的样品再次浸渍在草酸氧 钒的水溶液中 (钒负载量为 0.48wt%), 连续搅拌 4h, 12CTC油浴干燥 6 h后, 转移至 12CTC烘箱干燥 8 h; 将干燥的样品置于石英流化床内进行焙烧活化, 空 气中 50CTC下保温 4 h, 在氮气保护下自然冷却, 最后在氮气保护下将催化剂转 移至手套箱中保存备用。
实施例 68
将 10 g的硅胶(孔体积为 1.5~1.7 cm3/g, 表面积为 250~300 m2/g)浸渍在 六氟硅酸铵、 偏钒酸铵和碱式醋酸铬的水溶液中, (氟负载量为 1.5wt%, 钒负 载量为 0.48wt%, 铬负载量为 lwt% ) 连续搅拌 4h, 12CTC油浴干燥 6 h后, 转 移至 12CTC烘箱干燥 8 h; 将干燥的样品置于石英流化床内进行焙烧活化, 空气 中 60CTC下保温 4 h, 在氮气保护下自然冷却。 在氮气保护下自然冷却, 最后在 氮气保护下将催化剂转移至手套箱中保存备用。
实施例 69
将 10 g的硅胶 (孔体积为 1.5~1.7 cm3/g, 表面积为 250-300 m2/g) 浸渍在 六氟硅酸铵的水溶液中 (氟负载量为 1.5 wt% )。 连续搅拌 4小时后, 油浴 120 °C干燥 6小时, 再在鼓风干燥箱中 80°C干燥 8 h, 然后将干燥后的样品在流化 床内进行焙烧活化, 高纯空气下 60CTC保温 4h, 硅胶最后在氮气下自然降温冷 却, 上述焙烧程序如图 8所示, 得到浸渍法制得的氟改性硅胶。 然后, 将上述 方法制得的氟改性的硅胶浸渍在双乙酰丙酮氧钒的无水乙醇溶液中 (钒负载量 为 0.48 wt% ), 常温下连续搅拌 4小时直至反应完全。然后 9CTC油浴下干燥 6 h 后, 转移至 9CTC烘箱干燥 8 h; 将干燥的样品置于石英流化床内进行焙烧活化, 空气中 50CTC下保温 4 h, 在氮气保护下自然冷却。 然后, 将所得样品再次浸渍 在三氧化铬的水溶液中(铬负载量为 l wt%), 室温下连续搅拌 4小时直至反应 完全。 然后在 12CTC油浴下干燥 6小时, 转移至鼓风干燥箱中 12CTC干燥 8 h, 然后将得到的样品在流化床内进行高温焙烧, 高纯空气中 60CTC保温 4h, 然后 在氮气下自然降温冷却, 上述焙烧过程如图 2所示。 最后在氮气保护下将催化 剂转移至手套箱中保存备用。 然后加入 Al/Cr摩尔比 =20、 浓度为 lmol/L的有 机金属助催化剂——甲基铝氧垸, 然后再在 10CTC干燥 4小时以去除溶剂, 该 干燥在氮气气氛下进行。 得到经过预还原活化的催化剂在氮气气氛下保存待 用。
实施例 70
称取实施例 61中催化剂 160mg进行常压聚合实验。 将聚合反应釜真空加 热除杂,并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂,分别加入用量为 Al/Cr=2.5 的三异丁基铝 (TiBA)作助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶 剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始反 应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密的乙 烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤 后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 71
称取实施例 62中催化剂 160mg进行常压聚合实验。 将聚合反应釜真空加 热除杂,并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 加入用量为 Al/Cr=2.5的 三异丁基铝(TiBA)作助催化剂,再加入 30mL脱水脱氧精制后的正庚垸溶剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质 量流量计) 并由电脑记录。 lh 后加入盐酸 /乙醇混合溶液终止反应。 过滤后将 所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 2
称取实施例 63中催化剂 160mg进行常压聚合实验。 将聚合反应釜真空加 热除杂, 并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 加入用量为 Al/Cr=2.5的 三异丁基铝(TiBA)作助催化剂,再加入 30mL脱水脱氧精制后的正庚垸溶剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质 量流量计) 并由电脑记录。 lh 后加入盐酸 /乙醇混合溶液终止反应。 过滤后将 所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 73
称取实施例 64中催化剂 160mg进行常压聚合实验。 将聚合反应釜真空加 热除杂, 并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂,分别加入用量为 Al/Cr=2.5 的三异丁基铝 (TiBA)作助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶 剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始反 应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密的乙 烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤 后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 74
称取实施例 65中催化剂 160mg进行常压聚合实验。 将聚合反应釜真空加 热除杂, 并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 加入用量为 Al/Cr=2.5的 三异丁基铝(TiBA)作助催化剂,再加入 30mL脱水脱氧精制后的正庚垸溶剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质 量流量计) 并由电脑记录。 lh 后加入盐酸 /乙醇混合溶液终止反应。 过滤后将 所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 75
称取实施例 66中催化剂 160mg进行常压聚合实验。 将聚合反应釜真空加 热除杂, 并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂,分别加入用量为 Al/Cr=2.5 的三异丁基铝 (TiBA)作助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶 剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始反 应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密的乙 烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤 后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 76
分别称取实施例 68中催化剂 160mg进行常压聚合实验。 将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 分别加入用量 为 Al/Cr=2.5、 5、 10、 15、 20的三异丁基铝 ( TiBA )作助催化剂 (分别对应实 施例 76-1、 76-2、 76-3、 76-4、 76-5 ), 再加入 30mL脱水脱氧精制后的正庚垸 溶剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始 反应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密的 乙烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过 滤后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 7
称取实施例 67中催化剂 160mg进行常压聚合实验。 将聚合反应釜真空加 热除杂,并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂,分别加入用量为 Al/Cr=2.5 的三异丁基铝 (TiBA)作助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶 剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始反 应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密的乙 烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤 后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 78
称取实施例 69中催化剂 160mg进行常压聚合实验。 将聚合反应釜真空加 热除杂, 并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着向反应釜内加入 70mL精制的正庚垸溶剂。 调节乙烯压力至 0. 15 MPa, 待 釜内温度恒定在 85 °C后, 加入催化剂开始反应。反应过程中在线采集单体乙烯 的瞬时消耗量 (通过连接电脑的高精密的乙烯质量流量计) 并由电脑记录。 lh 后加入盐酸 /乙醇混合溶液终止反应。 过滤后将所得聚合物在真空干燥箱中 60 °C下干燥 4h后称重并分析。
实施例 79
分别称取实施例 67中催化剂 160 mg进行常压聚合实验。将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12 MPa。接着依次向反应釜内加入 40 mL精制正庚垸溶剂,加入用量为 Al/Cr=2.5 的三异丁基铝(TiBA)助催化剂,分别加入经脱水处理的 0.7 mL、 2.1 mL的 1- 己炼, 即 1-己烯与聚合所用溶剂的体积比分别为 1、 3, (分别对应实施例 79-1、 79-2),再加入 30mL脱水脱氧精制后的正庚垸溶剂,调节乙烯压力至 0. 15 MPa。 待釜内温度恒定在 85 °C后, 加入催化剂开始反应。 反应过程中在线采集单体乙 烯的瞬时消耗量 (通过连接电脑的高精密的乙烯质量流量计) 并由电脑记录。 lh后加入 50 mL盐酸 /乙醇混合溶液终止反应。 过滤后将所得聚合物在真空干 燥箱中 60 °C下干燥 4h后称重并分析。
实施例 80
分别称取实施例 67中催化剂 160 mg进行常压聚合实验。将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0. 12MPa。 接着依次向反应釜内加入 40mL 精制的正庚垸溶剂, 加入用量为 Al/Cr=2.5 的三异丁基铝 (TiBA) 作助催化剂, 再加入 30mL脱水脱氧精制后 的正庚垸溶剂,再分别向釜内加入 1 OmL、 20mLH2(分别对应实施例 80- 1、 80-2 )。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质 量流量计) 并由电脑记录。 lh 后加入盐酸 /乙醇混合溶液终止反应。 过滤后将 所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 81
分别称取实施例 62中催化剂 160 mg进行常压聚合实验。将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL 精制的正庚垸溶剂, 加入用量为 Al/Cr=2.5 的三异丁基铝 (TiBA) 作助催化剂, 再加入 30mL脱水脱氧精制后 的正庚垸溶剂,再分别向釜内加入 10mL、20mLH2(分别对应实施例 81-1、81-2)。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质 量流量计) 并由电脑记录。 lh 后加入盐酸 /乙醇混合溶液终止反应。 过滤后将 所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 82
分别称取实施例 63中催化剂 160 mg进行常压聚合实验。将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL 精制的正庚垸溶剂, 加入用量为 Al/Cr=2.5 的三异丁基铝 (TiBA) 作助催化剂, 再加入 30mL脱水脱氧精制后 的正庚垸溶剂,再分别向釜内加入 1 OmL、 20mLH2(分别对应实施例 82- 1、 82-2 )。 调节乙烯压力至 0.15MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质 量流量计) 并由电脑记录。 lh 后加入盐酸 /乙醇混合溶液终止反应。 过滤后将 所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 83
分别称取实施例 67中催化剂 160 mg进行常压聚合实验。将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12 MPa。接着依次向反应釜内加入 40 mL精制正庚垸溶剂,加入用量为 Al/Cr=2.5 的三异丁基铝(TIBA)作为助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸 溶剂, 调节乙烯压力至 0.15 MPa。 聚合温度分别稳定在 45 °C和 65 °C (分别对 应实施例 83-1和 83-2 )时, 加入催化剂开始反应。 反应过程中在线采集单体乙 烯的瞬时消耗量 (通过连接电脑的高精密的乙烯质量流量计) 并由电脑记录。 lh后加入 50 mL盐酸 /乙醇混合溶液终止反应。 过滤后将所得聚合物在真空干 燥箱中 60 °C下干燥 4h后称重并分析。
实施例 84
称取实施例 63中催化剂 160 mg进行常压聚合实验。将聚合反应釜真空加 热除杂, 并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 加入用量为 Al/Cr=2.5的 三乙基铝 (TEA) 作助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质 量流量计) 并由电脑记录。 lh 后加入盐酸 /乙醇混合溶液终止反应。 过滤后将 所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
实施例 85
称取实施例 62中催化剂 160 mg进行常压聚合实验。将聚合反应釜真空加 热除杂, 并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着向反应釜内加入 70mL精制的正庚垸溶剂。 调节乙烯压力至 0. 15 MPa, 待 釜内温度恒定在 85 °C后, 加入催化剂开始反应。反应过程中在线采集单体乙烯 的瞬时消耗量 (通过连接电脑的高精密的乙烯质量流量计) 并由电脑记录。 lh 后加入盐酸 /乙醇混合溶液终止反应。 过滤后将所得聚合物在真空干燥箱中 60 °C下干燥 4h后称重并分析。
实施例 86
称取实施例 67中催化剂 160 mg进行常压聚合实验。将聚合反应釜真空加 热除杂,并用高纯氮气抽排三次,最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 加入用量为 Al/Cr=2.5的 三乙基铝 (TEA) 作助催化剂, 再加入 30mL脱水脱氧精制后的正庚垸溶剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质 量流量计) 并由电脑记录。 lh 后加入盐酸 /乙醇混合溶液终止反应。 过滤后将 所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
对比实施例
将 10 g的硅胶(孔体积为 1.5~1.7 cm3/g, 表面积为 250~300 m2/g)浸渍在 偏钒酸铵的水溶液中 (钒负载量为 0.48 wt% ), 45 °C下连续搅拌 4h直至反应完 全。 然后 12CTC油浴下干燥 6 h后, 转移至 12CTC烘箱干燥 8 h; 将干燥的样品 置于石英流化床内进行焙烧活化, 空气中 45CTC下保温 4 h, 在氮气保护下自然 冷却, 焙烧程序如图 1所示。 然后, 将所得样品再次浸渍在碱式醋酸铬的水溶 液中 (铬负载量为 1 wt% ), 室温下连续搅拌 4h直至反应完全。 然后在 12CTC 油浴下干燥 6h, 转移至鼓风干燥箱中 12CTC干燥 8 h, 然后将得到的样品在流 化床内进行高温焙烧,高纯空气中 60CTC保温 4h,然后在氮气下自然降温冷却, 上述焙烧过程如图 2所示。 最后在氮气保护下将得到的未改性的负载型铬钒双 活性中心催化剂转移至手套箱中保存备用。
对比实施例 ?
将 10 g的硅胶(孔体积为 1.5~1.7 cm3/g, 表面积为 250~300 m2/g)浸渍在 六氟硅酸铵的水溶液中(氟负载量为 1.5wt% ), 45 °C下连续搅拌 4h直至反应完 全。 然后 12CTC油浴下干燥 6 h后, 转移至 12CTC烘箱干燥 8 h; 将干燥的样品 置于石英流化床内进行焙烧活化, 空气中 60CTC下保温 4 h, 在氮气保护下自然 冷却, 焙烧程序如图 1所示。 然后, 将所得样品再次浸渍在碱式醋酸铬的水溶 液中 (铬负载量为 1 wt% ), 室温下连续搅拌 4h直至反应完全。 然后在 12CTC 油浴下干燥 6h, 转移至鼓风干燥箱中 12CTC干燥 8 h, 然后将得到的样品在流 化床内进行高温焙烧,高纯空气中 60CTC保温 4h,然后在氮气下自然降温冷却, 上述焙烧过程如图 2所示。最后在氮气保护下将得到的氟改性的负载型 Phillips 催化剂转移至手套箱中保存备用。
对比实施例
将 10 g的硅胶(孔体积为 1.5~1.7 cm3/g, 表面积为 250~300 m2/g)浸渍在 碱式醋酸铬的水溶液中 (铬负载量为 l wt% ), 45 °C下连续搅拌 4h直至反应完 全。 然后 12CTC油浴下干燥 6 h后, 转移至 12CTC烘箱干燥 8 h; 将干燥的样品 置于石英流化床内进行焙烧活化, 空气中 60CTC下保温 4 h, 在氮气保护下自然 冷却, 焙烧程序如图 2所示。 最后在氮气保护下将得到的未改性的 Phillips催 化剂转移至手套箱中保存备用。
对比实施例 25
将 20 g的硅胶(孔体积为 1.5~1.7 cm3/g, 表面积为 250~300 m2/g)浸渍在 六氟硅酸铵的水溶液中 (氟负载量为 1.5wt% )。 连续搅拌 4小时后, 油浴 120 °C干燥 6h, 再在鼓风干燥箱中 80°C干燥 8 h, 然后将干燥后的样品在流化床内 进行焙烧活化, 高纯空气下 50CTC保温 4h, 硅胶最后在氮气下自然降温冷却, 得到氟改性的硅胶。 然后, 将上述方法制得的 10g氟改性的硅胶浸渍在重铬酸 铵水溶液中(铬负载量为 2wt % ), 室温搅拌浸渍 4h后, 升温至 12CTC干燥 6h, 然后转移至烘箱干燥 6h; 将干燥的样品置于石英流化床内, 高纯空气中 60CTC 焙烧活化 4 h, 得到氟改性的 Phillips催化剂。 将上述方法制得的 10g氟改性的 硅胶浸渍在草酸氧钒水溶液中(钒负载量为 0.96wt% ), 5CTC下搅拌浸渍 4h后, 干燥然后转移至烘箱干燥 6h;将干燥的样品置于石英流化床内在高纯空气中进 行 60CTC焙烧活化 4 h, 在氮气保护下自然冷却, 得到氟改性的负载钒催化剂。 将上述得到的氟改性的 Phillips催化剂和氟改性的负载钒催化剂在氮气保护下, 按照 Cr/V摩尔比 2:1机械混匀, 得到混合催化剂保存备用。
对比实施例^ ί
分别称取对比实施例 22中催化剂 160 mg进行常压聚合实验。将聚合反应 釜真空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 分别加入用量 为 Al/Cr=2.5、 5、 10、 15、 20的三异丁基铝 (TiBA)作助催化剂 (分别对应对 比实施例 26-1、 26-2 , 26-3 , 26-4, 26-5 ) , 再加入 30mL脱水脱氧精制后的正 庚垸溶剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85°C后, 加入催化剂 开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精 密的乙烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
对比实施例 27
分别称取对比实施例 23中催化剂 160 mg进行常压聚合实验。将聚合反应 釜真空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 分别加入用量 为 Al/Cr=2.5、 5、 10、 15、 20的三异丁基铝 (TiBA)作助催化剂 (分别对应对 比实施例 27-1、 27-2 , 27-3 , 27-4, 27-5 ) , 再加入 30mL脱水脱氧精制后的正 庚垸溶剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85°C后, 加入催化剂 开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精 密的乙烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。 对比实施例
分别称取对比实施例 24中催化剂 160 mg进行常压聚合实验。将聚合反应 釜真空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL精制的正庚垸溶剂, 分别加入用量 为 Al/Cr=2.5、 5、 10、 15、 20的三异丁基铝 (TiBA)作助催化剂 (分别对应对 比实施例 28-1、 28-2 , 28-3 , 28-4, 28-5 ) , 再加入 30mL脱水脱氧精制后的正 庚垸溶剂。调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85°C后, 加入催化剂 开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精 密的乙烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
对比实施例 29
分别称取对比实施例 22中催化剂 160 mg进行常压聚合实验。将聚合反应 釜真空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12 MPa。 接着依次向反应釜内加入 40 mL 精制正庚垸溶剂, 加入用量为 Al/Cr=2.5的三异丁基铝 (TIBA) 助催化剂, 分别加入经脱水处理的 0.7 mL、 2.1 mL的 1-己炼, 即 1-己烯与聚合所用溶剂的体积比分别为 1、 3, (分别对应 对比实施例 29-1、 29-2), 再加入 30mL脱水脱氧精制后的正庚垸溶剂, 调节乙 烯压力至 0.15 MPa。待釜内温度恒定在 85°C后, 加入催化剂开始反应。 反应过 程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质量流量 计) 并由电脑记录。 lh后加入 50 mL盐酸 /乙醇混合溶液终止反应。 过滤后将 所得聚合物在真空干燥箱中 60 °C下干燥 4h后称重并分析。
对比实施例
分别称取对比实施例 24中催化剂 160 mg进行常压聚合实验。将聚合反应 釜真空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12 MPa。 接着依次向反应釜内加入 40 mL 精制正庚垸溶剂, 加入用量为 Al/Cr=2.5的三异丁基铝 (TIBA) 助催化剂, 分别加入经脱水处理的 0.7 mL、 2.1 mL的 1-己炼, 即 1-己烯与聚合所用溶剂的体积比分别为 1、 3, (分别对应 对比实施例 30-1、 30-2), 再加入 30mL脱水脱氧精制后的正庚垸溶剂, 调节乙 烯压力至 0.15 MPa。待釜内温度恒定在 85°C后, 加入催化剂开始反应。 反应过 程中在线采集单体乙烯的瞬时消耗量(通过连接电脑的高精密的乙烯质量流量 计) 并由电脑记录。 lh后加入 50 mL盐酸 /乙醇混合溶液终止反应。 过滤后将 所得聚合物在真空干燥箱中 60 °C下干燥 4h后称重并分析。
对比实施例^?
分别称取对比实施例 22中催化剂 160 mg进行常压聚合实验。将聚合反应 釜真空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL 精制的正庚垸溶剂, 加入用量为 Al/Cr=2.5 的三异丁基铝 (TiBA) 作助催化剂, 再加入 30mL脱水脱氧精制后 的正庚垸溶剂,再分别向釜内加入 10mL、 20mLH2 (分别对应对比实施例 31-1、
31- 2)。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开 始反应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密 的乙烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
对比实施例
分别称取对比实施例 24中催化剂 160 mg进行常压聚合实验。将聚合反应 釜真空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL 精制的正庚垸溶剂, 加入用量为 Al/Cr=2.5 的三异丁基铝 (TiBA) 作助催化剂, 再加入 30mL脱水脱氧精制后 的正庚垸溶剂,再分别向釜内加入 10mL、 20mLH2 (分别对应对比实施例 32-1、
32- 2)。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85 °C后, 加入催化剂开 始反应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密 的乙烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。
对比实施例 ϋ
分别称取对比实施例 22中催化剂 160 mg进行常压聚合实验。将聚合反应 釜真空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12 MPa。 接着依次向反应釜内加入 40 mL 精制正庚垸溶剂, 加入用量为 Al/Cr=2.5 的三异丁基铝 (TiBA) 作为助催化剂, 再加入 30mL脱水脱氧精制 后的正庚垸溶剂, 调节乙烯压力至 0.15 MPa。 聚合温度分别稳定在 45°C和 65 V (分别对应对比实施例 33-1和 33-2) 时, 加入催化剂开始反应。 反应过程中 在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密的乙烯质量流量计) 并由电脑记录。 lh后加入 50 mL盐酸 /乙醇混合溶液终止反应。 过滤后将所得 聚合物在真空干燥箱中 60 °C下干燥 4h后称重并分析。
对比实施例
分别称取对比实施例 24中催化剂 160 mg进行常压聚合实验。将聚合反应 釜真空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12 MPa。 接着依次向反应釜内加入 40 mL 精制正庚垸溶剂, 加入用量为 Al/Cr=2.5 的三异丁基铝 (TIBA) 作为助催化剂, 再加入 30mL脱水脱氧精制 后的正庚垸溶剂, 调节乙烯压力至 0.15 MPa。 聚合温度分别稳定在 45°C和 65 V (分别对应对比实施例 34-1和 34-2) 时, 加入催化剂开始反应。 反应过程中 在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精密的乙烯质量流量计) 并由电脑记录。 lh后加入 50 mL盐酸 /乙醇混合溶液终止反应。 过滤后将所得 聚合物在真空干燥箱中 60 °C下干燥 4h后称重并分析。
对比实施例
称取对比实施例 22中催化剂 160 mg进行常压聚合实验。将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL 精制的正庚垸溶剂, 加入用量为 Al/Cr=2.5的三乙基铝 (TEA)作助催化剂, 再加入 30mL脱水脱氧精制后的正 庚垸溶剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85°C后, 加入催化剂 开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精 密的乙烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析
对比实施例
称取对比实施例 24中催化剂 160 mg进行常压聚合实验。将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL 精制的正庚垸溶剂, 加入用量为 Al/Cr=2.5的三乙基铝 (TEA)作助催化剂, 再加入 30mL脱水脱氧精制后的正 庚垸溶剂。调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85°C后, 加入催化剂 开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的高精 密的乙烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止反应。 过滤后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。 对比实施例 ·?7
称取对比实施例 25中催化剂 160 mg进行常压聚合实验。将聚合反应釜真 空加热除杂, 并用高纯氮气抽排三次, 最后向反应釜内充微量精制乙烯至 0.12MPa。 接着依次向反应釜内加入 40mL 精制的正庚垸溶剂, 加入用量为 Al/Cr=2.5 的三异丁基铝 (TiBA) 作助催化剂, 再加入 30mL脱水脱氧精制后 的正庚垸溶剂。 调节乙烯压力至 0.15 MPa, 待釜内温度恒定在 85°C后, 加入催 化剂开始反应。 反应过程中在线采集单体乙烯的瞬时消耗量 (通过连接电脑的 高精密的乙烯质量流量计) 并由电脑记录。 lh后加入盐酸 /乙醇混合溶液终止 反应。 过滤后将所得聚合物在真空干燥箱中 6CTC下干燥 4h后称重并分析。 表 各实施例的乙烯聚合活性
Figure imgf000118_0001
实施例 80-2 83.4 实施例 81-1 62.3 实施例 81 -2 51.4 实施例 82-1 81.2 实施例 82-2 75.4 实施例 83-1 315.2 实施例 83-2 243.7 实施例 84 78.5 实施例 85 31.6 实施例 86 93.2 对比实施例 26-1 149.0 对比实施例 26-2 114.4 对比实施例 26-3 87.5 对比实施例 264 83.4 对比实施例 26-5 71.4 对比实施例 27-1 96.5 对比实施例 27-2 51.2 对比实施例 27-3 39.4 对比实施例 274 32.3 对比实施例 27-5 22.8 对比实施例 28-1 131.6 对比实施例 28-2 100.3 对比实施例 28-3 77.7 对比实施例 284 64.1 对比实施例 28-5 66.3 对比实施例 29-1 114.3 对比实施例 29-2 97.3 对比实施例 30-1 104.5
对比实施例 30-2 84.9
对比实施 31-1 136.6
对比实施 31-2 135.1
对比实施例 32-1 105.6
对比实施例 32-2 105.0
对比实施 33-1 140.3
对比实施 33-2 226.5
对比实施 34-1 162.7
对比实施 34-2 265.8
对比实施例 35 99.1
对比实施例 36 121. 9
注: 本发明凡是含锆的催化剂其聚合活性以单位摩尔锆计算, 下文同。) 助催化剂浓度对聚合活性和产物性能的影响
表 18助催化剂用量对氟改性和未改性的负载型铬钒 金属氧化物双活性中心催化剂、氟改性 /iA/a^s催化剂、未改性 iM^s催化剂催化乙烯均聚 的影响
活性 瑢点 c) 重均分子量
实施例 Al/Cr PDI
(kg PE/molCr h) C xl05 )
实施例 76-1 2.5 105.1 131.2 5.21 22.7 实施例 76-2 5 62.6 131.9 6.23 25. 4 实施例 76-3 10 55.0 132.4 7.98 34.3 实施例 76-4 15 50.6 132.7 7.15 28.5 实施例 76-5 20 44.3 132.5 6.38 30. 8 对比实施例 26-1 2.5 149.0 131.2 4.40 25.5 对比实施例 26-2 5 114.4 131.9 4.79 26. 1 对比实施例 26-3 10 87.5 132.2 7.13 29.7 对比实施例 26-4 15 83.4 131.7 6.42 28.5 对比实施例 26-5 20 71.4 131.3 6.17 25.6 对比实施例 27-1 2.5 96.5 131.0 4.78 22.3 对比实施例 27-2 5 51.2 131.9 6.31 21.7 对比实施例 27-3 10 39.4 132.2 7.13 28.9 对比实施例 27-4 15 32.3 131.8 7.02 26.1 对比实施例 27-5 20 22.8 132.0 5.97 24.7 对比实施例 28-1 2.5 131.6 131.1 3.28 23.8 对比实施例 28-2 5 100.3 131. 3 5.41 22. 1 对比实施例 28-3 10 77.7 131.9 6.33 27. 3 对比实施例 28-4 15 64.1 131.7 5.82 29.4 对比实施例 28-5 20 66.3 131.5 5.37 25.6 聚合条件: 乙烯压力 =0.15 MPa; 聚合时间 =l h; 聚合温度 =85°C ; 正庚垸 =70 mL; 助催化剂=118 ; Cr=lwt%。
从图 8可知,在以三异丁基铝(TiBA)为助催化剂的条件下(实施例 76-1、 76-2, 76-3、 76-4、 76-5和对比实施例 26-1、 26-2, 26-3 , 26-4, 26-5 , 27-1 , 27-2, 27-3 , 27-4, 27-5 , 28-1 , 28-2, 28-3 , 28-4, 28-5 ) , 随着助催化剂用量 的不断加大, 氟改性和未改性的负载型铬钒金属氧化物双活性中心催化剂、 氟 改性 phillips催化剂、 未改性 phillips催化剂催化乙烯均聚的活性呈现下降的趋 势, 而聚合物的分子量呈现出先升高后降低的趋势, 说明要得到所需的聚合物 分子量, 助催化剂的用量是有一个合适的值或者范围。 采用除 TiBA以外的其 他助催化剂也存在类似的规律。
(2) 助催化剂种类对聚合活性和产物性能的影响
表 19助催化剂种类对氟改性和未改性的负载型铬钒 金属氧化物双活性中心催化剂、 未改性 ^催化剂催化乙烯均聚的影响
助催 活性 瑢点 重均分子
实施例 PDI 化剂 (kg PE/molCr h) CO 量 105) 实施例 76-1 TiBA 105.1 131.2 5.21 22.7 实施例 86 TEA 93.2 131.3 2.25 23.3 对比实施例 26-1 TiBA 149.0 131.2 4.40 25.5 对比实施例 35 TEA 99.1 132.1 2.69 15.6 对比实施例 28-1 TiBA 131.6 131.1 3.28 23.8 对比实施例 36 TEA 121.9 131.2 1.94 11.3 聚合条件: 乙烯压力 =0.15 MPa; 聚合时间 =l h; 聚合温度 =85 °C ; 正庚垸
=70 mL; Al/Cr=2.5; Cr=lwt%。
表 19给出了采用不同助催化剂对对氟改性和未改性的负载型铬钒金属氧 化物双活性中心催化剂、未改性 phillips催化剂催化乙烯均聚活性(实施例 76-1、 86和对比实施例 26-1、 35、 28-1 , 36)。 可见, 采用三异丁基铝 (TiBA) 作助 催化剂时, 两种催化剂的活性均明显高于采用三乙基铝 (TEA) 作助催化剂时 的乙烯均聚活性。 进一步通过对上述产品聚乙烯的分析可知, 在不同助催化剂 作用下的产品聚乙烯都有类似的熔点, 但是其分子量和分子量分布大不相同, 说明助催化剂对催化剂活性中心的还原程度和还原后的分布有较大的影响。 (3 ) 聚合温度对聚合活性和产物性能的影响
轰 20温度对氟改性和未改性的负载型铬钒
金属氧化物双活性中心催化剂、 未改性 /iA/a^s催化剂催化乙烯均聚的影响
活性 瑢点 黏均分子量
温度
实施例 (kg E molCr O Cxio5)
PDI
(c)
h)
实施例 83-1 45 315.2 131.7 10.12 21.5 实施例 83-2 65 243.7 130.8 9.89 20.9 实施例 76-1 85 105.1 131.2 9.01 22.7 对比实施例 33-1 45 140.3 134.1 6.36 21.9 对比实施例 33-2 65 226.5 131.1 5.90 22.9 对比实施例 26-1 85 149.0 131.2 5.76 25.5 对比实施例 34-1 45 162.7 133.5 6.18 20.6 对比实施例 34-2 65 265.8 130.6 4.22 21.8 对比实施例 28-1 85 131.6 131.1 3.47 23.8 聚合条件: 乙烯压力 =0.15MPa; 聚合时间 =lh; 正庚垸 =70mL; 助催化剂 =TiBA; Al/Cr=2.5; Cr=lwt%
表 20 为不同聚合温度下的氟改性和未改性的负载型铬钒金属氧化物双活 性中心催化剂、未改性 phillips催化剂的乙烯均聚活性(实施例 83-1 83-2 76-1 和对比实施例 33-1 33-2, 26-1 , 34-1 34-2 , 28-1 )。 不同聚合温度下得到的 聚乙烯产品都有类似的熔点, 氟改性的负载型铬钒金属氧化物双活性中心催化 剂其分子量随着聚合温度的升高出现降低的趋势, 说明聚合温度升高对聚合反 应链转移更有利。
(4) 1-己烯用量对乙 己烯共聚性能的影响
表 W J-己烯用量对乙^ -己烯共聚性能的影响
~~ ai S 焙点 重均分子量 实施例 PDI
(mL) (kg pE/molCr h) CO ( χΐθ5)
实施例 76-1 0 105.1 131.2 5.21 22.7 实施例 79-1 0.7 73.9 131.7 4.57 20.3 实施例 79-2 2.1 61.3 131.5 3.47 16.9 对比实施例 26-1 0 149.0 131.2 4.40 25.5 对比实施例 29-1 0.7 114.3 131.8 4.21 24.9 对比实施例 29-2 2.1 97.3 131.6 4.01 25.4 对比实施例 28-1 0 131.6 131.1 3.28 23.8 对比实施例 30-1 0.7 104.5 132.2 3.02 20.8 对比实施例 30-2 2.1 84.9 131.9 2.83 18.0 聚合条件: 乙烯压力 =0.15 MPa; 聚合时间 =l h; 聚合温度 =85°C ; 正庚垸 =70 mL; 助催化剂=118 ; Al/Cr=2.5; Cr=lwt%。
表 21给出了氟改性和未改性的负载型铬钒金属氧化物双活性中心催化剂、 未改性 phillips催化剂催化乙 己烯聚合的活性 (实施例 76-1、 79-1、 79-2 和对比实施例 26-1、 29-1 , 29-2, 28-1 , 30-1、 30-2)。 随着 1-己烯用量的增大, 氟改性负载型铬钒金属氧化物双活性中心催化剂的乙烯 /1-己烯共聚活性呈现 出降低的趋势, 结合之前乙烯均聚的结果, 表明乙烯 /1-己烯共聚活性均低于乙 烯均聚的活性。 随着 1-己烯用量的增加聚合物分子量不断下降。
(5 ) 氢气用量对聚合性能的影响
表 氢气用量对二氟改性和未改性的负载型铬钒
金属氧化物双活性中心催化剂、 未改性 /iA/a^s催化剂聚合反应活性的影响
氢气 用 活性 瑢点 重均分
实施例 PDI 量 (mL) (kg PE/molCr h) O 子量 (χΐο5)
实施例 76-1 0 105.1 131.2 5.21 22.7 实施例 80-1 10 98.6 131.4 3.84 27.4 实施例 80-2 20 83.4 131.1 3.05 28.5 对比实施 26-1 0 149.0 131.2 4.40 25.5 对比实施 31-1 10 136.6 131.2 2.90 18.9 对比实施 31-2 20 135.1 131.1 2.63 17.5 对比实施 28-1 0 131.6 131.1 3.28 23.8 对比实施 32-1 10 105.6 131.1 2.04 14.7 对比实施 33-2 20 105.0 131.1 1.95 15.5 聚合条件: 乙烯压力 =0.15 MPa; 聚合时间 =l h; 聚合温度 =85°C ; 正庚垸 =70 mL; 助催化剂=118入, Al/Cr=2.5。
氟改性和未改性的负载型铬钒金属氧化物双活性中心催化剂、 未改性 Phillips催化剂的聚合反应时氢调的影响如表 所示(实施例 76-1、 80-1 , 80-2 和对比实施例 26-1、 31-1、 31-2, 28-1 , 32-1 , 33-2)。 可见, 氢调后的氟改性 负载型铬钒双活性中心催化剂的乙烯均聚活性均比没有氢气存在条件下有所 降低, 且聚乙烯的分子量大幅降低, 说明氢气起到一个明显的链转移剂的作用 导致聚乙烯的分子量下降。

Claims

1. 一种负载型金属氧化物双活性中心乙烯聚合催化剂, 其特征在于: 所 述的催化剂组成包括无机载体和负载的两种活性组分, 所述两种活性组分包括 铬氧化物和钒氧化物。
2. 根据权利要求 1所述的催化剂, 其特征在于,所述催化剂还包括改性组 分; 所述改性组分选自二氧化钛和氟中的一种。
3. 根据权利要求 1或 2所述的催化剂, 其特征在于,所述无机载体选自二 氧化硅、 三氧化二铝、 二氧化钛、 氧化锆、 氧化镁、 氧化钙、 无机粘土和它们 的组合。
4. 根据权利要求 1或 2所述的催化剂, 其特征在于,所述无机载体为多孔 型, 其比表面积为 50~500 m7g。
5. 根据权利要求 1或 2所述的催化剂, 其特征在于,所述无机载体的孔体 积为 0. 1-5. 0 cmVg ,, 平均孔径在 l~50nm。
6. 根据权利要求 1或 2所述的催化剂, 其特征在于, 所述无机载体上的 Cr负载量为催化剂总重量的 0. 01~10wt%, 按 Cr的重量计。
7. 根据权利要求 1或 2所述的催化剂, 其特征在于,在所述无机载体上的 V负载量 (按钒的重量计) 为 Cr负载量 (以铬的重量计) 的 10~500 %。
8. 根据权利要求 1或 2所述的催化剂, 其特征在于,在所述无机载体上钒 负载量为催化剂总重量的 0. 01~10wt% (按钒的重量计)。
9. 根据权利要求 1或 2所述的催化剂, 其特征在于,铬活性组分的原料为 水溶性含铬盐; 所述水溶性含铬盐选自三氧化铬、 硝酸铬、 醋酸铬、 氯化铬、 硫酸铬、 铬酸铵、 重铬酸铵、 碱式醋酸铬、 其它合适的可溶性铬盐以及它们的 组合中的一种或几种。
10. 根据权利要求 1或 2所述的催化剂, 其特征在于,钒活性组分的原料 为水溶性含钒盐和非水溶性含钒盐; 所述水溶性含钒盐选自六氟钒酸铵、 硝酸 钒、 草酸氧钒、 偏钒酸铵、 硫酸氧钒、 硫酸氧化钒(IV)水合物、 硫酸钒(111)、 三氯代氧化钒、 原钒酸钠、 偏钒酸钠等; 所述非水溶性含钒盐选自双乙酰丙酮 氧化钒、 三异丙醇氧钒、 三丙醇氧化钒、 乙酰丙酮钒、 氧化三乙氧基钒、 氯化 氧钒、 硅化三钒、 其它合适的可溶性钒盐以及它们的组合。
11. 根据权利要求 2 所述的催化剂, 其特征在于,其钛负载量为催化剂总 重量的 0. 01~30wt% , 按 Ti的重量计。
12. 根据权利要求 2 所述的催化剂, 其特征在于,其氟负载量为催化剂总 重量的 0. 01~10wt% , 按氟的重量计。
13. 根据权利要求 2 所述的催化剂, 其特征在于,用于制备二氧化钛改性 组分的钛化合物原料为乙酰丙酮氧钛、 三氯化钛、 四氯化钛、 叔丁醇钛、 钛酸 四正丁酯、 硫酸氧钛、 硫酸钛、 六氟钛酸铵、 钛酸异丙酯、 钛酸四乙酯、 其它 合适的可溶性钛盐以及它们的组合。
14. 根据权利要求 2 所述的催化剂, 其特征在于,用于制备氟改性组分的 氟化合物原料为氟化铵、 双氟化铵、 氟硼酸铵、 氟硼酸铜、 氟硼酸银、 氟硼酸 金、 氟硅酸铜、 氟硅酸银、 氟硅酸金、 氟硼酸铵和六氟钒酸铵、 六氟硅酸铵、 氟硼酸锌、 氟硅酸镁、 氟硅酸锌、 氟硼酸钠、 其它合适的可溶性氟盐以及它们 的组合。
15. 一种权利要求 1所述的催化剂的制备方法, 其特征在于, 所述方法如 下: i ) 将无机载体浸渍含有钒的溶液, 然后干燥, 接着在高温 300~90(TC下 焙烧活化;
ϋ ) 将步骤 i ) 所得的产物浸渍含有铬的溶液, 然后干燥, 接着在高温 300~90(TC下焙烧活化, 得到所述催化剂保存备用。
16. 一种权利要求 1所述的催化剂的制备方法, 其特征在于, 所述方法如 下:
i ) 将无机载体浸渍含有钒和铬的溶液, 然后干燥;
ii ) 将 i ) 所得的产物在高温 300~90(TC下焙烧活化, 得到所述催化剂保 存备用。
17. 一种权利要求 1所述的催化剂的制备方法, 其特征在于, 所述方法如 下:
i ) 将无机载体浸渍含有铬的溶液, 然后干燥, 接着在高温 300~90(TC下 焙烧活化;
ϋ ) 将步骤 i ) 所得的产物浸渍含有钒的溶液, 然后干燥, 接着在高温 300~90(TC下焙烧活化, 得到所述催化剂保存备用。
18. 一种权利要求 1所述的催化剂的制备方法, 其特征在于, 所述方法如 下:
将上述权利要求 15、 16、 17 中任意一种方法制备的负载型铬钒双活性中 心催化剂, 进一步加入有机金属助催化剂进行预还原活化处理, 干燥后得到所 述预还原活化的催化剂保存备用。
19. 一种权利要求 2所述的催化剂的制备方法, 所述方法先制备二氧化钛 改性的无机载体, 然后再负载铬和钒活性组分得到催化剂, 其特征在于, 所述二氧化钛改性的无机载体其制备方法选自如下四种之一-
( 1 ) 浸渍法: 将钛化合物溶于溶剂中与无机载体搅拌混匀进行反应, 然 后干燥, 接着在高温 300~90(TC下焙烧活化, 得到所述二氧化钛改性的无机载 体;
( 2 ) 共沉淀法: 将钛化合物和硅酸化合物混匀进行反应, 然后干燥, 接 着在高温 300~90(TC下焙烧活化, 得到所述二氧化钛改性的无机载体;
( 3) 溶胶-凝胶法: 将钛化合物与水和无水乙醇进行水解反应, 反应完毕 后再加入无机酸和无机载体进行反应, 然后干燥, 接着在高温 300~90(TC下焙 烧活化, 得到所述二氧化钛改性的无机载体;
( 4)溶胶-凝胶法: 将钛化合物与有机溶剂混匀后搅拌,加入酸回流反应, 再加入无机载体反应, 然后干燥, 接着在高温 300~90(TC下焙烧活化, 得到所 述二氧化钛改性的无机载体。
20. 根据权利要求 19 中所述的催化剂的制备方法, 其特征在于, 所述的 硅酸化合物选自硅酸铝、 硅酸钠、 正硅酸乙酯、 硅酸镁和硅酸钙、 其它合适的 可溶性硅酸盐以及它们的组合。
21. 一种权利要求 2所述的催化剂的制备方法, 所述方法先制备氟改性的 无机载体, 然后再负载铬和钒活性组分得到催化剂, 其特征在于,
所述氟改性的无机载体其制备方法为浸渍法; 所述浸渍法将无机载体浸渍 含有氟的溶液, 然后干燥, 接着在高温 200~900°C下焙烧活化, 得到氟改性的 无机载体。
22. 一种权利要求 2所述的催化剂的制备方法, 其特征在于, 所述方法如 下: i ) 按照权利要求 19 中的任一种方法制备出二氧化钛改性的无机载体或 者按照权利要求 21中的方法制备出氟改性的无机载体;
ϋ ) 将步骤 i ) 得到的二氧化钛改性的或者氟改性的无机载体浸渍含有钒 的溶液, 然后干燥, 接着在高温 300~90(TC下焙烧活化;
iii ) 将步骤 ii ) 所得的产物浸渍含有铬的溶液, 然后干燥, 接着在高温 300~90(TC下焙烧活化, 得到所述催化剂保存备用。
23. 一种权利要求 2所述的催化剂的制备方法, 其特征在于, 所述方法如 下:
i ) 按照权利要求 19 中的任一种方法制备出二氧化钛改性的无机载体或 者按照权利要求 21中的方法制备出氟改性的无机载体;
ϋ ) 将步骤 i ) 得到的二氧化钛改性的或者氟改性的无机载体浸渍含有钒 和铬的溶液, 然后干燥;
iii) 将步骤 ii ) 所得的产物在高温 300~90(TC下焙烧活化, 得到所述催化 剂保存备用。
24. 一种权利要求 2所述的催化剂的制备方法, 其特征在于, 所述方法如 下:
i ) 按照权利要求 19 中的任一种方法制备出二氧化钛改性的无机载体或 者按照权利要求 21中的方法制备出氟改性的无机载体;
ϋ ) 将步骤 i ) 得到的二氧化钛改性的或者氟改性的无机载体浸渍含有铬 的溶液, 然后干燥, 接着在高温 300~90(TC下焙烧活化;
iii ) 将步骤 ii ) 所得的产物浸渍含有钒的溶液, 然后干燥, 接着在高温 300~90(TC下焙烧活化, 得到所述催化剂保存备用。
25. 一种权利要求 2 所述的催化剂的制备方法, 其特征在于, 所述方法 如下- i ) 将无机载体浸渍含有钛和钒的溶液或者氟和钒的溶液, 然后干燥, 接 着在高温 300~90(TC下焙烧活化;
ϋ ) 将步骤 i ) 所得的产物浸渍含有铬的溶液, 然后干燥, 接着在高温 300~90(TC下焙烧活化, 得到所述催化剂保存备用。
26. 一种权利要求 2所述的催化剂的制备方法, 其特征在于, 所述方法如 下:
i ) 将无机载体浸渍含有钛和铬的溶液或者氟和铬的溶液, 然后干燥, 接 着在高温 300~90(TC下焙烧活化;
ϋ ) 将步骤 i ) 所得的产物浸渍含有钒的溶液, 然后干燥, 接着在高温 300~90(TC下焙烧活化, 得到所述催化剂保存备用。
27. 一种权利要求 2所述的催化剂的制备方法, 其特征在于, 所述方法如 下:
i ) 将无机载体浸渍含有钛、 钒和铬的溶液, 然后干燥;
ϋ ) 将步骤 i ) 所得的产物在高温 300~90(TC下焙烧活化, 得到所述催化 剂保存备用。
28. 一种权利要求 2所述的催化剂的制备方法, 其特征在于, 所述方法如 下:
i ) 将无机载体浸渍含有氟、 钒和铬的溶液, 然后干燥;
ϋ ) 将步骤 i ) 所得的产物在高温 200~90(TC下焙烧活化, 得到所述催化 剂保存备用。
29. 一种权利要求 2所述的催化剂的制备方法, 其特征在于, 所述方法如 下:
将上述权利要求 22~28中任意一种方法制备的二氧化钛改性的或者氟改性 的负载型铬钒氧化物双活性中心催化剂, 进一步加入有机金属助催化剂进行预 还原活化处理, 干燥后得到所述预还原活化的催化剂保存备用。
30. 根据权利要求 1~29任一项所述的负载型铬钒双活性中心催化剂 (包 括经过有机金属助催化剂预还原活化的负载型铬钒双活性中心催化剂), 其特 征在于, 用于生产乙烯均聚物和乙烯 / a -烯烃共聚物的用途。
31. 根据权利要求 29或 30所述的催化剂, 其特征在于, 所述有机金属助 催化剂包括有机铝化合物、 有机锂化合物、 有机硼化合物等常用作烯烃聚合反 应助催化剂中的任何一种或者是它们的组合。
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