WO2008116396A1 - Composite catalyst for production of polyethylene - Google Patents
Composite catalyst for production of polyethylene Download PDFInfo
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- WO2008116396A1 WO2008116396A1 PCT/CN2008/000625 CN2008000625W WO2008116396A1 WO 2008116396 A1 WO2008116396 A1 WO 2008116396A1 CN 2008000625 W CN2008000625 W CN 2008000625W WO 2008116396 A1 WO2008116396 A1 WO 2008116396A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F10/02—Ethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2410/00—Features related to the catalyst preparation, the catalyst use or to the deactivation of the catalyst
- C08F2410/01—Additive used together with the catalyst, excluding compounds containing Al or B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F4/00—Polymerisation catalysts
- C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
- C08F4/44—Metals; 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
- C08F4/60—Metals; 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
- C08F4/62—Refractory metals or compounds thereof
- C08F4/639—Component covered by group C08F4/62 containing a transition metal-carbon bond
- C08F4/63904—Component covered by group C08F4/62 containing a transition metal-carbon bond in combination with another component of C08F4/62
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F4/00—Polymerisation catalysts
- C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
- C08F4/44—Metals; 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
- C08F4/60—Metals; 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
- C08F4/62—Refractory metals or compounds thereof
- C08F4/64—Titanium, zirconium, hafnium or compounds thereof
- C08F4/659—Component covered by group C08F4/64 containing a transition metal-carbon bond
- C08F4/65912—Component covered by group C08F4/64 containing a transition metal-carbon bond in combination with an organoaluminium compound
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F4/00—Polymerisation catalysts
- C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
- C08F4/44—Metals; 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
- C08F4/60—Metals; 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
- C08F4/62—Refractory metals or compounds thereof
- C08F4/64—Titanium, zirconium, hafnium or compounds thereof
- C08F4/659—Component covered by group C08F4/64 containing a transition metal-carbon bond
- C08F4/65916—Component covered by group C08F4/64 containing a transition metal-carbon bond supported on a carrier, e.g. silica, MgCl2, polymer
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F4/00—Polymerisation catalysts
- C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
- C08F4/44—Metals; 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
- C08F4/60—Metals; 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
- C08F4/62—Refractory metals or compounds thereof
- C08F4/64—Titanium, zirconium, hafnium or compounds thereof
- C08F4/659—Component covered by group C08F4/64 containing a transition metal-carbon bond
- C08F4/6592—Component covered by group C08F4/64 containing a transition metal-carbon bond containing at least one cyclopentadienyl ring, condensed or not, e.g. an indenyl or a fluorenyl ring
- C08F4/65922—Component covered by group C08F4/64 containing a transition metal-carbon bond containing at least one cyclopentadienyl ring, condensed or not, e.g. an indenyl or a fluorenyl ring containing at least two cyclopentadienyl rings, fused or not
- C08F4/65925—Component covered by group C08F4/64 containing a transition metal-carbon bond containing at least one cyclopentadienyl ring, condensed or not, e.g. an indenyl or a fluorenyl ring containing at least two cyclopentadienyl rings, fused or not two cyclopentadienyl rings being mutually non-bridged
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/582—Recycling of unreacted starting or intermediate materials
Definitions
- the present invention relates to a composite catalyst useful for producing polyethylene comprising at least a first catalyst and a second catalyst separated by a polymer layer, the first catalyst and the second catalyst being the same or different.
- the present invention relates to a composite catalyst useful for producing a broad molecular weight distribution of polyethylene in a single reactor.
- the present invention also relates to a process for the preparation of the catalyst, and a process for producing polyethylene using the composite catalyst. Background technique
- Patent US 7,141,632 discloses a "metallocene-metallocene" composite catalyst comprising a good comonomer in combination with a metallocene compound and a poor comonomer in combination with a metallocene compound. Since the hydrogen modulating properties of the two metallocene compounds are substantially equivalent, the distribution of the molecular weight can be adjusted by utilizing the difference in the copolymerization ability.
- the produced polyethylene resin has improved mechanical properties and processability and can be used in the field of thin films.
- US Patent Nos. 5,614,456, US 6, 943, 134, US 7, 129, 302 disclose It is a composite catalyst of Mao-Zigler.
- the metallocene catalyst produces a low molecular weight with more branching due to better copolymerization and hydrogen modulating ability.
- the polymer, while the Ziegler-Natta catalyst produces a high molecular weight polymer with less branching due to poor copolymerization and hydrogen modulating ability.
- the mechanical properties of the resin thus obtained are still not ideal.
- the Ziegler-Natta catalyst Compared to the Ziegler-Natta catalyst and the chromium-based catalyst (also known as Phi ll ips catalyst), the Ziegler-Natta catalyst has better hydrogen-tuning properties and poor copolymerization properties.
- the chromium-based catalyst has excellent properties. Copolymerization without hydrogen regulation. Therefore, Ziegler-Natta catalysts can produce higher density polyethylene resins with very low molecular weight in the same polymerization conditions in the presence of hydrogen and comonomers, while chromium catalysts can produce high molecular weight. Lower density polyethylene resin. Unfortunately, these two types of catalyst systems may interact with each other, making it difficult to form a "Zigler-Chromium" composite catalyst on the same support.
- Still another object of the present invention is to provide a process for preparing the composite catalyst of the present invention.
- a further object of the invention is to provide a process for the production of polyethylene which comprises contacting ethylene and optionally at least one alpha-olefin comonomer with a composite catalyst of the invention under polymerization conditions.
- the second catalyst is in contact with the composite catalyst of the present invention.
- the present invention provides a composite catalyst useful for the production of polyethylene comprising at least a first catalyst and a second catalyst separated by a polymer layer, the first catalyst and the second catalyst being the same or different.
- isolated with a polymer layer means that a polymer layer is present in the composite catalyst particles, one catalyst is located below the polymer layer, and another catalyst is in the polymer layer or in the Above the polymer layer.
- the first catalyst and the second catalyst "isolated with the polymer layer” may be partially in contact with each other, for example, at the interface between the catalyst under the polymer layer and the polymer layer.
- the composite catalyst of the present invention consists essentially of the following components:
- the composite catalyst of the invention consists of the above components a), b) and c).
- the carrier which can be used in the present invention includes various particulate organic and inorganic carriers which are generally used in the field of polyolefin catalysts.
- organic vehicles include, but are not limited to, ethylene copolymers, propylene copolymers, 4-mercapto-1-pentene copolymers, polyacrylonitrile, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polystyrene, and benzene.
- Ethylene copolymers preferably polystyrene and styrene copolymers.
- inorganic supports include, but are not limited to, silica, alumina, zirconia, cerium oxide, titanium dioxide, silica-alumina, silica-magnesia, montmorillonite, and combinations thereof, preferably silica.
- a further example of an inorganic carrier is magnesium dimeride, preferably magnesium dichloride.
- the respective catalysts contained in the composite catalyst of the present invention may be independently selected from the group consisting of metallocene catalysts, non-metallocene single-site catalysts (for example, those having an amino group and/or a phenoxy group-type ligand in the catalyst compound) a non-metallocene pre-transition metal catalyst, and a non-metallocene post-transition metal catalyst including those having a diimine or a diimine pyridyl ligand in a catalyst compound, Ziegler-Natta catalyst , chromium-based catalysts (also known as Phi ll ips catalysts), and their procatalysts.
- metallocene catalysts non-metallocene single-site catalysts (for example, those having an amino group and/or a phenoxy group-type ligand in the catalyst compound)
- a non-metallocene pre-transition metal catalyst for example, those having an amino group and/or a phenoxy group-
- catalyst refers to a procatalyst which, upon contact with a cocatalyst, catalyzes the polymerization of an olefin.
- Metallocene catalysts are well known in the art. There is no particular limitation on the metallocene catalyst which may be contained in the composite catalyst of the present invention.
- a typical metallocene compound is generally described as containing a bond to at least one gold
- Typical examples of such bulky ligands include, but are not limited to, cyclopentadienyl ligands or cyclopentadienyl type ligand structures or other similar functional ligand structures such as pentadienyl, cyclooctatedioldiyl, Cyclobutadienyl or substituted allyl ligand.
- the metal atom is preferably selected from Groups 3 - 15 of the Periodic Table of Elements and / or lanthanide or actinide elements.
- the metal is a transition metal selected from the group consisting of 3-12, more preferably 4, 5 and 6, most preferably the transition metal is selected from Group 4.
- the metallocene compound can be expressed by the following formula (I):
- M is a 4, 5 or 6 transition metal, preferably a Group 4 transition metal, more preferably titanium, zirconium or hafnium
- Cp is a cyclopentadiene type ligand such as cyclopentadiene Base ligand, sulfhydryl ligand, benzofluorenyl ligand, fluorenyl ligand, dibenzo[b,h] fluorenyl ligand, benzo[b]fluorenyl ligand
- A is monoanionic instability a ligand such as a weak base such as an amine, a phosphine, an ether, a carboxylate, a diene, a hydrocarbon group having 1 to 20 carbon atoms, a hydride or a halogen, or the like; or a combination thereof; (m+n) is equal to The valence of metal M.
- the cyclopentadiene type ligand may be unsubstituted or substituted with any combination of substituents R.
- substituents R include: linear or branched alkyl, alkenyl, alkynyl, cycloalkyl, aryl, acyl, aroyl, alkoxy, aryloxy, alkylthio, dialkyl Amino, alkoxycarbonyl, aryloxycarbonyl, carbamoyl, alkyl- or dialkyl-aminodecanoyl, acyloxy, acylamino, aroylamino or a combination thereof.
- the substituent R has 1 to 30 carbon atoms and can be substituted by a halogen or a hetero atom or the like.
- Non-limiting examples of the hydrocarbyl substituent R include methyl, ethyl, propyl, butyl, pentyl, hexyl, cyclopentyl, cyclohexyl, benzyl and phenyl, etc., including all their isomers, for example Tert-butyl, isopropyl and the like.
- substituent R include fluoromethyl, trifluoromethyl, fluoroethyl, difluoroethyl, trifluoroethyl, iodopropyl, bromoethyl, bromohexyl, chlorobenzyl; hydrocarbyl substituted Organometalloid groups such as trimethylsilyl sulfonyl, trimethylmethanyl and decyldiethylsilyl; halogenated alkyl substituted organometalloid groups such as tris(trifluoromethyl)anthracene Silyl group, methyl bis(difluoromethyl)silyl fluorenyl group, bromomethyl dimethyl carboxymethyl group, etc.; disubstituted borane group such as dimethyl boron group; disubstituted phosphorus group element Such as dinonylamino, dimethylphosphino, diphenylamino, di
- At least two R groups may be joined to form 3 to 30 groups selected from the group consisting of carbon, nitrogen, oxygen, phosphorus, silicon, germanium, aluminum, boron, or combinations thereof.
- the ring structure of an atom may be selected from the group consisting of carbon, nitrogen, oxygen, phosphorus, silicon, germanium, aluminum, boron, or combinations thereof.
- bridging groups include divalent bridging groups containing at least one 13-16 group atom such as, but not limited to, carbon, oxygen, nitrogen, silicon, aluminum, boron, antimony, and tin atoms. At least one of them or a combination thereof.
- the bridging group contains a carbon, silicon or germanium atom, and most preferably, the bridging group contains at least one silicon atom or at least one carbon atom.
- the bridging group may further contain a substituent R as defined above, including a halogen.
- Non-limiting examples of bridging groups include R' 2 C , R' 2 CCR' 2 , R' 2 S i, R' 2 SiCR' 2 , R' 2 S iS iR' 2 , R' 2 Ge, R 'P, R'N, R'B, wherein R' is independently hydrogen, hydrocarbyl, substituted hydrocarbyl, hydrocarbyl-substituted organometalloid, 3 ⁇ 4 alkyl substituted organometalloid, disubstituted borane a group, a disubstituted phosphorus atom group, a substituted chalcogen group or a halogen, or two or more R' may be bonded to form a ring or a ring system.
- the metallocene compound useful in the present invention can be represented by the following formula (I I ):
- J is bonded to M, which is a heteroatom auxiliary ligand; L is a bridging group, bonded to J and Cp; n is an integer of 0 , 1 or 2.
- J is a hetero atom-containing ligand.
- J contains a nitrogen, phosphorus, oxygen or sulfur atom, with nitrogen being most preferred.
- metallocene compounds include, but are not limited to, dicyclopentadienyl zirconium dichloride, dicyclopentadienyl dichloride dichloride, di(methylcyclopentadienyl) zirconium dichloride, Di(methylcyclopentadienyl) ruthenium chloride, bis(butylcyclopentadienyl)zirconium dichloride, di(butylcyclopentadienyl) dichloride, di(propyl) dichloride Cyclopentadienyl)zirconium, bis(propylcyclopentadienyl) ruthenium dichloride, dimercapto.bis(cyclopentadienyl) ruthenium, dimethyl.bis(cyclopentadiene) Zirconium, dihydroethylene bis(tetrahydroindenyl) zirconium, dihydroethylene bis(tetrahydroindenyl) ruthenium, diin
- Aluminoxanes can be used as activators for metallocene compounds.
- Aluminoxanes are generally linear or cyclic oligomeric compounds containing -A1 (I-0-subunits), wherein ⁇ is ( ⁇ -( 3 . alkyl, such as decyl, ethyl, propyl, butyl, pentyl) Base, hexyl, heptyl, octyl, decyl and decyl.
- aluminoxanes examples include mercaptoaluminoxane (MA0), modified mercaptoaluminoxane (MMA0), ethylaluminoxane and isobutylene Alkyl aluminoxanes Alkyl aluminoxanes and modified alkyl aluminoxanes are suitable as activators for metallocene catalyst compounds, especially when the abstractable ligand is a metal, alkoxy or amino group. a mixture of oxane and modified aluminoxane.
- Aluminoxanes can be prepared by hydrolysis of the corresponding trialkyl aluminum compounds.
- AO can be prepared by hydrolysis of trimethylaluminum and higher trialkylaluminum compounds such as triisobutylaluminum.
- MMA0 generally has a higher solubility in aliphatic solvents and is more stable during storage.
- Aluminoxanes or modified aluminoxanes can be used at levels commonly employed in the art.
- the molar ratio (A1/M) of the aluminoxane or modified aluminoxane to the metallocene compound is in the range of from 1 to 1000, preferably in the range of from 10 to 500, more preferably in the range of from 20 to 200. .
- Neutral or ionic ionizing or stoichiometric activators such as trisperfluorophenyl boron, trisperfluoronaphthyl boron, tetramethylammonium tetraphenylborate, tetraphenyl may also be used in the present invention.
- Triethylammonium borate tripropylammonium tetraphenylborate, tri(n-butyl)ammonium tetraphenylborate, tri(tert-butyl)ammonium tetraphenylborate, N,N-dimethyltetraphenylborate
- Aniline oxime tetraphenylboronic acid N,N-diethylaniline F, tetraphenylboronic acid N,N-dimethyl
- tetraphenylborate triphenylcarbenium tetraphenylborate, triphenylsulfonium tetraphenylborate, triethylsilane tetraphenylborate ⁇ , phenyl (diazonium) tetraphenylborate, trimethylammonium tetrakis(pentafluorophenyl)borate, triethylammonium tetrakis(pentafluorophenyl)borate, tripropyl tetrakis(pentafluorophenyl)borate Ammonium, tetra(n-butyl)ammonium tetrakis(pentafluorophenyl)borate, tris(sec-butyl)ammonium tetrakis(pentafluorophenyl)borate, four
- -(2,3,4,6-tetrafluorophenyl)boronic acid triphenylsulfonium, tetra-(2,3,4,6-tetrafluorophenyl)boronic acid triethylsulfonium silane, tetra-(2, Benzene (diazo) salt of 3, 4, 6-tetrafluorophenyl)borate, trimethylammonium tetra(perfluoronaphthyl)borate, triethylammonium tetra(perfluoronaphthyl)borate, tetras(perfluoronaphthalene) Triphenylammonium borate, tri-n-butylammonium tetra(perfluoronaphthyl)borate, tri-tert-butylammonium tetra(perfluoronaphthyl)borate, N,N-dimethyltetrakis(perfluoron
- the composite catalyst of the present invention comprises a metallocene catalyst
- the metallocene catalyst is generally supported on an organic or inorganic support as an inner layer catalyst on which a polymer layer is deposited, and a second catalyst is supported in or on the polymer layer.
- the content of the metallocene catalyst may be in the range of 0.01 to 0.1 mmol/g of the carrier, preferably in the range of 0.02 to 0.06 mmol/g of the carrier.
- Non-metallocene single-site catalysts such as non-metallocene pro-transition metal catalysts (including those having amino and/or phenoxy-type ligands) and non-metallocene post-transition metal catalysts (including having diimine or diimine pyridine)
- non-metallocene pro-transition metal catalysts including those having amino and/or phenoxy-type ligands
- non-metallocene post-transition metal catalysts including having diimine or diimine pyridine
- Those of the base ligands are also known in the art, see, for example, International Patent Publication No. WO 96/23010, WO 97/48735, US Patent Nos. 5, 502, 124, 5, 851, 945, 6, 294, 495, and EP- A2-0 816 384, these patents are incorporated herein by reference.
- the non-metallocene single site catalyst can be used in the present invention in a manner known per se. Also, if used, the non-metallocene single site catalyst is typically supported on an organic or inorganic support as an inner layer catalyst onto which a polymer layer is deposited.
- Ziegler-Natta catalysts are well known to those skilled in the art and are described, for example, in Ziegler-Natta Catalysts and Polymerizations, John Boor, Academic Press, New York, 1979, which is incorporated herein by reference.
- Preferred Ziegler-Natta catalyst compounds have the general formula (R0) n MX' 4 , wherein 0 ⁇ n ⁇ 4, R is independently alkyl, cycloalkyl, aryl, and D is 4 - 6 Group transition metals, such as titanium, vanadium or zirconium, X' is chlorine, bromine or iodine.
- Examples of Ziegler-Natta catalyst compounds in which M is titanium include, but are not limited to, titanium tetrachloride, titanium tetrabutoxide, titanium tetradecoxide, titanium tetraethoxide, titanium tetraisopropoxide, Titanium dichlorodiethoxylate, titanium trichloroethoxylate, titanium dichlorodibutoxide, titanium trichloroquinoline.
- the titanium compound forms a complex with the magnesium compound and the optional electron donor.
- the magnesium compound can be expressed by the general formula MgX 2 wherein X independently represents a facial acid; a preferred magnesium compound is magnesium dichloride.
- Electron donor The compound is a compound containing a hetero atom such as an ether, an ester, an amine or the like.
- Non-limiting examples of vanadium catalyst compounds include vanadium oxyhydride, vanadium alkoxides and vanadium alkoxides such as V0C1 3 , V0Cl 2 (0Bu) and VO(OC 2 H 5 ) 3 ; vanadium tetrahalide and Vanadium oxides, such as VC1 4 , VCl 3 (0Bu), VCl 2 (OBu) 2 ; vanadium acetylacetonate, vanadium chloroacetylacetonate, vanadium acetylacetonate and vanadyl chloroacetylacetonate.
- Preferred vanadium catalyst compounds are V0C1 3 , VC1 4 and V0C1 2 - 0R, wherein R is a hydrocarbyl group, preferably d-Ci. An aliphatic or aromatic hydrocarbon group, and vanadium acetylacetonate.
- the content of the Ziegler-Natta catalyst may be from 0.5 to 5% by weight, preferably from 1.0 to 4.0% by weight, more preferably from 1.0 to 3.0% by weight, based on the metal. , based on the total weight of the composite catalyst.
- Ziegler-Natta catalysts generally use an alkyl metal compound as an activator.
- alkyl metal compound include, but are not limited to, an alkyl aluminum compound, an alkyl lithium compound, a dialkyl zinc compound, an alkyl boron compound; preferably an alkyl aluminum compound, more preferably triethyl aluminum , triisobutyl aluminum and tri-n-hexyl aluminum.
- chromium-based catalyst also known as a Phillips catalyst.
- Common chromium catalyst compounds include, for example, CrO 3 , chromocene, silyl succinate, chromic chloride, chromium 2-ethylhexanoate, chromium acetylacetonate, and the like.
- Non-limiting examples are disclosed in, for example, U.S. Patent Nos. 3,709,853, 3, 709, 954, 3, 231, 550, 3, 242, 0, and 4, 077, 904.
- Chromium-based catalysts are well known to those skilled in the art, and a variety of commercial products are commercially available.
- a supported chromium catalyst supported on a silica support may be used, which may comprise from 0.05 to 5% by weight, preferably from 0.5 to 2% by weight, based on the weight of the supported chromium catalyst.
- the pore volume of the silica gel support measured by a nitrogen gas adsorption method is generally greater than 1.0 cc/g, preferably greater than 1.6 cc/g, more preferably greater than 1.8 cc/g, and particularly preferably greater than 2.0 cc/g.
- the BET specific surface area of the silica gel carrier is generally up to Less than 50 m 2 /g, preferably at least 100 mVg, more preferably at least 200 m7 g, still more preferably at least 350 m7 g, particularly preferably more than 400 m7 g.
- a chromium oxide catalyst prepared as follows is used: a silica support loaded with an organic chromium compound is introduced into an activation furnace, and the temperature is raised to 100-150" C under a nitrogen atmosphere at a constant temperature of 2 to 6 hours. 5-50 ⁇ , ⁇ 4-6 ⁇ , to organic chromium, the temperature is further increased to 400-900" C, preferably 500-850 ⁇ , and the dry air is continuously introduced into the activation furnace 0. 5-50 hours, preferably 4-6 hours, to the organic chromium The compound is oxidized to a hexavalent chromium oxide bonded to the surface of the silica support by a chemical bond to form a chromium oxide catalyst. The temperature of the chromium oxide catalyst is lowered to ambient temperature and then used to deposit a polymer layer.
- a chromium oxide-fluorine catalyst prepared as follows is used: a silica support loaded with an organochromium compound is introduced into an activation furnace. The temperature of the activation furnace was raised to 100- under a nitrogen atmosphere and kept at a constant temperature for 2-6 hours. Then, 5% to 5% by weight, preferably 0. 5-1.5% by weight of a fluoride, such as ammonium tetrafluoroborate, ammonium fluoride or ammonium hexafluorosilicate, preferably ammonium hexafluorosilicate. At the stated temperature, the fluoride decomposes into hydrofluoric acid.
- a fluoride such as ammonium tetrafluoroborate, ammonium fluoride or ammonium hexafluorosilicate, preferably ammonium hexafluorosilicate.
- hydrofluoric acids chemically react with hydroxyl groups on the surface of the silica support to form supported fluorides.
- the temperature is further increased to 400-900 Torr, preferably 500-850 TC, and the dry air is continuously introduced into the activation furnace for 0.5 to 50 hours, preferably 4 to 6 hours, to prepare a chromium oxide-fluorine catalyst.
- the chromium oxide-fluorine catalyst temperature is lowered to ambient temperature and then used to deposit a polymer layer.
- a chromium oxide-titanium catalyst prepared as follows is used: a silica support loaded with an organic chromium compound is introduced into an activation furnace, and the temperature is raised to 100-150 under a nitrogen atmosphere and thermostatically 2- After 6 hours, the free water was removed by drying. The solid is then cooled to ambient temperature and transferred to a vessel where it is mixed with the titanium compound in an alkane solvent.
- the titanium compound is, for example, titanium tetrachloride, titanium tetradecoxide, titanium tetraethoxide, titanium tetraisopropoxide, titanium tetrabutoxide or the like, preferably It is titanium tetraisopropoxide in an amount of from 1 to 7% by weight, preferably from 3 to 5% by weight, based on the weight of the silica gel carrier. 5-50.
- the heat is continuously introduced into the activation furnace.
- the oven is ventilated to the oven.
- a chromium oxide-titanium catalyst is prepared in an hour, preferably 4-6 hours. The temperature of the chromium oxide-titanium catalyst is lowered to ambient temperature and then used to deposit a polymer layer.
- a chromium oxide-titanium-fluorine catalyst prepared as follows is used: a silica support loaded with a titanium compound and an organic chromium compound prepared as described above is added to an activation furnace, and then added to the silica gel. ⁇ The carrier weight 0. l-3wt%, preferably 0. 5-1. 5 wt of ammonium tetrafluoroborate, ammonium fluoride or ammonium hexafluorosilicate.
- the temperature is raised to 400-900, preferably 500-850, and dry air is continuously introduced into the activation furnace for 0.5 to 50 hours, preferably 4 to 6 hours, to prepare a chromium oxide-titanium-fluorine catalyst.
- the temperature of the chromium oxide-titanium-fluorine catalyst is lowered to ambient temperature and then used to deposit a polymer layer.
- a chromium catalyst prepared as follows is used: the above chromium oxide catalyst is further heated to 100-500 under a nitrogen atmosphere, and then a reducing agent is added to reduce the hexavalent chromium to divalent chromium.
- suitable reducing agents include hydrogen, carbon monoxide, diolefins, cyclic olefins, and the like, preferably carbon monoxide.
- the temperature is preferably in the range of from 100 to 300 Torr; for carbon monoxide, the temperature is preferably in the range of from 450 to 500.
- the concentration of the reducing agent in nitrogen is generally 6-10 ° /.
- the reduction time is usually 1-6 hours.
- the completion of the reduction reaction can be indicated by a change in the color of the catalyst:
- the color of the catalyst loaded with hexavalent chromium is orange, which turns blue or gray after completion of the reduction reaction.
- the temperature of the divalent chromium-containing catalyst is lowered to ambient temperature and then used to deposit a polymer layer.
- a polymer layer in the present invention isolates two or more catalysts, particularly catalysts that are not desired to contact each other.
- Suitable polymeric materials are polymers of a certain polarity, or polymers containing polar functional groups such as, but not limited to, hydroxyl (-0H), carboxyl (-C00H), amino (-Li 2 ), carbonyl (- C0-), nitrile group (_CN), halogen (-X), ether group (-0-), imino group (-NH-), ester group (-C00-), amide group (-C0-NH-), Imidyl group (-C0-NH-CO-), -S0-S0 2 -, -0-CO-O-, and the like.
- polymeric material examples include, but are not limited to, regenerated cellulose, nitrocellulose, cellulose acetate, ethyl cellulose, bisphenol polysulfone, polyaryl ether sulfone, phenolphthalein polyether sulfone, polyether ketone, Aliphatic polyamide, polysulfone amide, aliphatic diacid polyimide, wholly aromatic polyimide, polystyrene and styrene copolymer, fluorine-containing polyimide, polyester, polyethylene copolymer, poly Propylene copolymer, poly 4-mercapto-1-pentene copolymer, polyacrylonitrile, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polydimethylsiloxane, polytrimethylsilylpropyne, Polytetrafluoroethylene, polyvinylidene fluoride; preferred are polystyrene and styrene copolymers.
- the polymer material in the composite catalyst of the present invention may be included in an amount of from about 1 to about 50% by weight, preferably from about 10 to about 45% by weight, more preferably from about 15 to about 40% by weight based on the total weight of the composite catalyst.
- the proportion of each catalyst component in the composite catalyst of the present invention is selected such that the resulting composite catalyst, when used in the polymerization of ethylene, gives from about 20 to about 1,000, preferably from about 30 to about 800, more A melt flow ratio MFR (MI / HLMI) of polyethylene of from about 40 to about 600 is preferred.
- the composite catalyst of the invention consists essentially of the following components and, according to a more preferred embodiment, consists of: (a) supported on an inorganic porous support, preferably silica. Metallocene catalyst;
- the composite catalyst of the present invention is substantially The lower component composition, and according to a more preferred embodiment, consists of the following components:
- the composite catalyst of the present invention consists essentially of the following components and, according to a more preferred embodiment, consists of: (a) supported on an inorganic porous support such as silica or activated magnesium chloride. a first Ziegler-Natta catalyst on the support;
- the present invention provides a process for preparing a composite catalyst of the present invention.
- the process for preparing the composite catalyst of the present invention comprises:
- the first catalyst supported on the support can be provided by any of the methods known in the art.
- a metallocene catalyst or a non-metallocene single site catalyst supported on a silica support can be obtained as the first catalyst by a method known in the art.
- the metallocene catalyst supported on the silica support can be prepared by adding a silica carrier to the reactor and then adding a solvent such as hexane or 8-12 ml per gram of the support. Toluene. After the resulting mixture was stirred at 40-45 X for 10 minutes, the desired amount of alkyl aluminoxane was added in the desired molar ratio of the aluminum/metallocene catalyst compound, and the resulting mixture was stirred at 40-45 °C. 2 hours. The desired amount of metallocene catalyst compound is then added and the reaction mixture is stirred at 40-45 for 2-8 hours, preferably 4-6 hours.
- a solvent such as hexane or 8-12 ml per gram of the support.
- Toluene After the resulting mixture was stirred at 40-45 X for 10 minutes, the desired amount of alkyl aluminoxane was added in the desired molar ratio of the aluminum/metallocene catalyst compound, and the
- the molar ratio of the aluminoxane to the metallocene compound (based on the metal element) is in the range of 1000: 1-1 : 1, preferably 500: 1-10: 1, more preferably 200: 1-20: 1.
- the silica support which can be used to support the metallocene catalyst or the non-metallocene single site catalyst generally has an average particle diameter of 5 to 100 ⁇ m, preferably 10 to 80 ⁇ m, more preferably 10 to 50 ⁇ m; and the BET specific surface area is generally 5 to 500 m 7 g. 5 ⁇
- the average pore diameter is 3A, preferably 50-450m7g, more preferably 200-400m7g; a pore volume of 0. l-4cc / g, preferably 0. 5-3. 5cc / g, more preferably 1. 0- 1. 8cc / g; -2000 A, preferably 5-? ⁇ ⁇ ⁇ , more preferably 10-600 A.
- the silica support is generally subjected to an activation treatment prior to use by adding silica to the activation furnace under a nitrogen stream at 200-1000 Torr, preferably 300-800, more preferably 500-750, particularly preferably The heat treatment at 600-700 ° C for 2-10 hours, preferably 3-7 hours, more preferably 4-5 hours, to reduce the hydroxyl content on the surface of the silica particles to 0. 5-0. 7mmo l /g, then Cool down to ambient temperature. 2 ⁇ / ⁇ Further, the hydroxy group content on the surface of the silica is further reduced to 0 to about 0. 2mmol / g.
- the activated silica is stored under an inert atmosphere such as nitrogen.
- a supported Ziegler-Natta catalyst can be provided as the first catalyst in the composite catalyst of the present invention by methods known in the art.
- a chromium-based catalyst can be provided as the first catalyst in the composite catalyst of the present invention by methods known in the art.
- methods known in the art In the foregoing discussion of the first aspect of the invention, several methods of preparing a chromium-based catalyst supported on a silica support are mentioned.
- a polymer layer can be deposited on the first catalyst by a precipitation adsorption process.
- the polymeric material used to form the polymeric layer is as previously described.
- the polymers is dissolved in a good solvent to form a solution, and the solution is combined with the first catalyst to obtain a mixture; then a non-solvent of the polymer is introduced into the mixture, A polymer is deposited on the first catalyst.
- good solvent refers to a solvent capable of dissolving the polymer material well, for example, a solvent capable of dissolving at least lg, preferably at least 2 g, more preferably at least 5 g of the polymer per 100 ml at the operating temperature.
- suitable good solvents include, but are not limited to, n-hexane, cyclohexane, benzene, toluene, xylene, carbon tetrachloride, ethyl acetate, methyl ethyl ketone, dichloroethane, chloroform, chlorobenzene, acetone.
- cyclohexanone tetrahydrofuran (THF)
- carbon disulfide pyridine, 1, 4-dioxane, dibutyl phthalate, N,N-dimercaptoamide, methanol, ethanol, n-butanol, Acetic acid, formic acid, cresol, phenol, etc.; preferred are n-hexane, cyclohexane, benzene, toluene, dinonylbenzene, and more preferred are benzene, toluene, and diphenylene. ,
- non-solvent is used to mean that the solvent is substantially insoluble. Ig of the polymer of the solvent is 0. 2g, more preferably less than 0.1 g.
- suitable non-solvents include, but are not limited to, ethane, propane, butane, isobutane, pentane, isopentane, hexane, cyclohexane, heptane, etc., preferably pentane, isopentane, Hexane, cyclohexane.
- the polymeric material is first heated to 80-100 under an inert atmosphere and vacuum dried until the water content is less than 100 ppm, preferably less than 10 ppm, more preferably less than 1 ppm, and then cooled to ambient temperature.
- the polymer material is then completely dissolved in a good solvent under an inert atmosphere to form a solution.
- the concentration of the polymer material in the solution may be from 0.5 to 50 °/owt, preferably from 1 to 40% by weight, more preferably from 5 to 30% by weight. 5 ⁇
- the good content of the water is less than, for example, 0. 5ppm.
- the combination of the polymer solution and the supported first catalyst is generally carried out under an inert atmosphere and at ambient temperature, and the resulting mixture is generally further stirred for 10 minutes to 2 hours, preferably 30 to 60 minutes.
- the polymer solution sufficiently wets the first catalyst.
- the introduction of the non-solvent into the mixture of the supported first catalyst and the polymer solution is generally carried out under stirring at room temperature. Of course, higher and lower temperatures are also possible. As the amount of non-solvent introduced increases, the polymer material will gradually precipitate. Since the supported first catalyst particles have a certain polar adsorption effect, these gradually precipitated polymer material molecules are adsorbed on the surface of the particles of the negative-load type first catalyst to form a polymer layer.
- the polymer material may be deposited on the surface of the particles of the supported first catalyst.
- the rate of addition of the non-solvent should be controlled such that the non-solvent is added over a period of from about 5 minutes to about 20 hours, preferably from about 10 minutes to about 15 hours, more preferably from about 20 minutes to about 10 hours. If adding speed Too fast, the polymer material may precipitate rapidly and agglomerate and cannot be adsorbed on the first catalyst particles. If the addition speed is too slow, it is not good for productivity.
- anchoring agent examples include an alkyl aluminum compound, an alkyl lithium compound, an alkyl zinc compound, and an alkyl boron compound.
- the introduction of the anchoring agent contributes to the subsequent loading of the second catalyst.
- the second catalyst can then be supported onto the polymer layer deposited on the first catalyst by any suitable means for loading the selected second catalyst onto the support.
- the second catalyst may be supported on the polymer layer deposited on the first catalyst by a dipping method. Methods suitable for supporting the various catalysts useful in the present invention on a support are well known to those skilled in the art.
- the Ziegler-Natta catalyst can be supported on a polymer layer deposited on a first catalyst such as a supported metallocene catalyst or a non-metallocene single-site catalyst or a chromium-based catalyst by: A first catalyst on which a polymer is deposited and a non-solvent of a certain amount of the polymer are added to the reaction flask, and the temperature of the internal material is lowered to 30 Torr or less, preferably 20 or less, more preferably 10 or less under stirring. ⁇ 1. 0-4. 0 ⁇ %, ⁇ 1. 1. 0-3. 0% by weight, based on the total weight of the polymer and the first catalyst.
- a first catalyst such as a supported metallocene catalyst or a non-metallocene single-site catalyst or a chromium-based catalyst by:
- a first catalyst on which a polymer is deposited and a non-solvent of a certain amount of the polymer are added to the reaction flask, and the temperature of the internal material is
- the reaction mixture is then stirred at the temperature for 1-6 hours, preferably 2-4 hours. After the reaction was completed, the supernatant was removed, and the solid residue was washed several times with the non-solvent.
- the solid catalyst in the reaction flask is subjected to a nitrogen purge or drying in a vacuum at a temperature of 20 to 120 Torr, preferably 20 to 80, more preferably 20 to 4 to obtain a free-flowing solid powder, thereby forming a composite catalyst of the present invention.
- the Ziegler-Natta catalyst can be supported on a polymer layer deposited on a first catalyst such as a supported metallocene catalyst or a non-metallocene single-site catalyst or a chromium-based catalyst by the following method.
- the first catalyst on which the polymer is deposited and a certain amount of the non-solvent of the polymer are added to the reaction flask, and the temperature of the internal material is lowered to below with stirring, preferably 20 ⁇ or less, more preferably 10 or less.
- the weight of the titanium oxide or the vanadium tetrachloride is 0. 5-5 wt%, preferably 1. 0-4. 0 weight %, more preferably 1. 0-3. 0% by weight, based on the total weight of the polymer and the first catalyst.
- a magnesium compound of the formula RMgX is added together with the titanium tetrachloride or vanadium tetrachloride, wherein R is d-C 2 .
- the alkyl, cycloalkyl or aryl, X is chlorine, bromine or iodine; the molar ratio of the magnesium compound to titanium tetrachloride or vanadium tetrachloride is 0. 1-10, preferably 1-5.
- the reaction mixture is then stirred at the temperature for 1-6 hours, preferably 2-4 hours. After the reaction was completed, the supernatant was removed, and the solid residue was washed several times with the non-solvent.
- the solid matter in the reaction flask is dried at a temperature of 20-120 Torr, preferably 20-80 Torr, more preferably 20-40 Torr: by nitrogen purge or vacuum drying until a free-flowing solid powder is obtained, thereby forming the present invention.
- Composite catalyst
- the method of preparing the composite catalyst of the present invention comprises:
- step (iii) introducing a non-solvent of the polymer into the mixture obtained in step (ii), or evaporating a good solvent in the mixture to deposit the polymer and the second catalyst on the load first On the carrier of the catalyst;
- the present invention provides a method of producing polyethylene, the method This includes contacting ethylene and optionally at least one alpha-olefin comonomer with the composite catalyst of the present invention under polymerization conditions.
- the present invention provides a process for preparing a broad molecular weight distribution polyethylene comprising copolymerizing ethylene and at least one alpha-olefin in a single reactor under polymerization conditions.
- the body is contacted with a composite catalyst of the present invention in which the first catalyst and the second catalyst are different.
- the method of producing polyethylene of the present invention comprises:
- the method of the invention for preparing a broad molecular weight distribution of polyethylene comprises:
- the composite catalyst of the present invention such as a metallocene-Ziegler composite catalyst, a chromium oxide-Ziegler composite catalyst or a Ziegler-Ziegler composite catalyst, can be used in a single gas phase reactor or a slurry reactor, or can be used. a series reactor or a parallel connection with different conditions such as polymerization pressure, temperature, hydrogen-ethylene ratio, comonomer-ethylene ratio Reactor to produce polyethylene products. It is advantageous to produce a broad molecular weight distribution polyethylene product in a single reactor, such as a gas phase stirred bed reactor or a fluidized bed reactor, using the composite catalyst of the present invention.
- the reaction pressure may be from 0.5 to 5 MPa, preferably from 1 to 3 MPa; and the reaction temperature may be from 30 to 150 Torr, preferably from 60 to 120 Torr, more preferably from 90 to 110.
- the slurry polymerization process is generally at a pressure of from 0.1 to about 5.
- OMPa or more preferably from about 0.5 MPa to about 2.
- C more preferably operated at a temperature of from about 60 to about.
- a typical gas phase fluidized bed reactor system consists of a recycle gas compressor, a cooler, and a polymerization reactor in which solid particles are maintained in a fluidized state by a passing recycle gas.
- the composite catalyst of the present invention is added to the reactor intermittently or continuously, and the reactant ethylene and optional o-olefin and cocatalyst, molecular weight regulator (preferably hydrogen) are continuously added to the recycle gas, and then reacted.
- the polymerization occurs in the presence of a catalyst to form polyethylene. Unreacted gas exits the top of the reactor, is compressed and cooled, and is recycled back to the reactor or to the flare.
- an alkyl metal compound can be used as a cocatalyst and/or a scavenger.
- the alkyl metal compound include: an alkyl aluminum compound, an alkyl lithium compound, an alkyl zinc compound, an alkyl boron compound, preferably an alkyl aluminum compound, more preferably triethyl aluminum, triisobutyl Base aluminum or tri-n-hexyl aluminum.
- the amount of these metal alkyl compounds can be selected by those skilled in the art based on the second catalyst of the outer layer.
- the molar ratio of the alkyl metal compound to the titanium compound may be in the range of 5:1 to 300:1, preferably 20: Within the range of 1-250:1, more preferably in the range of 40: 1-200:1.
- the composite catalyst of the present invention can be used for homopolymerization of ethylene or ethylene and ⁇ -olefin Copolymerization.
- Suitable o - Examples of olefin comonomers include C "C 2 is o - olefins, such as, but not limited to: propylene, butene - 1, pentene - 1, hexene - 1, octene-1 or higher 0-1. 2, preferably 0. 1-0. 2, 2, preferably 0. 1-0. 2 .
- hydrogen gas can be used as the molecular weight modifier. 5 ⁇
- the molar ratio of the hydrogen and the ethylene may be 0. 01-1. 0, preferably 0. 1-0.
- the high-load flow index can be produced in the range of 0. 925-0. 960g/cm 3 , preferably in the range of 0. 945-0. 960g/cm 3 , by the ethylene polymerization method of the present invention.
- the polymer is in the range of from about 1 to about 200 g/10 min., preferably in the range of from about 2 to about 100 g/l Omin.
- the polymerization process of the present invention can produce polyethylene having a broad molecular weight distribution, and the polyethylene can have a melt flow ratio MFR (MI / HLMI) of from about 20 to about 1,000, preferably from about 30 to about 800, more preferably from about 40 to about 600.
- the metallocene catalyst is the first catalyst coated by the polymer layer, and the Ziegler-Natta catalyst is supported on the polymer layer / a second catalyst in the polymer layer
- a "chromium-Ziegler” composite catalyst wherein the chromium-based catalyst is the first catalyst coated by the polymer layer, and the Ziegler-Natta catalyst is supported on the polymer layer
- the metallocene catalyst covered by the polymer layer cannot or less contact with the a-olefin comonomer and the alkane due to the isolation or hindrance of the polymer layer.
- Base aluminum with preferential contact with ethylene and hydrogen, thus catalyzing the polymerization of ethylene to form less or no comonomer Derivatized units of low molecular weight (LMW) polyethylene, while Ziegler-Natta catalysts catalyze the copolymerization of ethylene and ot-olefins in the presence of sufficient cocatalytic aluminum alkyl to produce high units containing more comonomer derived Molecular weight (HMW) polyethylene.
- LMW low molecular weight
- HMW comonomer derived Molecular weight
- Such broad molecular weight distribution polyethylenes have a combination of desirable physical and mechanical properties.
- the chromium-based catalyst covered by the polymer layer does not contact or less contact with the aluminum alkyl having a larger molecular diameter, and thus is not affected by the aluminum alkyl
- the Ziegler-Natta catalyst can exert polymerization activity in the presence of sufficient promoter.
- a polyethylene resin having a higher bulk density can be produced by isolating the same catalyst with a polymer layer and controlling the activity of the outer layer catalyst to be low.
- controlling the activity of the outer layer catalyst is effective to prevent catalyst particles from breaking during polymerization, resulting in a more regular resin particle having a higher bulk density.
- ASTM D1928 was used to test the density (DE) of the polyethylene resin
- ASTM D1238 is used to test the melt index (Ml, 190 at 2.16 kg load) and flow index (HLMI at 190 kg load, 190); ASTM D638 is used to test the tensile resistance of polyethylene resin strength. The following materials were used in the examples:
- Silica gel XOP2485 (Grace) with an average particle size of 25 ⁇ m, activated as follows: Add about 350 g of silica gel to a 50 mm diameter activation furnace, and raise the temperature of the activation furnace at a gas flow rate of 0.11 m/s. After 120 hours, after 2 hours of constant temperature, heat up to 600 at 50 / hour, hold at this temperature for 4 hours, then cool to ambient temperature.
- the treated silica gel has a surface hydroxyl group content of between 0.5 and 0.7 mmol/g. Stored in a dry bottle under nitrogen for the preparation of a composite catalyst;
- Silica gel X0P2212 (Grace Corporation) having an average particle size of 12 ⁇ m, which has been subjected to high temperature de-surface hydroxyl treatment by the manufacturer.
- the silica gel was further activated as follows before adding: about 200 g of silica gel was added to a 50 mm diameter activation furnace, and the temperature of the activation furnace was raised to 120 Torr under a nitrogen gas flow rate of 0.06 m/s, and the temperature was maintained for 4 hours to remove free moisture. Then cool down to ambient temperature. It was stored in a dry bottle under nitrogen for the preparation of a composite catalyst.
- Styrene-acrylic acid copolymer obtained from Jilin City Pengli Technology Development Co., Ltd., copolymer - C00H content 3mmol / g polymer.
- the toluene solvent was removed under vacuum until the solids became free flowing to obtain a supported metallocene catalyst A supported on a silica gel support.
- the catalyst contained 0.04 mmol Zr/g silica gel and had an Al/Zr ratio of 100.
- the supported metallocene catalysts B and C were prepared in the same manner as above except that activated XOP2485 and X0P2212 silica gel were used instead of silica gel 955.
- the catalyst contained 0.04 mmol Zr/g silica gel and had an AL/Zr ratio of 100.
- Gas phase polymerization Replace the fluidized bed polymerization reactor of ⁇ 76 ⁇ 700 with nitrogen several times, and then recycle the reaction gas (CG) in an industrial unit (molar composition: ethylene 36.6%, 1-butene 16.8%, hydrogen 7.08%, nitrogen 34.1%, inert alkanes 5.42%) kept the reactor flow-exchanged for more than 2 hours.
- the fresh ethylene stream and the butene-1 stream were fed.
- the initial reaction temperature was 88 and the total reaction pressure was 2.2 MPa, among which: the industrial reactor had a partial pressure of 0.02 MPa, a partial pressure of fresh ethylene gas of 1.8 MPa, and a partial pressure of butene -1 of 0.38 MPa.
- the composite catalyst was prepared in the same manner as in Example la except that the amount of the supported metallocene catalyst A was changed to 3.09 g, the amount of the copolymer was changed to 1.3 g, and the amount of the titanium tetrachloride hexane solution was changed to 1.3 ml. , and the amount of monochlorobutylmagnesium heptane solution was changed to 0.7ml 0
- the composite catalyst was prepared in the same manner as in Example la except that the amount of the supported metallocene catalyst A was changed to 2.79 g, and the amount of the copolymer was changed to 1.39 g, tetrachloro 6 ⁇ The amount of the amount of the solution was changed to 0. 6ml.
- the amount of the copolymer is changed to 1. 8g, titanium tetrachloride.
- the amount of the copolymer is changed to 1. 8g, titanium tetrachloride.
- the amount of the copolymer is changed to 1. 8g, titanium tetrachloride. 5 ⁇
- the amount of hexane solution was changed to 1. 5ml, and the amount of chlorobutyl magnesium heptane solution was changed to 0. 75ml.
- the amount of the copolymer is changed to 1. 9g, titanium tetrachloride has been used. The amount of the copolymer is changed to 1. 9g, titanium tetrachloride has been used. The amount of the solution was changed to 1.75 ml, and the amount of the solution of monochlorobutylmagnesium heptane was changed to 0.75 ml.
- a bimetallic catalyst was prepared as follows:
- the metallocene-Ziegler composite catalyst prepared by the process of the present invention gives at least 20% higher activity under the same polymerization conditions as compared with Comparative Example 1, and is produced.
- the polyethylene resin has a yield strength of at least 40% and a melt flow ratio (MFR) of 100 or more.
- the amount of the copolymer was changed to 1. 2 g, the amount of the copolymer was changed to 1. 2 g, and the quinoline tris(8-oxytitanium trichloride) was prepared in the same manner as in Example I. 2 ⁇ The amount of dichlorosilane solution was changed to 2. 2ml.
- the composite catalyst was prepared in the same manner as in Example If the amount of the supported metallocene catalyst A was changed to 2.87 g, and the amount of the polymer material was changed to 1.48 g, methylene chloride of quinoline oxychloride. The amount of the solution was changed to 2 ml.
- the composite catalyst was prepared in the same manner as in Example If except
- the composite catalyst was prepared in the same manner as in Example If except
- a supported Ziegler-Natta catalyst A was prepared by the following method:
- the amount of the copolymer was changed to 1. 036 g, the quinoline trichloride - 8 was prepared in the same manner as in Example 2a, except that the amount of the supported Ziegler-Natta catalyst A was changed to 2.59 g. The amount of the solution of the oxytitanium chloride was changed to 0.85 ml.
- the composite catalyst was prepared in the same manner as in Example 2a, except that the amount of the supported Ziegler-Natta catalyst A was changed to 3.28 g, and the amount of the copolymer was changed to 1.64 g, and quinoline trichloride- 0 ⁇ The amount of the solution of the solution was changed to 1. 0ml.
- the composite catalyst was prepared in the same manner as in Example 2a, except that the load type was The amount of the Gele-Natta catalyst A was changed to 3.54 g, the amount of the copolymer was changed to 1.95 g, and the amount of the dichloromethane solution of quinoline-8-oxytitanium trichloride was changed to 1. Lml.
- the composite catalyst was prepared in the same manner as in Example 2a, except that the amount of the supported Ziegler-Natta catalyst A was changed to 2.54 g, and the amount of the copolymer was changed to 1.52 g, and quinoline trichloride- 8 ⁇ The amount of the solution of 0. 8ml.
- the gas phase polymerization was carried out in the same manner as in Example 2a, using 0.16 g of the above composite catalyst to obtain 550 g of a polymer.
- the calculated catalyst activity and the properties of the polyethylene resin tested according to the above test methods are listed in Table 3.
- the bottles A and B are connected.
- 6 g of the activated silica gel XP0 2485 was added to the preparation bottle A, and purged with nitrogen for 5 minutes.
- isoamethane 30ml in the environment After stirring for a while, a solution of 1.8 ml of TEAL in isopentane (1 M) was added, stirred at ambient temperature for 1 hour, and then isopentane was purged with nitrogen until a free-flowing powder was obtained.
- 0.3 g of a styrene-acrylic acid copolymer was added to the vial B, dried under nitrogen at 80-90 for 6-8 hours, and then cooled to ambient temperature. Under a nitrogen atmosphere, 2.
- a complex of titanium tetrachloride and magnesium dichloride deposited directly on a silica gel support is regarded as an inner layer catalyst supported on titanium tetrachloride and magnesium dichloride on a styrene-acrylic acid copolymer coated with the silica gel support.
- the complex is considered to be an outer catalyst.
- the amount of the solution of the titanium tetrachloride is changed to 0. 8ml, the amount of the solution of the titanium tetrachloride is changed to 0. 8ml, the amount of the solution of the titanium tetrachloride is changed to 0. 8ml , and also used 0. 2g TS-610 silica gel.
- Comparative Example 2 used the supported Ziegler-Natta catalyst A prepared above.
- the polymer was obtained in the same manner as in Example 2a.
- the calculated catalyst activity and the properties of the polyethylene resin tested according to the above test methods are listed in Table 3. table 3
- Example 2a 2b 2c 2d 2e 2f 2g 2h Comparative Example Poly ⁇ Material PVC PVC PVC PVC PS PS PS
- the Ziegler-Ziegler composite catalyst prepared by the method of the present invention has greater activity than Comparative Example 2, and the melt flow ratio of the produced polyethylene is increased by MFR. More than 40%, the yield strength increased by more than 37%. The larger melt flow ratio indicates that the polymer has better processing properties, which facilitates post-processing applications and lowers energy consumption.
- Example 3 Preparation of a chromium-Ziegler composite catalyst:
- a chromium-based catalyst was prepared as follows:
- the commercially available 150 Kg of silica gel 957 (available from Grace, containing 0.5% by weight of Cr, having an average particle diameter of 45 ⁇ m) was placed in an activation furnace, and the temperature of the activation furnace was set at a gas flow rate of 0.24 m/s. Increase to 150 :, constant temperature for 4 hours. Then, the temperature was lowered to ambient temperature, and ammonium hexafluorosilicate (1.5 kg) was added from the top of the furnace, and fluidized and mixed for 1 hour. Then, the temperature in the furnace was raised to 800 Torr at a heating rate of 5 0 ⁇ ⁇ /1 Torr, and dry air was introduced into the activation furnace, and oxidized at 800 ° C for 5 hours. Finally, the temperature of the chromium oxide-fluorine catalyst is lowered to ambient temperature to give a chromium-based catalyst.
- the commercially available 150Kg silica gel MS 3Q5 Q (available from PQ, containing 1.0% by weight of Cr, and an average particle diameter of 90 ⁇ m) was added to the activation furnace and activated at a gas flow rate of 0.24 m/s.
- the furnace temperature was raised to 150 ⁇ and the temperature was kept for 4 hours. It is then cooled to ambient temperature to give a chromium based catalyst.
- the solid residue was washed with 30 ml of x 3 hexane and dried at 75 X under a stream of nitrogen to remove Hexane until a pale yellow, free-flowing solid is obtained.
- the temperature inside the bottle was lowered to 10 C, 20 ml of isopentane was added, and the mixture was stirred for 30 minutes.
- 0.5 ml of a solution of monochlorobutylmagnesium heptane (2M) was slowly added thereto, and the mixture was stirred for 30 minutes, and then 1 ml of a solution of titanium tetrachloride in hexane (1 M) was added dropwise thereto, and the mixture was stirred for 60 minutes.
- Gas phase polymerization Displacement of the ⁇ 76 700mm fluidized bed polymerization reactor with nitrogen three times, and then use the circulating reaction gas in the industrial unit (molar composition: ethylene 37.6%, 1-butene 15.5%, hydrogen 4.7%, nitrogen 35.5) %, inert alkane 6.7%) was displaced by reactor flow for 2 hours. A fresh ethylene stream and a hydrogen stream are then added.
- the initial reaction temperature is 95 and the total reaction pressure is 2.0 MPa, wherein: the partial pressure of the circulating gas is 0.5 MPa, the partial pressure of fresh ethylene gas is 1.2 MPa, and the partial pressure of hydrogen is 0.3 MPa.
- the concentration of triethyl aluminum in the reactor was controlled to be 80 ppm.
- a composite catalyst was prepared in the same manner as in Example 3a except that the amount of the copolymer was changed to 1.0 g.
- Example 3c 5 ⁇ The amount of the copolymer was changed to 1. 5g.
- the composite catalyst was prepared in the same manner as in Example 3a except that the same weight of the chromium-based catalyst B was used instead of the chromium-based catalyst A.
- the composite catalyst was prepared in the same manner as in Example 3a except that the same weight of the chromium-based catalyst B was used instead of the chromium-based catalyst A, and the amount of the copolymer was changed to 1.0 g.
- a composite catalyst was prepared in the same manner as in Example 3a except that the same weight of the chromium-based catalyst B was used instead of the chromium-based catalyst A, and the amount of the polymer material was changed to 1.5 g.
- the chromium-Ziegler composite catalyst prepared by the method of the present invention can produce polyethylene having a relatively large melt flow ratio MFR and a large yield strength.
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Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/593,239 US8536286B2 (en) | 2007-03-28 | 2008-03-28 | Composite catalyst for production of polyethylene |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100918776A CN101274968B (zh) | 2007-03-28 | 2007-03-28 | 一种用于生产宽分子量分布的聚乙烯的复合催化剂 |
| CN200710091877.6 | 2007-03-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2008116396A1 true WO2008116396A1 (en) | 2008-10-02 |
Family
ID=39788048
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CN2008/000625 Ceased WO2008116396A1 (en) | 2007-03-28 | 2008-03-28 | Composite catalyst for production of polyethylene |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US8536286B2 (zh) |
| CN (1) | CN101274968B (zh) |
| RU (1) | RU2466145C2 (zh) |
| SA (1) | SA08290183B1 (zh) |
| WO (1) | WO2008116396A1 (zh) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104558348A (zh) * | 2013-10-15 | 2015-04-29 | 中国石油化工股份有限公司 | 一种乙烯/1-丁烯/1-己烯的三元共聚物及其制备方法及由其制备的复合材料 |
| CN107722146A (zh) * | 2013-02-08 | 2018-02-23 | 三井化学株式会社 | 固体状聚铝氧烷组合物的制造方法 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008051824A2 (en) * | 2006-10-23 | 2008-05-02 | Dow Global Technologies Inc. | Polyethylene compositions, methods of making the same, and articles prepared therefrom |
| CN102030846B (zh) * | 2009-09-29 | 2012-06-13 | 中国石油化工股份有限公司 | 一种能制备高熔融流动比聚乙烯的催化剂及其制备方法 |
| CN102172520B (zh) * | 2010-12-31 | 2012-10-10 | 陕西师范大学 | 硅胶表面周期性氧化锆-氧化硅复合材料的制备方法 |
| CN102504058B (zh) * | 2011-11-10 | 2014-04-02 | 上海化工研究院 | 用于生产宽分子量分布聚乙烯的复合催化剂及制法和应用 |
| WO2013186025A1 (en) * | 2012-06-14 | 2013-12-19 | Saudi Basic Industries Corporation | Gas phase polymerisation of ethylene |
| CN103665567B (zh) * | 2012-09-04 | 2015-09-16 | 中国石油化工股份有限公司 | 丙烯丁烯共聚物发泡珠粒及其制备方法 |
| CN103665211B (zh) * | 2012-09-20 | 2016-03-16 | 中国石油化工股份有限公司 | 一种用于生产高熔体强度聚丙烯的负载型复合催化剂 |
| CN104448066B (zh) * | 2014-12-16 | 2017-07-07 | 华东理工大学 | 一种负载型多金属烯烃聚合催化剂及其制备方法与应用 |
| KR101850985B1 (ko) * | 2015-06-15 | 2018-04-20 | 주식회사 엘지화학 | 메탈로센 담지 촉매의 제조 방법 |
| CN115141300A (zh) | 2015-07-08 | 2022-10-04 | 切弗朗菲利浦化学公司 | 乙烯共聚物和包含其的制品 |
| US9758599B2 (en) | 2015-09-24 | 2017-09-12 | Chevron Phillips Chemical Company Lp | Heterogeneous Ziegler-Natta catalysts with fluorided silica-coated alumina |
| US9845367B2 (en) | 2015-09-24 | 2017-12-19 | Chevron Phillips Chemical Company Lp | Heterogeneous Ziegler-Natta catalysts with fluorided silica-coated alumina |
| US9540457B1 (en) | 2015-09-24 | 2017-01-10 | Chevron Phillips Chemical Company Lp | Ziegler-natta—metallocene dual catalyst systems with activator-supports |
| CN106554440A (zh) * | 2015-09-30 | 2017-04-05 | 中国石油化工股份有限公司 | 用于制备聚乙烯树脂的催化剂及其制备的聚乙烯树脂 |
| CN105749906B (zh) * | 2016-02-26 | 2018-01-09 | 济南大学 | 一种以阳离子型聚合物为中间体的银负载漂浮空心二氧化钛的制备方法 |
| CN108864339B (zh) * | 2018-04-18 | 2021-03-05 | 上海拜乐新材料科技有限公司 | 一种金属茂化合物和一种烯烃聚合催化剂及其应用 |
| US11186656B2 (en) | 2019-05-24 | 2021-11-30 | Chevron Phillips Chemical Company Lp | Preparation of large pore silicas and uses thereof in chromium catalysts for olefin polymerization |
| CN116474758B (zh) * | 2023-05-09 | 2023-12-26 | 大连万慷工业科技有限公司 | 一种用于辛醇脱水制备1-辛烯的催化剂及制备方法和用途 |
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- 2007-03-28 CN CN2007100918776A patent/CN101274968B/zh active Active
-
2008
- 2008-03-28 US US12/593,239 patent/US8536286B2/en active Active
- 2008-03-28 WO PCT/CN2008/000625 patent/WO2008116396A1/zh not_active Ceased
- 2008-03-28 RU RU2009139663/04A patent/RU2466145C2/ru active
- 2008-03-29 SA SA8290183A patent/SA08290183B1/ar unknown
Patent Citations (3)
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| CN1086223A (zh) * | 1992-10-23 | 1994-05-04 | 菲利浦石油公司 | 烯烃聚合反应催化剂及其用途 |
| CN1112131A (zh) * | 1994-03-23 | 1995-11-22 | 埃勒夫阿托化学有限公司 | 烯烃聚合用催化组分及用于它的预聚物 |
| CN1148048A (zh) * | 1995-09-19 | 1997-04-23 | 埃勒夫阿托化学有限公司 | 组合多种固体催化组分的烯烃聚合预聚物 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107722146A (zh) * | 2013-02-08 | 2018-02-23 | 三井化学株式会社 | 固体状聚铝氧烷组合物的制造方法 |
| CN107722146B (zh) * | 2013-02-08 | 2021-02-26 | 三井化学株式会社 | 固体状聚铝氧烷组合物的制造方法 |
| CN104558348A (zh) * | 2013-10-15 | 2015-04-29 | 中国石油化工股份有限公司 | 一种乙烯/1-丁烯/1-己烯的三元共聚物及其制备方法及由其制备的复合材料 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101274968A (zh) | 2008-10-01 |
| US20100152397A1 (en) | 2010-06-17 |
| US8536286B2 (en) | 2013-09-17 |
| RU2466145C2 (ru) | 2012-11-10 |
| SA08290183B1 (ar) | 2013-12-24 |
| RU2009139663A (ru) | 2011-05-10 |
| CN101274968B (zh) | 2012-11-21 |
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