CN113333018A - Preparation method and application of supported catalyst for preparing halogenated styrene - Google Patents

Preparation method and application of supported catalyst for preparing halogenated styrene Download PDF

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CN113333018A
CN113333018A CN202110710271.6A CN202110710271A CN113333018A CN 113333018 A CN113333018 A CN 113333018A CN 202110710271 A CN202110710271 A CN 202110710271A CN 113333018 A CN113333018 A CN 113333018A
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supported catalyst
catalyst
halogenated
halogenated styrene
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王蕊
王庆吉
李进
王炳春
王贤彬
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China Catalyst New Material Co ltd
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    • B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/14—Phosphorus; Compounds thereof
    • B01J27/16—Phosphorus; Compounds thereof containing oxygen, i.e. acids, anhydrides and their derivates with N, S, B or halogens without carriers or on carriers based on C, Si, Al or Zr; also salts of Si, Al and Zr
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    • B01J29/00—Catalysts comprising molecular sieves
    • B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/70—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65
    • B01J29/7007—Zeolite Beta
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    • B01J29/00—Catalysts comprising molecular sieves
    • B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/70—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65
    • B01J29/7049—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 containing rare earth elements, titanium, zirconium, hafnium, zinc, cadmium, mercury, gallium, indium, thallium, tin or lead
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    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
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    • B01J37/082—Decomposition and pyrolysis
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    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B39/00—Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
    • C01B39/02—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
    • C01B39/04—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof using at least one organic template directing agent, e.g. an ionic quaternary ammonium compound or an aminated compound
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C17/00—Preparation of halogenated hydrocarbons
    • C07C17/35—Preparation of halogenated hydrocarbons by reactions not affecting the number of carbon or of halogen atoms in the reaction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
    • B01J2229/10—After treatment, characterised by the effect to be obtained
    • B01J2229/18—After treatment, characterised by the effect to be obtained to introduce other elements into or onto the molecular sieve itself

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Abstract

The invention provides a preparation method and application of a supported catalyst for preparing halogenated styrene, belonging to the technical field of catalyst processing. Firstly, preparing a phosphorus source into a solution, and then adding a molecular sieve carrier; and aging, drying and roasting to obtain the supported catalyst. The supported catalyst is filled in a fixed bed and used for preparing halogenated styrene by dehydrating halogenated phenethyl alcohol, and the reaction polymerization condition can be reduced, so that the conversion rate and the selectivity of the reaction are improved. The catalyst has the advantages of simple synthesis process, high conversion rate of halogenated phenethyl alcohol and high selectivity and yield of halogenated styrene.

Description

Preparation method and application of supported catalyst for preparing halogenated styrene
Technical Field
The invention belongs to the technical field of catalyst processing, and particularly relates to a preparation method and application of a catalyst for preparing halogenated styrene.
Background
Halogenated styrene comprises chlorostyrene, bromostyrene and the like, is a combustible and easily polymerizable compound, can be used as a raw material for producing foamed styrene, polyethylene resin and plastic lenses, has C ═ C double bonds, so the halogenated styrene has active chemical properties, is a very important chemical raw material, is easy to polymerize, can be slowly polymerized at room temperature, has wide application, can be applied to various aspects of ion exchange resin, functional polymers, photosensitive polymers, polymer catalysts, medicines, pesticides, chemical engineering fields and the like, and has wide market prospect.
The main raw materials of the existing method for preparing the chlorostyrene comprise chlorobenzaldehyde, chlorphenyl magnesium bromide, chlorobenzyl chloride, chlorobenzene and chlorphenethanol, and Chinese patent CN103936553A discloses a process for synthesizing the parachlorostyrene by the parachlorophenylethanol, wherein an aluminum silicate molecular sieve is adopted for reaction under negative pressure and high temperature, the product purity is 96 percent, but the method has high requirements on reaction equipment and harsh reaction conditions.
Disclosure of Invention
In view of the above, the invention provides a preparation method of a supported catalyst for preparing halogenated styrene, the preparation method is simple and feasible to operate, the prepared catalyst can be recycled, and the reaction polymerization condition is reduced, so that the conversion rate and the selectivity of the reaction are improved.
The preparation method of the supported catalyst for preparing halogenated styrene provided by the invention comprises the following steps:
(1) preparing a phosphorus source into a solution with the mass fraction of 1-5%, and adding a molecular sieve carrier;
(2) and aging for 2-10 h, drying and roasting to obtain the supported catalyst.
Preferably, the molecular sieve carrier in the step (1) is any one of TS-1, Ti-MWW, Ti-MOR, ZSM-5 and Beta molecular sieves.
Preferably, the phosphorus source in step (1) is at least one of phosphoric acid, diammonium hydrogen phosphate, ammonium phosphate.
Preferably, the drying temperature in the step (2) is 80-120 ℃, and the drying time is 4-10 h.
Preferably, the roasting temperature in the step (2) is 250-450 ℃, and the roasting time is 2-6 h.
The supported catalyst for preparing the halogenated styrene prepared by the method comprises a carrier and a supported component, wherein the supported component is calculated by phosphorus pentoxide, and the supported amount is 1-10% of the mass fraction of the catalyst carrier.
The application of the supported catalyst for preparing the halogenated styrene comprises the following steps:
and filling the catalyst in a fixed bed, and carrying out dehydration reaction by using halogenated phenethyl alcohol as a raw material to generate halogenated styrene.
Preferably, the halogenated phenethyl alcohol is any one of p-chlorobenzene ethanol, m-chlorobenzene ethanol, o-chlorobenzene ethanol, p-bromobenzene ethanol, m-bromobenzene ethanol and o-bromobenzene ethanol.
Preferably, the dehydration reaction temperature is 250-330 ℃, the reaction pressure is 0-0.1 MPa, and the space velocity of the halogenated phenethyl alcohol is 0.5-5 h-1。
Preferably, the dehydration reaction temperature is 270-300 ℃, the reaction pressure is 0.02-0.06 MPa, and the space velocity of the halogenated phenethyl alcohol is 1-3h-1。
Under the catalytic action of the catalyst, halogenated styrene is generated by the dehydration reaction of halogenated phenethyl alcohol, and the reaction equation is as follows:
Figure BDA0003133381890000021
x ═ Cl or Br in the above equation.
The content of each component oxide in the catalyst is measured by an X-ray fluorescence spectrum analyzer (Pasnake, X' AXIOSmAX).
The reaction index in the synthesis of halogenated styrene and the calculation mode thereof are as follows:
the conversion X of halogenated phenethyl alcohol is 100% mole of halogenated phenethyl alcohol reacted/total mole of halogenated phenethyl alcohol;
selectivity of halogenated styrene SAlkene(s)The mol number of the halogenated styrene generated in the reaction/the mol number of the halogenated phenethyl alcohol in the reaction is 100 percent;
compared with the prior art, the invention has the following beneficial effects:
the method has the advantages of simple process, convenient operation, recyclable catalyst and cost saving, and the catalyst can be used for catalyzing halogenated phenethyl alcohol to dehydrate and prepare halogenated styrene, so that the energy consumption can be reduced, and the reaction polymerization condition can be reduced, thereby improving the conversion rate and the selectivity of the reaction.
Detailed Description
The invention provides a preparation method of a supported catalyst for preparing halogenated styrene, which is characterized by comprising the following steps:
(1) preparing a phosphorus source into a solution with the mass fraction of 1-5%, and adding a molecular sieve carrier;
(2) and aging for 2-10 h, drying and roasting to obtain the supported catalyst.
The molecular sieve carrier is any one of TS-1, Ti-MWW, Ti-MOR, ZSM-5 and Beta molecular sieves, and the preparation method of the molecular sieve is as follows.
Preparing a titanium silicalite TS-1: taking silica sol (the content of silica is 30 wt%) as a silicon source, tetrabutyl titanate as a titanium source, tetrapropyl ammonium bromide as a template agent, wherein the mass ratio of the silica sol to the tetrabutyl titanate to the tetrapropyl ammonium bromide is 91.5: 4:4.5, crystallizing at 180 ℃ for 30h, filtering, washing, drying and roasting to obtain the raw powder of the titanium silicalite TS-1. And uniformly mixing 100g of raw powder and 2g of sesbania powder, adding 38g of silica sol, further uniformly mixing, extruding and molding by using a strip extruding machine, drying a molded sample at 100 ℃ for 12h, and roasting to obtain the strip-shaped titanium silicalite molecular sieve TS-1.
Preparing a titanium silicalite Ti-MWW: boric acid is used as a boron source, silica sol (the content of silica is 30 wt%) is used as a silicon source, piperidine is used as a template agent, and the mass ratio of the boric acid to the silica sol to the piperidine is 20: 53: 27, crystallizing at 100 ℃ for 30 hours, filtering, washing and drying to obtain B-MWW, treating the B-MWW with nitric acid with the mass fraction of 33% at 120 ℃ for deboronation, performing secondary hydrothermal crystallization by taking tetrabutyl titanate as a titanium source, crystallizing at 160 ℃ for 60 hours, filtering, washing, drying and roasting to obtain raw powder of the Ti-MWW, uniformly mixing 38g of the raw powder and 2g of sesbania powder, adding 38g of silica sol, further uniformly mixing, extruding by using an extruding machine for molding, drying the molded sample at 100 ℃ for 12 hours, and roasting to obtain the strip Ti-MWW.
Preparing a molecular sieve Ti-MOR: MOR (H-type mordenite) is used as a carrier, treated by 30% nitric acid with a solid-to-liquid ratio of 10:1, filtered after being treated for 24 hours at 100 ℃, washed and dried. Titanium tetrachloride is used as a titanium source, gas phase treatment is carried out for 12 hours at 500 ℃, raw powder of a titanium-containing molecular sieve is obtained through washing, drying and roasting, 100g of the raw powder and 2g of sesbania powder are uniformly mixed, 30g of silica sol is added, the mixture is further uniformly mixed and then extruded into strips by a strip extruding machine for forming, and the formed samples are dried for 12 hours at 100 ℃ and then roasted to obtain the strip-shaped titanium-containing molecular sieve.
Preparation of molecular sieve ZSM-5: metal silicon powder, organic alkali R (one or two of tetrapropylammonium hydroxide and tetrabutylammonium hydroxide) and deionized water in the weight ratio of w (Si) w (R) w (H)2O) 81:1:320 to make a mixture; aging the mixture at 80-100 deg.C for 10 hr under stirring; adding one of aluminum source aluminum sulfate, aluminum oxide, aluminum hydroxide, aluminum nitrate, aluminum chloride or pseudo-boehmite, organic base R and deionized water into the aged material, and continuously aging for 16-24 hours at the temperature of 80-100 ℃ under the stirring state; transferring the obtained material to a crystallization kettle, and crystallizing for 48 hours at the temperature of 180 ℃; and filtering to obtain a product, washing the obtained solid until the pH value is 8-9, drying at 120 ℃, and roasting at 550 ℃ for 6 hours to obtain the ZSM-5 molecular sieve.
Preparation of molecular sieve Beta: silica sol (the content of silica is 27 wt%) is used as a silicon source, sodium metaaluminate is used as an aluminum source, tetraethylammonium hydroxide (the content is 25%) is used as a template agent, and the mass ratio of the silica sol to the sodium metaaluminate to the tetraethylammonium hydroxide to water is 35.32: 1.37: 13.6: 22.72, adding 140g of seed crystal, crystallizing at 165 ℃ for 72h, filtering, washing, drying and roasting to obtain Beta molecular sieve raw powder.
The present invention will be further described with reference to the following examples.
Example 1
158.22g of phosphoric acid solution with the mass fraction of 2 percent is taken, 50g of catalyst carrier Ts-1 is rapidly added, after static aging at 40 ℃ for 8h, after water is extracted by rotary evaporation, the catalyst is dried for 6h at 120 ℃ and roasted for 4h at 400 ℃ to obtain the catalyst.
Tabletting the prepared catalyst to form 20-40-mesh particles, filling 4g of the formed catalyst into a fixed bed, respectively taking o-chlorophenylethanol, m-chlorophenylethanol, p-chlorophenylethanol, o-bromophenylethanol, m-bromophenylethanol and p-bromophenylethanol as raw materials, controlling the reaction temperature at 275 ℃, controlling the reaction pressure at 0.01mpa, controlling the mass ratio of toluene to chlorophenylethanol at 1:1, feeding 8g of the catalyst per hour, and performing dehydration reaction.
Example 2
213.21g of ammonium dihydrogen phosphate solution with the mass fraction of 5 percent is taken, 50g of catalyst carrier Ti-MWW is rapidly added, after static aging is carried out for 8h at 40 ℃, rotary evaporation is carried out to remove water, drying is carried out for 6h at 120 ℃, and roasting is carried out for 4h at 400 ℃ to obtain the catalyst.
Tabletting the prepared catalyst to form 20-40-mesh particles, filling 4g of the formed catalyst into a fixed bed, respectively taking o-chlorophenylethanol, m-chlorophenylethanol, p-chlorophenylethanol, o-bromophenylethanol, m-bromophenylethanol and p-bromophenylethanol as raw materials, controlling the reaction temperature at 290 ℃, the reaction pressure at 0.01mpa, the mass ratio of toluene to chlorophenylethanol at 1:1, feeding 8g of the catalyst per hour, and performing dehydration reaction.
Example 3
213.21g of diammonium hydrogen phosphate solution with the mass fraction of 5 percent is taken, 50g of catalyst carrier Ti-MOR is rapidly added, after static aging at 40 ℃ for 8h, rotary evaporation is carried out to remove water, drying is carried out at 120 ℃ for 6h, and roasting is carried out at 400 ℃ for 4h, thus obtaining the catalyst.
Tabletting the prepared catalyst to form 20-40-mesh particles, filling 4g of the formed catalyst into a fixed bed, respectively taking o-chlorophenylethanol, m-chlorophenylethanol, p-chlorophenylethanol, o-bromophenylethanol, m-bromophenylethanol and p-bromophenylethanol as raw materials, controlling the reaction temperature at 280 ℃, controlling the reaction pressure at 0.01mpa, controlling the mass ratio of toluene to chlorophenylethanol at 1:1, feeding 16g of the catalyst per hour, and performing dehydration reaction.
Example 4
336.98g of ammonium phosphate solution with the mass fraction of 5 percent is taken, 50g of catalyst carrier ZSM-5 (the organic alkali used in the preparation process of the molecular sieve is tetrapropylammonium hydroxide) is rapidly added, after the molecular sieve is statically aged for 8h at the temperature of 40 ℃, the moisture is extracted by rotary evaporation, the mixture is dried for 6h at the temperature of 120 ℃, and the mixture is roasted for 4h at the temperature of 400 ℃ to obtain the catalyst.
Tabletting the prepared catalyst to form 20-40-mesh particles, filling 4g of the formed catalyst into a fixed bed, respectively taking o-chlorophenylethanol, m-chlorophenylethanol, p-chlorophenylethanol, o-bromophenylethanol, m-bromophenylethanol and p-bromophenylethanol as raw materials, controlling the reaction temperature at 280 ℃, controlling the reaction pressure at 0.01mpa, controlling the mass ratio of toluene to chlorophenylethanol at 1:1, feeding 16g of the catalyst per hour, and performing dehydration reaction.
Example 5
240.7g of ammonium phosphate solution with the mass fraction of 5 percent is taken, 50g of catalyst carrier Beta molecular sieve is rapidly added, after static aging at 40 ℃ for 8h, rotary evaporation is carried out to remove water, drying is carried out at 120 ℃ for 6h, and roasting is carried out at 400 ℃ for 4h, thus obtaining the catalyst.
Tabletting the prepared catalyst to form 20-40-mesh particles, filling 4g of the formed catalyst into a fixed bed, respectively taking o-chlorophenylethanol, m-chlorophenylethanol, p-chlorophenylethanol, o-bromophenylethanol, m-bromophenylethanol and p-bromophenylethanol as raw materials, controlling the reaction temperature at 280 ℃, controlling the reaction pressure at 0.01mpa, controlling the mass ratio of toluene to chlorophenylethanol at 1:1, and feeding 20g of the catalyst per hour to perform dehydration reaction.
Example 6
253.14g of phosphoric acid solution with the mass fraction of 5 percent is taken, 50g of catalyst carrier Ts-1 is rapidly added, after static aging at 40 ℃ for 8h, after water is extracted by rotary evaporation, drying is carried out for 6h at 120 ℃, and roasting is carried out for 4h at 380 ℃ to obtain the catalyst.
Tabletting the prepared catalyst to form 20-40-mesh particles, filling 4g of the formed catalyst into a fixed bed, respectively taking o-chlorophenylethanol, m-chlorophenylethanol, p-chlorophenylethanol, o-bromophenylethanol, m-bromophenylethanol and p-bromophenylethanol as raw materials, controlling the reaction temperature at 275 ℃, controlling the reaction pressure at 0.02mpa, controlling the mass ratio of toluene to chlorophenylethanol at 1:1, feeding 16g of the catalyst per hour, and performing dehydration reaction.
Example 7
253.14g of phosphoric acid solution with the mass fraction of 5 percent is taken, 50g of catalyst carrier Ti-MWW is rapidly added, after static aging at 40 ℃ for 8h, spin-steaming is carried out to remove water, drying is carried out for 6h at 120 ℃, and roasting is carried out for 4h at 380 ℃ to obtain the catalyst.
Tabletting the prepared catalyst to form 20-40-mesh particles, filling 4g of the formed catalyst into a fixed bed, respectively taking o-chlorophenylethanol, m-chlorophenylethanol, p-chlorophenylethanol, o-bromophenylethanol, m-bromophenylethanol and p-bromophenylethanol as raw materials, controlling the reaction temperature at 300 ℃, controlling the reaction pressure at 0.02mpa, controlling the mass ratio of toluene to chlorophenylethanol at 1:1, feeding 24g of the catalyst per hour, and performing dehydration reaction.
The conversion rates of the halogenated phenethyl alcohols of different raw materials in examples 1-7 are shown in Table 1.
TABLE 1
Figure BDA0003133381890000061
The selectivity of the halogenated styrene products of examples 1-7 is shown in Table 2.
TABLE 2
Figure BDA0003133381890000062
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. A preparation method of a supported catalyst for preparing halogenated styrene is characterized by comprising the following steps:
(1) preparing a phosphorus source into a solution with the mass fraction of 1-5%, and adding a molecular sieve carrier;
(2) and aging for 2-10 h, drying and roasting to obtain the supported catalyst.
2. The method for preparing a supported catalyst for preparing halogenated styrene according to claim 1, wherein the molecular sieve support in step (1) is any one of TS-1, Ti-MWW, Ti-MOR, ZSM-5 and Beta molecular sieves.
3. The method for preparing a supported catalyst for halogenated styrene according to claim 1, wherein said phosphorus source in step (1) is at least one of phosphoric acid, diammonium hydrogen phosphate, ammonium phosphate.
4. The method for preparing the supported catalyst for preparing halogenated styrene according to claim 1, wherein the drying temperature in the step (2) is 80-120 ℃ and the drying time is 4-10 h.
5. The method for preparing the supported catalyst for preparing halogenated styrene according to claim 1, wherein the calcination temperature in the step (2) is 250 to 450 ℃ and the calcination time is 2 to 6 hours.
6. The supported catalyst for preparing halogenated styrene prepared by the preparation method according to any one of claims 1 to 5, which is characterized by comprising a carrier and a supported component, wherein the supported component is calculated by phosphorus pentoxide, and the supported amount is 1-10% of the mass fraction of the catalyst carrier.
7. Use of the supported catalyst for the preparation of halostyrenes according to claim 6, characterized in that it comprises the following steps:
and filling the catalyst in a fixed bed, and carrying out dehydration reaction by using halogenated phenethyl alcohol as a raw material to generate halogenated styrene.
8. The use of the supported catalyst for preparing halogenated styrene according to claim 6, wherein the halogenated phenethyl alcohol is any one of p-chlorobenzene ethanol, m-chlorobenzene ethanol, o-chlorobenzene ethanol, p-bromobenzene ethanol, m-bromobenzene ethanol and o-bromobenzene ethanol.
9. The application of the supported catalyst for preparing halogenated styrene according to claim 6, wherein the dehydration reaction temperature is 250-330 ℃, the reaction pressure is 0-0.1 MPa, and the space velocity of halogenated phenethyl alcohol is 0.5-5 h-1。
10. The application of the supported catalyst for preparing halogenated styrene according to claim 9, wherein the dehydration reaction temperature is 270-300 ℃, the reaction pressure is 0.02-0.06 MPa, and the space velocity of halogenated phenethyl alcohol is 1-3h-1。
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