CN107774307B - Catalyst for synthesizing vinyl acetate - Google Patents

Catalyst for synthesizing vinyl acetate Download PDF

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CN107774307B
CN107774307B CN201610750240.2A CN201610750240A CN107774307B CN 107774307 B CN107774307 B CN 107774307B CN 201610750240 A CN201610750240 A CN 201610750240A CN 107774307 B CN107774307 B CN 107774307B
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catalyst
vinyl acetate
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reaction mixture
activated carbon
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CN107774307A (en
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邱鹏远
杨运信
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Sinopec Shanghai Research Institute of Petrochemical Technology
China Petrochemical Corp
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Sinopec Shanghai Research Institute of Petrochemical Technology
China Petrochemical Corp
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    • 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
    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
    • B01J31/04—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing carboxylic acids or their salts
    • 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
    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
    • 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
    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
    • B01J31/28—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24 of the platinum group metals, iron group metals or copper
    • 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
    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
    • B01J31/28—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24 of the platinum group metals, iron group metals or copper
    • B01J31/30—Halides
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C67/00—Preparation of carboxylic acid esters
    • C07C67/04—Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides onto unsaturated carbon-to-carbon bonds

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Abstract

The invention relates to a catalyst for synthesizing vinyl acetate and a preparation method thereof, which mainly solve the problem of high content of byproduct benzene in the prior art. The invention adopts the technical scheme that the catalyst for synthesizing the vinyl acetate adopts the active carbon as a carrier, the active component comprises zinc acetate and a cocatalyst, and the cocatalyst comprises at least one metal element selected from IIIA elements, so that the problem is better solved, and the catalyst can be used in the industrial production of synthesizing the vinyl acetate by the acetylene method.

Description

Catalyst for synthesizing vinyl acetate
Technical Field
the invention relates to an acetylene gas phase method vinyl acetate catalyst, a preparation method of the catalyst and a synthetic method of vinyl acetate.
Background
Vinyl acetate, abbreviated as Vinyl Acetate (VAM), is an important organic chemical raw material, is mainly used for producing derivatives such as polyvinyl acetate (PVAc), polyvinyl alcohol (PVOH), vinyl acetate-ethylene copolymer emulsion (VAE) or copolymer resin (EVA), vinyl acetate-vinyl chloride copolymer (EVC), polyacrylonitrile comonomer, acetal resin and the like, and has wide development and utilization values in the aspects of coating, slurry, adhesive, vinylon, film, leather processing, synthetic fiber, soil improvement and the like. With the continuous progress of production technology, the application field is still expanding.
The worldwide vinyl acetate production in 2011 reaches 743.4 million tons/year, and is mainly concentrated in Asia, North America and Western Europe. According to regional capacity statistics, Asia Tai is 398.8 ten thousand tons/year, accounting for 53.6%; north america at 206.3 ten thousand tons/year, accounting for 27.8%; western Europe is 117.1 ten thousand tons/year, accounting for 15.8%; the other areas account for 2.9%. Wherein the yield of the Chinese vinyl acetate is 216.5 ten thousand tons/year.
At present, the main production process routes of vinyl acetate are an ethylene method and an acetylene method. The acetylene method comprises a natural gas acetylene method and a calcium carbide acetylene method. The natural gas acetylene method adopts a fixed bed process, and selects granular zinc acetate/active carbon catalyst; the calcium carbide acetylene method adopts a fluidized bed process and selects powdery zinc acetate/active carbon catalyst. Because of different resource structures, countries and regions such as North America, Western Europe, Nippon singapore and the like basically adopt an ethylene process, while countries and regions such as Korea and India all adopt an acetylene process, and countries and regions such as China, Russia, eastern Europe and the like coexist. With the discovery of new natural gas and shale gas resources in China and the maturity and perfection of the exploitation technology thereof, the natural gas acetylene method vinyl acetate production process has very good prospects in China.
In 1922, Wacker Germany firstly used a method for synthesizing VAM from acetylene in a gas phase, and then the VAM was put into industrial production through the improvement of Hochst company. The catalyst uses zinc acetate as an active component and active carbon as a carrier, and is used up to now. The catalyst has the disadvantages of rapid activity reduction, low production capacity, increased by-products along with the increase of reaction temperature and short service life of the catalyst. Meanwhile, the acetylene method has the advantages of simple technology, cheap and easily obtained catalyst, good activity, high selectivity, low construction cost and the like. Therefore, how to effectively improve the activity and service life of the catalyst becomes an important scientific problem in the field of catalysis, researchers in various countries start to systematically research the problem from aspects of selection and modification of active components, promoters, carriers, catalyst preparation processes and the like, and certain stage results are obtained.
For example, Japanese scholars propose two-component oxides (V 2 O 5 -ZnO, Fe 2 O 3 -ZnO) or three-component oxides (16ZnO 32Fe 2 O 3. V 2 O 5 and 24ZnO 8Cr 2 O 3. V 2 O 5) as active components of catalysts, although the catalysts have higher activity than Zn (OAc) 2/C catalysts under 250 catalysis, industrialization cannot be realized due to the disadvantages of high reaction temperature, high cost, rapid activity reduction and the like.
For example, Chinese patent (CN 1903435A, a catalyst for vinyl acetate synthesis and a preparation method thereof) selects bismuth subcarbonate as the cocatalyst, so that the space-time yield of vinyl acetate of the catalyst is increased from 2.02t/m 3 d to 2.67t/m 3 d, and the catalyst activity is increased by 32.2%.
For a long time, many scholars at home and abroad have not succeeded in experiments of replacing the activated carbon carrier with silica gel, alumina, aluminum silicate, molecular sieve and the like. The studies in the literature (chemical engineering, 1962,85(16): 1; petrochemical, 1979, (8)7:49) have found that the catalyst activity is much lower than that of the activated carbon supported catalyst when silica gel, alumina, aluminum silicate and molecular sieves are used as the carriers. Practice proves that the activated carbon is not replaceable as a carrier of the acetylene method vinyl acetate catalyst. Meanwhile, researchers consider modifying the activated carbon carrier, so that the purpose of improving the performance of the carrier is achieved. For example, the activity of the catalyst prepared by using activated carbon with 15 percent of nitric acid by mass as a carrier is improved by 5.36 percent compared with the catalyst prepared by using untreated activated carbon as a carrier by the research of documents (petrochemical industry, 2004,33(11): 1024). Chinese patent CN 102029193A, an active carbon used as a catalyst carrier and a treatment method and application thereof, selects hydrogen peroxide to carry out pretreatment on the active carbon carrier, and the result shows that the catalytic activity of the catalyst prepared by the active carbon treated by the method is improved by 2-15%. Chinese patent (CN 102284304a, a preparation method of a high-efficiency catalyst for synthesizing vinyl acetate by an acetylene method) selects a series of oxidants such as sulfuric acid, potassium permanganate, and ammonium persulfate in addition to hydrogen peroxide to pretreat activated carbon for preparation of a catalyst for synthesizing vinyl acetate. Although the activity of the catalyst can be improved to a certain extent by selecting the oxidant to carry out pretreatment on the activated carbon carrier, most of the activated carbon treated by the acid or other oxidants needs to be washed and extracted for a long time to make the activated carbon neutral, the drying time is long, and the production time and the cost of the catalyst are increased.
With the recent continuous operation of new and expanded vinyl acetate plants in China, the market of vinyl acetate in China has become saturated and even has been in excess. Therefore, how to develop the downstream market of vinyl acetate is urgent to develop a downstream product of vinyl acetate with high added value. And improving the quality of the vinyl acetate product is one of the important precondition factors for developing downstream products with high added value.
Vinyl acetate is used for synthesizing vinyl acetate-ethylene copolymer (VAE) emulsion which is used for cigarette glue in the cigarette production process, but at present, only the ethylene vinyl acetate product index in China reaches the quality requirement of the cigarette glue used in the cigarette industry. The vinyl acetate product produced by the acetylene method contains a small amount of byproduct benzene (<5ppmw), so that the application of the vinyl acetate product to the production of the cigarette adhesive raw material VAE emulsion is restricted, and the problem of how to reduce the byproduct benzene in the vinyl acetate product produced by the acetylene method becomes a core problem restricting the application of the vinyl acetate product to the cigarette adhesive raw material. The research work of academia and industry on the acetylene method vinyl acetate catalyst mainly focuses on improving the catalyst activity, the catalyst service life and the like, and the problem of improving the selectivity of the catalyst, particularly reducing the content of the byproduct benzene, is not reported.
Disclosure of Invention
One of the technical problems to be solved by the invention is the problem of high content of byproduct benzene in the prior art, and provides a novel vinyl acetate catalyst which has the characteristic of low content of generated byproduct benzene.
The second technical problem to be solved by the present invention is to provide a method for preparing a catalyst corresponding to the first technical problem.
The third technical problem to be solved by the present invention is to provide a method for synthesizing vinyl acetate by using the catalyst described in one of the above technical problems.
In order to solve one of the above technical problems, the technical scheme adopted by the invention is as follows: the catalyst for synthesizing the vinyl acetate adopts active carbon as a carrier, the active component comprises zinc acetate and a cocatalyst, and the cocatalyst comprises at least one metal element selected from IIIA elements.
The addition of the cocatalyst reduces the generation amount of impurity benzene.
In the technical scheme, the catalyst composition can contain no alkali metal acetate, for example, potassium acetate, and the alkali metal acetate causes the content of harmful impurity benzene in the product to be increased.
In the above technical scheme, the activated carbon is preferably at least one of coal activated carbon, coconut shell activated carbon, apricot shell activated carbon and bamboo activated carbon.
In the technical scheme, the specific surface area of the activated carbon is preferably 1000-1500 m 2/g, and the adsorption pore volume is preferably 0.60-1.00 cm 3/g.
In the above technical solution, the cocatalyst preferably further comprises at least one metal element of platinum cluster elements.
in the above technical solution, the IIIA element is preferably at least one selected from aluminum, gallium, indium and thallium, and more preferably includes both gallium and indium.
In the above technical solution, the platinum cluster element is preferably at least one selected from ruthenium, rhodium, palladium, osmium, iridium, and platinum.
In the above technical solution, when the platinum group element at least comprises Ir or Pt and the IIIA element at least comprises Ga, the above two elements have synergistic effect in reducing the content of impurity benzene in the product. It is noted that no such synergy is found between indium and rhodium, indium and ruthenium.
In the above technical scheme, when the platinum group elements at least comprise Ir and Pt and the IIIA elements at least comprise Ga or In, the above elements have synergistic effect In reducing the content of impurity benzene In the product.
In the above technical scheme, when the platinum group elements at least comprise Ir and Pt and the IIIA elements at least comprise Ga and In, the above elements have synergistic effect In reducing the content of impurity benzene In the product.
In the technical scheme, the content of the zinc acetate in the catalyst is preferably 50-300 g/L, and more preferably 80-200 g/L.
In the technical scheme, the content of the cocatalyst in the catalyst is preferably 0.50-8.00 g/L, and more preferably 1.00-5.00 g/L.
To solve the second technical problem, the technical solution of the present invention is as follows: the method for producing the catalyst in the technical scheme of one of the technical problems comprises the following steps:
Mixing zinc acetate and cocatalyst solution with carrier according to the composition of catalyst.
Drying.
In the above technical scheme, as non-limiting examples, the corresponding compound form of the cocatalyst can be:
The compound of the IIIA element is preferably at least one of aluminum trichloride, aluminum sulfate, aluminum acetate, gallium nitrate, gallium trichloride, gallium acetate, indium trichloride, indium nitrate and indium acetate, and more preferably at least one of gallium trichloride and indium acetate; the compound of the platinum cluster element is preferably at least one selected from rhodium trichloride, rhodium nitrate, palladium dichloride, palladium tetraammine dichloride, palladium acetate, ruthenium trichloride, ruthenium acetate, platinum dichloride, chloroplatinic acid, platinum acetate, osmium acetate, iridium trichloride, iridium acetate and chloroiridic acid, and more preferably at least one selected from chloroiridic acid and chloroplatinic acid.
To solve the third technical problem, the technical scheme of the invention is as follows: the vinyl acetate synthesis method takes acetic acid and acetylene as raw materials, and the vinyl acetate is generated by reaction in the presence of the catalyst in any one of the technical schemes of the technical problems.
-1The key point of the invention is the selection of a catalyst, and a person skilled in the art knows how to determine a proper reaction temperature, reaction time, reaction pressure and material ratio according to actual needs.
The contents of all components in the reaction product are analyzed by a gas chromatography-mass spectrometer (GC-MS), and the space-time yield of the vinyl acetate of the catalyst is calculated.
Compared with the prior art, the key of the invention is that the active component of the catalyst comprises zinc acetate and at least one metal element compound selected from IIIA and platinum group, which is beneficial to improving the selectivity of the catalyst and reducing the content of byproduct benzene in the product.
The experimental result shows that when the catalyst is adopted, the space-time yield of the vinyl acetate of the catalyst reaches 75.3 g/(L.h), the benzene content in the reaction mixture is reduced to 2250ppbw, and a better technical effect is achieved, particularly, when the active component in the catalyst simultaneously comprises zinc acetate, at least one metal element compound selected from IIIA and at least one metal element compound selected from platinum group, a more prominent technical effect is achieved, and the catalyst can be used in the industrial production of the vinyl acetate. The invention is further illustrated by the following examples.
Detailed Description
[ example 1 ]
The preparation of the catalyst comprises the steps of fully mixing and dissolving 98g of zinc acetate (Zn (OAc) 2) and gallium trichloride (GaCl 3) containing 2.80g of Ga in an acetic acid water solution to obtain 350ml of impregnation liquid with the pH value of 4.8, impregnating 1L of cylindrical coal-based activated carbon carrier with the diameter of 3mm, the length of 2cm, the pore volume of 0.80cm 3/g and the specific surface area of 1200m 2/g in the impregnation liquid, standing for 3h, and drying at 110 to obtain the catalyst, wherein the zinc acetate content of the catalyst is 98g/L and the Pb content of 2.80g/L are measured by ICP.
The synthesis of vinyl acetate comprises the steps of filling 30ml of catalyst in a miniature fixed bed reactor, testing leakage by using N 2, fully purging the system by using N 2, heating the system, closing N 2, sequentially cutting in acetylene and starting a acetic acid pump, controlling the reaction temperature to 178 ℃, the reaction pressure to be 0.25atm, the volume space velocity of raw materials to be 300h -1, keeping the molar ratio of acetylene to acetic acid to be 6:1, and stopping the reaction after continuously reacting for 50 h.
Analysis of the reaction mixture: the reaction mixture obtained by the above reaction was analyzed by gas chromatography-mass spectrometer (GC-MS).
The calculated catalyst space time yield of vinyl acetate was 75.3 g/(L.h) and the benzene content in the reaction mixture was 2250 ppbw. For ease of illustration and comparison, the catalyst composition, the vinyl acetate space time yield of the catalyst, and the benzene content of the reaction mixture are shown in Table 1.
[ example 2 ]
The preparation of the catalyst comprises the steps of fully mixing and dissolving 98g of zinc acetate (Zn (OAc) 2) and 2.80g of chloro-iridic acid (H 2 IrCl 6 & 6H 2 O) containing Ir in an acetic acid aqueous solution to obtain 350ml of impregnation liquid with the pH value of 4.8, immersing 1L of cylindrical coal activated carbon carrier with the diameter of 3mm, the length of 2cm, the pore volume of 0.80cm 3/g and the specific surface area of 1200m 2/g in the impregnation liquid, standing for 3H, and drying on 110 to obtain the catalyst, wherein the ICP content of the catalyst is 98g/L, and the Ir content of the catalyst is 2.80 g/L.
The synthesis of vinyl acetate comprises the steps of filling 30ml of catalyst in a miniature fixed bed reactor, testing leakage by using N 2, fully purging the system by using N 2, heating the system, closing N 2, sequentially cutting in acetylene and starting a acetic acid pump, controlling the reaction temperature to 178 ℃, the reaction pressure to be 0.25atm, the volume space velocity of raw materials to be 300h -1, keeping the molar ratio of acetylene to acetic acid to be 6:1, and stopping the reaction after continuously reacting for 50 h.
And (3) product analysis: and cooling, decompressing and separating a reaction mixture obtained by the reaction, and analyzing a liquid phase by using a gas chromatography-mass spectrometer (GC-MS).
The calculated catalyst space time yield of vinyl acetate was 73.9 g/(L.h), the benzene content in the reaction mixture was 2300 ppbw. For ease of illustration and comparison, the catalyst composition, the vinyl acetate space time yield of the catalyst, and the benzene content of the reaction mixture are shown in Table 1.
[ COMPARATIVE EXAMPLE 1 ]
Are comparative examples of [ example 1 ] and [ example 2 ].
The preparation of the catalyst comprises the steps of dissolving 98g of zinc acetate (Zn (OAc) 2) in an acetic acid water solution to obtain an impregnation liquid with the pH value of 4.8, impregnating 1L of cylindrical activated carbon carrier with the diameter of 3mm, the length of 2cm, the pore volume of 0.80cm 3/g and the specific surface area of 1200m 2/g in the impregnation liquid, standing for 3h, and drying on a 110 bed to obtain the catalyst, wherein the zinc acetate content of the catalyst is 98g/L through ICP measurement.
The synthesis of vinyl acetate comprises the steps of filling 30ml of catalyst in a miniature fixed bed reactor, testing leakage by using N 2, fully purging the system by using N 2, heating the system, closing N 2, sequentially cutting in acetylene and starting a acetic acid pump, controlling the reaction temperature to 178 ℃, the reaction pressure to be 0.25atm, the volume space velocity of raw materials to be 300h -1, keeping the molar ratio of acetylene to acetic acid to be 6:1, and stopping the reaction after continuously reacting for 50 h.
Analysis of the reaction mixture: the reaction mixture obtained by the above reaction was analyzed by gas chromatography-mass spectrometer (GC-MS).
The calculated catalyst space time yield of vinyl acetate was 63.2 g/(L.h), the benzene content in the reaction mixture was 5520 ppbw. For ease of illustration and comparison, the catalyst composition, the vinyl acetate space time yield of the catalyst, and the benzene content of the reaction mixture are shown in Table 1.
[ COMPARATIVE EXAMPLE 2 ]
The preparation of the catalyst comprises the steps of fully mixing and dissolving 98g of zinc acetate (Zn (OAc) 2), 6.30g of potassium acetate (KOAc) and 2.80g of Ir-containing chloroiridic acid (H 2 IrCl 6 & 6H 2 O) in an acetic acid aqueous solution to obtain 350ml of impregnation liquid with the pH value of 4.8, immersing 1L of cylindrical coal-based carrier with the diameter of 3mm, the length of 2cm, the pore volume of 0.80cm 3/g and the specific surface area of 1200m 2/g in the impregnation liquid, standing for 3H and drying on a 110 by ICP (inductively coupled plasma), thus obtaining the catalyst, and measuring the zinc acetate content of the catalyst to be 98g/L, the potassium acetate content to be 6.30g/L and the Ir content to be 2.80g/L by activated carbon.
The synthesis of vinyl acetate comprises the steps of filling 30ml of catalyst in a miniature fixed bed reactor, testing leakage by using N 2, fully purging the system by using N 2, heating the system, closing N 2, sequentially cutting in acetylene and starting a acetic acid pump, controlling the reaction temperature to 178 ℃, the reaction pressure to be 0.25atm, the volume space velocity of raw materials to be 300h -1, keeping the molar ratio of acetylene to acetic acid to be 6:1, and stopping the reaction after continuously reacting for 50 h.
Analysis of the reaction mixture: the reaction mixture obtained by the above reaction was analyzed by gas chromatography-mass spectrometer (GC-MS).
The calculated catalyst space time yield of vinyl acetate was 78.6 g/(L.h), the benzene content in the reaction mixture was 5300 ppbw. For ease of illustration and comparison, the catalyst composition, the vinyl acetate space time yield of the catalyst, and the benzene content of the reaction mixture are shown in Table 1.
[ example 3 ]
The preparation of the catalyst comprises the steps of fully mixing and dissolving 98g of zinc acetate (Zn (OAc) 2) and rhodium trichloride containing 2.80g of Rh (RhCl 3.3H 2 O) in an acetic acid water solution to obtain 350ml of impregnation liquid with the pH value of 4.8, impregnating 1L of cylindrical activated carbon rhodium trichloride carrier with the diameter of 3mm, the length of 2cm, the pore volume of 0.80cm 3/g and the specific surface area of 1200m 2/g in the impregnation liquid, standing for 3H, and drying on a 110 to obtain the catalyst, wherein the zinc acetate content of the catalyst is 98g/L and the Rh content is 2.80g/L through ICP measurement.
The synthesis of vinyl acetate comprises the steps of filling 30ml of catalyst in a miniature fixed bed reactor, testing leakage by using N 2, fully purging the system by using N 2, heating the system, closing N 2, sequentially cutting in acetylene and starting a acetic acid pump, controlling the reaction temperature to 178 ℃, the reaction pressure to be 0.25atm, the volume space velocity of raw materials to be 300h -1, keeping the molar ratio of acetylene to acetic acid to be 6:1, and stopping the reaction after continuously reacting for 50 h.
Analysis of the reaction mixture: the reaction mixture obtained by the above reaction was analyzed by gas chromatography-mass spectrometer (GC-MS).
The calculated catalyst space time yield of vinyl acetate was 81.5 g/(L.h) and the benzene content in the reaction mixture was 2800 ppbw. For ease of illustration and comparison, the catalyst composition, the vinyl acetate space time yield of the catalyst, and the benzene content of the reaction mixture are shown in Table 1.
[ example 4 ]
The preparation of the catalyst comprises the steps of fully mixing and dissolving 98g of zinc acetate (Zn (OAc) 2) and ruthenium trichloride containing 2.80g of Ru (RuCl 3) in an acetic acid aqueous solution to obtain 350ml of impregnation liquid with the pH value of 4.8, impregnating 1L of cylindrical coal-based activated carbon carrier with the diameter of 3mm, the length of 2cm, the pore volume of 0.80cm 3/g and the specific surface area of 1200m 2/g in the impregnation liquid, standing for 3h, and drying on a 110 to obtain the catalyst, wherein the zinc acetate content of the catalyst is 98g/L and the Ru content of 2.80g/L are measured by ICP.
The synthesis of vinyl acetate comprises the steps of filling 30ml of catalyst in a miniature fixed bed reactor, testing leakage by using N 2, fully purging the system by using N 2, heating the system, closing N 2, sequentially cutting in acetylene and starting a acetic acid pump, controlling the reaction temperature to 178 ℃, the reaction pressure to be 0.25atm, the volume space velocity of raw materials to be 300h -1, keeping the molar ratio of acetylene to acetic acid to be 6:1, and stopping the reaction after continuously reacting for 50 h.
Analysis of the reaction mixture: the reaction mixture obtained by the above reaction was analyzed by gas chromatography-mass spectrometer (GC-MS).
The space time yield of vinyl acetate of the catalyst was calculated to be 78.6 g/(L.h) and the benzene content of the reaction mixture was 2550 ppbw. For ease of illustration and comparison, the catalyst composition, the vinyl acetate space time yield of the catalyst, and the benzene content of the reaction mixture are shown in Table 1.
[ example 5 ]
The preparation of the catalyst comprises the steps of fully mixing and dissolving 98g of zinc acetate (Zn (OAc) 2) and 2.80g of indium acetate (In (OAc) 3) containing In into an acetic acid aqueous solution to obtain 350ml of impregnation liquid with pH of 4.8, impregnating 1L of cylindrical coal active carbon carrier with the diameter of 3mm, the length of 2cm, the pore volume of 0.80cm 3/g and the specific surface area of 1200m 2/g into the impregnation liquid, standing for 3h, and drying on a 110 to obtain the catalyst, wherein the zinc acetate content of the catalyst is 98g/L and the In content is 2.80g/L as measured by ICP.
The synthesis of vinyl acetate comprises the steps of filling 30ml of catalyst in a miniature fixed bed reactor, testing leakage by using N 2, fully purging the system by using N 2, heating the system, closing N 2, sequentially cutting in acetylene and starting a acetic acid pump, controlling the reaction temperature to 178 ℃, the reaction pressure to be 0.25atm, the volume space velocity of raw materials to be 300h -1, keeping the molar ratio of acetylene to acetic acid to be 6:1, and stopping the reaction after continuously reacting for 50 h.
Analysis of the reaction mixture: the reaction mixture obtained by the above reaction was analyzed by gas chromatography-mass spectrometer (GC-MS).
The calculated catalyst space time yield of vinyl acetate was 81.2 g/(L.h) and the benzene content in the reaction mixture was 2810 ppbw. For ease of illustration and comparison, the catalyst composition, the vinyl acetate space time yield of the catalyst, and the benzene content of the reaction mixture are shown in Table 1.
[ COMPARATIVE EXAMPLE 3 ]
The preparation of the catalyst comprises the steps of fully mixing and dissolving 98g of zinc acetate (Zn (OAc) 2), 6.30g of potassium acetate (KOAc) and 2.80g of indium acetate containing In (OAc) 3) In an acetic acid aqueous solution to obtain 350ml of impregnation liquid with pH of 4.8, soaking 1L of cylindrical coal activated carbon carrier with the diameter of 3mm, the length of 2cm, the pore volume of 0.80cm 3/g and the specific surface area of 1200m 2/g In the impregnation liquid, standing for 3h, and drying In a 110 type manner to obtain the catalyst, wherein the zinc acetate content of the catalyst is 98g/L, the potassium acetate content of 6.30g/L and the In content of 2.80g/L are measured by ICP.
The synthesis of vinyl acetate comprises the steps of filling 30ml of catalyst in a miniature fixed bed reactor, testing leakage by using N 2, fully purging the system by using N 2, heating the system, closing N 2, sequentially cutting in acetylene and starting a acetic acid pump, controlling the reaction temperature to 178 ℃, the reaction pressure to be 0.25atm, the volume space velocity of raw materials to be 300h -1, keeping the molar ratio of acetylene to acetic acid to be 6:1, and stopping the reaction after continuously reacting for 50 h.
Analysis of the reaction mixture: the reaction mixture obtained by the above reaction was analyzed by gas chromatography-mass spectrometer (GC-MS).
The calculated catalyst has a vinyl acetate space-time yield of 90.9 g/(L.h) and a benzene content of 5330ppbw in the reaction mixture. For ease of illustration and comparison, the catalyst composition, the vinyl acetate space time yield of the catalyst, and the benzene content of the reaction mixture are shown in Table 1.
[ example 6 ]
The preparation of the catalyst comprises the steps of fully mixing and dissolving 98g of zinc acetate (Zn (OAc) 2) and chloroplatinic acid (H 2 PtCl 6.6H 2 O) containing 2.80g of Pt in an acetic acid water solution to obtain 350ml of impregnation liquid with the pH value of 4.8, immersing 1L of cylindrical coal activated carbon carrier with the diameter of 3mm, the length of 2cm, the pore volume of 0.80cm 3/g and the specific surface area of 1200m 2/g in the impregnation liquid, standing for 3H, and drying on 110 to obtain the catalyst, wherein the zinc acetate content of the catalyst is 98g/L through ICP measurement, and the Pt content is 2.80 g/L.
The synthesis of vinyl acetate comprises the steps of filling 30ml of catalyst in a miniature fixed bed reactor, testing leakage by using N 2, fully purging the system by using N 2, heating the system, closing N 2, sequentially cutting in acetylene and starting a acetic acid pump, controlling the reaction temperature to 178 ℃, the reaction pressure to be 0.25atm, the volume space velocity of raw materials to be 300h -1, keeping the molar ratio of acetylene to acetic acid to be 6:1, and stopping the reaction after continuously reacting for 50 h.
Analysis of the reaction mixture: the reaction mixture obtained by the above reaction was analyzed by gas chromatography-mass spectrometer (GC-MS).
The calculated catalyst space time yield of vinyl acetate was 83.6 g/(L.h) and the benzene content in the reaction mixture was 2950 ppbw. For ease of illustration and comparison, the catalyst composition, the vinyl acetate space time yield of the catalyst, and the benzene content of the reaction mixture are shown in Table 1.
[ COMPARATIVE EXAMPLE 4 ]
The preparation of the catalyst comprises the steps of fully mixing and dissolving 98g of zinc acetate (Zn (OAc) 2), 6.30g of potassium acetate (KOAc) and chloroplatinic acid (H 2 PtCl 6.6H 2 O) containing 2.80g of Pt in an acetic acid water solution to obtain 350ml of impregnation liquid with the pH value of 4.8, immersing 1L of activated carbon carrier with the diameter of 3mm, the length of 2cm, the pore volume of 0.80cm 3/g and the specific surface area of 1200m 2/g in the impregnation liquid, standing for 3H and drying on a 110 through ICP (inductively coupled plasma), thus obtaining the catalyst, and measuring the zinc acetate content of the catalyst to be 98g/L, the potassium acetate content to be 6.30g/L and the Pt content to be 2.80g/L through ICP.
The synthesis of vinyl acetate comprises the steps of filling 30ml of catalyst in a miniature fixed bed reactor, testing leakage by using N 2, fully purging the system by using N 2, heating the system, closing N 2, sequentially cutting in acetylene and starting a acetic acid pump, controlling the reaction temperature to 178 ℃, the reaction pressure to be 0.25atm, the volume space velocity of raw materials to be 300h -1, keeping the molar ratio of acetylene to acetic acid to be 6:1, and stopping the reaction after continuously reacting for 50 h.
Analysis of the reaction mixture: the reaction mixture obtained by the above reaction was analyzed by gas chromatography-mass spectrometer (GC-MS).
The calculated catalyst space time yield of vinyl acetate was 94.8 g/(L.h), and the benzene content in the reaction mixture was 6070 ppbw. For ease of illustration and comparison, the catalyst composition, the vinyl acetate space time yield of the catalyst, and the benzene content of the reaction mixture are shown in Table 1.
[ example 7 ]
The preparation of the catalyst comprises the steps of fully mixing and dissolving 98g of zinc acetate (Zn (OAc) 2), 1.30g of Ga (GaCl 3) and 1.50g of Ir-containing chloroiridic acid (H 2 IrCl 6 & 6H 2 O) in an acetic acid aqueous solution to obtain 350ml of impregnation liquid with the pH value of 4.8, soaking 1L of cylindrical coal-based activated carbon carrier with the diameter of 3mm, the length of 2cm, the pore volume of 0.80cm 3/g and the specific surface area of 1200m 2/g in the impregnation liquid, standing for 3H and drying on a 110 to obtain the catalyst, and measuring the zinc acetate content, the Ga content of 1.30g/L and the Ir content of 1.50g/L by ICP.
The synthesis of vinyl acetate comprises the steps of filling 30ml of catalyst in a miniature fixed bed reactor, testing leakage by using N 2, fully purging the system by using N 2, heating the system, closing N 2, sequentially cutting in acetylene and starting a acetic acid pump, controlling the reaction temperature to 178 ℃, the reaction pressure to be 0.25atm, the volume space velocity of raw materials to be 300h -1, keeping the molar ratio of acetylene to acetic acid to be 6:1, and stopping the reaction after continuously reacting for 50 h.
Analysis of the reaction mixture: the reaction mixture obtained by the above reaction was analyzed by gas chromatography-mass spectrometer (GC-MS).
The catalyst has a calculated vinyl acetate space-time yield of 74.9 g/(L.h) and a benzene content of 1520ppbw in the reaction mixture. For ease of illustration and comparison, the catalyst composition, the vinyl acetate space time yield of the catalyst, and the benzene content of the reaction mixture are shown in Table 1.
[ example 8 ]
The preparation of the catalyst comprises the steps of fully mixing and dissolving 98g of zinc acetate (Zn (OAc) 2), 1.30g of Ga-containing gallium trichloride (GaCl 3) and 1.50g of Pt-containing chloroplatinic acid (H 2 PtCl 6 & 6H 2 O) in an acetic acid water solution to obtain 350ml of impregnation liquid with the pH value of 4.8, immersing 1L of cylindrical coal-based activated carbon carrier with the diameter of 3mm, the length of 2cm, the pore volume of 0.80cm 3/g and the specific surface area of 1200m 2/g in the impregnation liquid, standing for 3H and drying on a 110 to obtain the catalyst, wherein the zinc acetate content of the catalyst is 98g/L, the Ga content of 1.30g/L and the Pt content of 1.50g/L are measured by ICP.
The synthesis of vinyl acetate comprises the steps of filling 30ml of catalyst in a miniature fixed bed reactor, testing leakage by using N 2, fully purging the system by using N 2, heating the system, closing N 2, sequentially cutting in acetylene and starting a acetic acid pump, controlling the reaction temperature to 178 ℃, the reaction pressure to be 0.25atm, the volume space velocity of raw materials to be 300h -1, keeping the molar ratio of acetylene to acetic acid to be 6:1, and stopping the reaction after continuously reacting for 50 h.
Analysis of the reaction mixture: the reaction mixture obtained by the above reaction was analyzed by gas chromatography-mass spectrometer (GC-MS).
The calculated catalyst space time yield of vinyl acetate was 80.6 g/(L.h), the benzene content in the reaction mixture was 1880 ppbw. For ease of illustration and comparison, the catalyst composition, the vinyl acetate space time yield of the catalyst, and the benzene content of the reaction mixture are shown in Table 1.
[ COMPARATIVE EXAMPLE 5 ]
The preparation of the catalyst comprises the steps of fully mixing and dissolving 98g of zinc acetate (Zn (OAc) 2), 1.30g of In-containing indium acetate (In (OAc) 3) and 1.50g of Rh-containing rhodium trichloride (RhCl 3.3H 2 O) In an acetic acid water solution to obtain 350ml of impregnation liquid with the pH value of 4.8, immersing 1L of cylindrical coal activated carbon carrier with the diameter of 3mm, the length of 2cm, the pore volume of 0.80cm 3/g and the specific surface area of 1200m 2/g In the impregnation liquid, standing for 3H and drying at 110 ℃ to obtain the catalyst, wherein the zinc acetate content of the catalyst is 98g/L, the In content of 1.30g/L and the Rh content of 1.50g/L are measured by ICP.
The synthesis of vinyl acetate comprises the steps of filling 30ml of catalyst in a miniature fixed bed reactor, testing leakage by using N 2, fully purging the system by using N 2, heating the system, closing N 2, sequentially cutting in acetylene and starting a acetic acid pump, controlling the reaction temperature to 178 ℃, the reaction pressure to be 0.25atm, the volume space velocity of raw materials to be 300h -1, keeping the molar ratio of acetylene to acetic acid to be 6:1, and stopping the reaction after continuously reacting for 50 h.
Analysis of the reaction mixture: the reaction mixture obtained by the above reaction was analyzed by gas chromatography-mass spectrometer (GC-MS).
The calculated catalyst space time yield of vinyl acetate was 83.5 g/(L.h) and the benzene content in the reaction mixture was 2800 ppbw. For ease of illustration and comparison, the catalyst composition, the vinyl acetate space time yield of the catalyst, and the benzene content of the reaction mixture are shown in Table 1.
[ COMPARATIVE EXAMPLE 6 ]
The preparation of the catalyst comprises the steps of fully mixing and dissolving 98g of zinc acetate (Zn (OAc) 2), 1.30g of In-containing indium acetate (In (OAc) 3) and 1.50g of Ru-containing ruthenium trichloride (RuCl 3) In an acetic acid aqueous solution to obtain 350ml of impregnation liquid with the pH value of 4.8, soaking 1L of cylindrical activated carbon carrier with the diameter of 3mm, the length of 2cm, the pore volume of 0.80cm 3/g and the specific surface area of 1200m 2/g In the impregnation liquid, standing for 3h, and drying at 110 ℃ to obtain the catalyst ICP, wherein the zinc acetate content of the catalyst is 98g/L, the In content of 1.30g/L and the Ru content of 1.50 g/L.
The synthesis of vinyl acetate comprises the steps of filling 30ml of catalyst in a miniature fixed bed reactor, testing leakage by using N 2, fully purging the system by using N 2, heating the system, closing N 2, sequentially cutting in acetylene and starting a acetic acid pump, controlling the reaction temperature to 178 ℃, the reaction pressure to be 0.25atm, the volume space velocity of raw materials to be 300h -1, keeping the molar ratio of acetylene to acetic acid to be 6:1, and stopping the reaction after continuously reacting for 50 h.
Analysis of the reaction mixture: the reaction mixture obtained by the above reaction was analyzed by gas chromatography-mass spectrometer (GC-MS).
The calculated catalyst space time yield of vinyl acetate was 83.1 g/(L.h), and the benzene content in the reaction mixture was 2760 ppbw. For ease of illustration and comparison, the catalyst composition, the vinyl acetate space time yield of the catalyst, and the benzene content of the reaction mixture are shown in Table 1.
[ example 9 ]
The preparation of the catalyst comprises the steps of fully mixing and dissolving 98g of zinc acetate (Zn (OAc) 2), gallium trichloride (GaCl 3) containing 1.30g of Ga, chloro-iridic acid (H 2 IrCl 6 & 6H 2 O) containing 0.70g of Ir and chloro-platinic acid (H 2 PtCl 6 & 6H 2 O) containing 0.80g of Pt in an acetic acid aqueous solution to obtain 350ml of impregnation liquid with pH of 4.8, and immersing 1L of a cylindrical activated carbon carrier with the diameter of 3mm, the length of 2cm, the pore volume of 0.80cm 3/g and the specific surface area of 1200m 2/g in the impregnation liquid, standing for 3H and drying on 110 to obtain the catalyst.
The synthesis of vinyl acetate comprises the steps of filling 30ml of catalyst in a miniature fixed bed reactor, testing leakage by using N 2, fully purging the system by using N 2, heating the system, closing N 2, sequentially cutting in acetylene and starting a acetic acid pump, controlling the reaction temperature to 178 ℃, the reaction pressure to be 0.25atm, the volume space velocity of raw materials to be 300h -1, keeping the molar ratio of acetylene to acetic acid to be 6:1, and stopping the reaction after continuously reacting for 50 h.
Analysis of the reaction mixture: the reaction mixture obtained by the above reaction was analyzed by gas chromatography-mass spectrometer (GC-MS).
the calculated catalyst space time yield of vinyl acetate was 76.8 g/(L.h), the benzene content in the reaction mixture being 1140 ppbw. For ease of illustration and comparison, the catalyst composition, the vinyl acetate space time yield of the catalyst, and the benzene content of the reaction mixture are shown in Table 1.
[ example 10 ]
The catalyst is prepared by mixing and dissolving 98g of zinc acetate (Zn (OAc) 2), 1.30g of In-containing indium acetate (In (OAc) 3), 0.70g of Ir-containing chloroiridic acid (H 2 IrCl 6 & 6H 2 O) and 0.80g of Pt-containing chloroplatinic acid (H 2 PtCl 6 & 6H 2 O) In an aqueous acetic acid solution to obtain 350ml of an impregnation solution with pH 4.8, and impregnating 1L of a cylindrical coal-based activated carbon support with a diameter of 3mm, a length of 2cm, a pore volume of 0.80cm 3/g and a specific surface area of 1200m 2/g In the impregnation solution, standing for 3H and drying In a 110-type to obtain the catalyst, wherein the catalyst has a zinc acetate content of 98g/L, an In content of 1.30g/L, an Ir content of 0.70g/L and a Pt content of 0.80g/L as measured by ICP.
The synthesis of vinyl acetate comprises the steps of filling 30ml of catalyst in a miniature fixed bed reactor, testing leakage by using N 2, fully purging the system by using N 2, heating the system, closing N 2, sequentially cutting in acetylene and starting a acetic acid pump, controlling the reaction temperature to 178 ℃, the reaction pressure to be 0.25atm, the volume space velocity of raw materials to be 300h -1, keeping the molar ratio of acetylene to acetic acid to be 6:1, and stopping the reaction after continuously reacting for 50 h.
Analysis of the reaction mixture: the reaction mixture obtained by the above reaction was analyzed by gas chromatography-mass spectrometer (GC-MS).
The calculated catalyst space time yield of vinyl acetate was 79.7 g/(L.h), the benzene content in the reaction mixture was 1230 ppbw. For ease of illustration and comparison, the catalyst composition, the vinyl acetate space time yield of the catalyst, and the benzene content of the reaction mixture are shown in Table 1.
[ example 11 ]
The preparation of the catalyst comprises the steps of fully mixing and dissolving 98g of zinc acetate (Zn (OAc) 2), 0.45g of Ga (GaCl 3), 0.85g of In (OAc) 3), 0.70g of Ir-containing chloro-iridic acid (H 2 IrCl 6.6H 2 O) and 0.80g of Pt-containing chloro-platinic acid (H 2 PtCl 6.6H 2 O) In an acetic acid aqueous solution to obtain 350ml of an impregnation solution with the pH value of 4.8, and immersing 1L of a cylindrical coal activated carbon carrier with the diameter of 3mm, the length of 2cm, the pore volume of 0.80cm 3/g and the specific surface area of 1200m 2/g In the impregnation solution, standing for 3H and drying In a 110 type to obtain the catalyst, wherein the zinc acetate content of the catalyst is 98g/L, the Ga content is 0.45g/L, the In content is 0.85g/L, the Ir content is 0.70g/L, and the Pt content is 0.80 g/L.
The synthesis of vinyl acetate comprises the steps of filling 30ml of catalyst in a miniature fixed bed reactor, testing leakage by using N 2, fully purging the system by using N 2, heating the system, closing N 2, sequentially cutting in acetylene and starting a acetic acid pump, controlling the reaction temperature to 178 ℃, the reaction pressure to be 0.25atm, the volume space velocity of raw materials to be 300h -1, keeping the molar ratio of acetylene to acetic acid to be 6:1, and stopping the reaction after continuously reacting for 50 h.
Analysis of the reaction mixture: the reaction mixture obtained by the above reaction was analyzed by gas chromatography-mass spectrometer (GC-MS).
The space time yield of vinyl acetate of the catalyst was calculated to be 77.6 g/(L.h), and the benzene content in the reaction mixture was 770 ppbw. For ease of illustration and comparison, the catalyst composition, the vinyl acetate space time yield of the catalyst, and the benzene content of the reaction mixture are shown in Table 1.
As can be seen from the comparison of comparative example 1 with examples 1 to 11, IIIA metal or platinum group metal has the effect of reducing the content of benzene as an impurity in the reaction mixture.
It can be seen from example 7 in comparison with examples 1 and 2 that Ga and Ir have a synergistic effect in reducing the content of benzene as an impurity in the reaction mixture. It can be seen from the comparison of example 8 with examples 1 and 6 that Ga and Pt have a synergistic effect in reducing the content of benzene as an impurity in the reaction mixture. However, a comparable ratio of comparative example 5 to examples 3 and 5, or a comparable ratio of comparative example 6 to examples 4 and 5, shows that In and Rh, or In and Ru, are not synergistic In reducing the level of benzene impurity In the reaction mixture.
Example 9 in comparison to examples 7 and 8 shows that Ir and Pt have a synergistic effect in reducing the level of benzene impurity in the reaction mixture.
Example 11 In comparison to examples 9 and 10 shows that Ga and In have a synergistic effect In reducing the content of benzene as an impurity In the reaction mixture.
TABLE 1

Claims (6)

1. The catalyst for synthesizing the vinyl acetate adopts active carbon as a carrier, and comprises zinc acetate and a cocatalyst as active components, wherein the cocatalyst comprises at least one metal element selected from IIIA elements and at least one element selected from platinum group elements, the IIIA elements at least comprise Ga and/or In, and the platinum group elements at least comprise Ir and/or Pt; wherein, the content of zinc acetate in the catalyst is as follows: 50-300 g/L, and the content of the cocatalyst is as follows: 1.00-8.00 g/L.
2. The catalyst according to claim 1, wherein the activated carbon is at least one of coal-based activated carbon, coconut shell activated carbon, apricot shell activated carbon, and bamboo-based activated carbon.
3. The catalyst according to claim 1, wherein the activated carbon has a specific surface area of 1000 to 1500m 2/g and an adsorption pore volume of 0.60 to 1.00cm 3/g.
4. A method for producing the catalyst of claim 1, comprising the steps of:
Mixing zinc acetate and a solution of a cocatalyst with a carrier according to the composition of a catalyst;
Drying.
5. A method for synthesizing vinyl acetate, which takes acetic acid and acetylene as raw materials and synthesizes the vinyl acetate under the catalyst of any one of claims 1 to 3.
6. The synthesis method according to claim 5, wherein the raw material composition comprises acetylene, acetic acid ═ 1 (5-12) in molar ratio.
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