Catalysts for the production of vinyl acetate

A vinyl acetate and catalyst technology, applied in the field of acetylene vapor phase vinyl acetate catalyst, can solve the problems of corrosion, unspecified catalyst activity data, environmental pollution, etc.

Active Publication Date: 2019-11-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent (CN 86107833A, a catalyst for the synthesis of vinyl acetate and its preparation method) reported ZnO-ZnCl 2 / C catalyst has a higher space-time yield than Zn(OAc) 2 / C catalyst is about 30%, but because of the use of nitrate in the preparation process of the catalyst, a large amount of NO will be generated during decomposition x And pollute the environment, and ZnCl is added in the catalyst 2 , Cl - It is corrosive to equipment, which limits the promotion of this catalyst
Chinese patent (CN 102284304A, a preparation method of a high-efficiency catalyst for the synthesis of vinyl acetate by acetylene method) in addition to hydrogen peroxide, also selects a series of oxidants such as sulfuric acid, potassium permanganate and ammonium persulfate to pretreat activated carbon and use it to synthesize acetic acid Preparation of ethylene catalyst, the patent only reports the percentage of vinyl acetate in the product, and does not indicate the activity data of the catalyst
And academia and industry mainly focus on the problems such as improving catalyst activity and catalyst life-span for the research work of acetylene method vinyl acetate catalyst, for improving the selectivity of catalyst, especially the problem of reducing by-product benzene content has not been reported

Method used

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  • Catalysts for the production of vinyl acetate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The preparation of catalyst: 104g zinc acetate (Zn(OAc) 2 ), praseodymium acetate (Pr(OAc) containing 3.40g Pr 3 ·5H 2 O) fully mix and dissolve in aqueous acetic acid solution to obtain 350ml of impregnating solution with a pH of 4.8, 1L of 3mm in diameter, 2cm in length, and 0.80cm in pore volume 3 / g, the specific surface area is 1200m 2 / g columnar coal-based activated carbon carrier was impregnated in the above impregnating solution, left to stand for 3 hours and dried at 110°C to obtain the catalyst. The zinc acetate content of this catalyst measured by ICP is 104g / L, and the Pr content is 3.40g / L.

[0039] The synthesis of vinyl acetate: 30ml catalyst is packed in the miniature fixed-bed reactor, with N 2 After leak test, use N 2 Fully purge the system, after the system heats up, turn off the N 2 , cut into acetylene in turn, turn on the acetic acid pump, control the reaction temperature to 178°C, and the reaction pressure to 0.25atm; raw material volume sp...

Embodiment 2

[0043] The preparation of catalyst: 104g zinc acetate (Zn(OAc) 2 ), ammonium molybdate ((NH 4 ) 6 Mo 7 o 24 .4H 2 O) fully mix and dissolve in aqueous acetic acid solution to obtain 350ml of impregnating solution with a pH of 4.8, 1L of 3mm in diameter, 2cm in length, and 0.80cm in pore volume 3 / g, the specific surface area is 1200m 2 / g columnar coal-based activated carbon carrier was impregnated in the above impregnating solution, left to stand for 3 hours and dried at 110°C to obtain the catalyst. The Zn content of the catalyst measured by ICP is 104g / L, and the Mo content is 3.40g / L.

[0044] The synthesis of vinyl acetate: 30ml catalyst is packed in the miniature fixed-bed reactor, with N 2 After leak test, use N 2 Fully purge the system, after the system heats up, turn off the N 2 , cut into acetylene in turn, turn on the acetic acid pump, control the reaction temperature to 178°C, and the reaction pressure to 0.25atm; raw material volume space velocity: 300h ...

Embodiment 3

[0059] The preparation of catalyst: 104g zinc acetate (Zn(OAc) 2 ), lanthanum acetate (La(OAc) containing 3.40g La 3 ·5H 2 O) fully mix and dissolve in aqueous acetic acid solution to obtain 350ml of impregnating solution with a pH of 4.8, 1L of 3mm in diameter, 2cm in length, and 0.80cm in pore volume 3 / g, the specific surface area is 1200m2 / g columnar coal-based activated carbon carrier was impregnated in the above impregnating solution, left to stand for 3 hours and dried at 110°C to obtain the catalyst. The zinc acetate content of this catalyst measured by ICP is 104g / L, and the La content is 3.40g / L.

[0060] The synthesis of vinyl acetate: 30ml catalyst is packed in the miniature fixed-bed reactor, with N 2 After leak test, use N 2 Fully purge the system, after the system heats up, turn off the N 2 , cut into acetylene in turn, turn on the acetic acid pump, control the reaction temperature to 178°C, and the reaction pressure to 0.25atm; raw material volume space v...

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Abstract

The invention relates to a catalyst for producing vinyl acetate in an acetylene method and a preparation method of the catalyst, which mainly solves the problem in the prior art that the content of byproduct benzene is high. According to the catalyst for producing the vinyl acetate, the catalyst adopts active carbon as a carrier, and active components comprise zinc acetate and co-catalyst, and theco-catalyst comprises at least one metal element in VIB metals, so that the problem is well solved, and the catalyst can be applied to the industrial production of the acetylene-method vinyl acetate.

Description

technical field [0001] The invention relates to a vinyl acetate catalyst for the acetylene gas phase method, a preparation method of the catalyst, and a synthesis method of vinyl acetate. Background technique [0002] Vinyl acetate, referred to as vinyl acetate (VAM), is an important organic chemical raw material, mainly used in the production of polyvinyl acetate (PVAc), polyvinyl alcohol (PVOH), vinyl acetate-ethylene copolymer emulsion (VAE) or copolymer resin (EVA), vinyl acetate-vinyl chloride copolymer (EVC), polyacrylonitrile comonomer and acetal resin derivatives, in coatings, pastes, adhesives, vinylon, films, leather processing, synthetic fibers, soil Improvement and other aspects have extensive development and utilization value. With the continuous progress of production technology, its application field is still expanding. [0003] In 2011, the global production capacity of vinyl acetate reached 7.434 million tons per year, mainly concentrated in Asia, North Am...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/04B01J31/34C07C67/04C07C69/15
CPCB01J31/04B01J31/34C07C67/04C07C69/15
Inventor 邱鹏远杨运信
Owner CHINA PETROLEUM & CHEM CORP
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