Catalyst for producing vinyl acetate by acetylene method and preparation method and use thereof

A vinyl acetate and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., can solve the problems of low production capacity, high reaction temperature and high cost , to achieve the effect of good catalytic performance, good mechanical strength and easy loading

Inactive Publication Date: 2009-03-18
JIANGSU SOPO GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The catalyst used in the synthesis of vinyl acetate by acetylene vapor phase method is Zn(CH 3 COO) 2 /C, an important disadvantage of this catalyst is that the production capacity is not high
In order to improve the production capacity of the catalyst, scholars at home and abroad have done a lot of research work, mainly focusing on the research and development of catalyst active components with high activity. For example, Japanese scholars have proposed a two-component oxide (V 2 o 5 -ZnO and Fe 2 o 3 ) or three-component oxide (16ZnO·32Fe 2 o 3 ·V 2 o 5 ) as the active component of the catalyst, although at 250 °C has a higher 3 COO) 2 The production capacity of /C catalyst, but i

Method used

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  • Catalyst for producing vinyl acetate by acetylene method and preparation method and use thereof
  • Catalyst for producing vinyl acetate by acetylene method and preparation method and use thereof
  • Catalyst for producing vinyl acetate by acetylene method and preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0012] Example 1:

[0013] Acrylonitrile and vinylidene chloride were distilled to remove the polymerization inhibitor to obtain monomers, and the molar ratio of acrylonitrile and vinylidene chloride was 1.5:10. The initiator is azobisisoheptonitrile, and the amount is 1-2% (molar ratio) of the monomer amount. The copolymer pellets are obtained by suspension polymerization. The particle size of the polymer pellets is controlled by adjusting the stirring speed. The polymerization temperature is 40℃, polymerization time is 24 hours. After the reaction, the pellets are repeatedly washed with boiling water to remove the dispersant. The polymer pellets are put into a quartz tube, and the temperature is gradually raised to 1000℃ under the protection of argon and kept at 1 -3 hours to obtain the copolymer-derived carbon pellet catalyst carrier. The above method is used to obtain carbon pellet carriers with different ratios of acrylonitrile and vinylidene chloride.

Example Embodiment

[0014] Example 2:

[0015] Weigh 30 g of the derivatized carbon prepared in Example 1, and calculate the amount of mixed solution required for impregnation. Weigh 1.92g Zn(CH 3 COO) 2 ·2H 2 O was dissolved in a mixed solvent of methanol and water, zinc acetate was loaded on the derivatized carbon by an equal volume impregnation method, and after drying, a catalyst for the production of vinyl acetate with a zinc acetate loading of 5% was obtained.

[0016] Using the above method, catalysts with different zinc acetate loadings were prepared.

Example Embodiment

[0017] Example 3

[0018] 20g of catalysts with different loadings of zinc acetate were loaded into the fixed bed reactor. The heating medium of the reactor is heat-conducting silicone oil. Acetylene comes from a steel cylinder, and acetic acid is pumped in by a metering pump. The reaction products are collected in the condenser and analyzed quantitatively by chromatography. By changing the reaction temperature and the space velocity of the gas, the reaction results under different reaction conditions are obtained, as shown in Table 1.

[0019] Table 1 Catalytic reaction results of the catalyst with a zinc acetate loading of 5wt%

[0020]

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Abstract

The invention discloses a catalyst used for producing vinyl acetate by an acetylene method, a preparation method used for the catalyst and the application of the catalyst. The catalyst takes polymer derivative carbon as carrier; the active component of the catalyst is zinc acetate; the loading quantity of the zinc acetate in the catalyst is 5-35%; the former body of the derivative carbon is resin microsphere by copolymerization of acrylonitrile and vinylidene chloride; the monomer molar proportion of acrylonitrile and vinylidene chloride is 1:10-3:10. The catalyst has excellent mechanical strength, has good comprehensive performance in the catalytic reaction and the better reaction temperature is 160-220 DEG C.

Description

Technical field: [0001] The invention belongs to the field of chemical production, and in particular relates to a catalyst for producing vinyl acetate by using acetic acid and acetylene gas, its preparation method and specific application. Background technique: [0002] Vinyl acetate (VAc) is one of the organic chemical raw materials with the largest output in the world. As an important organic chemical raw material, it is mainly used to produce polyvinyl acetate (PVAc), polyvinyl alcohol (PVA), ethylene-vinyl acetate copolymer (VAE ), vinyl chloride-vinyl acetate copolymer (EVC), polyacrylonitrile comonomer and other derivatives, these derivatives have a wide range of uses, and can be used in coatings, pastes, adhesives, vinylon, films, vinyl copolymer resins , Acetal resin and other chemical products, with the advancement of science and technology, new application fields are still expanding. [0003] In 1922, Muqaen of Germany discovered that zinc acetate catalyst impregn...

Claims

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Application Information

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IPC IPC(8): B01J31/04C07C69/15B01J21/18
Inventor 邵守言袁国卿凌晨闫芳曹宏兵钱庆利
Owner JIANGSU SOPO GRP
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