Catalyst used for synthesis of vinyl acetate and its prepn. method

A vinyl acetate and catalyst technology, which is applied in the field of catalysts and preparations for fixed-bed gas-phase synthesis of vinyl acetate, can solve the problems of high labor intensity for workers, easy safety accidents, frequent replacement times, etc., and achieve reduction in public works consumption, The effect of good economic benefits, reducing production difficulty and labor intensity of workers

Active Publication Date: 2007-01-31
CHINA PETROCHEMICAL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As for the production technology of using gas-phase fixed-bed synthesis of vinyl acetate in my country, Sichuan Vinylon Factory (hereinafter referred to as Chuanwei Factory) introduced a 90,000-ton / year natural gas acetylene method fixed-bed synthesis of vinyl acetate device from France in the 1970s. , the catalyst provided by the French was initially used. This catalyst uses activated carbon as the carrier, zinc acetate as the active component, and bismuth subcarbonate as the co-catalyst. The content of zinc acetate is not higher than 26%, and the catalyst life is 110 days. , the space-time yield is 2.02t / m 3 d. It can be seen that this kind of catalyst has the defects of low activity and short life. Using this kind of catalyst, the number of replacements is frequent, the labor intensity of workers is high, the transition time is long, and safety accidents are easy to occur.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: a kind of catalyst that is used for the synthesis of vinyl acetate is characterized in that: it is carrier with gac, and zinc acetate is active component, and bismuth subcarbonate is cocatalyst, and wherein gac: zinc acetate: bismuth subcarbonate The mass ratio is 100:27-32:0.026.

[0037] The specific quality index of the above-mentioned activated carbon as a carrier: the bulk density is 410kg / m 3 , the iodine adsorption value is 1090mg / g, the strength is 95%, the ash content is 11%, and the specific surface area is 1080m 2 / g, the total adsorption pore volume is 0.68×10 -6 m 3 / g, the pore distribution (3-5nm) is 16%, and the average pore radius is 2nm.

[0038] The concrete preparation method of above-mentioned catalyst is characterized in that:

[0039](1) Preparation of zinc acetate solution: add a certain amount of primary desalted water, acetic acid, zinc oxide and bismuth subcarbonate into the preparation tank, heat to 80°C, stir in circulation...

Embodiment 2

[0044] Embodiment 2: a kind of catalyst that is used for the synthesis of vinyl acetate is characterized in that: it is carrier with gac, and zinc acetate is active component, and bismuth subcarbonate is promoter, and wherein gac: zinc acetate: bismuth subcarbonate The mass ratio is 100:33 to 35:0.026.

[0045] The specific quality index of the above-mentioned activated carbon as a carrier: the bulk density is 400kg / m 3 , the iodine adsorption value is 1143mg / g, the strength is 97%, the ash content is 7%, and the specific surface area is 1180m 2 / g, the total adsorption pore volume is 0.7×10 -6 m 3 / g, the pore distribution (3-5nm) is 16%, and the average pore radius is more than 2nm.

[0046] The process steps of preparing the catalyst are the same as in Example 1, except that the concentration of zinc acetate in the impregnation solution is 24%, the impregnation temperature is 85°C to 95°C, the impregnation time is 3.5 hours, and the adsorption capacity of the active comp...

Embodiment 3

[0048] Embodiment 3: a kind of catalyst that is used for the synthesis of vinyl acetate is characterized in that: it is carrier with gac, and zinc acetate is active component, and bismuth subcarbonate is promoter, and wherein gac: zinc acetate: bismuth subcarbonate The mass ratio is 100:36-40:0.026.

[0049] The specific quality index of the above-mentioned activated carbon as a carrier: the bulk density is 400kg / m 3 , the iodine adsorption value is 1143mg / g, the strength is 97%, the ash content is 7%, and the specific surface area is 1180m 2 / g, the total adsorption pore volume is 0.7×10 -6 m 3 / g, the pore distribution (3-5nm) is 16%, and the average pore radius is more than 2nm.

[0050] The process steps of preparing the catalyst are the same as in Example 1, except that the concentration of zinc acetate in the impregnation solution is 33%, the impregnation temperature is 90° C. to 100° C., the impregnation time is 3.5 hours, and the adsorption capacity of the active co...

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Abstract

A catalyst for synthesizing vinyl acetate from acetylene and acetic acid is prepared from activated carbon, zinc acetate and alkaline bismuth carbonate in mass ratio of 100: (27-40): 0.026 by excessive solution dipping method.

Description

technical field [0001] The invention relates to a catalyst for synthesizing vinyl acetate and a preparation method thereof, in particular to a catalyst for synthesizing vinyl acetate in a fixed bed gas phase with acetylene and acetic acid as main raw materials and a preparation method thereof. Background technique [0002] The industrial catalyst for acetylene gas-phase synthesis of vinyl acetate has always used a certain carrier to carry zinc acetate as a catalyst. In 1922, mugdan began to use charcoal to carry zinc acetate. After a lot of research, activated carbon was finally used as the carrier instead of charcoal, and activated carbon was almost used as the only catalyst carrier in industry. For example, in "Synthesis of Vinyl Acetate Catalyst Carrier, Technical Data Series 1", pages 55-71 (1976), it is introduced that North Korea adopts sawdust charcoal to support zinc acetate catalyst; Japan adopts coconut shell charcoal to support zinc acetate catalyst; currently At...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/12B01J27/236C07C69/15C07C67/04
Inventor 冯良荣张仁文邱发礼汪清泉张文英付武华吴永忠
Owner CHINA PETROCHEMICAL CORP
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