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

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

CN1903435AActive Publication Date: 2007-01-31CHINA PETROCHEMICAL CORP +2
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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

Patent Timeline
31 Jan 2007
Publication
CN1903435A
IPC
B01J31/12; B01J27/236; C07C69/15; C07C67/04
Inventors
冯良荣; 张仁文