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A kind of preparation method of efficient catalyst for synthesizing vinyl acetate by acetylene method

A vinyl acetate and catalyst technology, which is applied in the field of high-efficiency catalysts for the synthesis of vinyl acetate by the acetylene method, and can solve problems such as long drying time

Inactive Publication Date: 2011-12-21
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the gac after the nitric acid treatment in the method needs to wash for a long time, extract to make the gac to neutral, and the drying time is long, which is different from that of the present invention.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take a coal-based activated carbon with a volume of 100ml and weigh 41.75g, impregnate the treated activated carbon with 100ml of 30wt% zinc acetate solution at 80°C for 45min, take it out, filter it with suction, and dry it. The catalyst prepared by the above method has a reaction temperature of 175°C and a space velocity of 300m 3 h -1 synthesis of vinyl acetate under these conditions. The product is analyzed by chromatography, and the mass percentage of vinyl acetate in the product is 38%.

Embodiment 2

[0019] Get the coal-based active carbon weight 41.75g ​​of volume 100ml, use equal volume of 15%wt H 2 o 2 Activated carbon was treated for 2 h under the condition of heating in a water bath at 60 °C. The treated activated carbon was suction filtered, and the microwave power was 250W, and dried for 5 minutes. After impregnating the treated activated carbon with 100ml of 30wt% zinc acetate solution at 80°C for 45min, take it out for suction filtration and dry. The catalyst prepared by the above method has a reaction temperature of 175°C and a space velocity of 300m 3 h -1 synthesis of vinyl acetate under these conditions. The product is analyzed by chromatography, and the mass percentage of vinyl acetate in the product is 48%.

Embodiment 3

[0021] Take the coconut shell activated carbon weighing 38.66g of volume 100ml, place in quartz tube. The quartz tube is placed in a tube furnace, and the flow rate is 100ml / min of ozone and nitrogen mixed gas with a volume ratio of 1:1. Tube furnace temperature 100 ℃ for 4h. Activated carbon was cooled to room temperature and set aside. Impregnate the treated activated carbon with 100ml of 20wt% zinc acetate solution at 75°C for 75min, suction filter and dry. The catalyst prepared by the above method has a reaction temperature of 175°C and a space velocity of 300m 3 h -1 synthesis of vinyl acetate under these conditions. The product is analyzed by chromatography, and the mass percentage of vinyl acetate in the product is 44%.

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Abstract

The invention provides a preparation method of a high-efficiency catalyst for synthesizing vinyl acetate by an acetylene method. The oxidant is used to oxidize the surface of activated carbon used as a catalyst carrier to change the oxygen-containing functional groups on the surface of the activated carbon and improve its original pore structure, thereby effectively improving the loading capacity of the active component zinc acetate and significantly improving the catalyst efficiency. The invention has the advantages of cheap and easy-to-obtain raw materials, simple operation, high loading capacity of catalyst active components, good activity and long service life.

Description

technical field [0001] The invention belongs to the technical field of catalytic chemistry and basic organic chemical synthesis, in particular to a cheap and easy-to-obtain high-efficiency catalyst for synthesizing vinyl acetate by acetylene method without changing the original process and reaction conditions. Background technique [0002] Vinyl acetate, also known as vinyl acetate, or VAc for short, is an important organic chemical raw material and one of the 50 largest chemical products in the world. At present, there are two main technologies for producing vinyl acetate: ethylene gas phase method and acetylene gas phase method. In areas rich in calcium carbide resources, natural gas resources and hydropower resources, especially in areas with preferential hydropower during flood peak periods, the acetylene gas phase method is highly competitive due to its advantages in raw materials, sufficient energy and low cost; especially in today's soaring oil prices , it is of grea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/04B01J37/12C07C69/15C07C67/04
Inventor 侯春燕吴永忠李子建张仁文李苹汪清泉冯良荣陈涛
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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