Process for synthesizing vinyl acetate catalyst through acetylene method

A vinyl acetate and catalyst technology, applied in the field of catalyst preparation, can solve problems such as long drying time, and achieve the effects of improving load capacity, inhibiting crystallization behavior, and avoiding blockage of micropores

Active Publication Date: 2013-05-22
PUJING CHEM IND SHA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, the activated carbon after nitric acid treatment needs to be washed and extracted for a long time to make the activated carbon neutral, and the drying time is long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The activated carbon particles used as the carrier are cylindrical, with a diameter of about 2mm and a length of 2-5mm. Take volume 2m 3 The coal-based activated carbon weighs 830kg after drying at 210°C for 2 hours, 3 After impregnating the activated carbon with 30wt% zinc acetate solution at 30°C for 145min, it was dried with nitrogen gas at 210°C in an impregnation tower. It was found that there were a few zinc acetate crystals on the surface of the catalyst activated carbon particles. With the catalyst prepared by the above method, at the reaction temperature of 175°C, the ratio of acetylene acetate to 6:1, and the space velocity at 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 38.3%.

Embodiment 2

[0028] The activated carbon particles used as the carrier are cylindrical, with a diameter of about 2mm and a length of 2-5mm. Take volume 2m 3 The coal-based activated carbon weighs 830kg after drying at 210°C for 2 hours, 3 After impregnating the activated carbon with 35wt% zinc acetate solution at 30°C for 145min, it was dried with nitrogen gas at 210°C in an impregnation tower. A large number of zinc acetate crystals were found on the surface of the catalyst zinc acetate. Get the catalyst particles, separate the outer layer and the inner layer, and do X-ray diffraction analysis after crushing, and find that the outer layer and the inner layer have higher zinc acetate crystal diffraction peaks. With the catalyst prepared by the above method, at the reaction temperature of 175°C, the ratio of acetylene acetate to 6:1, and the space velocity at 300m 3 h -1 synthesis of vinyl acetate under these conditions. The product is analyzed by chromatography, and the mass percenta...

Embodiment 3

[0030] The activated carbon particles used as the carrier are cylindrical, with a diameter of about 2mm and a length of 2-5mm. Take volume 2m 3 The coal-based activated carbon weighs 830kg after drying at 210°C for 2 hours, 335wt% zinc acetate solution impregnated the treated activated carbon at 30°C for 145min, then set two graphite electrodes at a distance of 2m in the vertical direction in the drying tower, one end of the graphite electrode was inserted into the impregnated activated carbon, and the other end of the two graphite electrodes was A voltage is applied to heat and dry the impregnated activated carbon. It was found that there was a small amount of white powdery zinc acetate on the surface of the catalyst zinc acetate. Take the catalyst particles, separate the outer layer and the inner layer, and do X-ray diffraction analysis after pulverization, and find that the diffraction peaks of the outer layer and the inner layer zinc acetate crystals are not obvious. Wi...

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Abstract

The invention relates to a process for synthesizing vinyl acetate catalyst through an acetylene method. The process which treats active carbon as a carrier and zinc acetate as an active component comprises the following steps: adding zinc acetate to water to prepare an aqueous solution of the active component, immersing active carbon in the aqueous solution of the active component to make the zinc acetate component be dipped on the active carbon, drying the dipped active carbon in a drying tower to obtain the acetylene method vinyl acetate catalyst, galvanizing the dipped active carbon in the drying tower to heat the active carbon in order to complete the drying of the catalyst. Compared with the prior art, the process provided in the invention has the advantages of high activity, long life and the like.

Description

technical field [0001] The invention belongs to the technical field of catalytic chemistry and basic organic chemical synthesis, and uses acetylene and acetic acid as main raw materials to prepare a catalyst for synthesizing vinyl acetate. 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 great significance to develop high-efficiency catalysts for the acetylene ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/04B01J31/28B01J31/26B01J37/34C07C67/04C07C69/15
Inventor 计扬毕永胜冯良荣甘亚邓成利
Owner PUJING CHEM IND SHA
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