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Chloroethylene preparation method by catalytic cracking by barium chloride catalyst

A technology of catalytic cracking and vinyl chloride, applied in the direction of physical/chemical process catalysts, dehydrohalogenation preparation, chemical instruments and methods, etc., can solve the problems of easy coking of furnace tubes, short production cycle, high energy consumption, etc., and achieve stable life, Lower operating costs, better selectivity

Inactive Publication Date: 2012-11-07
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The traditional thermal cracking process of ethylene method needs high temperature of 500℃~600℃, and the conversion rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example 1

[0028] The activated carbon-barium chloride catalyst with the weight content of barium chloride of 1% was loaded into the fixed-bed reactor, and dichloroethane was introduced into the constant flow pump, and the space velocity was 700h -1 The average reaction temperature is 250°C. After the reaction product is cooled to -17°C, the unreacted dichloroethane liquid in the liquid phase is separated first, and then the hydrogen chloride and liquid vinyl chloride liquid are mainly obtained through separation.

[0029] The single-pass conversion rate of dichloroethane is 7%, and the selectivity of vinyl chloride is over 99%.

[0030] The activated carbon-barium chloride catalyst with a barium chloride content of 1% by weight is prepared as follows:

[0031] Activated carbon is pretreated first:

[0032] The 40 mesh cylindrical granular activated carbon is immersed in a 30% nitric acid solution by weight for 5-10 hours, and then dried in a constant temperature box at a dryin...

Example Embodiment

[0034] Example 2

[0035] The activated carbon-barium chloride catalyst with the weight content of barium chloride of 1% is loaded into the fixed-bed reactor, and dichloroethane is fed into the constant flow pump, the space velocity is 240h-1, and the average reaction temperature is 300°C. After the reaction product is cooled to -17°C, the unreacted dichloroethane liquid in the liquid phase is separated first, and then the hydrogen chloride and liquid vinyl chloride liquid are mainly obtained through separation.

[0036] The conversion rate of dichloroethane per pass is 38%, and the selectivity of vinyl chloride is over 97%.

[0037] The preparation method of the activated carbon-barium chloride catalyst is the same as in Example 1.

Example Embodiment

[0038] Example 3

[0039] The activated carbon-barium chloride catalyst containing 1% by weight of barium chloride was loaded into the fixed bed reactor, and dichloroethane was introduced into the constant flow pump at a space velocity of 80h -1 The average reaction temperature is 350℃. After the reaction product is cooled to -18°C, the liquid phase unreacted dichloroethane liquid is separated first, and then the hydrogen chloride and liquid vinyl chloride liquid are mainly obtained after separation.

[0040] The single-pass conversion rate of dichloroethane is 44%, and the selectivity of vinyl chloride is over 95%.

[0041] The preparation method of the activated carbon-barium chloride catalyst is the same as in Example 1.

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PUM

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Abstract

The invention discloses a chloroethylene preparation method by catalytic cracking by a barium chloride catalyst. The method comprises the following steps: introducing dichloroethane into a fixed bed reactor with an active carbon-barium chloride catalyst; and separating the reaction products to obtain products of hydrogen chloride and liquid chlorine ethylene. Compared with an existing chloroethylene preparation method, the method provided by the invention has the following obvious merits: the invention solves problems of low conversion rate, poor selectivity and high energy consumption of dichloroethane high temperature pyrolysis, and greatly reduces operating costs for the subsequent dichloroethane recovery and rectification separation. The efficient activated carbon catalyst has stable life, good selectivity and low price, and can be effectively used in industrial production. Therefore, the invention is a highly efficient, energy-saving and emission-reduced technology.

Description

technical field [0001] The invention relates to a method for preparing vinyl chloride, in particular to a method for preparing vinyl chloride by gas-phase catalytic cracking of ethylene dichloride. Background technique [0002] Vinyl chloride monomer (VCM) is a basic chemical raw material with a wide range of applications. The current industrial methods for producing vinyl chloride monomer mainly include the acetylene method based on the coal chemical route and the ethylene method based on the petrochemical route. [0003] Acetylene method: Firstly, calcium carbide is produced from quicklime and coke-based carbon raw materials, and then calcium carbide is used to react with water to produce acetylene, and acetylene reacts with hydrogen chloride to form vinyl chloride. The reaction is: [0004] (1) CaO+3C→CaC 2 +CO [0005] (2)CaC 2 +H 2 O→Ca(OH) 2 +HC≡CH [0006] (3) HC≡CH+HCl→H 2 C≡CHCl [0007] The acetylene method has a simple process and a high conversion rate; ...

Claims

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Application Information

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IPC IPC(8): C07C21/06C07C17/25B01J27/138
Inventor 袁向前宋宏宇汪涛冯大龙钟瑛王越田宇江孝平吴同曹松
Owner EAST CHINA UNIV OF SCI & TECH
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