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Catalyst system of chloroethylene prepared by hydrochlorinating acetylene and preparation method and application thereof

A technology for producing vinyl chloride by chlorination and hydrochlorination of acetylene, which is applied in the direction of organic compound/hydride/coordination complex catalyst, physical/chemical process catalyst, hydrogen halide addition preparation, etc., and can solve the problem of increasing cooling equipment, easy Cause fire, solvent loss and other problems, to achieve the effect of improving conversion rate, good chemical stability, and inhibiting volatilization

Active Publication Date: 2010-06-02
于志勇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The reaction temperature of acetylene hydrochlorination is relatively high, usually 150-180°C in industry, and these patents use common organic solvents or water as the catalyst dispersion system, and some solvents have low boiling points, such as water and ethanol; Severe volatilization at high temperature causes loss of solvent, requires additional cooling equipment, increases cost, limits the choice of reaction temperature, and causes environmental pollution
In addition, once the organic solvent leaks, the pollution will be serious and it will easily cause fire.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of catalyst system:

[0029] Dissolve 3.1928g of copper chloride in 28.1577g of 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) ionic liquid, the concentration of copper chloride is 0.54mol / L, at a temperature of 100°C oil Dissolve in the bath for 1h.

[0030] (2) Hydrochlorination of acetylene:

[0031] The above-mentioned catalyst system is directly used in the reaction of acetylene hydrochlorination to generate vinyl chloride, and the molar ratio of reaction gas distribution is C 2 h 2 / HCl=1 / 1.7, space velocity 14mL / mL·h, reaction at 150°C, hydrogen chloride activation time 1.5h. Analysis of the reaction tail gas shows that the conversion rate of acetylene is 35-40%, and the selectivity of vinyl chloride is greater than 99%.

[0032] The catalyst system was weighed after the reaction with no mass loss. The catalyst system has almost no vapor pressure, is non-volatile, colorless, and odorless, has a large stable temperature range, and has good ch...

Embodiment 2

[0034] (1) Preparation of catalyst system:

[0035] 3.2308g of cuprous chloride was dissolved in 22.9236g of 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) ionic liquid, and the concentration of cuprous chloride was 0.92mol / L. Dissolve in an oil bath at a temperature of 120°C for 2h.

[0036] (2) Hydrochlorination of acetylene:

[0037] The catalyst system prepared by the above steps is used in the reaction of acetylene hydrochlorination to generate vinyl chloride, and the molar ratio of reaction gas distribution is C 2 h 2 / HCl=1 / 1.43, space velocity 19mL / mL·h, reaction at 160°C, hydrogen chloride activation time 1.1h. Analysis of the reaction tail gas shows that the conversion rate of acetylene is 25-35%, and the selectivity of vinyl chloride is greater than 99%.

[0038] The catalyst system was weighed after the reaction with no mass loss. The catalyst system has almost no vapor pressure, is non-volatile, colorless, and odorless, has a large stable temperature range, ...

Embodiment 3

[0040] (1) Preparation of catalyst system:

[0041] 1 g of platinum tetrachloride was dissolved in 31.3710 g of 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) ionic liquid, and the concentration of platinum tetrachloride was 0.039 mol / L. Dissolve in an oil bath at a temperature of 120°C for 2h.

[0042] (2) Hydrochlorination of acetylene

[0043] The catalyst system prepared by the above steps is used in the reaction of acetylene hydrochlorination to generate vinyl chloride, and the molar ratio of reaction gas distribution is C 2 h 2 / HCl=1 / 1.2, the space velocity is 6.8mL / mL·h, the reaction is carried out at 170°C, and the activation time of hydrogen chloride is 1h. Analysis of the reaction tail gas shows that the conversion rate of acetylene is 55-60%, and the selectivity of vinyl chloride is greater than 99%.

[0044] The catalyst system was weighed after the reaction with no mass loss. The catalyst system has almost no vapor pressure, is non-volatile, colorless, and o...

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PUM

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Abstract

The invention discloses a catalyst system of chloroethylene prepared by hydrochlorinating acetylene and a preparation method and application thereof. The catalyst system comprises a catalyst carrier and a catalyst, wherein the catalyst carrier is imidazole ion liquid and the catalyst is any combination of one or more of gold, platinum, palladium, tin, mercury, copper or rhodium chlorides. The preparation method of the catalyst system is to dissolve the catalyst into the catalyst carrier. Acetylene and chlorine hydride are mixed and react in the presence of the catalyst system. The preparation process realizes a liquid phase reaction for preparing chloroethylene by hydrochlorinating acetylene, avoids the loss of the catalyst system, is more environment-friendly and safer, and improves the conversion rate of the acetylene and the selectivity of the chloroethylene.

Description

technical field [0001] The invention relates to a catalyst system for preparing vinyl chloride by hydrochlorination of acetylene and its preparation and application. Background technique [0002] Vinyl chloride monomer is an important organic synthetic chemical raw material for the production of polyvinyl chloride, which is an important variety of plastics. Acetylene hydrochlorination is an important chemical process for the industrial synthesis of vinyl chloride, and the vast majority of polyvinyl chloride raw materials in my country are produced through this reaction. At present, the catalyst used in this reaction is a mercuric chloride catalyst supported on activated carbon, and the reaction is a gas-solid reaction. The catalytic reaction carried out in a fixed bed has the characteristics of high catalytic activity, fast reaction speed and violent reaction. However, the reaction zone is relatively narrow (usually 0.15m ~ 0.7m), the reaction heat is difficult to take away...

Claims

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Application Information

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IPC IPC(8): B01J31/30B01J31/26C07C21/06C07C17/08
CPCB01J31/0284B01J31/26C07C17/08B01J31/30
Inventor 于志勇
Owner 于志勇
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