Method for preparing vinyl chloride through catalyzing acetylene and dichloroethane

A technology for acetylene dichloroethane and dichloroethane, which is applied in the field of vinyl chloride preparation technology, can solve problems such as environmental pollution, and achieve the effects of avoiding complex equipment, high acetylene conversion rate, and solving mercury pollution problems.

Active Publication Date: 2015-02-04
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a process for preparing vinyl chloride by catalyzing the reaction of acetylene and ethylene dichloride, and solve the technical problem that the acetylene process generally uses a loaded mercuric chloride catalyst in the prior art and causes serious environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Dissolve 5g of strontium chloride and 7.5g of cyanoacetamide in 200ml of deionized water to prepare an impregnation solution. Add 100g of coal-based activated carbon treated with hydrochloric acid, mix evenly, impregnate for 4 hours, and activate with nitrogen at 650°C for 6 hours to prepare a nitrogen-modified catalyst. Mix acetylene and ethylene dichloride vapor at a ratio of 1:1.2, and pass it into the fixed-bed reactor equipped with the prepared nitrogen-modified catalyst for reaction, and the reaction space velocity is 42h -1 , the reaction temperature is controlled at 260°C, the reacted gas is cooled to room temperature, the liquid unreacted dichloroethane is separated first, and then the remaining gas is frozen and compressed to obtain liquid vinyl chloride. Calculated by acetylene, the primary conversion rate is over 80%, and the selectivity of vinyl chloride is over 90%.

Embodiment 2

[0018] Dissolve 5g of strontium chloride and 7.5g of cyanoacetamide in 200ml of deionized water to prepare an impregnation solution. Add 100 g of coal-based activated carbon treated with hydrochloric acid, mix well, impregnate for 6 hours, and activate with nitrogen at 650°C for 6 hours to prepare a nitrogen-modified catalyst. Mix acetylene and ethylene dichloride vapor at a ratio of 1:1.2, and pass it into the fixed-bed reactor equipped with the prepared nitrogen-modified catalyst for reaction, and the reaction space velocity is 42h -1 , the reaction temperature is controlled at 240°C, the reacted gas is cooled to room temperature, the liquid unreacted dichloroethane is separated first, and then the remaining gas is frozen and compressed to obtain liquid vinyl chloride. Calculated by acetylene, the primary conversion rate is over 60%, and the selectivity of vinyl chloride is over 90%.

Embodiment 3

[0020] Dissolve 2g of strontium chloride and 5g of acrylamide in 100ml of deionized water to prepare an impregnation solution. Add 50 g of coal-based activated carbon treated with hydrochloric acid, mix well, impregnate at room temperature for 12 hours, and activate with nitrogen at 600°C for 6 hours to prepare a nitrogen-modified catalyst. Mix acetylene and ethylene dichloride vapor at a ratio of 1:1.1, and pass it into the fixed-bed reactor equipped with the prepared nitrogen-modified catalyst for reaction, and the reaction space velocity is 42h -1 , the reaction temperature is controlled at 260°C, the reacted gas is cooled to room temperature, the liquid unreacted dichloroethane is separated first, and then the remaining gas is frozen and compressed to obtain liquid vinyl chloride. Calculated by acetylene, the primary conversion rate is over 80%, and the selectivity of vinyl chloride is over 90%.

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PUM

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Abstract

The invention discloses a method for preparing vinyl chloride through catalyzing acetylene and dichloroethane to react. The method comprises the steps: mixing acetylene and dichloroethane steam according to a molar ratio of 1:1-1:4, then introducing into a fixed bed reactor provided with a nitrogen modified catalyst, and carrying out a reaction with the reaction temperature of 180-300 DEG C and the air speed of 20-120 h<-1>. The nitrogen modified catalyst takes active carbon as a carrier, and is loaded with a metal salt compound and a nitrogen-containing compound; based on the total mass of the catalyst, the mass percentage of the metal salt compound is 0.01-10%, and the mass percentage of the nitrogen-containing compound is 0.01-10%. Vinyl chloride prepared by the method has the characteristics of high acetylene conversion rate and high vinyl chloride selectivity; and the nitrogen modified catalyst preparation process adopted in the process method is simple, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of vinyl chloride preparation technology, and in particular relates to a method for preparing vinyl chloride by catalyzing acetylene dichloroethane. Background technique [0002] Vinyl chloride is a very important chemical raw material, mainly used in the production of polyvinyl chloride resin. Polyvinyl chloride is one of the top five engineering plastics in the world and is widely used in various industries. At present, the industrial synthesis methods of vinyl chloride monomer mainly include acetylene hydrochlorination and ethylene oxychlorination. The ethylene oxychlorination method uses ethylene, hydrogen chloride and oxygen to carry out oxychlorination reaction or chlorination of ethylene to generate dichloroethane, and thermal cracking of dichloroethane to generate vinyl chloride, while producing hydrogen chloride as a by-product. Acetylene hydrochlorination is a method in which acetylene and hydrog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C21/06C07C17/25C07C17/08B01J27/24
Inventor 姜标王雯娟沈兆兵
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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