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Mercury-free synthetic method of chloroethylene

A synthesis method and vinyl chloride technology, which are applied in the preparation of hydrogen halide addition, dehydrohalogenation preparation, organic chemistry, etc., can solve problems such as huge environmental pollution pressure, and achieve the effect of long-term stable work.

Active Publication Date: 2013-02-06
ZHONGKE YIGONG SHANGHAI CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the continuous expansion of the production capacity of the acetylene process, it is facing huge environmental pollution pressure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Mix hydrogen chloride and acetylene as raw materials, and control the molar ratio of hydrogen chloride and acetylene to 1:1 to obtain mixed raw material gas;

[0024] 2) After preheating the mixed raw material gas to 100°C, pass it into the tube reactor loaded with carbon-supported barium salt catalyst for reaction, use water as the cooling medium, and control the temperature of the reaction bed at 130°C;

[0025] 3) Control the space velocity of the raw material mixture to 20 / h, adjust the gauge pressure of the reaction system to 0.2MPa, and analyze by gas chromatography, the conversion rate of acetylene reaches 80%;

[0026] 4) The reaction product obtained in step 3) is compressed, frozen, separated and rectified to obtain the vinyl chloride monomer meeting the polymerization requirements.

Embodiment 2

[0028] 1) Mix hydrogen chloride and acetylene as raw materials, and adjust the molar ratio of hydrogen chloride and acetylene to 1.3:1 to obtain mixed raw material gas;

[0029] 2) After preheating the mixed raw material gas to 120°C, pass it into the tube reactor loaded with carbon-supported barium salt catalyst for reaction, use water as the cooling medium, and control the temperature of the reaction bed to 150°C;

[0030] 3) Control the space velocity of the raw material mixture to 40 / h, adjust the gauge pressure of the reaction system to 0.15MPa, and analyze by gas chromatography, the conversion rate of acetylene reaches 85%;

[0031] 4) The reaction product obtained in step 3) is compressed, frozen, separated and rectified to obtain the vinyl chloride monomer meeting the polymerization requirements.

Embodiment 3

[0033] 1) Mix hydrogen chloride and acetylene as raw materials, and adjust the molar ratio of hydrogen chloride and acetylene to 0.7:1 to obtain mixed raw material gas;

[0034] 2) After preheating the mixed raw material gas to 140°C, pass it into the tube reactor loaded with carbon-supported barium salt catalyst for reaction, use water as the cooling medium, and control the temperature of the reaction bed at 180°C;

[0035] 3) Control the space velocity of the raw material mixed gas to 60 / h, adjust the gauge pressure of the reaction system to 0.1MPa, and analyze by gas chromatography, the conversion rate of hydrogen chloride reaches 90%;

[0036] 4) The reaction product obtained in step 3) is compressed, frozen, separated and rectified to obtain the vinyl chloride monomer meeting the polymerization requirements.

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Abstract

The invention relates to a mercury-free synthetic method of chloroethylene and relates to chloroethylene. The method includes at least one of hydrogen chloride or dichloroethane steam and acetylene are used as raw materials to be mixed to obtain mixed raw material gases; the mixed raw material gases are pre-heated and fed into a pipe reactor loaded with catalytic agents for reaction; the flowing speeds of the mixed raw material gases are controlled, and the pressure of a reaction system is adjusted so that the conversion rate of at least one of the mixed raw material gases reaches above 80%; andthe reaction product which is obtained from the third step is compressed, frozen, separated and rectified to obtain a chloroethylene monomer which meets polymerization requirements. According to the mercury-free synthetic method, the problem of mercury pollution in chloroethylene industry can be solved, and byproduct steam can be produced so that energy saving and consumption actions can be achieved. Simultaneously, by means of a pipe type cooling system, hot spot temperatures of a catalysis bed can be controlled in a smaller range so that long-term sable work of the catalytic agent is facilitated. The mercury-free synthetic method is capable of achieving comprehensive utilization of energy.

Description

technical field [0001] The invention relates to vinyl chloride, in particular to a mercury-free synthesis method of vinyl chloride. Background technique [0002] Polyvinyl chloride (PVC) is one of the five general-purpose plastics, and its output is second only to polyethylene (PE), ranking second in the world's plastic output, with an annual output of more than 40 million tons. [0003] The earliest synthesis method of polyvinyl chloride is the acetylene method, that is, under the catalysis of mercuric chloride, acetylene and hydrogen chloride are added to synthesize vinyl chloride, and vinyl chloride is polymerized to obtain polyvinyl chloride. Due to the use of mercuric chloride as a catalyst in this method, there is a serious problem of mercury pollution. After the process of producing ethylene from petroleum cracking matured, foreign countries switched to ethylene to produce vinyl chloride, and in the 1980s, the process of producing vinyl chloride from acetylene was ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C21/06C07C17/08C07C17/25
Inventor 钟劲光梁鹏贵
Owner ZHONGKE YIGONG SHANGHAI CHEM TECH CO LTD
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