Trichloro ethylene preparation method

A technology of trichlorethylene and tetrachloroethane, which is applied in the field of trichlorethylene preparation, can solve the problems of large equipment investment, low added value of by-product hydrochloric acid, high energy consumption, etc., to simplify the transportation process, reduce equipment investment, simplify The effect of the process

Active Publication Date: 2013-02-06
ZHONGKE YIGONG SHANGHAI CHEM TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the cracking reaction is an endothermic reaction, external heating is required, the equipment investment is large, the energy consumption is high, and the added value of the by-product hydrochloric acid is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) The tetrachloroethane is vaporized and mixed with acetylene to form a raw material mixed gas, and the molar ratio of tetrachloroethane to acetylene is controlled to be 1:1.

[0020] 2) Pass the raw material mixture into a reactor equipped with a carbon-supported barium salt catalyst for reaction, and control the temperature of the reaction at 150℃, pressure at 0.25MPa, and gas flow rate at 10h -1 , Make the conversion rate of acetylene reach 70%.

[0021] 3) Cool the reaction product of step 2) with water to room temperature, and separate the liquid and gas phase products. The liquid phase product can pass through the rectification tower to obtain the trichloroethylene product. The gas phase product can be compressed and frozen to further liquefy and separate the vinyl chloride , The uncondensed gas after compression and freezing is recycled and reused.

Embodiment 2

[0023] 1) The tetrachloroethane is vaporized and mixed with acetylene to form a raw material mixture, and the molar ratio of tetrachloroethane to acetylene is controlled to be 1:0.5.

[0024] 2) Pass the raw material mixture into a reactor equipped with a carbon-supported barium salt catalyst for reaction, and control the reaction temperature at 170℃, pressure at 0.1MPa, and gas flow rate at 20h -1 , So that the conversion rate of acetylene reaches 75%.

[0025] 3) Cool the reaction product of step 2) with water to room temperature, and separate the liquid and gas phase products. The liquid phase product can pass through the rectification tower to obtain the trichloroethylene product. The gas phase product can be compressed and frozen to further liquefy and separate the vinyl chloride , The uncondensed gas after compression and freezing is recycled and reused.

Embodiment 3

[0027] 1) The tetrachloroethane is vaporized and mixed with acetylene to form a raw material mixture, and the molar ratio of tetrachloroethane to acetylene is controlled to be 1:2.

[0028] 2) Pass the raw material mixture into a reactor equipped with a carbon-supported barium salt catalyst for reaction, and control the reaction temperature at 190℃, pressure at 0.15MPa, and gas flow rate at 30h -1 , So that the conversion rate of tetrachloroethane reaches 80%.

[0029] 3) Cool the reaction product of step 2) with water to room temperature, and separate the liquid and gas phase products. The liquid phase product can pass through the rectification tower to obtain the trichloroethylene product. The gas phase product can be compressed and frozen to further liquefy and separate the vinyl chloride , The uncondensed gas after compression and freezing is recycled and reused.

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PUM

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Abstract

A trichloro ethylene preparation method relates to chlorinated alkene. The method comprises the following steps: 1), mixing vaporized tetrachloroethane with acetylene to form a raw material mixture gas, and controlling the molar ratio of tetrachloroethane to acetylene at 1:(0.5-2); 2), pumping the raw material mixture gas into a reactor filled with a catalyst for reaction at controlled temperature, pressure and gas flow rate, so as to allow the conversion rate of acetylene or tetrachloroethane to reach more than 70 percent; and 3), cooling the reaction product obtained in the step 2 to a room temperature by water, and separating out liquid-phase product and gas-phase product, wherein the liquid-phase product passes through a rectification column to produce a trichloro ethylene product, the gas-phase product, which is subjected to compression and freezing, is adopted for further liquification separation of vinyl chloride, and the uncooled gas after the completion of compression and freezing is used for circulating and recycling. According to the method provided by the invention, tetrachloroethane is adopted to eliminate coupling between the reaction and an acetylene addition reaction so as to form intermolecular energy direct conversion; and accordingly, the energy transfer process is simplified, the reaction energy consumption is reduced, the technological process is also simplified, and the equipment investment is lower. In addition, as for by-products, vinyl chloride is higher than hydrochloric acid in additional value.

Description

Technical field [0001] The invention relates to a chlorinated olefin, in particular to a method for preparing trichloroethylene. Background technique [0002] Trichloroethylene is a common industrial organic solvent used for metal cleaning (complete degreasing) and fiber degreasing. It can be used in chemical raw materials to produce chloroacetic acid, dichloroacetyl chloride, octachlorodipropyl ether, and hexachloroethane. Products such as alkane are used as solvents and extractants in the pesticide and pharmaceutical industries. [0003] In industry, tetrachloroethane is usually used as a raw material for dehydrochlorination to synthesize trichloroethylene. The main methods are saponification and gas phase catalysis. Among them, the saponification method uses tetrachloroethane to react with lime milk to produce trichloroethylene and calcium chloride. In the gas phase catalytic method, tetrachloroethane vapor is thermally decomposed to generate trichloroethylene and hydrogen chl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C21/10C07C21/06C07C17/25C07C17/08
Inventor 江政辉钟劲光吴明
Owner ZHONGKE YIGONG SHANGHAI CHEM TECH CO LTD
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