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Method for preparing trichloroethylene from dichloromethane

A technology of dichloromethane and trichloroethylene, which is applied in the field of preparation of trichloroethylene, can solve the problems of not clearly pointing out trichloroethylene, extrusion of profit space, high energy consumption of calcium carbide, etc., so as to avoid high energy consumption and high pollution problems, reduced production costs, and the effect of high flexibility

Active Publication Date: 2017-01-11
YIBIN TIANYUAN GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the acetylene raw material used in this method mainly comes from calcium carbide, and there are still some problems in terms of environmental protection and economy: on the one hand, there are high energy consumption and high pollution problems in the production process of calcium carbide; A large amount of calcium carbide slag will be produced in the process, although the carbide slag can be made into cement for sale, but in the current situation of severe excess cement production capacity in China, its profit margin has been greatly squeezed
It is worth noting that although alkaline earth metal oxides and rare earth metal oxides have methane oxidative coupling reaction activity, the catalyst components used in this patent do not contain these two types of compounds
In addition, although the patent pointed out that the methyl halide it uses contains at least one halogen atom but is not limited to one, and the resulting product is a halocarbon hydride with a carbon number of 2 or more, but the patent does not clearly point out the use of methane chloride Trichloroethylene can be obtained

Method used

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  • Method for preparing trichloroethylene from dichloromethane
  • Method for preparing trichloroethylene from dichloromethane

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Experimental program
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Effect test

Embodiment 1

[0055] Mix dichloromethane (gasified by heating) and oxygen at a molar ratio of 1:0.5, pass them into a reactor without catalyst, and react at 600°C and 1 atm. The reaction effluent was lowered in temperature, washed with water and alkali to remove hydrogen chloride, and analyzed for composition. It was calculated that the conversion rate of dichloromethane was about 2%, the selectivity of trichloroethylene (containing tetrachloroethane) was about 27%, and the selectivity of tetrachloroethylene was about 2%. (Containing pentachloroethane and hexachloroethane) the selectivity is about 3%, the selectivity of chloroform is about 52%, and the selectivity of 1,2-dichloroethylene is about 12%.

Embodiment 2

[0057] Make the strontium precursor compound into an aqueous solution, add silica gel and stir evenly, then dry and roast to obtain the catalyst, mix dichloromethane (heated to vaporize) and oxygen at a molar ratio of 1:0.5, and pass through the In the reactor, react at 600 DEG C, 1atm, the reaction effluent is cooled down, washed with water and alkali to remove hydrogen chloride, and analyzed for composition. It is calculated that the conversion rate of dichloromethane is about 35%, trichloroethylene (containing tetrachloride) Chloroethane) selectivity is about 45%, tetrachlorethylene (including pentachloroethane and hexachloroethane) selectivity is about 5%, trichloromethane selectivity is about 40%, 1,2-dichloroethylene The selectivity is about 8%.

Embodiment 3

[0059] Make the precursor compound of strontium and tungsten into an aqueous solution, add silica gel and stir evenly, then dry and roast to obtain the catalyst, mix dichloromethane (gasified by heating) and oxygen according to the molar ratio of 1:0.5, and pass it into the The reaction was carried out at 600° C. and 1 atm in a reactor with a catalyst. The reaction effluent is cooled down, washed with water and alkali to remove hydrogen chloride, and analyzed for composition. It is calculated that the conversion rate of dichloromethane is about 48%, the selectivity of trichloroethylene (containing tetrachloroethane) is about 42%, and the selectivity of tetrachloroethylene is about 48%. (Containing pentachloroethane and hexachloroethane) the selectivity is about 10%, the selectivity of chloroform is about 36%, and the selectivity of 1,2-dichloroethylene is about 7%.

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Abstract

The invention discloses a method for preparing trichloroethylene from dichloromethane. The method comprises the following steps: enabling reaction between dichloromethane and oxygen to produce trichloroethylene under the condition of the presence of a catalyst with methane oxidation coupled reaction activity, wherein the molar ratio of dichloromethane to oxygen is 1:(0.1-2); the reaction temperature of the reaction is 450-700 DEG C, and the reaction pressure is 1-10 atm. The method disclosed by the invention has high raw material conversion rate and trichloroethylene selectivity, and byproducts such as tetrachloroethylene and trichloromethane are produced simultaneously. The method disclosed by the invention has the advantages that an expensive raw material such as carbide acetylene or ethylene does not need to be used, so that the production cost of the trichloroethylene can be reduced, and the problems of high energy consumption and high pollution brought in the process of producing and using calcium carbide can be solved.

Description

technical field [0001] The invention relates to a method for preparing trichlorethylene, in particular to a method for preparing trichlorethylene by oxidative coupling reaction of methylene chloride. Background technique [0002] Trichlorethylene (TCE) is an important organochlorine product with strong dissolving power. It is mainly used in metal cleaning (degreasing thoroughly), fiber degreasing, and cleaning of electronic components in industry. Secondly, trichloroethylene can also be used as a raw material intermediate for the production of tetrachloroethylene, chloroacetic acid, dichloroacetyl chloride, octachlorodipropyl ether, HFC-134a and other products. In addition, trichlorethylene can also be used as extractant and solvent. [0003] According to the different raw materials used, the production methods of trichlorethylene mainly include acetylene method and ethylene method. [0004] According to the different dehydrochlorination methods, the acetylene method can b...

Claims

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Application Information

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IPC IPC(8): C07C21/10C07C17/269
Inventor 罗云邓敏师海波徐慧远周杰颜华孙永贵景雪娇
Owner YIBIN TIANYUAN GRP CO LTD