Method for preparing chloroethylene by catalytic reforming

Abstract

The invention discloses a method for preparing chloroethylene by catalytic reforming, which relates to a method for preparing the chloroethylene. The method comprises: a step of preparing a catalyst by using active carbon as a carrier, in which a barium salt is used as a catalyst, the active carbon is used as the catalyst carrier, and the barium salt is dissolved in water, absorbed by the active carbon and dried to obtain the catalyst carried by the active carbon; and a step of synthesizing the chloroethylene, in which acetylene gas and dichloroethane vapour are mixed and introduced to a reactor containing the catalyst carried by the active carbon to react, the reaction effluent is cooled to room temperature, unreacted dichloroethane is condensed to be separated out, and the remaining gas is compressed and frozen to give liquid chloroethylene. In the invention, a mercury free catalyst is adopted, the mercury pollution of the chloroethylene production industry is eliminated, and the reaction is performed spontaneously with little energy consumption.

Description

technical field [0001] The invention relates to a method for preparing vinyl chloride, in particular to a method for preparing vinyl chloride by catalytic reforming of acetylene and ethylene dichloride. Background technique [0002] At present, the industrial production methods of vinyl chloride mainly include ethylene method and acetylene method. [0003] Ethylene method: using ethylene as raw material, chlorination reaction with chlorine to produce dichloroethane, dichloroethane is thermally decomposed to produce vinyl chloride and hydrogen chloride; hydrogen chloride and oxygen react with ethylene to produce dichloroethylene alkyl. The main reaction consists of the following 3 units: [0004] (1)CH 2 =CH 2 +Cl 2 →C 2 h 4 Cl 2 [0005] (2)C 2 h 4 Cl 2 →C 2 h 3 Cl+HCl [0006] (3) 2C 2 h 4 +O 2 +4HCl→2C 2 h 4 Cl 2 +2H 2 o [0007] Acetylene method: direct synthesis of vinyl chloride by acetylene and hydrogen chloride under the action of mercuric chlor...

AI Technical Summary

Problems solved by technology

Although the ethylene method has a long process flow, high equipment requirements, and large investment, but because of the low cost of raw materials and no mercury pollution, this method is basically adopted abroad

There are also a small number of factories in China that adopt the combined production process, that is, the hydrogen chloride obtained by the thermal decomposition of dichloroethane and acetylene is added to produce vinyl chloride. The advantage is that it avoids the complicated equipment for oxychlorination reaction, and the disadvantage is that mercury still needs to be used. Catalyst, cannot solve mercury pollution problem