Method for preparing vinyl chloride and coproducing dichloroethylene and 1,1,2-trichloroethane by acetylene-dichloromethane coupled reaction

Abstract

The invention relates to a method for preparing vinyl chloride and coproducing dichloroethylene and 1,1,2-trichloroethane by acetylene-dichloromethane coupled reaction, which is characterized by comprising the following steps: mixing acetylene and dichloromethane, and simultaneously carrying out dichloromethane coupled reaction and acetylene hydrochlorination on the acetylene and dichloromethane in a catalyst-filled reactor under the action of the catalyst, wherein the mole ratio of the acetylene to the dichloromethane is 0.5-2.5, the reaction temperature is 200-400 DEG C, the volumetric space velocity of the acetylene-dichloromethane gas mixture is 10-500 h<-1>, and the dichloromethane coupled reaction generates dichloroethylene, 1,1,2-trichloroethane and chlorine hydride; and further carrying out acetylene hydrochlorination on the generated chlorine hydride and acetylene to generate vinyl chloride. The method can simultaneously coproduce the dichloroethylene, 1,1,2-trichloroethane and other high-added-value products while producing vinyl chloride, and the process is more economical and has wider industrialization prospects.

Description

technical field [0001] The present invention relates to a method for preparing vinyl chloride (i.e. monochlorethylene) to co-produce dichloroethylene (including 1,1-dichloroethylene, cis-1,2-dichloroethylene, trans-1,2-dichloroethylene) and The method for 1,1,2-trichloroethane belongs to the technical field of vinyl chloride monomer preparation. Background technique [0002] As one of the five general-purpose plastics, PVC plays an important role in national economic construction and is widely used in various industries such as automobiles, building materials, pipes, wires and cables, toys, and food packaging. In 2011, the apparent consumption of five general-purpose plastics in my country exceeded 50 million tons, of which PVC accounted for about 14 million tons. Due to the constraints of our country's resource structure, compared with the petroleum ethylene method, the traditional process of coal-calcium carbide-acetylene is more suitable for the development of the domest...

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Problems solved by technology

[0004] Liu Huijuan of Sichuan University and others put forward the idea of ​​obtaining vinyl chloride through the coupling reaction between methane chlorides in the article "New Technology for Catalytic Coupling of Methane Chlorides to Synthesize Vinyl Chloride Monomers", and then obtained the feasibility of this reaction through thermodynamic analysis. and has been verified by laboratory research, but the experimental results show that the conversion rate and the selectivity of vinyl chloride are not high

[0006] In addition, there are few reports on the catalytic coupling of acetylene and dichloromethane to prepare vinyl chloride, dichloroethylene and 1,1,2-trichloroethane.

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