Mercury-free catalyst for acetylene hydrochlorination

Abstract

The invention discloses a mercury-free catalyst and especially relates to a mercury-free catalyst for acetylene hydrochlorination synthesis of vinyl chloride. The mercury-free catalyst comprises a composite carrier composed of active carbon and a metal oxide, and at least one of cobalt, manganese, copper, zinc, bismuth, barium and potassium as active ingredients. The mercury-free catalyst utilizes the composite carrier composed of active carbon and metal oxide, has dual properties of active carbon carriers and metal oxide carriers and has high acetylene hydrochlorination catalytic activity. Through interaction of the composite carrier and the active ingredient, the catalyst can produce weak and fast chemisorption of hydrogen chloride (as acetylene hydrochlorination raw material gas) so that the mercury-free catalyst for acetylene hydrochlorination is obtained. Through special properties of the composite carrier and special action of the active ingredient and the composite carrier, the catalyst has high reaction activity and is a novel mercury-free catalyst with good activity, strong stability and high selectivity. The mercury-free catalyst has the advantages of simple production processes, short production period and low production cost.

Description

technical field [0001] The invention relates to a catalyst, in particular to a non-mercury catalyst for acetylene hydrochlorination. Background technique [0002] Polyvinyl chloride is one of the five major synthetic resins in the world, widely used in important areas of the national economy such as industry, agriculture, and building materials. Vinyl chloride monomer is an important raw material for organic chemical synthesis. Its main purpose is to produce polyvinyl chloride resin and other vinyl chloride copolymers. With the development of social economy, its demand is increasing day by day. The sources of vinyl chloride mainly include calcium carbide acetylene method, petroleum ethylene method and dichloroethane cracking method. my country's energy structure of "short of oil, poor in gas, and rich in coal" determines that the production of polyvinyl chloride by calcium carbide acetylene has become the mainstream. [0003] The catalyst used in industry is a mercury cata...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a non-mercury catalyst for acetylene hydrochlorination, which solves the problem of using a highly toxic mercury catalyst in the production of polyvinyl chloride by calcium carbide acetylene method under relatively economical conditions, which leads to large consumption of mercury in production and serious environmental pollution. , the problem of poor dispersibility and poor stability of existing precious metal catalysts, and then provides a non-mercury catalyst with high dispersibility of catalyst active components, good catalytic activity, high selectivity and good stability