Ultralow-mercury catalyst used for acetylene hydrochlorination

Abstract

The invention discloses an ultralow-mercury catalyst, and particularly relates to a catalyst with the ultralow content of mercuric chloride and suitable for acetylene hydrochlorination to synthesize chloroethylene. The catalyst comprises a main activity component, auxiliary component A metal bromide, auxiliary component B metal bromide and carriers, wherein the main activity component is mercuric chloride, and the content of the mercuric chloride accounts for 0.5-4% of the total mass of the catalyst carriers; the auxiliary component A metal bromide includes one or more of cupric bromide, cobaltous bromide, manganous bromide, nickel bromide and zinc bromide, and the metal element content of the auxiliary component A metal bromide accounts for 0.1-15% of the total mass of the catalyst carriers; the auxiliary component B metal bromide includes one or more of potassium bromide, barium bromide, sodium bromide and lithium bromide, and the metal element content of the auxiliary component B metal bromide accounts for 0.01-10% of the total mass of the catalyst carriers; the carriers include activated carbon with the specific surface area of 300-2500 m<2> / g and molecular sieve, or silica gel, or zeolite or kieselguhr. While activity and stability of the ultralow-mercury catalyst are ensured, the mercury resource in the catalyst is brought into full play to reach the maximum use efficiency, and the novel ultralow-mercury catalyst is environmentally friendly.

Description

technical field [0001] The invention relates to a catalyst, in particular to an ultra-low mercury catalyst for acetylene hydrochlorination. Background technique [0002] Polyvinyl chloride is one of the five major synthetic resins in the world, and is widely used in important fields of the national economy such as industry, agriculture, and building materials. Vinyl chloride monomer is an important raw material for organic chemical synthesis, and its main purpose is to produce polyvinyl chloride and other vinyl chloride copolymers. The main synthesis methods of vinyl chloride are calcium carbide acetylene method, petroleum ethylene method and dichloroethane cracking method. Calcium carbide polyvinyl chloride is the mainstream process route for producing PVC in China. In the process of synthesizing vinyl chloride, mercury chloride is the main active component of the catalyst. Mercury chloride is volatile and is a highly toxic substance, which is harmful to the environment an...

AI Technical Summary

Problems solved by technology

Although the activity of the above-mentioned ultra-low mercury catalyst can meet the production requirements, the stability still needs to be improved and optimized, so it is not enough for large-scale industrial application