Activating and recovering method of waste mercuric chloride catalyst

Abstract

An activating and recovering method of a waste mercuric chloride catalyst is provided. The method includes: a low-temperature carbonization step, namely a step of adding the waste mercuric chloride catalyst into an activation regeneration furnace and heating to 100-200 DEG C; a step of steam activation, namely a step of feeding an activating gas into the activation regeneration furnace so as to clean micropore surfaces of the waste mercuric chloride catalyst; a step of solvent activation, namely a step of activating the waste mercuric chloride catalyst again by using a regenerating solvent so as to remove a trace amount of impurities in the waste mercuric chloride catalyst; and a step of regenerating the mercuric chloride catalyst, namely a step of dipping the waste mercuric chloride catalyst with a mercuric chloride solution. The method can effectively recover and reutilize the waste mercuric chloride catalyst. Compared with the prior art, the method is advantageous in that: on the one hand, the waste mercuric chloride catalyst is free of innocent treatment, and on the other hand, the waste mercuric chloride catalyst can be reutilized, thus effectively reducing the production cost, increasing the production efficiency and facilitating environment protection.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a catalyst activation recovery method for waste mercuric chloride. Background technique [0002] At present, polyvinyl chloride is generally prepared by the acetylene method in the industry, and in the process of preparing polyvinyl chloride by the acetylene method, mercury chloride (HgCl 2 ) as a catalyst for the reaction, namely mercuric chloride catalyst. [0003] Since acetylene gas, the reactant in the acetylene process, generally contains impurities such as hydrogen sulfide, phosphine, and moisture, after the mercury chloride catalyst is used for a period of time, the sulfur and phosphorus compounds contained in the acetylene gas will react with mercury chloride , generating non-catalytically active substances such as mercury sulfide, which has no catalytic activity. The interaction between the trace moisture contained in the acetylene gas and the mercuric chlor...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problem that the prior art cannot economically process and recycle the waste mercuric chloride catalyst, the invention provides a method for activating and reclaiming the waste mercuric chloride catalyst, comprising the following steps:

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