Method for coproducing acid-phase-process synthesized chlorinated polyethylene and glycerol-process synthesized epoxy chloropropane

Abstract

The invention belongs to the technical field of chemical engineering, and particularly relates to a method for coproducing acid-phase-process synthesized chlorinated polyethylene and glycerol-process synthesized epoxy chloropropane. The method comprises an acid-phase-process chlorinated polyethylene synthesis technique and a glycerol-process epoxy chloropropane synthesis technique, and is characterized in that acid mother liquor generated in the centrifugal dewatering step in the acid-phase-process chlorinated polyethylene synthesis technique is resolved under normal pressure to extract hydrogen chloride gas, the extracted hydrogen chloride gas enters the chlorination reaction step in the glycerol-process epoxy chloropropane synthesis technique, and the residual azeotropic mixture containing hydrochloric acid after extracting hydrogen chloride gas from the acid mother liquor returns to the chlorination reaction step in the acid-phase-process chlorinated polyethylene synthesis technique as an acid phase. The invention recycles the byproduct hydrochloric acid in the acid-phase-process chlorinated polyethylene synthesis technique, can effectively lower the production cost, and enhances the economic benefit.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for synthesizing epichlorohydrin by an acid phase method for synthesizing chlorinated polyethylene and co-producing glycerin. Background technique [0002] Chlorinated polyethylene (CPE for short) is a polymer synthetic material obtained by chlorination modification of polyethylene (generally high-density polyethylene, low-density polyethylene, and linear low-density polyethylene). Different, can be divided into plastic CPE (chlorine content 15%), elastic CPE (16%-20%), elastomeric CPE (25%-50%), hard CPE (51%-60%) and high elastic CPE . The chlorine content of commercial CPE is generally 30%-40%, and its performance is similar to rubber; if the chlorine content is less than 30%, its performance is close to polyethylene; if the chlorine content is higher than 40%, its performance is close to polyvinyl chloride . At present, the main producers are...

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Problems solved by technology

[0004] However, in the existing acid-phase production process, the acidic wastewater containing a large amount of high-concentration hydrochloric acid produced in the acid-phase synthesis of chlorinated polyethylene is generally discharged after neutralization, which not only wastes resources, but also produces a large amount of sodium. , calcium salt, soil salinization is serious

At the same time, the main raw material of the synthesis of epichlorohydrin by the glycerin method is hydrogen chloride gas with a concentration of more than 99wt.%, which needs to be purchased or self-made, which undoubtedly increases the production cost and the harm caused by long-distance transportation.

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