Comprehensive utilization method of hydrogen-peroxide-process epichlorohydrin by-product

Abstract

The invention provides a comprehensive utilization method of a hydrogen-peroxide-process epichlorohydrin byproduct. The comprehensive utilization method comprises the following steps: subjecting hydriodic acid to reacting with 1-CMP and 2-CMP to convert 1-CMP and 2-CMP into 3-chloro-1,2-propanediol, recovering the byproduct iodomethane generated by the reaction through a desolventizing device, and carrying out negative-pressure dehydration to obtain a material with high content of 3-chloro-1,2-propanediol; and dehydrating 3-chloro-1,2-propanediol by using an oxide super solid acid in a fixed bed as a catalyst, converting 3-chloro-1,2-propanediol into epichlorohydrin, and carrying out negative-pressure rectification to obtain an epichlorohydrin product. According to the invention, 1-CMP and 2-CMP in by-products and the hydrolysis by-product 3-chloro-1,2-propanediol in the production process of epichlorohydrin are fully utilized in the whole reaction process; on one hand, the yield of the hydrogen-peroxide-process epichlorohydrin is improved and value is created; and on the other hand, the treatment amount of hazardous wastes is greatly reduced, cost is reduced, and the popularization of a hydrogen peroxide process for epichlorohydrin is facilitated.

Description

technical field [0001] The invention relates to a comprehensive utilization method of by-products of chemical products, in particular to the comprehensive utilization of epichlorohydrin by-products of the hydrogen peroxide method. Background technique [0002] Epichlorohydrin is a volatile and unstable colorless oily liquid, slightly soluble in water, mainly used in the manufacture of epoxy resins, and is also the main raw material for epoxy and phenoxy resins. At present, the production methods of epichlorohydrin include chlorohydrin method, glycerin method, and hydrogen peroxide method. The hydrogen peroxide method epichlorohydrin process uses hydrogen peroxide as the oxygen source, methanol as the solvent, and titanium silicon molecular sieve as the catalyst. Oxychloropropane, this process has high atomic utilization rate and less waste, and is a clean process encouraged by the state. [0003] Since the hydrogen peroxide method generally uses methanol as a solvent, epich...

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Problems solved by technology

[0003] Since the hydrogen peroxide method generally uses methanol as a solvent, epichlorohydrin and methanol will react to generate 1-chloro-3-methoxy-2-propanol (2-CMP) and 3-chloro-2-methoxy in the production process. Base-1-propanol (1-CMP) two impurities, these two impurities are usually collectively referred to as by-products together with epichlorohydrin hydrolysis product 3-chloro-1,2-propanediol, and its main composition is 1-chloro- 3-methoxy-2-propanol 60~70%, 3-chloro-2-methoxy-1-propanol 10~20%, 3-chloro-1,2-propanediol 5~10%, the rest is Low polymer; often these by-products are disposed of as hazardous waste, which is difficult and costly due to the chlorine content of the components

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