Directional chlorination double-catalyst method of ultra pure p-dichlorobenzene for special engineering plastic chlorobenzene thioether and separation method

By using ultrapure p-dichlorobenzene directional chlorination double catalyst method and multiple decolorization treatments in the preparation process of dichlorobenzene, the problems of environmental pollution and low purity were solved, and the preparation of high-purity and low-pollution dichlorobenzene was achieved. Reduced production costs.

CN106316773AInactive Publication Date: 2017-01-11JIANGSU PENGYU CHEM
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Patent Information

Application Number
CN201510387870.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2015-07-06
Publication Date
2017-01-11
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The existing technology has problems of environmental pollution and low purity in the process of preparing dichlorobenzene. Especially when copper or copper salt catalysts are used under high temperature and high pressure, highly corrosive hydrogen chloride is easily produced, and it is difficult to effectively remove dichlorobenzene by existing methods. Impurities in chlorobenzene affect the purity of the product.

Method used

Ultrapure p-dichlorobenzene directional chlorination double catalyst method is used to generate chlorinated benzene through the reaction of phenol and mercaptoethylamine, and dichloronitromethylamine is used as a catalyst, combined with the decolorization treatment of activated carbon and clay, and finally crystallization in falling film Continuous crystallization is carried out in the device to improve the purity of dichlorobenzene.

Benefits of technology

It effectively reduces the pollution level of the preparation environment, improves the purity of dichlorobenzene to more than 99.8%, shortens the reaction time, saves production costs, and ensures the cleanliness of the product through multiple decolorization treatments.

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Abstract

The invention provides a directional chlorination double-catalyst method of ultra pure p-dichlorobenzene for special engineering plastic chlorobenzene thioether and a separation method. The method is characterized in that phenol is used as a raw material; 2-aminoethanethiol is used as a catalyst for generating chlorobenzene, 2-aminoethanethiol and phenol are mixed, mixed 2-aminoethanethiol and phenol are poured into a reaction vessel, and the temperature of the reaction vessel is controlled at 50-80 DEG C; 2-aminoethanethiol and phenol are stirred fully, chlorine is poured into the reaction vessel, wherein conveying speed of chlorine is 15 cubic meter / hour, so that a reaction is carried out between chlorine and the mixture of 2-aminoethanethiol and phenol, and chlorobenzene is obtained; phenol and 2-aminoethanethiol are used for preparing chlorobenzene, preparation environment is protected, concentration level of pollutants in the preparation environment is reduced, a mutual combination method of active carbon and pottery clay is used, decolorization of dichlorobenzene is carried out further, filter membranes are arranged at double sides of active carbon, and filtering effects of dichlorobenzene are better.
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