Gas-liquid separation and recovery process in chlorinated paraffin chlorination process

By optimizing the production process of chlorinated paraffin, chlorine is recovered using a tandem reaction device and a polydimethylsiloxane separation membrane, a secondary tube cooler is equipped to improve solvent recovery, and the reaction heat is controlled through efficient stirring and precise temperature control technology, solving the problems of low chlorine utilization, large solvent loss, incomplete treatment of by-products and difficult control of strong exothermic reactions in traditional processes, achieving efficient, economical and environmentally friendly chlorinated paraffin production.

CN119752483AInactive Publication Date: 2025-04-04SHANDONG ZHANHUA YANG PHOTOCHEMISTRY CO LTD
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Patent Information

Application Number
CN202411904160.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-23
Publication Date
2025-04-04
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

In the traditional chlorinated paraffin production process, chlorine gas utilization rate is low, solvent loss is large, by-product treatment is incomplete, and strong exothermic reaction control is difficult, resulting in waste of resources, environmental pollution and high production costs.

Method used

By optimizing the production process of chlorinated paraffin, chlorine gas is recovered using a tandem reaction device and a polydimethylsiloxane separation membrane, a secondary tube cooler is equipped to improve solvent recovery, a pure water absorption tower is used to treat hydrochloric acid gas, and the reaction heat is controlled through efficient stirring and precise temperature control technology.

Benefits of technology

It has achieved efficient recycling of chlorine, maximum solvent utilization, thorough treatment of by-products and effective control of reaction heat, which has improved production efficiency, reduced operating costs, and reduced environmental pollution risks.

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Abstract

The invention relates to a gas-liquid separation and recovery process in a chlorinated paraffin chlorination process, and belongs to the technical field of gas-liquid separation and recovery. According to the process, the problems of low chlorine utilization rate, high solvent loss, difficulty in hydrochloric acid gas treatment and the like are solved by optimizing the production flow of chlorinated paraffin. Tail gas is released in the process of generating chlorinated paraffin-42 and chlorinated paraffin-70, the tail gas contains unreacted chlorine and byproduct hydrochloric acid gas, the tail gas is cooled and refluxed by using a tubular cooler, and the carbon tetrachloride solvent is recovered. Chlorine and hydrochloric acid gas in the tail gas are separated through a polydimethylsiloxane separation membrane, the recycled chlorine returns to continue to participate in the chlorination reaction, the hydrochloric acid gas is purified through a pure water absorption tower, and a 20%-30% hydrochloric acid solution is prepared. According to the process, the chlorine recycling rate and the solvent recycling rate are increased, the chlorine content of the product is accurately controlled through a series device, and chlorinated paraffin-42 and chlorinated paraffin-70 products are generated.
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