Whole-flow process for synthesizing nitrobenzene by using micro-channel reactor

By using a microchannel reactor and a multi-stage wastewater treatment system, the safety hazards and high acid consumption in nitrobenzene synthesis have been solved, achieving efficient and safe nitrobenzene production and wastewater treatment.

CN122301683APending Publication Date: 2026-06-30CHINA PETROLEUM & CHEMICAL CORP +2
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Patent Information

Application Number
CN202411952215.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-27
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing methods for synthesizing nitrobenzene have safety risks and high acid consumption. Batch reactors are difficult to control heat removal effectively, leading to safety risks and difficulties in waste acid treatment.

Method used

The entire process of nitrobenzene synthesis is carried out using a microchannel reactor, including mixed acid preparation, microchannel reaction, sedimentation and stratification, water washing and alkali washing, waste acid recovery and wastewater treatment. Acid consumption is reduced by using a multi-stage distillation and wastewater treatment system, and wastewater is treated by medium-temperature catalytic wet oxidation and microbial anaerobic denitrification.

Benefits of technology

This significantly improves the safety and production efficiency of nitrobenzene synthesis, reduces acid consumption, and achieves environmentally friendly production processes by treating wastewater through multi-stage treatment to meet discharge standards.

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Abstract

The invention discloses a whole-flow process for preparing nitrobenzene by using a micro-channel reactor, belonging to the field of nitrobenzene synthesis, and the whole-flow process comprises acid mixing, micro-channel nitration reaction, intermediate product cooling layering, water washing and alkali washing, crude product distillation, waste acid recovery and wastewater treatment. Compared with an existing nitrobenzene synthesis technology, the mass transfer efficiency is high, the nitration reaction time can be remarkably shortened, the production efficiency is greatly improved, the reaction safety is improved, meanwhile, waste acid recovery and wastewater treatment are achieved, and safe, environment-friendly and stable production is guaranteed.
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