Continuous preparation method of 6-chloro-2, 4-dinitroaniline and diazonium salt thereof and equipment for implementing continuous preparation method

Through the continuous preparation method of nitration reaction in the microchannel reactor, the problems of wastewater, dust and environmental protection risks in the production process of 6-chloro-2,4-dinitroaniline are solved, and safe, environmentally friendly and low-cost production results are achieved.

CN119684132APending Publication Date: 2025-03-25ZHEJIANG RUNTU INST +1
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Patent Information

Application Number
CN202411854460.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-16
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

The existing 6-chloro-2,4-dinitroaniline production process produces a large amount of salt-containing wastewater, explosive dust and dry exhaust gas, which poses environmental protection and safety risks, and the solid-liquid-gas three-phase reaction in the chlorination process is difficult to carry out in the microchannel reactor.

Method used

By using a continuous preparation method, o-chloro-p-nitroaniline is dissolved in a sulfuric acid solution and undergoes nitration reaction with nitric acid or mixed acid solution in a microchannel reactor to obtain 6-chloro-2,4-dinitroaniline. This method does not produce waste salt and/or waste water, avoids the introduction of chlorinating agents, and improves safety and environmental protection.

Benefits of technology

The safe and environmentally friendly continuous preparation of 6-chloro-2,4-dinitroaniline is achieved, which avoids dust pollution and explosion risks, reduces production costs, and meets the environmental protection indicators of high-end dyes.

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Abstract

The invention provides a continuous preparation method of 6-chloro-2, 4-dinitroaniline and diazonium salt of 6-chloro-2, 4-dinitroaniline and equipment for implementing the continuous preparation method. The preparation method of the 6-chloro-2, 4-dinitroaniline comprises the following steps: dissolving o-chloro-p-nitroaniline in a sulfuric acid solution to obtain a sulfuric acid solution of the o-chloro-p-nitroaniline; the method comprises the following steps: conveying a sulfuric acid solution of o-chloro-p-nitroaniline and a nitric acid solution or a mixed acid solution into a first micro-channel reactor for nitration reaction to obtain a nitro compound; wherein the mixed acid solution comprises nitric acid and sulfuric acid. According to the preparation method of the 6-chloro-2, 4-dinitroaniline, waste salt and / or waste water are / is not generated, and a chlorinating agent is not introduced in the nitration process, so that the preparation method is more environment-friendly; a large amount of explosive dust and dry tail gas cannot be generated, and safety risks such as dust pollution and dust explosion do not exist. The preparation method of the 6-chloro-2, 4-dinitroaniline can be carried out in a micro-channel reactor, and the intrinsic safety degree is high.
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