Preparation method of 2, 4-dinitroaniline

By using benzene as a starting material and employing concentrated sulfuric acid nitration, catalytic hydrogenation, and stepwise nitration, the problems of high cost and equipment corrosion in the existing synthesis of 2,4-dinitroaniline have been solved, achieving efficient, safe, and green production of 2,4-dinitroaniline.

CN122355838APending Publication Date: 2026-07-10TAYHO ADVANCED MATERIALS GRP CO LTD +2
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Patent Information

Application Number
CN202610838669.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-11
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing methods for synthesizing 2,4-dinitroaniline involve high raw material costs, harsh reaction conditions, severe equipment corrosion, and significant pressure to treat waste, making it difficult to achieve green and environmentally friendly industrial production.

Method used

Using benzene as the starting material, the synthesis of 2,4-dinitroaniline is achieved through nitration, catalytic hydrogenation, and stepwise nitration reactions in a concentrated sulfuric acid system, avoiding high temperature and high pressure. The process employs atmospheric pressure operation and an aqueous phase system, combined with the recovery and reuse of catalysts and acids.

Benefits of technology

It reduces production costs, increases product yield and purity, reduces equipment corrosion and wastewater discharge, meets green chemistry requirements, and is easy to apply industrially.

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Abstract

The invention relates to the technical field of organic chemical synthesis, in particular to a preparation method of 2, 4-dinitroaniline, which comprises the following steps: S1, carrying out nitration reaction on benzene in a concentrated sulfuric acid system to obtain a system containing nitrobenzene; s2, diluting the nitrobenzene-containing system with water, performing catalytic hydrogenation reaction to enable nitrobenzene to react into aniline, and filtering out the catalyst after the reaction is finished to obtain an aniline-containing system; s3, concentrated nitric acid is added into the aniline-containing system for a para-position nitration reaction, after the reaction is finished, the system is subjected to dehydration treatment, concentrated nitric acid is added again for an ortho-position nitration reaction, and after the reaction is finished, 2, 4-dinitroaniline is obtained through aftertreatment. The preparation method is green, safe, efficient, simple to operate, low in cost, low in raw material price and high in target product yield and purity, and is more suitable for industrial application.
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