Green preparation method of poly (2, 3-dimethylaniline)

By using an oxidation system of Fe3+ catalyst and hydrogen peroxide, combined with recycling and appropriate adjustment of the molar ratio, the problem of low recycling rate of mother liquor in the poly(2,3-dimethylaniline) reaction was solved, achieving high yield and green and environmentally friendly production, and reducing the difficulty and cost of wastewater treatment.

CN122356473APending Publication Date: 2026-07-10BSM CHEM CO LTD
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Patent Information

Application Number
CN202610724565.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-25
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

In existing technologies, the reaction mother liquor of poly(2,3-dimethylaniline) is directly treated as waste or has a low reuse rate, which makes it difficult to effectively improve the yield. In addition, traditional methods generate a large amount of waste salt and wastewater, making it difficult to achieve green and environmentally friendly production.

Method used

An oxidation system using Fe3+ catalyst and hydrogen peroxide was developed. By circulating the reaction mother liquor and adjusting the molar ratio of hydrogen peroxide to 2,3-dimethylaniline during the circulation process, combined with alkali washing, water washing and vacuum drying steps, a high-yield green preparation of poly-2,3-dimethylaniline was achieved.

Benefits of technology

This method improves the yield of poly(2,3-dimethylaniline), reduces waste acid emissions, lowers wastewater treatment costs, enables the sustainable reuse and economic value of the reaction mother liquor, and avoids the generation of waste salts in traditional methods.

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Abstract

The invention relates to the technical field of preparation of polyaniline derivatives, in particular to a green preparation method of poly (2, 3-dimethylaniline). The green preparation method provided by the invention comprises the following steps: mixing a reaction mother solution for preparing poly (2, 3-dimethylaniline), a nitric acid solution and 2, 3-dimethylaniline, adding a Fe < 3 + > catalyst, carrying out first heat preservation, adding hydrogen peroxide, and carrying out second heat preservation to obtain a first applied reaction mother solution and a filter cake; and carrying out post-treatment on the filter cake to obtain the poly (2, 3-dimethylaniline), recycling the first recycling reaction mother liquor according to the process; in the cyclic application process, when the COD content in the reaction mother liquor obtained after application is greater than 29000 mg / L, the molar ratio of H2O2 to 2, 3-dimethylaniline in the hydrogen peroxide is increased on the basis of the molar ratio of H2O2 to 2, 3-dimethylaniline in the hydrogen peroxide in the first application process. The preparation method is high in yield and environmentally friendly.
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