A process for the preparation of 1,3-propanedisulfonic acid

By optimizing the multi-step concentration and acidification reaction, the problems of low yield and purity in the preparation of 1,3-propanedisulfonic acid have been solved, realizing the efficient and environmentally friendly preparation of 1,3-propanedisulfonic acid, which is suitable for high-end fields such as pharmaceuticals and dyes.

CN122102962APending Publication Date: 2026-05-29HUBEI YUANHUAN IND INVESTMENT CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUBEI YUANHUAN IND INVESTMENT CO LTD
Filing Date
2026-02-10
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing methods for preparing 1,3-propanedisulfonic acid suffer from low yield and low purity, making it difficult to meet purity requirements, especially in high-end applications. Furthermore, traditional methods impose a significant environmental burden.

Method used

Sodium sulfite was reacted with 1,3-dichloropropane under normal pressure to produce a sodium propylene disulfonate synthesis solution. Sodium chloride was separated and purified by evaporation through a multi-step concentration and acidification reaction combined with vacuum and temperature control. The reaction conditions were optimized to improve the yield and purity.

Benefits of technology

The method achieves efficient preparation of 1,3-propanedisulfonic acid, with a yield of ≥60% and a purity of ≥95%, reducing environmental pollution and making it suitable for industrial production and meeting the needs of high-end fields.

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Abstract

The application discloses a preparation method of 1,3-propanedisulfonic acid, which uses sodium sulfite and 1,3-dichloropropane as starting materials, and synthesizes sodium propanedisulfonate through sulfonation, and then concentrates, acidifies, separates sodium chloride, secondarily concentrates, evaporates and dehydrates, so as to obtain 1,3-propanedisulfonic acid with a purity of greater than or equal to 95.0%. The method is stable in process, high in yield (greater than or equal to 60.0%), and suitable for industrial production, and the raw materials are easy to obtain, so that the problems of low yield and low purity in the prior art are solved.
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