Method for producing methylsulfonic acid with low sulfate residue

JP2026520196APending Publication Date: 2026-06-22WANHUA CHEM GRP CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
WANHUA CHEM GRP CO LTD
Filing Date
2023-12-12
Publication Date
2026-06-22

AI Technical Summary

Technical Problem

The existing production methods for methylsulfonic acid result in high sulfate and heavy impurity contents, exceeding 50 ppm, which negatively impact product quality and require extensive purification, particularly in the electronics and electrical industries, leading to issues like plating slag formation during electroplating.

Method used

A method involving controlled dimethyl polysulfide content in raw materials, using a catalyst and oxidizing agent in a kettle-type reactor, followed by post-treatment to produce methylsulfonic acid with reduced sulfate and heavy impurities, achieving a content of less than 1 ppm.

Benefits of technology

The method produces high-quality methylsulfonic acid suitable for high-precision industries, simplifies purification processes, reduces energy consumption, and improves product stability, with minimal color change over time.

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Abstract

A method for producing methylsulfonic acid with a low sulfate residue, comprising the steps of: reacting dimethyl disulfide, which has a dimethyl polysulfide content of less than 350 ppm, preferably less than 220 ppm, as a raw material in a kettle reactor in the presence of a catalyst and an oxidizing agent; and, after the reaction is complete, post-treating the reaction solution to obtain methylsulfonic acid. By controlling the dimethyl polysulfide content in the raw material, the problem of high sulfate content in the methylsulfonic acid product can be solved, resulting in a high-quality product with a significantly reduced heavy impurity content. This not only improves the product yield but also contributes to simplifying the heavy impurity removal process and reducing energy consumption.
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