Reaction liquid, method and device for preparing m-toluic acid from m-xylene

By using a catalyst system composed of organic transition metal salts and organic bromide ligands and a micro/nano bubble reactor, the problems of low reaction efficiency and poor selectivity in the production of m-methylbenzoic acid have been solved, achieving the preparation of high-purity and high-selectivity m-methylbenzoic acid, thus meeting the needs of green and efficient modern chemical industry.

CN121949094APending Publication Date: 2026-05-01ZHEJIANG HUANHUA TECH CO LTD
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Patent Information

Application Number
CN202511600732.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-04
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

Existing technologies for the production of m-methylbenzoic acid suffer from problems such as low reaction efficiency, poor selectivity, significant safety hazards, high equipment costs, and heavy environmental pressure, making it difficult to meet the green and efficient requirements of modern chemical industry.

Method used

A homogeneous metal catalyst system composed of organic transition metal salts and organic bromide ligands was used in conjunction with a micro/nano bubble reactor to prepare m-methylbenzoic acid via catalytic oxidation. The micro/nano bubbles were used to increase mass transfer efficiency, control the resource utilization of by-products, and improve the selectivity and efficiency of the oxidation reaction.

Benefits of technology

It significantly improved the conversion rate of m-xylene and the selectivity of m-methylbenzoic acid, achieving a product purity of 99.2%. The reaction time was short and the energy consumption was low, realizing efficient and green production of m-methylbenzoic acid.

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Abstract

The invention provides a reaction liquid, a method and a device for preparing m-toluic acid from m-xylene, and belongs to the field of fine chemical engineering. The reaction liquid for preparing the m-toluic acid is prepared from the following components in parts by weight: 100 parts of mixture containing m-xylene, 0.015 to 0.08 part of organic transition metal salt, 0.03 to 0.1 part of organic bromide ligand and 50 to 70 parts of reaction solvent. According to the method, a mixture containing m-xylene is taken as a raw material, a homogeneous metal catalyst compounded by organic transition metal salt and organic bromide ligand is taken as a catalyst system, and liquid-phase oxygen selective oxidation is carried out to prepare m-toluic acid; a micro-nano bubble reactor is adopted. The method has the advantages of short reaction time, high selectivity of m-toluic acid, low energy consumption, high synthesis efficiency, environmental protection and the like.
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