A multi-element homogeneous heteropoly acid catalyst, a preparation method and application thereof

By preparing a multi-component homogeneous heteropolyacid catalyst in an aqueous solution, and utilizing the synergistic effect of tungstate, phosphoric acid, and mixed quaternary ammonium salts, the safety, environmental pollution, and stability issues of existing heteropolyacid catalysts were resolved. This resulted in the efficient catalytic synthesis of diglycidyl 4,5-epoxycyclohexane-1,2-dicarboxylic acid, improving product yield and epoxy value.

CN117839732BActive Publication Date: 2026-07-03CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Application Number
CN202211213648.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-09-30
Publication Date
2026-07-03
Estimated Expiration
2042-09-30

AI Technical Summary

Technical Problem

Existing heteropolyacid catalysts suffer from problems such as poor safety, serious environmental pollution, severe equipment corrosion, high cost, and insufficient catalytic activity and stability. In particular, in the catalytic synthesis of 4,5-epoxycyclohexane-1,2-dicarboxylic acid diglycidyl ester, the epoxy groups are prone to hydrolysis and ring-opening to form byproducts.

Method used

A multi-component homogeneous heteropolyacid catalyst is prepared by reacting tungstate, phosphoric acid and mixed quaternary ammonium salt in an aqueous solution, avoiding the use of strong acids and strong oxides. Stirring ensures that the mixed quaternary ammonium salt reacts fully with tungstate and phosphoric acid to form a stable catalyst. Adjusting the pH of the reaction system improves the dispersibility and activity of the catalyst.

Benefits of technology

This approach achieves high catalyst yield and high activity, reduces environmental pollution, improves catalyst lifespan and stability, avoids hydrolysis and ring-opening side reactions, increases product yield and epoxy value, and enhances heat resistance.

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Abstract

This invention discloses a multi-component homogeneous heteropolyacid catalyst, its preparation method, and its applications. The catalyst is obtained from the reaction of raw materials including tungstate, phosphoric acid, and a mixed quaternary ammonium salt, wherein the mixed quaternary ammonium salt consists of two different single-chain or double-chain quaternary ammonium salts. Based on the synergistic effect of the components among the raw materials, this catalyst does not use strong acids or strong oxides, significantly improving its catalytic activity and lifetime. The catalyst is prepared using a stepwise method, carried out entirely in an aqueous solution environment. High-speed stirring ensures that the mixed quaternary ammonium salt reacts fully with the tungstate and phosphoric acid to form a stable multi-component catalyst. Using the catalyst provided by this invention to catalyze the reaction of 4,5-epoxycyclohexane-1,2-dicarboxylic acid diglycidyl ester, without the addition of basic dihydrogen phosphate to suppress hydrolysis and ring-opening side reactions, the yield, epoxy value, and heat resistance of the product are significantly improved.
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Citation Information

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