Preparation method of alkyl gallate without water-carrying agent

By optimizing reaction parameters and utilizing the binary azeotropic properties of alkyl alcohols and water, the efficient synthesis of alkyl gallic acid esters was achieved, solving the problems of high cost, low purity, and complex process caused by the use of water-carrying agents, and realizing green and efficient production of alkyl gallic acid esters.

CN122325322APending Publication Date: 2026-07-03GALLOCHEM CO LTD
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Patent Information

Application Number
CN202610437976.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-03
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

In the existing synthesis process of alkyl gallic acid esters, the use of dehydrating agents increases production costs, leads to decreased product purity, complicated process flow, environmental pollution and safety hazards, and makes it difficult to achieve standardized and large-scale production.

Method used

A dehydrating agent-free preparation method is adopted. By optimizing the reaction system parameters and utilizing the binary azeotropic properties of alkyl alcohol and water, water is efficiently separated, and alkyl gallic acid esters are directly synthesized. This method avoids the use of dehydrating agents, simplifies the process, and improves production efficiency.

Benefits of technology

It significantly reduces total production costs, simplifies the process, increases production efficiency by more than 40%, and achieves a product purity of up to 99.2%. It is highly adaptable and suitable for the efficient synthesis of various gallic acid alkyl esters, meeting the requirements of green chemical production.

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Abstract

The invention discloses a preparation method of alkyl gallate without a water-carrying agent, and belongs to the technical field of chemical reaction assistance. According to the method, the raw material ratio of a reaction system is optimized, the reaction environment parameters and the condensate separation rate are accurately regulated and controlled, efficient separation of water generated by reaction is realized by utilizing the alcohol-water binary azeotropic characteristic, and the esterification reaction can be promoted to be carried out in the forward direction without adding any water-carrying agent; the same and even better water separation and reaction promotion effects can be achieved without using a water-carrying agent. According to the method, a water-carrying agent can be directly abandoned, the content of the synthesized methyl gallate, ethyl gallate, propyl gallate, octyl gallate and lauryl gallate can reach 99.2% at most, the product yield is stabilized to be 50-57 g, the production cost is effectively reduced, the pollution problem caused by the water-carrying agent is avoided, the production process is simplified, and the method has green environmental protection property and industrial large-scale application prospects.
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