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Ethyl gallate is a food additive with E number E313. It is the ethyl ester of gallic acid. Ethyl gallate is added to food as an antioxidant. Though found naturally in a variety of plant sources including walnuts Terminalia myriocarpa or chebulic myrobolan (Terminalia chebula), ethyl gallate is produced from gallic acid and ethanol. It can be found in wine.
A method for preparing alkyl gallate without using aqueous agent
This invention discloses a method for preparing alkyl gallate without a dehydrating agent, belonging to the field of chemical reaction auxiliary technology. By optimizing the raw material ratio of the reaction system, precisely controlling the reaction environment parameters and the condensate separation rate, this invention utilizes the azeotropic properties of alcohol and water to achieve efficient separation of the water generated in the reaction. It can promote the forward esterification reaction without adding any dehydrating agent, achieving the same or even better water separation and reaction promotion effects without the need for a dehydrating agent. This invention eliminates the need for a dehydrating agent, and the synthesized methyl gallate, ethyl gallate, propyl gallate, octyl gallate, and lauryl gallate can reach a maximum content of 99.2%, with a stable product yield of 50-57g. This effectively reduces production costs, avoids the pollution problems caused by dehydrating agents, simplifies the production process, and possesses both green environmental protection and promising prospects for industrial-scale application.
Owner:GALLOCHEM CO LTD