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US 9,963,414 B2Granted
Process for the preparation and isolation of carboxylic esters
AssigneesThyssenkrupp Industrial Solutions AG, thyssenkrupp AG
InventorsMarkus Fritsch, Armin Börner, Ivan Shuklov, Zeljko Knez
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Abstract
The disclosed methods for preparing and isolating carboxylic esters ensure a high product purity and minimize technical complexity. These methods are based on the reaction of a carboxylic acid with an alcohol in an aqueous medium. In some examples, the alcohol is used both for the esterification and for the precipitation of the salts, preferably ammonium salts, formed in the synthesis.
Claims22
A method for preparing and isolating carboxylic esters of mono- and dicarboxylic acids, hydroxycarboxylic acids, and fatty acids, the method comprising:
- providing an aqueous solution of at least one salt of at least one carboxylic acid;
- acidifying the aqueous solution with at least one acid to form a free carboxylic acid and a salt of said at least one acid;
- precipitating the salt of said at least one acid, formed in said acidifying step, by adding at least one alcohol to the aqueous solution;
- removing the precipitated salt from the aqueous solution;
- esterifying the at least one free carboxylic acid by adding at least one alcohol;
- and
- separating at least one carboxylic ester from the aqueous solution.
4 more elements
Dependencies are inferred from the claim text.