| abstract |
Process for the preparation and isolation of carboxylic acid esters of mono- and dicarboxylic acids, hydroxycarboxylic acids and fatty acids with the following steps: a) provision of an aqueous solution of at least one salt of at least one carboxylic acid, b) acidification of the aqueous solution with at least one acid with the formation of the free carboxylic acid and an acid salt, c) precipitation of the salt by adding at least one alcohol to the solution, d) separation of the precipitated salt from the solution, e) esterification of the at least one free carboxylic acid by adding at least one alcohol and f) separation of the at least one carboxylic acid ester from the solution, adding in the esterification of step e) a catalyst, which is selected from - the group of water-insoluble acids, in particular dodecylbenzenesulfonic acid, - the group of lipases, - the group of solid acids or - mixtures ace of them. |