Patent ID: 6846916
Filing Date: 2005-01-25
Classification: C07H,Y02P

Abstract:
1. A process for preparing carbohydrate fatty-acid esters comprising the steps of: (a) reacting, by solvent free trans-acidolysis, acylated carbohydrate with free fatty acid in the presence of an acid catalyst, under reduced pressure in the range of about 4-20 Torr; (b) decolorizing and separating out the unreacted fatty acid, from the reaction mixture obtained in step (a); (c) precipitating out the unreacted acylated carbohydrate from the reaction mixture obtained in step (b); (d) recovering carbohydrate fatty ester from the reaction mixture obtained in step (C); and (e) librating free hydroxyl groups by partial hydrolysis of the C2- or C3-acylated carbohydrate fatty acid ester in the presence of an acid catalyst to obtain carbohydrate fatty acid ester having free hydroxyl groups with Hydrophile-Lipophile-Balance (HLB) values of 1 to 16.