A method for purifying sucrose fatty acid ester

The present invention relates to a process for purifying sucrose fatty acid ester. This method is crude product was dissolved in a sucrose ester can be separated from the aqueous organic solvent to give a crude sucrose ester solution was added dropwise with stirring a solution of alkaline earth metal and / or alkaline earth metal oxide salt solution, crude sucrose ester solution generating fatty acid soaps insoluble fatty acid alkaline earth metal salts of an organic solvent and then removing the solid alkaline earth metal salt of fatty acid generation, and then brine was added and extracted with stirring, separating the lower aqueous layer was allowed to stand, the supernatant with stirring under cooling to 0 ℃ -40 ℃, sucrose esters precipitation of crystals as a precipitate, removing the liquid and the solid material dried to give the product sucrose ester. The present invention introduces a cooling crystallization process, in addition to the problem of residual starting material such as fatty acid methyl esters and the like in the product unreacted further improve the level of content of the product, the product of the total ester content of 98%.