Patent ID: 9505777
Filing Date: 2016-11-29
CPC Classification: B01J,C07B,C07D

Claim Text:
1. A method for preparation of anhydrosugar alcohol comprising the steps of: (1) converting hydrogenated sugar to anhydrosugar alcohol by dehydration reaction; (2) distilling the resulting liquid of the reaction of said step (1) by using a thin-film evaporator; (3) crystallizing the resulting distillate of said step (2); (4) decolorizing the resulting crystallite of said step (3); (5) treating the resulting product of said step (4) with cationic ion exchange resin; and (6) treating the resulting product of said step (5) with anionic ion exchange resin, wherein the prepared anhydrosugar alcohol has as purity of 99% or higher, an on content of 10 ppm or less, a pH of 6 to 8, a conductivity of 10 pS/cm or less, and a YI value of 0.1 or less.