METHOD FOR PREPARING HIGH-PURITY ANHYDROSUGAR ALCOHOL USING SEQUENTIAL COMBINATION OF THIN FILM DISTILLATION AND SHORT PATH DISTILLATION

摘要

The present invention relates to a technique for preparing an anhydrosugar alcohol using hydrogenated sugar as a raw material and, more specifically, to a technique for preparing a high-purity anhydrosugar alcohol (in particular, isosorbide, isomannide, isoidide, and the like) having a purity of 98% or higher and containing less than 0.1% of sorbitol and a sorbitan isomer, which are impurities, in a high total distillation yield of 94% or higher (more preferably, 95% or higher) by adding an acid to hydrogenated sugar (for example, hexitol) to convert same to an anhydrosugar alcohol, and then distilling the converted liquid over two or more stages by sequentially using a combination of an external condenser type wiped film evaporator and an internal condenser type short path evaporator.

主权项

1. A method for producing anhydrosugar alcohol comprising the steps of:
converting hydrogenated sugar to anhydrosugar alcohol by dehydration reaction, and distilling the resulting liquid of the converting step in two or more stages by sequential use of a combination of an external condenser type, wiped-film evaporator and an internal condenser type, short-path evaporator.