Patent ID: 7649099
Filing Date: 2010-01-19
Classification: C07D,Y02P

Abstract:
1. A method of producing a dianhydrosugar alcohol comprising: in a first reactor, reacting a polyol in the presence of a first catalyst to form a monocyclic sugar, the first catalyst being a solid acid catalyst selected from the group consisting of a heteropoly acid, an anion exchange resin, an acidic clay, a molecular sieve material and a sulfated zirconia; transferring the monocyclic sugar to a second reactor; and in a second reactor, converting the monocyclic sugar to a dianhydrosugar alcohol in the presence of a second catalyst selected from the group consisting of sulfuric acid, phosphoric acid, hydrochloric acid and p-toluenesulfonic acid; the reacting a polyol being conducted at a first temperature and the converting being conducted at a second temperature that is higher than the first temperature.