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Two-stage dehydration of sugars

United States Patent

November 10, 2009
View the Complete Patent at the US Patent & Trademark Office
Pacific Northwest National Laboratory - Visit the Technology Commercialization Program Website
The invention includes methods for producing dianhydrosugar alcohol by providing an acid catalyst within a reactor and passing a starting material through the reactor at a first temperature. At least a portion of the staring material is converted to a monoanhydrosugar isomer during the passing through the column. The monoanhydrosugar is subjected to a second temperature which is greater than the first to produce a dianhydrosugar. The invention includes a method of producing isosorbide. An initial feed stream containing sorbitol is fed into a continuous reactor containing an acid catalyst at a temperature of less than C. The residence time for the reactor is less than or equal to about 30 minutes. Sorbitol converted to 1,4-sorbitan in the continuous reactor is subsequently provided to a second reactor and is dehydrated at a temperature of at least C. to produce isosorbide.
Holladay; Johnathan E. (Kennewick, WA), Hu; Jianli (Kennewick, WA), Wang; Yong (Richland, WA), Werpy; Todd A. (West Richland, WA)
Battelle Memorial Institute (Richland, WA)
11/ 341,930
January 26, 2006
CONTRACTUAL ORIGIN OF THE INVENTION This invention was made with Government support under contract DE-AC0676RLO-1830, awarded by the U.S. Department of Energy. The Government has certain rights in this invention.