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Method for improving separation of carbohydrates from wood pulping and wood or biomass hydrolysis liquors

United States Patent

April 20, 2010
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A method for separating carbohydrates from pulping liquors includes the steps of providing a wood pulping or wood or biomass hydrolysis pulping liquor having lignin therein, and mixing the liquor with an acid or a gas which forms an acid upon contact with water to initiate precipitation of carbohydrate to begin formation of a precipitate. During precipitation, at least one long chain carboxylated carbohydrate and at least one cationic polymer, such as a polyamine or polyimine are added, wherein the precipitate aggregates into larger precipitate structures. Carbohydrate gel precipitates are then selectively removed from the larger precipitate structures. The method process yields both a carbohydrate precipitate and a high purity lignin.
Griffith; William Louis (Oak Ridge, TN), Compere; Alicia Lucille (Knoxville, TN), Leitten, Jr.; Carl Frederick (Lenoir City, TN)
UT-Battelle, LLC (Oak Ridge, TN)
11/ 563,286
November 27, 2006
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT The United States Government has rights in this invention pursuant to contract no. DEAC05-00OR22725 between the United States Department of Energy and UT-Battelle, LLC.