Patent ID: 7101996
Filing Date: 2006-09-05
Classification: C07H,C08B,D21C

Abstract:
1. A process for the separation of purified hemicellulose from insoluble cellulose and cellulose-hemicellulose complexes in caustic liquor from solubilizing fiber with alkali comprising the steps of adding alcohol to the caustic liquor to precipitate the hemicellulose so that the hemicellulose floats on top of the caustic liquor and alcohol and density separation of the floating hemicellulose precipitate from the insoluble cellulose and cellulose-hemicellulose complexes in caustic liquor simultaneously with the precipitation of the hemicellulose wherein the ratio of alcohol to water in the caustic liquor is about 3:1 to about 9:1.