Patent ID: 8475627
Filing Date: 2013-07-02
Classification: D21C,Y02E

Abstract:
1. A process of treating a lignocellulosic material comprising: in a pre-extraction step, extracting hemicellulose from the lignocellulosic material, by contacting the lignocellulosic material with a solution of a basic material in water; then in a pulping step, separating the lignocellulosic material into pulp; then in an adsorption step, adsorbing the hemicellulose on the pulp; then recovering a sugar rich extract following the adsorption step; and then subjecting the pulp to a delignification process to remove lignin from the pulp wherein the adsorbed hemicellulose increases the selectivity of the delignification process at least about 10% compared to the same process without the hemicellulose pre-extraction and adsorption steps.