METHOD OF PROCESSING LIGNOCELLULOSIC MATERIAL USING AN ALKALINE DELIGNIFICATION AGENT

摘要

The present invention relates to a method for obtaining sugar and lignin fractions from lignocellulosic materials and to a method for producing fermentation products using the sugars obtained from the lignocellulose. In particular, the present invention relates to a method for improving the sugar yield in the enzymatic hydrolysate by introducing a pre-treatment step of hydrothermal hydrolysis and an alkaline delignification step.

主权项

1. Method for fractionation of a lignocellulosic material, the method comprising:
a) Subjecting the lignocellulosic material to a treatment wherein hemicellulose is at least partially removed from the lignocellulosic material to produce a mixture containing a first liquid phase and a first solid phase, b) Separating the first solid phase from the first liquid phase, c) Subjecting the first solid phase to a delignification treatment in a presence of alkaline delignification agent to produce a mixture containing a second solid phase and a second liquid phase containing solubilized lignin, d) Separating the second solid phase from the second liquid phase, and e) Subjecting the second solid phase to an enzymatic hydrolysis treatment in a presence of enzymes capable of hydrolysing hemicellulose and cellulose fractions of the second solid phase to produce a mixture containing a third liquid phase and a third solid phase.