Biomass fractionation process

Details Biomass fractionation process Biomass fractionation process

C - Chemistry, Metallurgy

07

G

260/133, 9/28

C07G 1/00 (2006.01) D21C 3/20 (2006.01)

Patent

CA 1284637

BIOMASS FRACTIONATION PROCESS ABSTRACT Disclosed is a process for extracting lignin from lignocellulosic material to recover reactive lignin and to yield high quality cellulosic pulp, which comprises the steps of: (a) impregnating lignocellulosic material with a liquor which comprises an aqueous organic solvent and an acid neutralizing agent; (b) heating the liquor with the impregnated ligno- cellulosic material submerged therein from a temperature of about 150°C to a maximum temperature in the maximum tempera- ture range of 200°C to 280°C and then cooling the liquor with material submerged therein to a temperature of less than about 150°C; (c) maximizing reactive lignin solvation while suppressing cellulose degradation during step (b) by: i. controlling the amount of neutralizing agent in step (a) to achieve a final pH for step (b) of from 6.0 to 8.0 in the liquor during heating in step (b) from about 150°C to about 175°C, and ii. maximizing the time at which the liquor is within the maximum temperature range during step (b) by rapidly cooling the liquor to terminate step (b); and (d) recovering reactive lignin and high quality cellulose pulp from the cooled liquor.

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