Patent ID: 7402224
Filing Date: 2008-07-22
Classification: D21C

Abstract:
1. Process for producing paper pulp, lignins, sugars and acetic acid, from a lignocellulosic plant material, which comprises the following successive steps: (i) impregnating the lignocellulosic plant material at atmospheric pressure and at a first temperature, higher than 50° C., by immersion with a mixture of formic acid containing at least 5% of acetic acid by weight, so as to obtain a suspension; (ii) subjecting the suspension to a fractionation reaction at a reaction temperature of between 50° C. and 115° C.; and (iii) separating at atmospheric pressure and at said reaction temperature a solid fraction constituting paper pulp from an organic phase containing in solution the starting formic acid and acetic acid, solubilized monomeric and polymeric sugars, lignins and acetic acid derived from the plant material.