Patent ID: 8956502
Filing Date: 2015-02-17
Classification: C08H,D21B,D21C

Abstract:
1. A method of fractionating a non-wood lignocellulosic material, said method comprising the steps of: (a) heating the material, without chemical pretreatment, in an alkaline solution of a pH above 9.0 at a temperature of at least 90° C. but below the glass transition temperature of the hemicellulose-lignin complex, (b) continuing heating in accordance with step (a) up to at least initial disintegration of cellular structures adhering to cellulosic fibres, (c) draining the heat-treated material from step (b) to obtain a liquid phase comprising a dissolved fraction and a drained wet material, and (d) subjecting the drained wet material from step (c), having a pH above 9.0, to grinding to obtain a fibrous fraction with a content of at least 80% of cellulose, the main part of cellulosic fibers in said fraction not being broken.