MULTISTAGE CELLULOSE HYDROLYSIS AND QUENCH WITH OR WITHOUT ACID Russian patent published in 2017 - IPC C07H3/02 C07H3/06 C07H1/08 C12P19/02 C12P19/04 B01J3/00 

FIELD: pulp and paper industry.

SUBSTANCE: present invention relates to methods of processing lignocellulose biomass. Proposed method comprises feeding lignocellulose biomass, including a first solid fraction of cellulose and lignin and a first liquid fraction; optionally separating said solid and liquid fractions; mixing said solid fraction with water to form pulp with preliminary heating of pulp to 210 °C–240 °C at 225–250 bar; contacting said pulp with a second reaction liquid to form a second reaction mixture, including a second solid fraction of lignin and a second liquid fraction of soluble C₆ saccharide, selected from C₆ monosaccharides, C₆ oligosaccharides and mixtures thereof; wherein said second reaction liquid includes supercritical water and optionally carbon dioxide and is located at a temperature of at least 374.2 °C and pressure sufficient to maintain said second reaction liquid in supercritical state; lowering temperature of said pulp below 140 °C; optionally acid hydrolysis of said second liquid fraction with formation of a composition containing C₆ saccharide, selected from C₆ oligosaccharide, having fewer elementary links, glucose, galactose, mannose, fructose and mixtures thereof.

EFFECT: novel method makes it possible to control rate of hydrolysis of cellulose, reduce rate of decomposition of glucose, increase content of C₆ monosaccharides and C₆ oligosaccharides.

46 cl, 2 ex, 1 tbl, 2 dwg