PRODUCING LIGNIN FROM LIGNOCELLULOSE BIOMASS Russian patent published in 2014 - IPC C08H7/00 C08H8/00 C07G1/00 C08L97/00 

FIELD: chemistry.

SUBSTANCE: lignocellulose biomass is fed at first pressure and first temperature. The biomass includes a first solid fraction which contains insoluble lignin and a first liquid fraction which contains soluble C₆ saccharides, and soluble lignin. Before said phased feeding, at least part of the C₆ saccharides is removed from the biomass by fractionation. The first biomass pressure is lowered to a second pressure while virtually simultaneously lowering the first biomass temperature to a second temperature. Virtually simultaneous reduction of second pressure and second temperature to third pressure and third temperature is carried out to deposit soluble lignin into the first liquid fraction. A mixture is formed, which contains a second solid fraction which contains insoluble lignin, and deposited lignin, as well as a second liquid fraction which contains soluble C₆ saccharides. The invention enables to obtain a lignin product with small particles for improving combustion efficiency and preventing typical problems of equipment clogging and high degree of energy recovery.

EFFECT: reduced clogging of equipment with lignin when processing lignocellulose biomass.

29 cl, 1 dwg, 1 tbl, 1 ex