METHOD OF COMPLEX PROCESSING OF BIRCH WOOD Russian patent published in 2017 - IPC A61K36/185 B01D11/02 

FIELD: wood industry.

SUBSTANCE: method includes the step of prehydrolysis sawdust at atmospheric pressure with an aqueous solution of 2-3 wt % sulfuric acid at a liquor ratio 8, a temperature of 100°C, duration of 3-5 hours, with vigorous stirring wood delignification stage residue at atmospheric pressure with an aqueous solution containing 30 wt % acetic acid and 4-5 wt % hydrogen peroxide and the catalyst was 2 wt % sulfuric acid at 100°C, liquor ratio of 10-15, the duration of 3.5 hours, with vigorous stirring, acetic acid was distilled off from the spent cooking liquor, dilution of the distillation residue and precipitation of the lignin extraction it with liquor ratio 2 distilled water heated to 90°C, for 10 minutes to obtain a lignin sorbent.

EFFECT: reduced costs.

1 dwg, 3 tbl, 5 ex