METHOD FOR LIGNIN PURIFICATION

Canada Patent

PATENT NO 3127737
APP PUB NO CA-3127737-A1
SERIAL NO

3127737

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The invention is directed to a method for producing a purified lignin salt from alkaline spent liquor from the chemical cooking of lignocellulosic raw materials. The method comprises the steps of decreasing the spent liquor pH to form a lignin precipitate suspension: filtering the lignin precipitate to form a lignin filter cake and a filtrate; mixing the lignin filter mice into a dilution liquid to form an alkalilignin agglomerate colloid; subjecting the alkalilignin agglomerate colloid to large-pore membrane filtration; and recovering a purified lignin salt concentrate.

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