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Method for lignin purification
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Title:
Method for lignin purification
Author:
Enqvist, Eric
;
Tarvo, Ville
;
Tikka, Panu
Subjects:
APPARATUS THEREFOR
;
CHEMISTRY
;
COMPOUNDS OF UNKNOWN CONSTITUTION
;
METALLURGY
;
ORGANIC CHEMISTRY
;
PAPER-MAKING
;
PRODUCTION OF CELLULOSE
;
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS
;
REGENERATION OF PULPING LIQUORS
;
TEXTILES
Description:
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 cake 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.
Creation Date:
2022
Language:
English
Source:
esp@cenet
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