A METHOD FOR PURIFYING LIGNIN BY REMOVING INORGANIC IMPURITIES FROM BLACK LIQUOR

The present invention relates to a method for purifying lignin. The method comprises the steps of: providing alkaline black liquor; removing inorganic impurities from the black liquor to obtain purified black liquor; acidifying the purified black liquor to precipitate lignin; separating the precipit...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	HAMAGUCHI, Marcelo, SAMUELSSON, Åsa, WADSBORN, Rickard, TOLONEN, Lasse, BJÖRK, Maria
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS THEREFOR CHEMISTRY COMPOSITIONS BASED THEREON DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PAPER-MAKING PRODUCTION OF CELLULOSE PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS REGENERATION OF PULPING LIQUORS TEXTILES THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	The present invention relates to a method for purifying lignin. The method comprises the steps of: providing alkaline black liquor; removing inorganic impurities from the black liquor to obtain purified black liquor; acidifying the purified black liquor to precipitate lignin; separating the precipitated lignin from the acidified purified black liquor; mixing the precipitated lignin with an acidic solution so as to remove inorganic impurities from the precipitated lignin and obtain purified lignin; and separating the obtained purified lignin from the acidic solution. The content of inorganic impurities in the purified lignin is reduced by the method according to the present invention.