Production of low ash lignin

Details Production of low ash lignin Production of low ash lignin

1988-10-21

1990-08-07

Nielsen, Earl

Chemistry: natural resins or derivatives; peptides or proteins;

Lignins or derivatives

C07G 100

Patent

active

049469460

ABSTRACT:
A process for the production of lignin in which lignin is precipitated from aqueous solution by acidification and agitation and the precipitated lignin is separated from accompanying liquid in which the lignin-containing solution and the acid are introduced by simultaneous cocurrent flow into an agitated mixing region, the precipitated lignin is separated not more than 60 minutes after precipitation and the separated lignin is subsequently washed. The process can form a step in a general process for the treatment of lignocellulosic materials to produce one or more products including lignin. The process enables the ash content of lignin to be reduced.

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Chemical Abstracts, vol. 94, No. 2, 1981, p. 221, Abstract No. 7291v, Columbus, OH, U.S.A.; A. M. Prabhu et al.: "Studies on Electrodialytic Recovery and Decationization of Lignin from Kraft Black Liquor", and Proc. Int. Symp. Fresh Water Sea 1980, 7th (vol. 2), 425-432.

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