METHOD FOR PRODUCING HIGH PURITY LIGNIN

USPTO Patent Application US 2017/0355723 A1
Application Date: Dec. 14th, 2017

ABSTRACT

The method is for separation of lignin from original black liquor (BLIN) that has a first precipitation stage (PR) for precipitation of lignin by a first acidification using acidifier AC1,...
Application Number:
15/648,661
International Classification:
C07G 1/00 (20110101); D21C 11/00 (20060101)
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CLAIMS

I claim:

1. A method for separation of lignin from original black liquor (BLIN) having a first alkaline pH value, comprising the following stages in sequence: in a first precipitation stage (PR), adding an acidifier charge to an original black liquor in order to decrease a pH value of the original black liquor...

DESCRIPTION

PRIOR APPLICATIONS

This is a continuation-in-part patent application that claims priority from U.S. national phase patent application Ser. No. 14/761,525, filed 16 Jul., 2015, that claims priority from International Patent Application No. PCT/SE2013/050051, on 24 Jan. 2013.
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