Methods for separating and refining lignin from black liquor and compositions thereof
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United States of America Patent
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Sep 8, 2020
Grant Date -
May 11, 2017
app pub date -
Jul 7, 2015
filing date -
Jul 9, 2014
priority date (Note) -
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Abstract
The invention relates methods and processes for the separation and refining of lignin from spent cooking liquor, called black liquor, present in industrial chemical plants, and compositions thereof. A process is provided for separating black liquor into at least two, three, or four streams selected from: (i) a gaseous stream comprising volatile sulfur compounds; (ii) a lignin-comprising stream produced by extracting lignin into a limited solubility solvent S1; (iii) a salt stream, comprising solid sodium and sulfate salts; and (iv) a salt-depleted and lignin-depleted aqueous stream comprising hydrocarbons.
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