Separation of Lignin From Lignocellulosic Materials
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United States of America Patent
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Issued Date -
Oct 20, 2011
app pub date -
Apr 18, 2011
filing date -
Apr 19, 2010
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Abandoned
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Abstract
A method is described for separating lignin from liquid solutions resulting from the pretreatment of lignocellulosic materials such as switchgrass with ammonium hydroxide. The method involves a sequence of steps including acidification, evaporation, and precipitation or centrifugation that are performed under defined conditions, and results in a relatively pure, solid lignin product. The method is tested on ammonium hydroxide solutions containing lignin extracted from switchgrass. Experimental results show that the method is capable of recovering between 66-95% of dissolved lignin as a precipitated solid.
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