Journal
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY
Volume 31, Issue 1, Pages 130-138Publisher
WILEY
DOI: 10.1002/ep.10544
Keywords
bioenergy; lignocellulosic; precipitation; switchgrass
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Funding
- U.S. Department of Energy [DEAC09-08SR22470]
- Savannah River National Laboratory
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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 6695% of dissolved lignin as a precipitated solid. Cost estimates of pilot-scale and industrial-scale expressions of the process indicate that breakeven lignin prices of $2.36/kg and $0.78/kg, respectively, may be obtainable with this recovery method. (C) 2011 American Institute of Chemical Engineers Environ Prog, 2012
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