Journal
BIORESOURCE TECHNOLOGY
Volume 114, Issue -, Pages 629-636Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2012.03.004
Keywords
Rice husks; Pretreatment; Lignin; Cellulose; Hemicellulose
Funding
- Nevada Renewable Energy Consortium
- DOE [DE-EE 0000272]
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As a highly available waste product, rice hulls could be a starting block in replacing liquid fossil fuels. However, their silica covering can make further use difficult. This preliminary study investigates effects of dissolving rice hulls in the ionic liquids 1-ethyl-3-methylimidazolium acetate (EMIM Ac), 1-hexyl-3-methylimidazolium chloride, (HMIM Cl), and 1-allyl-3-methylimidazolium chloride (AMIM Cl), and what lignocellulosic components can be precipitated from the used ionic liquid with water and ethanol. EMIM Ac dissolution at 110 degrees C for 8 h was found to completely remove lignin from rice hulls, while ethanol was capable of precipitating lignin out of the used EMIM Ac. With 8 h dissolution at 110 degrees C using HMIM Cl, approximately 20% of the cellulose in the rice hull sample can be precipitated out using water as co-solvent, while more than 60% of the hemicellulose can be precipitated with ethanol. (C) 2012 Elsevier Ltd. All rights reserved.
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