Pretreatment of rice hulls by ionic liquid dissolution

► EMIM Ac, HMIM Cl, and AMIM Cl ionic liquid effect on rice hulls. ► EMIM Ac separates out lignin and hemicellulose, leaving cellulose-rich residue. ► Rice hull ash removal correlates with hemicellulose removal. As a highly available waste product, rice hulls could be a starting block in replacing l...

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Bibliographic Details
Published in:Bioresource technology 2012-06, Vol.114, p.629-636
Main Authors: Lynam, Joan G., Toufiq Reza, M., Vasquez, Victor R., Coronella, Charles J.
Format: Article
Language:English
Subjects:
Cellulose
Ethanol - metabolism
Fractional Precipitation - methods
Hemicellulose
Ionic Liquids - chemistry
Lignin
Oryza - chemistry
Oryza - microbiology
Pretreatment
Rice husks
Seeds - chemistry
Seeds - microbiology
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Summary:► EMIM Ac, HMIM Cl, and AMIM Cl ionic liquid effect on rice hulls. ► EMIM Ac separates out lignin and hemicellulose, leaving cellulose-rich residue. ► Rice hull ash removal correlates with hemicellulose removal. 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°C for 8h was found to completely remove lignin from rice hulls, while ethanol was capable of precipitating lignin out of the used EMIM Ac. With 8h dissolution at 110°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.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2012.03.004