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Pretreatment Methods for Lignocellulosic Biomass to Ethanol

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  131594712,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: @2013
Authors:   Weitao Zhang, Minliang Yang, Kurt A. Rosentrater
Keywords:   Ammonia CO2 Ethanol Hot water Lignocellulosic biomass Lime Pretreatment

Abstract. With shortage of fossil fuel, ethanol made from biomass has been widely investigated as an alternative to gasoline in recent years. This paper reviews published studies of pretreatment methods on various lignocellulosic materials for ethanol production, and how these methods have been utilized. The methodological approach for this study was to compare pretreatment conditions, reducing sugar yield, enzymatic digestibility, and lignin removal. Results showed that utilization of ammonia as a reagent generally resulted in higher glucose yield in comparison with other methods. Both aqueous ammonia and low moisture anhydrous ammonia (LMAA) methods were highly effective because of the ethanol yields. However, the higher ammonia and water consumption of aqueous ammonia may limit its utilization in industrial production. As a relatively unexplored method, LMAA has the potential to decrease energy costs and achieve higher glucose yields, which may be applied in industry after further investigation.

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