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Organosolv Pretreatment of Sugar Cane Bagasse for Bioethanol Production

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Department of Biotechnology, Engineering School of Lorena, University of São Paulo, São Paulo CEP 12602-810, Brazil
Department of Civil and Environmental Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea
*E-mail: [email protected]. Tel.: +55 12 31595313. Fax: +55 12 31533006.
Cite this: Ind. Eng. Chem. Res. 2017, 56, 14, 3833–3838
Publication Date (Web):March 20, 2017
https://doi.org/10.1021/acs.iecr.7b00079
Copyright © 2017 American Chemical Society

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    Abstract

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    A reduction in glycerol price has been observed in the last years, considering it is a byproduct of biodiesel production. This fact has motivated studies about alternative uses for this compound, as in pretreatment of lignocellulosic biomass to produce ethanol, another biofuel of interest. In this context, glycerol acid-pretreatment of sugar cane bagasse (SCB) was evaluated in terms of temperature (80–120 °C), solid loading (2.5–7.5%), glycerol (85–95%) and acid concentrations (0.5–3%), and reaction time (10–60 min), using a 25–1 factorial design. The cellulose digestibility was further optimized for the variables temperature (120–130 °C), acid/SCB mass ratio (5–15%), and time (20–60 min). The optimal conditions were obtained at 130 °C temperature, 15% acid/SCB mass ratio, and 57.5 min reaction time, yielding a 68.5% digestibility. Moreover, a considerable amount of ethanol, 0.38 g/g biomass (0.57 g/L·h of productivity), was achieved using Saccharomyces cerevisiae, which also shows the efficacy of this pretreatment.

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