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Energies 2018, 11(2), 404; https://doi.org/10.3390/en11020404

Deacetylation Followed by Fractionation of Yellow Poplar Sawdust for the Production of Toxicity-Reduced Hemicellulosic Sugar for Ethanol Fermentation

1
Department of Biomolecular and Chemical Engineering, Hankyong National University, Anseong, Gyeonggi-do 17579, Korea
2
Department of Materials Science and Chemical Engineering, Hanyang University, Ansan, Gyeonggi-do 15588, Korea
3
Department of Chemical Engineering, Dankook University, Yongin, Gyeonggi-do 16890, Korea
4
R&D Center, SugarEn Co., Ltd., Yongin, Gyeonggi-do 16890, Korea
*
Author to whom correspondence should be addressed.
Received: 25 January 2018 / Revised: 7 February 2018 / Accepted: 7 February 2018 / Published: 9 February 2018
(This article belongs to the Section Sustainable Energy)
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Abstract

In order to produce bioethanol from yellow poplar sawdust without detoxification, deacetylation (mild alkali treatment) was performed with aqueous ammonia solution. To select the optimal conditions, deacetylation was carried out under different conditions: NH4OH loading (2–10% (w/v)) and a solid-to-liquid ratio of 1:4–1:10 at 121 °C for 60 min. In order to assess the effectiveness of deacetylation, fractionation of deacetylated yellow poplar sawdust was performed using dilute acid (H2SO4, 0.5–2.0% (w/v)) at a reaction temperature of 130–150 °C for 10–80 min. The toxicity-reduced hemicellulosic hydrolyzates that were obtained through a two-step treatment at optimized conditions were fermented using Pichia stipitis for ethanol production, without any further detoxification. The maximum ethanol production was 4.84 g/L, corresponding to a theoretical ethanol yield of 82.52%, which is comparable to those of intentionally made hydrolyzates as controls. View Full-Text
Keywords: biomass; deacetylation; pretreatment; xylose; Pichia stipitis; acetic acid biomass; deacetylation; pretreatment; xylose; Pichia stipitis; acetic acid
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Kim, S.J.; Kim, T.H.; Oh, K.K. Deacetylation Followed by Fractionation of Yellow Poplar Sawdust for the Production of Toxicity-Reduced Hemicellulosic Sugar for Ethanol Fermentation. Energies 2018, 11, 404.

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