Detoxification and concentration of corn stover hydrolysate and its fermentation for ethanol production

Qing Li, Yingjie Qin, Yunfei Liu, Jianjun Liu, Qing Liu, Pingli Li, Liqiang Liu

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Front. Chem. Sci. Eng. ›› 2019, Vol. 13 ›› Issue (1) : 140-151. DOI: 10.1007/s11705-018-1714-y
RESEARCH ARTICLE

Detoxification and concentration of corn stover hydrolysate and its fermentation for ethanol production

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Abstract

Environmental and energy concerns have increased interest in renewable energy sources, particularly biofuels. Thus the fermentation of glucose from sulfuric acid-hydrolyzed corn stover for the production of bioethanol has been explored using a combined acid retardation and continuous-effect membrane distillation treatment process. This process resulted in the separation of the sugars and acids from the acid-catalyzed hydrolysate, the removal of most of the fermentation inhibitors from the hydrolysate and the concentration of the detoxified hydrolysate. The recovery rate of glucose from the sugar-acid mixture using acid retardation was greater than 99.12% and the sulfuric acid was completely recovered from the hydrolysate. When the treated corn stover hydrolysate, containing 100 g/L glucose, was used as a carbon source, 43.06 g/L of ethanol was produced with a productivity of 1.79 g/(L∙h) and a yield of 86.31%. In the control experiment, where glucose was used as the carbon source these values were 1.97 g/(L∙h) and 93.10% respectively. Thus the integration of acid retardation and a continuous-effect membrane distillation process are effective for the production of fuel ethanol from corn stover.

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Keywords

corn stover / hydrolysate / acid retardation / continuous-effect membrane distillation / ethanol fermentation

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Qing Li, Yingjie Qin, Yunfei Liu, Jianjun Liu, Qing Liu, Pingli Li, Liqiang Liu. Detoxification and concentration of corn stover hydrolysate and its fermentation for ethanol production. Front. Chem. Sci. Eng., 2019, 13(1): 140‒151 https://doi.org/10.1007/s11705-018-1714-y

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Acknowledgments

The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China (Grant No. 21376175).

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2018 Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature
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