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Frontiers of Chemical Science and Engineering

2019, Volume 13,  Issue 1, Pages 140-151
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    Detoxification and concentration of corn stover hydrolysate and its fermentation for ethanol production

    1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
    2. Chembrane Engineering & Technology, Inc., Tianjin 300308, China

    Received： 22 May 2018 Revised： Accepted：02 Mar 2018 Available online：25 Feb 2019
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    10.1007/s11705-018-1714-y
    Cite this article
    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[J].Frontiers of Chemical Science and Engineering,2019,13(1):140-151.

    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.

    Keywords

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