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Chemistry and Industry of Forest Products ›› 2014, Vol. 34 ›› Issue (1): 13-18.doi: 10.3969/j.issn.0253-2417.2014.01.003

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Kinetics of Fuel Ethanol Production by Simultaneous Saccharification and Fermentation of Straw Stalk

CHEN Kun CHEN Kun1,2, XU Long-jun2, YANG Rui1, BI Zhi-ming2, FU Zhi-lei2   

  1. 1. College of Safety Engineering, Chongqing University of Science and Technology, Chongqing 401331, China;
    2. State Key Laboratory of Coal Mine Disaster Dynamics and Control (Chongqing University), Chongqing 400030, China
  • Received:2013-04-11 Online:2014-02-25 Published:2014-03-05

Abstract: The kinetics of fuel ethanol production by simultaneous saccharification and fermentation (SSF) of straw stalk in different solid-liquid ratios (1:5, 1:10, 1:15 and 1:20) was studied. Experimental process parameters were cellulose enzyme 20 U/g, fermentation temperature 38 ℃, inoculum size 15 % and inoculation proportion 2:1 (tube capsule yeast and S. cerevisiae). The results showed that the highest yield of ethanol (0.183 g/g) was obtained when a solid-liquid ratio was 1:15. The relationship between ethanol concentration c and fermentation time t could be described as c=abt/(1+bt). The parameter a decreased with a decreasing solid-liquid ratio, whereas the parameter b increased. The conversion reaction of straw stalk to ethanol under different solid-liquid ratios was fractal-like. The relationship between the rate constant and fermentation time was described in the following equation, i.e., k=k1t-h.

Key words: straw stalk, fuel ethanol, kinetics, fractal-like

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