稻草秸秆同时糖化法产乙醇的动力学研究

摘要

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=k1 t-h .%在纤维素酶20 U/g,发酵温度38℃,接种量15%,管囊酵母和酿酒酵母的接种比例2：1条件下,选择不同的固液比(1：5、1：10、1：15和1：20),研究了稻草秸秆同时糖化法产乙醇的动力学。结果表明：固液比1：15时,获得了较高的乙醇产率为0.183 g/g,方程c=abt/(1+bt)可以被用来描述乙醇浓度(c)与发酵时间(t)的关系,动力学参量a随着固液比减小而减小,而动力学参量b随着固液比的减小而增加；同时,在不同固液比条件下,稻草秸秆转化乙醇反应被证明是类分形的,方程k=k1 t-h能被用来很好的描述速率常数与发酵时间之间的关系。