作　　者： ; ;

机构地区： 沈阳农业大学工程学院

出　　处： 《可再生能源》 2012年第7期51-53,共3页

摘　　要： 利用从4组混合乙醇酵母中筛选出的优势混合酵母,对玉米秸秆酶解糖化液的乙醇发酵工艺过程进行了优化试验。试验结果表明,管囊酵母和酿酒酵母组成的混合酵母具有较高的乙醇发酵能力,经60 h发酵,乙醇浓度最高可达12.55 g/L,乙醇产率为最大理论值的68.63%。根据对糖化液乙醇发酵的二次回归正交组合优化试验,当发酵温度为28.0℃,初始pH为5.2,接种量为8.1%时,实际乙醇浓度最高可达13.03g/L,乙醇产率为0.36 g/g,为最大理论值的70.59%,与所得乙醇发酵回归方程预测值基本相符。 In this paper, the advanced mix-yeast was chosen out from four groups of mixed yeasts,it was used in the process optimization of ethanol fermentation on maize straw enzymatic saccharification liquid. The test results showed the mixed yeasts composed by P. tannophilus and S.cerevisiae had the hightest ethanol fermentation capacity. After 60 hours fermentation the highest ethanol concentration was 12.55 g/L, corresponding to 68.63% of theoretical ethanol yield.According to the result of quadratic regression combinatorial design, fermentation temperature was 28.0 ℃, initial pH value was 5.2, inoeulum amount was 8.1%,under these conditions, the actual ethanol concentration was 13.03 g/L, the ethanol yield was 0.36 g ethanol/g sugar, corresponding to 70.59% of theoretical ethanol yield, which was almost conform with the predictive value of regression equation.

关 键 词： 玉米秸秆酶解糖化液 乙醇发酵 混合酵母 工艺优化

领　　域： [动力工程及工程热物理] [农业科学] [农业科学]