农作物秸秆同步糖化发酵制燃料乙醇条件研究

摘要

用农作物秸秆做原料进行同步糖化发酵制取燃料乙醇,同步糖化发酵的温度不协调以及单批次同步糖化发酵原料用量影响乙醇产量等问题始终制约着工艺的应用.文中进行了主要农作物玉米秸秆和稻草秸秆的3种预处理方式同步糖化发酵和同步糖化发酵工艺过程的补料试验研究.试验结果显示,稀酸预处理稻草粉在液固比为8:1时,同步糖化发酵效果最好,乙醇含量为11.16 g/L,残糖浓度最低为12.07 g/L;补料方式H下乙醇浓度达到最大值10.09 g/L,此补料方式下添加吐温-80、混合菌种时的乙醇产率变化不明显.%Using biomass straws for fuel ethanol synchronous saccharification and fermentation (SSF).Both the coordination of saccharification and fermentation temperature and the initial amount of raw materials for single-batch SSF will affect the ethanol yield.In this paper,the pretreated straws in three methods were used as feedstock for SSF.The test results showed that the straw powder pretreatment with dilute acid in liquid-solid ratio 8:1 was the best,the ethanol content was 11.16 g/L and the lowest residual sugar concentration was 12.07 g/L.With feeding method H the maximum ethanol concentration was 10.09 g/L,when adding Tween-80 and mixed bacteria under this feeding method,therewas no obviously change.