High Concentration Ethanol Production from Mixed Softwood Sawdust Waste
High Concentration Ethanol Production from Mixed Softwood Sawdust Waste
复制标题
DOI：
10.1007/s12649-017-0073-0
复制
发表时间：
2017-09
影响因子：
3.2
通讯作者：
C. Asada;C. Sasaki;Y. Nakamura
中科院分区：
文献类型：
--
作者：
C. Asada;C. Sasaki;Y. Nakamura
采用35 ~ 55大气压的高压蒸汽爆破预处理方法，将混合软木木屑废渣有效转化为乙醇。结果表明，高蒸汽压力下的蒸汽爆破可以显著提高酶解后的葡萄糖收率和酒精发酵后的乙醇收率。阐明了蒸汽压力对蒸汽爆炸木屑理化特性的影响。为了避免高压蒸汽爆炸产生的抑制物质对酶解糖化和酒精发酵的影响，尝试了水提取和甲醇提取。蒸汽爆炸木屑在蒸汽压力45 atm下蒸制5 min，经水和甲醇萃取后的残渣用于酶解糖化后的酒精发酵最有效，葡萄糖得率最高，为81%。同时使用高浓度的残渣进行糖化和发酵导致乙醇浓度增加，乙醇产量分别为46.0和66.7 g/L，乙醇的体积产率分别为0.64和0.92 g/L h，从200到300 g/L的残渣。
Steam explosion pretreatment with high steam pressures, i.e. 35–55 atm, was conducted for the effective conversion of mixed softwood sawdust waste into ethanol. The results show the steam explosion with high steam pressures can significantly enhance the glucose yield after enzymatic saccharification and ethanol yield after alcohol fermentation. The effects of steam pressure on physical and chemical characteristics of steam-exploded sawdust were also clarified. Avoiding the effect of inhibitory materials produced by steam explosion with high pressures on enzymatic saccharification and alcohol fermentation, water and methanol extractions were attempted. The residue after water and methanol extractions of steam-exploded sawdust at a steam pressure 45 atm for a steaming time of 5 min was the most effective for the enzymatic saccharification followed by alcohol fermentation, and obtained a highest glucose yield, i.e. 81%. Simultaneous saccharification and fermentation using a high concentration of the residue resulted in an increased ethanol concentration and provided an ethanol production, i.e. 46.0 and 66.7 g/L, and a volumetric productivity of ethanol, i.e. 0.64 and 0.92 g/L h, from 200 to 300 g/L residue, respectively.