摘要
纤维素乙醇预处理过程效率偏低是影响纤维素乙醇发展的一个重要因素。通过改进传统蒸汽爆破预处理方法,在蒸汽爆破前加入稀酸浸渍,有效地提高了后续同步糖化发酵的水平。采用硫酸浸渍气爆预处理后的草浆同步糖化发酵乙醇质量浓度达到27.5 g/L,达到葡萄糖乙醇理论产率的81%;采用乙酸浸渍气爆预处理后的草浆同步糖化发酵乙醇质量浓度达到25.5 g/L,达到葡萄糖乙醇理论产率的77%;相比传统气爆草浆用于同步糖化发酵,稀酸预处理能有效地减少抑制物的生成,提高后续直接利用草浆进行同步糖化发酵的水平,从而提高生产效率,降低生产成本,是可应用于工业化纤维素乙醇生产的重要方法。
Ethanol produced by lignocellulose takes the most attention of the fuel ethanol. The low efficiency of the pretreatment process limits the development of cellulosic ethanol. In this study, the traditional steam explosion pretreatment process is improved by introducing dilute acid impregnation, which enhances the simultaneous saccharification and fermentation （SSF） of cellulosic ethanol effectively. The final ethanol concentration after the SSF using sulfuric acid and acetic acid impregnation reaches 27. 5 g/L and 25.5 g/L, respectively, which corresponds to 81% and 77% of the theoretical ethanol yield as well. However, by using the traditional steam explosion pretreatment, the final ethanol concentration is only 17.5 g/L, which is 63% of the theoretical ethanol yield. Compared with the traditional steam explosion pretreatment, dilute acid impregnation can effectively improve the result of steam explosion pretreatment and reduce the formation of the inhibitors, thereby increasing the production efficiency and reducing costs. This new method has potential to be applied to the industrialized production of cellulosic ethanol.
出处
《现代化工》
CAS
CSCD
北大核心
2013年第3期46-49,共4页
Modern Chemical Industry
