文献类型：期刊文献

英文题名：Helically agitated mixing in dry dilute acid pretreatment enhances the bioconversion of corn stover into ethanol

作者：He, Yanqing[1];Zhang, Longping[1];Zhang, Jian[1];Bao, Jie[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China

年份：2014

卷号：7

期号：1

外文期刊名：BIOTECHNOLOGY FOR BIOFUELS

收录：;EI(收录号：20140717308021);WOS:【SCI-EXPANDED(收录号:WOS:000332985700001)】；

基金：This research was supported by the National Basic Research Program of China (2011CB707406/2013CB733902), the National High-Tech Program of China (2012AA022301), the Natural Science Foundation of China (21306048), the Fundamental Research Funds for the Central Universities of China (WF0913005/1114054/1214025), the Shanghai Leading Academic Discipline Project (B505), and the State Key Laboratory of Motor Vehicle Biofuel Technology (2013012).

语种：英文

外文关键词：Dry dilute acid pretreatment; Helically agitated mixing; CFD modeling; Simultaneous saccharification and fermentation (SSF); Corn stover; Ethanol

摘要：Background: Dry dilute acid pretreatment at extremely high solids loading of lignocellulose materials demonstrated promising advantages of no waste water generation, less sugar loss, and low steam consumption while maintaining high hydrolysis yield. However, the routine pretreatment reactor without mixing apparatus was found not suitable for dry pretreatment operation because of poor mixing and mass transfer. In this study, helically agitated mixing was introduced into the dry dilute acid pretreatment of corn stover and its effect on pretreatment efficiency, inhibitor generation, sugar production, and bioconversion efficiency through simultaneous saccharification and ethanol fermentation (SSF) were evaluated. Results: The overall cellulose conversion taking account of cellulose loss in pretreatment was used to evaluate the efficiency of pretreatment. The two-phase computational fluid dynamics (CFD) model on dry pretreatment was established and applied to analyze the mixing mechanism. The results showed that the pretreatment efficiency was significantly improved and the inhibitor generation was reduced by the helically agitated mixing, compared to the dry pretreatment without mixing: the ethanol titer and yield from cellulose in the SSF reached 56.20 g/L and 69.43% at the 30% solids loading and 15 FPU/DM cellulase dosage, respectively, corresponding to a 26.5% increase in ethanol titer and 17.2% increase in ethanol yield at the same fermentation conditions. Conclusions: The advantage of helically agitated mixing may provide a prototype of dry dilute acid pretreatment processing for future commercial-scale production of cellulosic ethanol.