玉米芯经酸-超声波强化碱耦合预处理制取燃料乙醇

为研究酸碱耦合和超声波对玉米芯预处理效果的影响,通过成分分析、GC-MS分析、还原糖测定、X射线衍射和Jade软件的计算比较预处理后玉米芯的组成形态、结晶结构特点和酶解得率变化,以获得最佳的预处理条件. 结果表明:酸处理后的滤渣继续进行碱处理时,w(半纤维素)和w(木质素)均可降至14%左右；若在碱处理的同时进行超声波强化,当超声波功率为120 W,作用时间为5 min时,w(木质素)可进一步降至7.86%,酶解得率从34.09%升至37.32%,玉米芯的结晶度从59.79%降至57.46%. 以玉米芯为原料制取燃料乙醇的最佳预处理方式为“酸-超声波强化碱”耦合预处理. 

Production of Bio-Ethanol from Corncobs by Acid-Prior-to-Ultrasound Strengthened Alkali Pretreatment

To investigate the effects of acid-alkali combination and ultrasound pretreatment on ethanol production from corncobs, the composition, crystallinity and saccharification rate of corncobs pretreated by Acid-Prior-to-Ultrasound Strengthened Alkali were tested by component analysis, GC-MS analysis, measurement of reduced sugar concentration, XRD and calculation of Jade. The results indicated that the amounts of both hemicellulose and lignin were reduced to about 14% by acid-prior-to-alkali pretreatment, and the amount of lignin was further reduced to 7.86% when strengthened by ultrasound with a power of 120 W for 5min in the alkali phase. Meanwhile, the saccharification rate was enhanced from 34.09% to 37.32%, and the crystallinity was reduced from 59.79% to 57.46%. These results suggest that the acid-prior-to-ultrasound strengthened alkali method may be employed in corncob pretreatment for ethanol production.