摘要
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.
To investigate the effects of acid-alkali combination and ultrasound pretreatment on ethanol production from corncobs, the composition, crystallinity and saceharifieation 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 5rain in the alkali phase. Meanwhile, the saceharification 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.
出处
《环境科学研究》
EI
CAS
CSCD
北大核心
2012年第9期1011-1015,共5页
Research of Environmental Sciences
基金
国家重点基础研究发展计划(973)项目(2011CB201505)
关键词
玉米芯
酸碱耦合
超声波
酶解
燃料乙醇
corncob
acid-prior-to-alkali
ultrasound
saccharification
bio-ethanol
