玉米芯经酸-超声波强化碱耦合预处理制取燃料乙醇  

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

作　　者：严青[1] 仲兆平[1] 张茜芸[1] 

机构地区：[1]东南大学能源与环境学院,能源热转换及其过程测控教育部重点实验室,江苏南京210096

出　　处：《环境科学研究》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)

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.

关 键 词：玉米芯 酸碱耦合 超声波 酶解 燃料乙醇 

分 类 号：X705[环境科学与工程—环境工程]