【作者】 邹安； 沈春银； 赵玲； 戴干策；

【Author】 Zou An,Shen Chunyin,Zhao Ling,Dai Gance (State Key Laboratory of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China)

【机构】 华东理工大学化学工程联合国家重点实验室；

【摘要】 采用二步微波预处理方法分离得到了玉米秸秆中的半纤维素、木质素,并进行了玉米秸秆的糖化研究。考察了秸秆粒径、液固比、碱及甘油用量、微波功率与处理时间对半纤维素和木质素得率的影响;探讨了预处理后秸秆的酶水解性能。得到的优化预处理条件为:玉米秸秆粒径40～80目;微波-碱预处理功率116.7W/g、时间10min、液固比20mL/g、碱用量150%(质量分数);微波-甘油预处理功率66.7W/g、处理时间30min、液固比20mL/g、甘油质量浓度100%。试样结果表明:经微波预处理后每10g玉米秸秆最终可得到2.48g半纤维素、0.95g木质素,3.55g还原糖;二步微波预处理不仅能够提取出玉米秸秆中的半纤维素、木质素,而且提高了纤维素水解的酶可及性,实现了组分的分离。更多还原

【Abstract】 In order to actualize component fractionation in corn stover,a two-stage microwave pretreatment method, which includes microwave-alkali pretreatment for hemicelluloses extraction and microwave-glycerine pretreatment for lignin extraction,was studied in a special microwave reactor.The effects of particle size,liquid-to-solid ratio,alkali and glycerine consumption,processing time and microwave power on extraction were investigated respectively.The performance of enzymatic hydrolysis saccharification of microwave pretreated corn stover was studied also.The results showed that the liquid-to-solid ratio 20 mL/g,alkali consumption 150%wt,treatment time 10min,microwave power 116.7 w/g and the particle size 40-80 mesh were appropriate parameters for hemicelluloses extraction with microwave-alkali pretreatment;while the liquid-to-solid ratio 20 mL/g,pure glycerine as solvent,treatment time 30 min, and microwave power 66.7 w/g were found to be optimal for lignin extraction with microwave-glycerine pretreatment. Consequently the extraction products of 2.48 g hemicelluloses,0.95 g lignin and 3.55 g reducing sugars were obtained from every 10 g corn stover in terms of the two optimal conditions.This indicates that the component fractionation of com stover can be accomplished and enzymatic hydrolysis saccharification can be enhanced by two-stage microwave pretreatment method.更多还原