Pretreatment of Corn Stover Using Supercritical CO2 with Water-Ethanol as Co-solvent  

作　　者：吕惠生 任苗苗 张敏华 陈莹 

机构地区：[1]Key Laboratory for Green Chemical Technology of Ministry of Education, Tianjin 300072, China [2]Tianjin University R&D Center for Petrochemical Technology, Tianjin 300072, China

出　　处：《Chinese Journal of Chemical Engineering》2013年第5期551-557,共7页中国化学工程学报（英文版）

摘　　要：Supercritical carbon dioxide,with water-ethanol as co-solvent,was applied to pretreat corn stover to enhance its enzymatic hydrolysis.The efficiency of pretreatment was evaluated by the final reducing sugar yield obtained from the enzymatic hydrolysis of cellulose.Under the operation conditions of pretreatment pressure 15 MPa,temperature 180 ℃ and time 1 h,the optimal sugar yield of 77.8℅ was obtained.Scanning electron microscopy(SEM) and chemical composition analysis were applied to the pretreated corn stover.The results showed that the surface morphology and microscopic structure of pretreated corn stover were greatly changed.After the pretreatment,the contents of hemicellulose and lignin were reduced obviously.Thus more cellulose was exposed,increasing the sugar yield.Supercritical carbon dioxide,with water-ethanol as co-solvent,was applied to pretreat corn stover to enhance its enzymatic hydrolysis.The efficiency of pretreatment was evaluated by the final reducing sugar yield obtained from the enzymatic hydrolysis of cellulose.Under the operation conditions of pretreatment pressure 15 MPa,temperature 180 ℃ and time 1 h,the optimal sugar yield of 77.8℅ was obtained.Scanning electron microscopy（SEM） and chemical composition analysis were applied to the pretreated corn stover.The results showed that the surface morphology and microscopic structure of pretreated corn stover were greatly changed.After the pretreatment,the contents of hemicellulose and lignin were reduced obviously.Thus more cellulose was exposed,increasing the sugar yield.

关 键 词：corn stover supercritical fluid PRETREATMENT lignocellulosic biomass 

分 类 号：TS7[轻工技术与工程—制浆造纸工程] TS193.59