Bioresource Technology, Vol.167, 574-577, 2014
Protic acid resin enhanced 1-butyl-3-methylimidazolium chloride pretreatment of Arundo donax Linn.
To improve the cellulose digestibility of energy crop Arudo donax Linn. with cost-efficient, a novel pretreatment of protic acid resin Amberlyst 35DRY catalyzed inexpensive ionic liquid (IL) 1-butyl-3-methylimidazolium chloride ([C(4)mim]Cl) was developed in this work. The pretreatment was performed at 160 degrees C with [C(4)mim]Cl for 1.5 h, followed by Amberlyst 35DRY catalyzed at 90 degrees C for 1 h. The IL-Amberlyst pretreatment was demonstrated to be effective, evidenced by the reduction in cellulose crystallinity (31.4%) and increased porosity caused by extensive swelling the undissolved biomass and partial depolymerization of the longer cellulose chain of the dissolved biomass by Amberlyst. Consequently, a higher glucose yield (92.8%) was obtained than for the single [C(4)mim]Cl pretreatment (42.8%) at an enzyme loading of 20 FPU/g substrate. Overall, the enhanced pretreatment was competitive by using inexpensive and recyclable IL-Amberlyst 35DRY pretreated system with shorter processing time and reduced enzyme usage. (C) 2014 Elsevier Ltd. All rights reserved.
Keywords:Arundo donax Linn.;IL-Amberlyst pretreatment;Depolymerization;Enzymatic hydrolysis;Cost-efficient