title: Optimization of microwave-assisted calcium chloride pretreatment of corn stover.
abstract: A 62.5% (w/w) CaCl(2) solution was used in the microwave pretreatment of corn stover. The central composite design (CCD) of response surface methodology (RSM) was employed to design and optimize the CaCl(2)-assisted microwave pretreatment (CaCl(2)-pretreatment). Temperature and time were the main factors affecting the enzymatic digestibility of corn stover. After CaCl(2)-pretreatment, hemicellulose degradation reached 85.90%, the specific surface area (SSA) increased by 168.93%, cellulose crystallinity index (CrI) decreased by 13.91% compared to untreated corn stover. The optimal conditions for glucose production with the CaCl(2)-pretreatment obtained by CCD were, 162.1 °C, 12 min and solid-to-liquid ratio 10% (w/v). Under these conditions, the enzymatic hydrolysis ratio of cellulose was 90.66% and glucose recovery was 65.47%. This novel process achieved the temperature of about 160 °C necessary for lignocellulose pretreatment under atmospheric pressure using the cheap calcium chloride as the heating medium.
authors.affiliation: National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beiertiao 1, Zhongguancun, Beijing 100190, PR China.
authors.forename: Hongqiang
authors.initials: H
authors.lastname: Li
authors.forename: Jian
authors.initials: J
authors.lastname: Xu
mesh_terms: D056804:Biofuels; D002122:Calcium Chloride / Q000737:chemistry*; D005947:Glucose / Q000378:metabolism; D006868:Hydrolysis; D008872:Microwaves; D008956:Models, Chemical; D011134:Polysaccharides / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors; D003313:Zea mays / Q000737:chemistry*
chemical_list: D056804:Biofuels; D011134:Polysaccharides; C007916:hemicellulose; D005947:Glucose; D002122:Calcium Chloride