title: A comparison of different dilute solution explosions pretreatment for conversion of distillers' grains into ethanol.
abstract: In order to improve the efficiency of distillers' grains converting to ethanol, 13 dilute solution explosions were evaluated based on the optimization of pure water explosion. To decrease residual inhibitor content, the exploded slurry was dried at 105°C. Using a 1.1 mol/L butanone solution explosion, with the explosion temperature set at 160°C (pressure at 1.9 MPa), the residence time at 10 min, and the dried distillers' grains-to-water ratio at 1:2 (w/w), the yields of total sugar, glucose, and xylose were 86%, 89%, and 84% (w/w), respectively, and the ethanol yield was 25.3 g/100 g distillers' grains dry matter. Moreover, the eight other reagent solution explosions improved the efficiency of enzymatic hydrolysis, and of simultaneous saccharification and co-fermentation, and the residual contents of furfural, 5-hydroxymethylfurfural, and acetic acid decreased to an acceptable concentration range after detoxification by drying. The results suggested that compared with pure water explosions, the use of volatile solutions lowered the explosive temperature and improved the sugar yield. This study offers a reference for the further study of lignocellulosic materials with higher starch and hemicelluloses contents as raw materials for converting biomass to bioethanol.
authors.affiliation: College of Light Industry, Textile and Food Engineering, Sichuan University, Chengdu, Sichuan, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Zhang
authors.forename: Wen-Xue
authors.initials: WX
authors.lastname: Zhang
authors.forename: Zheng-Yun
authors.initials: ZY
authors.lastname: Wu
authors.forename: Jian
authors.initials: J
authors.lastname: Yang
authors.forename: Yue-Hong
authors.initials: YH
authors.lastname: Liu
authors.forename: Xia
authors.initials: X
authors.lastname: Zhong
authors.forename: Yu
authors.initials: Y
authors.lastname: Deng
mesh_terms: D056804:Biofuels; D018533:Biomass; D019149:Bioreactors; D002175:Candida / Q000378:metabolism*; D002480:Cellulase / Q000737:chemistry; D003890:Desiccation; D002523:Edible Grain / Q000378:metabolism*; D043364:Endo-1,4-beta Xylanases / Q000737:chemistry; D000431:Ethanol / Q000378:metabolism*; D005107:Explosions; D005285:Fermentation; D005662:Furaldehyde / Q000031:analogs & derivatives / Q000378:metabolism; D005947:Glucose / Q000378:metabolism; D006868:Hydrolysis; D008031:Lignin / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000378:metabolism*; D013696:Temperature; D014867:Water; D014994:Xylose / Q000378:metabolism; D001617:beta-Glucosidase / Q000737:chemistry
chemical_list: D056804:Biofuels; D014867:Water; D000431:Ethanol; C008046:5-hydroxymethylfurfural; D008031:Lignin; D014994:Xylose; D005662:Furaldehyde; D001617:beta-Glucosidase; D002480:Cellulase; D043364:Endo-1,4-beta Xylanases; D005947:Glucose