title: Pretreatment of rice straw using a butanone or an acetaldehyde dilute solution explosion for producing ethanol.
abstract: Ethanol conversion from rice straw using butanone and acetaldehyde dilute solution explosions was evaluated based on the optimization of pure water explosion. To decrease residual inhibitor content, the exploded slurry was dried and investigated at different temperature. Using a 0.9-mol/L butanone solution explosion, with the explosion pressure set at 3.1 MPa, the residence time at 7 min, the dried rice straw-to-water ratio at 1:3 (w/w), and the exploded slurry drying temperuture at 90 °C for 8 h, the yields of total sugar, glucose, and xylose were 85%, 88%, 82% (w/w), respectively, and the ethanol productivity was 26.0 g/100 g rice straw dry matter. Moreover, 0.5-mol/L acetaldehyde dilute solution explosion improved the efficiency of enzymatic hydrolysis (EH) and simultaneous saccharification and co-fermentation (SSCF), and the residual inhibitors had negligible effects on EH and SSCF after detoxification by drying. The results suggested that compared with pure water explosions, the use of butanone and of acetaldehyde dilute solution explosions lowered the explosive temperature and improved the sugar yield, although relative crystallinity of the rice straw dry matter was increased after the explosion.
authors.affiliation: College of Light Industry, Textile and Food Engineering, Sichuan University, Chengdu, Sichuan 610065, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Zhang
authors.forename: Wen-Xue
authors.initials: WX
authors.lastname: Zhang
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: Zheng-Yun
authors.initials: ZY
authors.lastname: Wu
authors.forename: Kenji
authors.initials: K
authors.lastname: Kida
authors.forename: Yu
authors.initials: Y
authors.lastname: Deng
mesh_terms: D000079:Acetaldehyde / Q000737:chemistry*; D056804:Biofuels; D002074:Butanones / Q000737:chemistry*; D002175:Candida / Q000378:metabolism; D003890:Desiccation; D000431:Ethanol / Q000378:metabolism*; D005107:Explosions; D005285:Fermentation; D005947:Glucose / Q000378:metabolism; D006868:Hydrolysis; D012275:Oryza / Q000378:metabolism*; D035261:Plant Components, Aerial / Q000378:metabolism*; D011312:Pressure; D012441:Saccharomyces cerevisiae / Q000378:metabolism; D012996:Solutions; D013227:Steam; D013696:Temperature; D014866:Waste Products; D014867:Water / Q000737:chemistry*; D014994:Xylose / Q000378:metabolism
chemical_list: D056804:Biofuels; D002074:Butanones; D012996:Solutions; D013227:Steam; D014866:Waste Products; D014867:Water; D000431:Ethanol; D014994:Xylose; D000079:Acetaldehyde; D005947:Glucose