Highly Efficient Liquefaction of Woody Biomass in Hot-Compressed Alcohol-Water Co-solvents

被引:276
作者
Cheng, Shuna [1 ,2 ]
D'cruz, Ian [1 ]
Wang, Mingcun [1 ]
Leitch, Mathew [2 ]
Xu, Chunbao [1 ]
机构
[1] Lakehead Univ, Dept Chem Engn, Thunder Bay, ON P7B 5E1, Canada
[2] Lakehead Univ, Fac Forestry & Forest Environm, Thunder Bay, ON P7B 5E1, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
LIGNIN MODEL-COMPOUND; CATALYZED LIQUEFIED WOOD; HIGH-TEMPERATURE; SUPERCRITICAL WATER; HYDRO-LIQUEFACTION; REACTION-PRODUCTS; PHENOL; ACID; CELLULOSE; CONVERSION;
D O I
10.1021/ef901218w
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
080707 [能源环境工程]; 082001 [油气井工程];
摘要
Alcohol (methanol or ethanol) and water showed synergistic effects on biomass direct liquefaction, and the 50 wt % co-solvent of either methanol-water or ethanol-water was found to be the most effective solvent for the liquefaction of eastern white pine sawdust. The 50 wt % aqueous alcohol at 300 degrees C for 15 min produced a bio-oil yield at approximately 65 wt % and a biomass conversion of >95%. At a temperature higher than 300 degrees C, conversion of bio-oil to char was significant by repolymerization. The Fourier transform infrared spectroscopy (FTIR) and gas chromatography-mass spectrometry (GC-MS) analyses of the obtained bio-oils confirmed the presence of primarily phenolic compounds and their derivatives (such as benzenes), followed by aldehyde, long-chain (and cyclic) ketone and alcohol, ester, organic acid, and ether compounds. Gel permeation chromatography (GPC) results suggested that hot-compressed ethanol as the liquefaction solvent favored lignin degradation into monomeric phenols. The X-ray diffraction (XRD) patterns of sawdust before and after the liquefaction displayed that the cellulosic structure of the feedstock was completely converted into amorphous carbon at around 300 degrees C and into crystalline carbon at about 350 degrees C.
引用
收藏
页码:4659 / 4667
页数:9
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