Highly Efficient Liquefaction of Woody Biomass in Hot-Compressed Alcohol−Water Co-solvents
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- 作者：Shuna Cheng ; Ian D’ ; cruz ; Mingcun Wang ; Mathew Leitch ; Chunbao (Charles) Xu
- 刊名：Energy & Fuels
- 出版年：2010
- 出版时间：September 16, 2010
- 年：2010
- 卷：24
- 期：9
- 页码：4659-4667
- 全文大小：888K
- 年卷期：v.24,no.9(September 16, 2010)
- ISSN：1520-5029
文摘
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 °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 °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 °C and into crystalline carbon at about 350 °C.