期刊
ENERGY
卷 155, 期 -, 页码 234-241出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2018.05.023
关键词
Water/ethanol mixture; Lignocellulosic biomass liquefaction; Bio-crude; Solid residue
资金
- Natural Science and Engineering Research Council of Canada (NSERC) through the Discovery Grant
- Ontario Ministry of Economic Development and Innovation via the Ontario Research Foundation (ORF) for Bark Biorefinery project
- FP innovation
- Woodbridge Group
- Huntsman
- Arclin
- Tembec
- Resolute
- St. Marys Paper Corp
- Sault STE and MARIE Innovation centre
- Research Fund for Young Teachers of Anhui University of Technology [QZ201604]
This study aimed to investigate the roles of ethanol and water in the water/ethanol mixed solvent in liquefaction of lignocellulose biomass. To this end, an organosolv lignin, cellulose, cellulose/lignin (50:50, w/w) mixture and an acetone extracted white birch bark (EWBB) were comparatively liquefied in pure water, water/ethanol mixture (50:50, v/v) and pure ethanol at fixed condition (300 degrees C and 15 min). It was demonstrated that biomass liquefaction efficiency in three reaction media with respect to the bi-crude yield followed the order of water/ethanol mixed solvent pure water > pure ethanol regardless of the feedstocks. Cellulose derived bio-crudes mainly contained esters, furfurals and furfurals derivatives, and carboxylic acid substantially existed in the bio-crude from cellulose liquefaction in water, while lignin derived bio-crude mainly contained aromatics, as expected. It was found that hot-compress water accelerated biomass depolymerization by hydrolyzing cellulose/hemi-cellulose, while on the other hand ethanol promoted lignin degradation by dissolving the de-polymerized lignin products and hence prevented the repolymerization of the reaction intermediates. In addition, the mixed ethanol-water solvent increased the permeation of the solvent into the lignocellulose biomass structure, and increased the solubility of liquefaction intermediates, hence contributing to a higher bio-crude yield in liquefaction of lignocellulose biomass. (C) 2018 Elsevier Ltd. All rights reserved.
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