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Comparative study on lignocellulose liquefaction in water, ethanol, and water/ethanol mixture: Roles of ethanol and water

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  • Feng, Shanghuan
  • Wei, Rufei
  • Leitch, Mathew
  • Xu, Chunbao Charles

Abstract

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 °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.

Suggested Citation

  • Feng, Shanghuan & Wei, Rufei & Leitch, Mathew & Xu, Chunbao Charles, 2018. "Comparative study on lignocellulose liquefaction in water, ethanol, and water/ethanol mixture: Roles of ethanol and water," Energy, Elsevier, vol. 155(C), pages 234-241.
    • Handle: RePEc:eee:energy:v:155:y:2018:i:c:p:234-241
    DOI: 10.1016/j.energy.2018.05.023
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