Journal
BIOMASS & BIOENERGY
Volume 46, Issue -, Pages 479-491Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.biombioe.2012.07.011
Keywords
Lignin; Hydrothermal liquefaction; Subcritical water; Reaction pathway; Alkylation; Analytical characterization
Funding
- Enerbio Fund of the Tuck Foundation
- IFP Energies Nouvelles
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The hydrothermal conversion takes advantage of the singular physico-properties of the hot and compressed water which can be considered as a green solvent. The hydrothermal conversions of an alkali lignin and of phenolic model compounds (vanillin, monobenzone, 2,2'-biphenol) have been studied at 370 and 390 degrees C, at 25 MPa between 5 and 40 min. Polydispersity of products in term of both chemical structures and molecular weights has been characterized through a new analytical approach combining chromatographic (GC) and spectrometric techniques (Fourier transform ion cyclotron mass spectrometry FT-ICR/MS, NMR). From our experiments, it is clear that lignin conversion occurs via a complex reaction pathway where competitive fragmentation and condensation reactions occur. An original reaction pathway has been suggested from the main emphasized reactions. (C) 2012 Elsevier Ltd. All rights reserved.
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