Journal
JOURNAL OF SUPERCRITICAL FLUIDS
Volume 123, Issue -, Pages 28-39Publisher
ELSEVIER
DOI: 10.1016/j.supflu.2016.12.015
Keywords
Kraft lignin; Hydrothermal conversion; Aromatic monomers; Biocrude; Co-solvent; Injection
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Funding
- Danish Council for Strategic Research (DSF) [1305-00030B]
- Danish Agency for Science, Technology and Innovation [11-118412]
- Marie Curie Career Integration Grant (FP7-PEOPLE-CIG) [321816]
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The hydrothermal conversion of Kraft lignin (6 wt.%) in the presence of K2CO3 (1.7 wt.%) was studied as a function of temperature (T = 280-350 degrees C) and phenol mass fraction. (w(ph) = 0.0-9.7 wt.%). The process was carried out in a new batch reactor with injection of lignin slurry enabling fast heating of the biomass, effective control of reaction pressure, and withdrawal/quenching of the products. An aqueous phase and biocrude were obtained, both containing a broad spectrum of aromatic monomers and dimers. The former group consisted mostly of methoxybenzenes, guaiacols, catechols, and alkylphenols, while the latter included anisolic/phenolic dimers. For a given wph (3.4 wt.%), the total yield of monomeric aromatics (Y-T) was maximized at 320 degrees C. At T =300 degrees C and without phenol, YT was low, whereas it increased steeply up to w(ph) = 6.5 wt.%. (C) 2016 Elsevier B.V. All rights reserved.
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