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Co-liquefaction of microalgae and lignocellulosic biomass in subcritical water

  • Gai, Chao
  • Li, Yi
  • Peng, Nana
  • Fan, Aonan
  • Liu, Zhengang
Publication Date
Jun 01, 2015
Institutional Repository of Institute of Process Engineering, CAS (IPE-IR)
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This study investigated co-liquefaction of microalgae (Chlorella pyrenoidosa, CP) and lignocellulosic biomass (Rice husk, RH) in subcritical water for bio-oil production. The effects of liquefaction temperature (200-350 degrees C), residence time (10-90 min), solid concentration (10-30 wt.%) and mass ratio of CP/RH on product distribution were investigated. The results showed that the highest yield of bio-crude oils at the combination of 50% CP with 50% RH was obtained at 300 degrees C temperature, 60 min residence time and 20 wt.% solid concentration. The oil yields increased gradually with the increased mass ratio of CP/RH. The major compounds identified in bio-crude oils from hydrothermal liquefaction (HTL) of RH were cyclic oxygenates (20.62%), followed by esters, ketones and alcohols (17.19%). As for CP, the main components were straight & branched amides (28.38%). A synergistic interaction was observed between CP and RH during co-liquefaction, resulting in decreased acidity and nitrogen content of bio-crude oils. (C) 2015 Elsevier Ltd. All rights reserved.

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