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Sub- and supercritical liquefaction of rice straw in the presence of ethanol–water and 2-propanol–water mixture

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  • Yuan, X.Z.
  • Li, H.
  • Zeng, G.M.
  • Tong, J.Y.
  • Xie, W.

Abstract

The critical liquefaction of rice straw to bio-oil with sub- and supercritical mixtures (ethanol–water and 2-propanol–water mixture) was studied in a 1000ml autoclave at 533–623K, 6–18MPa, respectively. The results showed that the maximum yield of bio-oil was 39.7% for the 2-propanol:water volume ratio of 5:5 at 573K, while the higher heating value (HHV) of bio-oil increased with the reaction temperature and solvent volume ratio. The formation of low-boiling-point materials was reduced by a mixture. Using a mixture could inhibit the formation of residue and then promote the conversion of rice straw with the ratio of 1:9–5:5. The bio-oil was analyzed by GC/MS and Elemental Analyzer, while the morphological changes of residue were observed by a scanning electron microscope (SEM).

Suggested Citation

  • Yuan, X.Z. & Li, H. & Zeng, G.M. & Tong, J.Y. & Xie, W., 2007. "Sub- and supercritical liquefaction of rice straw in the presence of ethanol–water and 2-propanol–water mixture," Energy, Elsevier, vol. 32(11), pages 2081-2088.
    • Handle: RePEc:eee:energy:v:32:y:2007:i:11:p:2081-2088
    DOI: 10.1016/j.energy.2007.04.011
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