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A new role of supercritical ethanol in macroalgae liquefaction (Saccharina japonica): Understanding ethanol participation, yield, and energy efficiency

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  • Zeb, Hassan
  • Choi, Jaeyeon
  • Kim, Yunje
  • Kim, Jaehoon

Abstract

Liquefaction of macroalgae was performed in a stirred autoclave reactor using supercritical ethanol (scEtOH) as a solvent. There was a sharp transition in ethanol consumption during macroalgae liquefaction in scEtOH when the temperature was increased from 350 to 400 °C. At 350 °C, a small amount of ethanol (6 wt%) reacted with intermediates, while at 400 °C, 18 wt% of the ethanol was consumed. Taking into account this increased consumption of ethanol at 400 °C, the bio-oil yield decreased from 79.2 to 53.9 wt%, energy recovery from 202.5% to 72.2%, and energy efficiency from 111.6% to 62.7%. The produced bio-oil had a molecular weight of 398 g mol−1, a HHV of 36.49 MJ kg−1, an O/C ratio of 0.12, and a H/C ratio of 1.58. To confirm the unique role of scEtOH in biomass liquefaction, subcritical water (subH2O) and supercritical water (scH2O)-based liquefactions were carried out and the results compared with those obtained for scEtOH-based liquefaction. GC-MS results from the bio-oil produced with scH2O revealed the percentage area of compounds containing an ethoxy group to be as low as 20%, while this value reached 62% when using scEtOH.

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  • Zeb, Hassan & Choi, Jaeyeon & Kim, Yunje & Kim, Jaehoon, 2017. "A new role of supercritical ethanol in macroalgae liquefaction (Saccharina japonica): Understanding ethanol participation, yield, and energy efficiency," Energy, Elsevier, vol. 118(C), pages 116-126.
    • Handle: RePEc:eee:energy:v:118:y:2017:i:c:p:116-126
    DOI: 10.1016/j.energy.2016.12.016
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    References listed on IDEAS

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