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

Title
A new role of supercritical ethanol in macroalgae liquefaction (Saccharina japonica): Understanding ethanol participation, yield, and energy efficiency
Author
김연제
Keywords
Macroalgae; Supercritical ethanol; Liquefaction; Ethanol quantification; Energy efficiency
Issue Date
2017-01
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ENERGY, v. 118, page. 116-126
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 degrees C. At 350 degrees C, a small amount of ethanol (6 wt%) reacted with intermediates, while at 400 degrees C, 18 wt% of the ethanol was consumed. Taking into account this increased consumption of ethanol at 400 degrees 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 (subH(2)O) and supercritical water (scH(2)O)-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. (C) 2016 Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/abs/pii/S0360544216318205?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/112481
ISSN
0360-5442; 1873-6785
DOI
10.1016/j.energy.2016.12.016
Appears in Collections:
RESEARCH INSTITUTE[S](부설연구소) > RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE(산업과학연구소) > Articles
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