Brand, Steffen Susanti, Ratna Frida Kim, Seok Ki Lee, Hong-shik Kim, Jaehoon Sang, Byung-In 2024-01-20T11:32:37Z 2024-01-20T11:32:37Z 2022-01-10 2013-09-15 0360-5442 https://pubs.kist.re.kr/handle/201004/127663 In this study, the influence of various physical process parameters on the liquefaction of lignocellulosic biomass (pine wood) in supercritical ethanol was investigated. The parameters include reaction temperature (280-400 degrees C), initial nitrogen pressure (0.4-7.5 MPa), reaction time (0-240 min), and biomass-to-solvent ratio (0.06-0.25 g/g). The reaction temperature and residence time were found to have a more significant effect on biomass conversion and product yield than pressure and biomass-to-solvent ratio had; conversion in the range 34.0-98.1% and biocrude yield in the range 15.8-59.9 wt% were observed depending on the process parameters. Despite the absence of catalysts and external hydrogen source, solid biomass to liquid and gaseous products conversion of 98.1%, and a high biocrude yield of approximately 65.8 wt% were achieved at 400 degrees C, 120 min, and a biomass-to-solvent ratio of 0.06 g/g. Moreover, the biocrude contained considerably lower amounts of oxygen and higher amounts of carbon and hydrogen, resulting in a substantially higher heating value (>30 MJ/kg) as compared to raw feed-stock (20.4 MJ/kg). A comparison with sub- or supercritical water-based liquefaction revealed that supercritical ethanol produced biocrude with a lower molecular weight and much better yield. Finally, a new biomass liquefaction reaction mechanism associated with supercritical ethanol is proposed. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD PROMOTED H-DONATION COAL CONVERSION OIL PRODUCTS DONOR MEDIA WATER WOOD ALCOHOLS LIGNIN SOLVENTS SLUDGE Supercritical ethanol as an enhanced medium for lignocellulosic biomass liquefaction: Influence of physical process parameters Article 10.1016/j.energy.2013.06.049 1 ENERGY, v.59, pp.173 - 182 ENERGY 59 173 182 scie scopus 000324787600017 2-s2.0-84883277396 Thermodynamics Energy & Fuels Thermodynamics Energy & Fuels Article PROMOTED H-DONATION COAL CONVERSION OIL PRODUCTS DONOR MEDIA WATER WOOD ALCOHOLS LIGNIN SOLVENTS SLUDGE Supercritical ethanol Liquefaction Lignocellulosic biomass Biocrude Hydrogen donor