Supercritical ethanol as an enhanced medium for lignocellulosic biomass liquefaction: Influence of physical process parameters
- Authors
- Brand, Steffen; Susanti, Ratna Frida; Kim, Seok Ki; Lee, Hong-shik; Kim, Jaehoon; Sang, Byung-In
- Issue Date
- Sep-2013
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Supercritical ethanol; Liquefaction; Lignocellulosic biomass; Biocrude; Hydrogen donor
- Citation
- ENERGY, v.59, pp.173 - 182
- Indexed
- SCIE
SCOPUS
- Journal Title
- ENERGY
- Volume
- 59
- Start Page
- 173
- End Page
- 182
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/162084
- DOI
- 10.1016/j.energy.2013.06.049
- ISSN
- 0360-5442
- Abstract
- 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.
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