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Characterization of hydrothermal liquefaction products from coconut shell in the presence of selected transition metal chlorides

Cited 14 time in Web of Science Cited 14 time in Scopus
Authors
최준원; Lee, Jae Hoon; Hwang, Hyewon; Moon, Jaegwan; Choi, Joon Weon
Issue Date
2016-02
Publisher
ELSEVIER SCIENCE BV
Citation
Journal of Analytical and Applied Pyrolysis, Vol.122, pp.415-421
Keywords
자연과학Hydrothermal liquefactionTransition metal chloridesHTL oilCoconut shellLevulinic acidγ-Valerolactone
Abstract
Subcritical hydrothermal liquefaction (HTL) of coconut shell (CCNS) was carried out in a batch-type reactor at varying temperatures (240, 270, 300, and 330 °C) in the presence of transition metal chlorides (ZnCl2, CuCl2, and NiCl2) under high pressure (∼22 MPa) and N2 atmosphere. The mass balance and properties of essential HTL products including crude-like oil (HTL oil), char, and the water-soluble fraction (WSF) were investigated. Yields of HTL oil increased with rising temperature and the highest yield of 13.9 wt% was obtained at 300 °C. The water content and total acid number (TAN) of HTL oil were in the range of 3.0–9.6% and 98–190 mg KOH/g, respectively. Transition metal chlorides (2.5–10.0% (w/w sample)) were added as catalysts, and HTL oil yield decreased significantly at higher metal doses. The amounts of gas, WSF, and char were diverse by transition metal type. Compared with the physicochemical features of HTL oil without the addition of transition metals, water content increased up to 11.8% (for 10.0% CuCl2), but the TAN decreased. Levulinic acid (LA) and γ-Valerolactone (GVL), main decomposition products of cellulose, were generally detected in HTL oil. HTL oil obtained with CuCl2 had a relatively low GVL yield as well as a high LA yield compared with HTL oil obtained with ZnCl2 and NiCl2. Experiments using a model compound (cellulose) tentatively confirmed that hydrogenation/dehydration of LA into GVL might be disrupted by Cu2+ ionized from CuCl2 under acidic hydrothermal conditions.
ISSN
0165-2370
Language
English
URI
https://hdl.handle.net/10371/116947
DOI
https://doi.org/10.1016/j.jaap.2016.11.005
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Graduate School of International Agricultural Technology (국제농업기술대학원)Dept. of International Agricultural Technology (국제농업기술학과)Journal Papers (저널논문_국제농업기술학과)
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