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Effects of ionic liquid mixtures on lipid extraction from Chlorella vulgaris

Authors
Choi, Sun-AOh, You-KwanJeong, Min-JiKim, Seung WookLee, Jin-SukPark, Ji-Yeon
Issue Date
5월-2014
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Keywords
Lipid extraction; Chlorella vulgaris; Microalgal oil; Ionic liquid mixtures; 1-Ethyl-3-methyl imidazolium cation
Citation
RENEWABLE ENERGY, v.65, pp.169 - 174
Indexed
SCIE
SCOPUS
Journal Title
RENEWABLE ENERGY
Volume
65
Start Page
169
End Page
174
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/98605
DOI
10.1016/j.renene.2013.08.015
ISSN
0960-1481
Abstract
In this study, pre-biodiesel-production lipid extraction from microalgae (Chlorella vulgaris) was performed. The yield-enhancing effects of ionic liquid blends on the lipid extraction were investigated. The initial fatty acids content of the C vulgaris was 292.2 mg/g cell. The lipid extraction yield using single ionic liquids was compared with the yield obtained with organic solvents and ionic liquid mixtures, respectively. The yield by hexane methanol solvent was 185.4 mg/g cell. Among the 12 ionic liquids, 1-ethyl-3-methyl imidazolium acetate, 1-ethyl-3-methyl imidazolium diethylphosphate, 1-ethyl-3-methyl imidazolium tetrafluoroborate, and 1-ethyl-3-methyl imidazolium chloride showed high (>200.0 mg/g cell) lipid extraction yields. Although the yields of 1-ethyl-3-methyl imidazolium ethyl sulfate and 1-ethyl-3-methyl imidazolium thiocyanate were only 60.5 and 42.7 mg/g cell, respectively, the yield for their mixture (weight ratio of 1:1) was improved to 158.2 mg/g cell. Similarly, whereas the lipid extraction yield of 1-ethyl-3-methyl imidazolium hydrogen sulfate was just 35.2 mg/g cell, that for its mixture with 1-ethyl-3-methyl imidazolium thiocyanate (weight ratio of 1:1) was boosted to 200.6 mg/g cell. Overall, the synergistic effects of the ionic liquid mixtures with different anions improved the lipid extraction yield of C vulgaris. (C) 2013 Elsevier Ltd. All rights reserved.
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