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Issue 1, 2008
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Desulfurisation of oils using ionic liquids: selection of cationic and anionic components to enhance extraction efficiency

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Abstract

Extraction of dibenzothiophene from dodecane using ionic liquids as the extracting phase has been investigated for a range of ionic liquids with varying cation classes (imidazolium, pyridinium, and pyrrolidinium) and a range of anion types using liquid–liquid partition studies and QSPR (quantitative structure–activity relationship) analysis. The partition ratio of dibenzothiophene to the ionic liquids showed a clear variation with cation class (dimethylpyridinium > methylpyridinium > pyridinium ≈ imidazolium ≈ pyrrolidinium), with much less significant variation with anion type. Polyaromatic quinolinium-based ionic liquids showed even greater extraction potential, but were compromised by higher melting points. For example, 1-butyl-6-methylquinolinium bis{(trifluoromethyl)sulfonyl}amide (mp 47 °C) extracted 90% of the available dibenzothiophene from dodecane at 60 °C.

Graphical abstract: Desulfurisation of oils using ionic liquids: selection of cationic and anionic components to enhance extraction efficiency

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Supplementary files

Article information


Submitted
11 Jul 2007
Accepted
24 Oct 2007
First published
14 Nov 2007

Green Chem., 2008,10, 87-92
Article type
Paper

Desulfurisation of oils using ionic liquids: selection of cationic and anionic components to enhance extraction efficiency

J. D. Holbrey, I. López-Martin, G. Rothenberg, K. R. Seddon, G. Silvero and X. Zheng, Green Chem., 2008, 10, 87
DOI: 10.1039/B710651C

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