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Issue 7, 2004
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Deep desulfurization of oil refinery streams by extraction with ionic liquids

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Abstract

Extraction of S- and N-compounds from gasoline and diesel oil by ionic liquids (ILs) indicates that such a process could be an alternative to common hydrodesulfurization (HDS) for deep desulfurization down to values of 10 ppm S or even lower. The results show the selective extraction properties of ILs, especially with regard to those S-compounds which are hard to remove by HDS, e.g. dibenzothiophene derivatives present in middle distillates like diesel oil. The application of mild process conditions (ambient pressure and temperature) and the fact that no hydrogen is needed, are additional advantages compared to HDS. Very promising ILs are [BMIM][OcSO4] and [EMIM][EtSO4], as they are halogen-free and available from relatively cheap starting materials. Extraction with ILs is not limited to diesel oil, but probably even more attractive for FCC-gasoline. Although HDS of S-species present in this gasoline constituent – mainly thiophenes – is relatively straightforward, a major drawback is the loss in octane number by olefin saturation, which favours extraction with ILs.

Graphical abstract: Deep desulfurization of oil refinery streams by extraction with ionic liquids

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Publication details

The article was received on 10 May 2004, accepted on 08 Jun 2004 and first published on 28 Jun 2004


Article type: Paper
DOI: 10.1039/B407028C
Citation: Green Chem., 2004,6, 316-322
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    Deep desulfurization of oil refinery streams by extraction with ionic liquids

    J. Eßer, P. Wasserscheid and A. Jess, Green Chem., 2004, 6, 316
    DOI: 10.1039/B407028C

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