Deep desulfurization of oil refinery streams by extraction with ionic liquids精品.pdfVIP

Deep desulfurization of oil refinery streams by extraction with ionic liquids Jochen Eßer,a Peter Wasserscheidb and Andreas Jess*a a Department of Chemical Engineering, University Bayreuth, Universitätsstr. 30, D-95440 Bayreuth, Germany. E-mail: jess@uni-bayreuth.de b Department of Chemical Reaction Engineering, University Erlangen/Nuremberg, Egerlandstr. 1, D-91058 Erlangen, Germany Received 10th May 2004, Accepted 8th June 2004 First published as an Advance Article on the web 28th June 2004 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][OcSO ] and [EMIM][EtSO ], as they are 4 4 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. Introduction H2S, which is separated from the desulfurized oil, is subseque