Influence of the interaction between hydrogen sulfide and ionic liquids on solubility: experimental and theoretical investigation |
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Authors: | Pomelli Christian Silvio Chiappe Cinzia Vidis Ana Laurenczy Gabor Dyson Paul J |
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Institution: | Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Swizerland. christian.pomelli@gmail.com |
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Abstract: | The solubility of H(2)S in a series of 1-butyl-3-methylimidazolium (bmim](+)) based ionic liquids (ILs) with different anions, chloride, tetrafluoroborate (BF(4)](-)), hexafluorophosphate (PF(6)](-)), triflate (TfO](-)), and bis(trifluoromethyl)sulfonylimide (Tf(2)N]-), and in a series of Tf(2)N] ILs with different cations, i.e., N-alkyl-N'-methylimidazolium, 2-methyl-N-methyl-N'-alkyimidazolium, N-alkylpyridinium, N-butyl-N-methylpyrrolidinium, and N-alkyl-N,N-dimethyl-N-(2-hydroxyethyl)ammonium has been determined using medium-pressure NMR spectroscopy. The observed solubilities are significantly higher than those reported for many other gases in ILs, suggesting the occurrence of specific interactions between H2S and the examined ILs. Quantum chemical calculations have been used to investigate at a molecular level the interaction between H2S and the bmim](+)-based ILs. |
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