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− Solubility data of hydrogen sulfide (H 2 S) and methane (CH 4 ) in two kinds of ionic liquids with the same anion: 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([emim][TfO]) and 1-butyl-1-methylpyrrolidinium trifluoromethanesulfonate ([bmpyr][TfO]) are presented at pressures up to about 30 MPa and at temperatures between 303 K and 343 K. The gas solubilities in ionic liquids were determined by measuring the bubble point pressures of the gas + ionic liquid mixtures with various compositions at different temperatures using a high-pressure equilibrium apparatus equipped with a variable-volume view cell. The H 2 S solubilities in ionic liquid increased with the increase of pressure and decreased with the increase of temperature. On the other hand, the CH 4 solubilities in ionic liquid increased significantly with the increase of pressure, but there was little effect of temperature on the CH 4 solubility. For the ionic liquds [emim][TfO] and [bmpyr][TfO] with the same anion, the solubility of H 2 S as a molality basis was substantially similar, regardless of the temperature and pressure conditions as a molar concentration basis. Comparing the solubilities of H 2 S and CH 4 in the ionic liquid [emim][TfO], the solubilities of H 2 S were much greater than those of CH 4 . For the same type of ionic liquid, the solubility data of H 2 S and CH 4 obtained in this study were compared to the solubility data of CO 2 from the literature. When compared at the same pressure and temperature conditions, the CO 2 solubility was in between the solubility of H 2 S and CH 4 .

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Solubility of Hydrogen Sulfide and Methane in Ionic Liquids: 1-Ethy-3-methylimidazolium Trifluoromethanesulfonate and 1-Butyl-1-methylpyrrolidinium Trifluoromethanesulfonate