Solubility of Hydrogen Sulfide in [bmim][PF6]

New experimental data are preseInted for the solubility of hydrogen sulfide in the ionic liquid 1-N-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]) at five temperatures in the range (298–403) K at pressures up to 9.6MPa. The ionic liquid [bmim][PF6] is a good solvent for hydrogen sulfide. At 9MPa the mole fraction H2S in the liquid is about 0.7. The solubility is a strong function of temperature; at 2MPa the solubility (mole fraction H2S) decreases from about 0.84 at 298K to about 0.2 at 403 K. The Krichevsky–Kasarnovsky equation was used to correlate the experimental data, and Henry’s constants were obtained. The solution thermodynamic properties at standard temperature and pressure were calculated.