The solubility of hydrogen sulfide in 1-butanol, 2-butanol and tertiary butanol was inves- tigated at temperature from 313.15 to 353.15 K and pressures up to 2.3 MPa. The results show that the H 2S solubility in these three isomers at low pressure is comparable and at higher pressures, the H2S solubility increase reflects steric effects, which increase in the order tertiary butyl alcohol > secondary butyl alcohol > normal butyl alcohol. The results were modeled by Peng–Robinson–Stryjek–Vera (PRSV) equation of state and extended Henry’s law as well; thereby, the fugacity coefficients at operational conditions and Henry’s law constants of H 2S solubility associated with solution enthalpy and entropy at infinite dilution were obtained and the variation of solubility was interpreted in terms of the variation of thermodynamic properties (enthalpy and entropy). The results of the two models are in good agreement in comparison with experimental data with average rela- tive deviations of 2.5%, 2.86%, and 2.98% for 1-butanol, 2-butanol, and tertiary butanol, respectively, for PRSV EoS and 1.55%, 1.51%, and 2.41% for extended Henry’s law.

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