Experimental and modelling investigation of H2S solubility in N-methylimidazole and gamma-butyrolactone

Highlights: • Prediction of H₂S solubility by intelligent and thermodynamical method. • Accurate experimental H₂S solubility in low vapor pressure organic solvents. • N-methylimidazole (NMI) and gamma-butyrolactone (GBL) solvents has been utilized. • Comparison and evaluation of intelligent and thermodynamical modeling. -- Abstract: The solubility of hydrogen sulfide (H₂S) in N-methylimidazole (NMI) and gamma-butyrolactone (GBL) were experimentally measured. Gas concentrations were systematically measured by isochoric saturation method at temperatures from (303.15 to 353.15) K and pressure from vapour pressure of solvent up to about 1.2 MPa, in all experiments mole fraction of dissolved gas has been measured with uncertainty order of 10⁻³. In order to construct a GA-artificial neural network (ANN)-based model, the H₂S solubility, molality and total pressure were selected for the output. The precision of the GA is compared with experimental data and also with thermodynamic modelling approach in which Peng-Robinson-Stryjek-Vera (PRSV) cubic equation of state with Panagiotopoulos-Reid combining rule has been chosen for this purpose.