The physicochemical model of Kent and Eisenberg was used to regress simultaneously all the experimental results of the solubility of H2S in the four studied aqueous solutions of MIPA. The model correlates satisfactorily the experimental results. The standard deviation of the regression for pressure is 68.0 kPa using 69 experimental solubility points.
The new experimental solubility results of H2S were compared with those reported in the literature for aqueous solutions of diethanolamine (DEA), diisopropanolamine (DIPA), N-methyldiethanolamine (MDEA), and 2-amino-2-methyl-1-propanol (AMP), under similar conditions of temperature and amine concentration. From this comparison, it is concluded that aqueous solutions of MIPA are a good solvent alternative to use in industrial gas purification processes at relatively high pressures, since the magnitude of the H2S solubility results in MIPA solutions was found to be higher than that in aqueous solutions of MDEA, DEA, and DIPA.