Solubility of Hydrogen Sulfide in N-Methylacetamide and N,N-Dimethylacetamide: Experimental Measurement and Modeling

Abstract

The solubility of hydrogen sulfide in N-methylacetamide and N,N-dimethylacetamide were experimentally measured. Gas concentrations were systematically measured by the isochoric saturation method at temperatures from (303.15 to 363.15) K and pressures from the vapor pressure of solvent up to about 2.2 MPa. Results show that H2S solubility in N,N-dimethylacetamide is more than that in N-methylacetamide. The experimental data were correlated using (1) the Krichevsky–Ilinskaya equation and (2) a generic Redlich–Kwong (RK) cubic equation of state. Using the solubility data, the partial molar thermodynamic properties of solution such as Gibbs free energy, enthalpy, and entropy at infinitely diluted solution, and also the enthalpies of absorption of loaded solutions were calculated using the Gibbs–Helmholtz equation.