Solubility of gases in ionic liquids using PHTC equation of state

In our previous work, a perturbed hard trimer chain (PHTC) equation of state (EOS) was used to compute the volumetric properties of several ionic liquids (IL) (M. M. Alavianmehr et al., Ionics (2016) 2447–2459). In the present study, the proposed EOS is employed to model the solubilities of CO2, H2S and R143a gases in some ionic liquids for temperatures ranging from 282 K to 353.15 K and at pressures (gas mole fractions) up to 5 MPa (0.8). The proposed EOS is applied to estimate Henry's constant and Gibbs energy of solvation of CO2 in [C8mim][PF6] ionic liquid. The outcomes of the results for the Henry constant on the mole fraction scale are compared with the experimental data. Parameters appeared in the EOS for pure ILs and considered gases are obtained using densities given in literature over a broad range of temperature. Using three parameters together with one binary interaction parameter one can predict solubility parameters with acceptable accuracies.