Abstract
The predictive Soave−Redlich−Kwong (PSRK) group contribution equation of state, which is commonly used for the prediction of phase equilibria with subcritical as well as supercritical compounds, was extended to electrolyte systems by linking it to the group contribution model LIFAC. The approach was at first evaluated by applying it for the calculation of vapor−liquid equilibrium (VLE) data of binary and ternary electrolyte systems (two solvents + one salt) using the published PSRK and LIFAC group interaction parameters. For the reliable description of gas solubility data, 16 new group interaction parameter sets (gas−ion interactions) were finally added to the current PSRK parameter matrix. For fitting the required interaction parameters, a large number of gas solubility data are required. These data have either been measured up to 10 MPa by means of a static synthetic method or taken from the literature. Typical results for the prediction of methane, carbon dioxide, and nitrogen solubility in aqueous ele...
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