  The new predictive electrolyte model COSMO-RS-ES is evaluated and refined for
the calculation of solubilities of salts in mixed solvent systems. It is
demonstrated that the model is capable of predicting solid-liquid equilibria at
25 {\deg}C for ammonium and alkali metal salts quite accurately in a wide
variety of solvent mixtures. Furthermore, through the introduction of Gibbs
free energies of transfer of single ions it is shown that the model performance
can be improved even further. This new data type also allows for an
ion-specific way of evaluating the model for the first time. For some systems
when calculating the solubility, larger deviations are observed, but for the
vast majority of systems the model delivers good predictions. This shows that
COSMO-RS-ES is a valuable tool for calculation of phase equilibria in
electrolyte systems especially when the scarcity of data impede the application
of models that require a higher number of parameters.
