Thermodynamic assessment of the KCl–K2CO3–NaCl–Na2CO3 system

Phase equilibria and thermodynamic properties of the KCl–K2CO3–NaCl–Na2CO3 system were analyzed on the basis of the thermodynamic evaluation of the KCl–NaCl,KCl–K2CO3,NaCl–Na2CO3,K2CO3–Na2CO3 and KCl–K2CO3–NaCl–Na2CO3 systems. The Gibbs energies of individual phases was approximated by two-sublattice models for ionic liquids and crystals. Most of the experimental information was well described by the present set of thermodynamic parameters. The lowest monovariant eutectic temperature in the KCl–NaCl–Na2CO3 system is located at 573 ∘C, with a composition of XNa2CO3=0.31,XKCl=0.35 and XNaCl=0.34.