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.