Phase Diagram of Quaternary System NaBr–KBr–CaBr2–H2O at 323 K

Abstract

The phase equilibria in the system NaBr–KBr–CaBr₂–H₂O at 323 K were studied using the isothermal dissolution equilibrium method. Using the experimental solubilities of salts data, phase diagram was constructed. The phase diagram have two invariant points, five univariant curves, and four crystallization fields. The equilibrium solid phases in the system are NaBr, NaBr · 2H₂O, KBr, and CaBr₂ · 4H₂O. The solubilities of salts in the system at 323 K were calculated by Pitzer’s equation. There is shown that the calculated solubilities agree well with experimental data.