Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

The solubilities in quaternary system NaCl-KCl-SrCl2-H2O and its subsystem KCl-SrCl2-H2O at 288.15 K were investigated with the isothermal dissolution method. The phase diagram of the ternary system is composed of two single-salt crystallization for KCl and SrCl2*6H2O, two solubility univariant curves and one cosaturated point. The dry-salt diagram of the quaternary system consists of three single-salt crystallization fields for NaCl, KCl and SrCl2*6H2O, three solubility univariant curves and one invariant point. Combining the determined solubilities and Pitzer binary parameters obtained in the literature, the lacking Pitzer mixing parameters Na,Sr, K,Sr, Na,Sr,Cl, K,Sr,Cl and solubility product constants of solid salts for the systems were fitted on the basis of Pitzer model. The model was then used for calculating the solubilties of the two systems. The theoretical calculated results by model coincide with the experimental values.