Hu J.-X.,Chengdu University of Technology |
Hu J.-X.,Chemistry for the Universities in Sichuan Province |
Sang S.-H.,Chengdu University of Technology |
Sang S.-H.,Chemistry for the Universities in Sichuan Province |
And 8 more authors.
Journal of Chemical and Engineering Data | Year: 2015
The solid-liquid equilibria in the ternary system CaBr2-MgBr2-H2O and quaternary system NaBr-KBr-SrBr2-H2O at 348 K were determined with the method of isothermal solution saturation. Also determined are the densities of saturated solutions. The phase diagram of the ternary system CaBr2-MgBr2-H2O has two invariant points, three univariant curves and three crystallization fields (which are saturated with MgBr2·6H2O, 2CaBr2·MgBr2·12H2O, and CaBr2·2H2O, respectively). The phase diagram of the quaternary system NaBr-KBr-SrBr2-H2O includes one invariant point, three univariant curves and three crystallization fields (which are saturated with SrBr2·6H2O, NaBr, and KBr, respectively). On the basis of the extended Harvie-Weare (HW) model and its temperature-dependent equation, the mixing ion interaction parameters θMg,Ca, ψMg,Ca,Br and the dissolution equilibrium constant K for MgBr2·6H2O, CaBr2·2H2O, and 2CaBr2·MgBr2·12H2O in the ternary system at 348 K were fitted by using the Pitzer equations and the multiple linear regression method. A chemical model was constructed to calculate the solubility curves by using the Pitzer equations in the ternary systems MgBr2-CaBr2-H2O at 348 K. The calculated solubilities are in agreement with experimental data. © 2015 American Chemical Society.