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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 54, Number 3
JKCSEZ 54(3)
June 20, 2010 

Measurement of Solubilities in the Ternary System
NaCl + CaCl2 + H2O and KCl + CaCl2 + H2O at 50 oC

NaCl + CaCl2 + H2O 및 KCl + CaCl2 + H2O 삼성분계에 대한
50 oC에서의 용해도 측정
Ji min Yang*, Guang yue Hou, Tian rong Ding, Peng Kou

Ji min Yang*, Guang yue Hou, Tian rong Ding, Peng Kou
Pitzer 모델, 용해도 평형상수, 용해도 예측 , Pitzer model, Solubility equilibrium constant, Solubility prediction

The solubility and the physicochemical property (refractive index) in the NaCl-CaCl2-H2O and KCl-CaCl2-H2O systems were determined at 50 oC and the phase diagrams and the diagrams of physicochemical property vs composition were plotted. One invariant point, two univariant curves, and two crystallization zones, corresponding to sodium Chloride (or potassium chloride), dihydrate (CaCl2·2H2O) showed up in the phase diagrams of the ternary systems. The mixing parameters θM,Ca and ΨM,Ca,Cl (M = Na or K) and equilibrium constant Ksp were evaluated in NaCl-CaCl2-H2O and KCl-CaCl2-H2O systems by least-squares optimization procedure, in which the single-salt Pitzer parameters of NaCl, KCl and CaCl2 β(0), β(1), β(2) and Cф were directly calculated from the literature. The results obtained were in good agreement with the experimental data.

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