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Experimental-determination and thermodynamic analysis of the phase-diagrams of the systems NaCl-Na2SO4 and NaCl -NaF

J. Gabčová and M. Malinovský

Department of Chemical Technology of Inorganic Substances, Slovak Technical University, CS-812 37 Bratislava


Abstract: Phase diagrams of the systems NaCI—Na2SO4 and NaCI—NaF were experi­mentally investigated using the thermal analytical method. It was found that both systems probably have a simple eutectic character. However, in the case of the system NaCI—NaF existence of a narrow range of solid solutions formed on the base of NaCI cannot be excluded."Coordinates of the eutectic point in the system NaCI—Na2SO4 are following: 54.0 mole % NaCI, 46.0 mole % Na2SO4 ; T(E) = 901 K. Coordinates of the eutectic point in the system NaCI—NaF are: 66.0 mole % NaCI, 34.0 mole % NaF; T(E) = 955 K. Experimental data were treated by thermodynamic analysis. The 1st and the 2nd criterion of thermodynamic consistency were applied. The activity coef­ficients, the parameter b in the universal relationship, the parameter w in the relationship valid for true regular solutions and the excess Gibbs energies of components were determined.

Full paper in Portable Document Format: 402a201.pdf


Chemical Papers 40 (2) 201–213 (1986)

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