Complete phase diagrams and physico-chemical properties for the ternary system (CsCl + NaCl + H 2 O) were determined at T = (298.15, 308.15, and 318.15) K, respectively. The X-ray diffraction method and Schreinemaker's wet residue method were used to verify the solid phase. The phase diagrams show this ternary system is a complex type. Three crystallization regions were found corresponding to the single salt NaCl, a compound CsCl•2NaCl•2H 2 O, and a solid solution series [Cs 1−x (Na•H 2 O) x ]Cl (x in [Cs 1−x (Na•H 2 O) x ]Cl changed from 0 to 0.43 (298.15 K), 0.39 (308.15 K), and 0.36 (318.15 K) at each temperature. With rising temperature, the crystallization area of NaCl increased, but CsCl•2NaCl•2H 2 O and [Cs 1−x (Na•H 2 O) x ]Cl decreased simultaneously. However, density and refractive index increased with increasing CsCl concentration.

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The (solid + liquid) equilibrium (SLE) of N,N-diethylformamide (DEF) + MCl (M = Na, K, Rb) + H 2 O ternary systems were investigated from 288.15 to 338.15 K under atmospheric pressure. The isothermal solubility, density, and refraction index of the ternary solution, as well as the solubility at multiple temperature were reported. The (liquid + liquid) equilibrium (LLE) of (DEF + CsCl + H 2 O) ternary system was further studied at 298.15 and 308.15 K. The Jouyban− Arcee model was utilized to correlate the solubility, density, and refractive index data. The LLE was correlated by the Othmer−Tobias and the Bancroft equations. The complete phase diagrams of the (DEF + CsCl + H 2 O) system were further presented.