Phase behavior of tetramethylurea + MCl (M = Na, K, Rb, Cs) + H2O systems at 288.2, 298.2 and 308.2 K

[Display omitted] •MCl + TMU + H2O systems (M = Na, K, Rb, Cs; TMU = tetramethylurea).•LLE systems of CsCl + TMU + H2O at 298.2 and 308.2 K.•SLE system of CsCl + TMU + H2O at 288.2 K.•SLE systems of NaCl/KCl/RbCl + TMU + H2O at 288.2, 298.2 and 308.2 K.•Affecting factors of temperature, solubility and solvent properties are discussed. For this article, we investigated the phase behavior and physicochemical properties of the ternary systems MCl (M = Na, K, Rb, Cs) + tetramethylurea (TMU) + H2O at temperatures of 288.2, 298.2 and 308.2 K. For (solid–liquid) equilibrium (SLE) systems (NaCl/KCl/RbCl + TMU + H2O at three temperatures and CsCl + TMU + H2O at 288.2 K), the density, solubility and refractive index about the saturated solutions was obtained. About (liquid–liquid) equilibrium (LLE) systems (CsCl + TMU + H2O at 298.2 and 308.2 K), the binodal curves and tie lines were obtained. The three parameter equation, Othmer-Tobias and Bancroft equations were used to correlate the SLE and LLE data.