Phase equilibria, structural and thermodynamic properties of phases in the nickel (II) methanesulfonate – Water, cobalt (II) methanesulfonate – Water and manganese (II) methanesulfonate – Water systems

Abstract

Solid-liquid equilibria in the Ni(CH3SO3)2-H2O, Co(CH3SO3)2-H2O, and Mn(CH3SO3)2-H2O systems were studied by isothermal solubility and DSC methods. TG and X-Ray diffraction were used to identify solid phases in equilibria with the solution. Water vapor pressure was determined by static method at 288.15 К, 298.15, and 308.15 K in the Ni(CH3SO3)2-H2O, Co(CH3SO3)2-H2O and Mn(CH3SO3)2-H2O systems. Based on vapor–liquid (VLE) and solid–liquid (SLE) equilibria data, parameters of the Pitzer-Simonson-Clegg model were obtained. Stability parameters of the hydrates Ni(CH3SO3)2·12H2O, Ni(CH3SO3)2·6H2O, Co(CH3SO3)2·4H2O, Co(CH3SO3)2·9H2O, Co(CH3SO3)2·6H2O, Mn(CH3SO3)2·12H2O, and Mn(CH3SO3)2·2H2O were estimated. Binary phase diagram fragments were calculated.