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

• Solid-liquid equilibria in the Ni(CH 3 SO 3) 2 -H 2 O, Co(CH 3 SO 3) 2 -H 2 O, and Mn(CH 3 SO 3) 2 -H 2 O systems were studied. • Water vapor pressure was determined in the Ni(CH 3 SO 3) 2 -H 2 O, Co(CH 3 SO 3) 2 -H 2 O, and Mn(CH 3 SO 3) 2 -H 2 O systems. • Parameters of the Pitzer-Simonson-Clegg model were obtained in the Ni(CH 3 SO 3) 2 -H 2 O, Co(CH 3 SO 3) 2 -H 2 O, and Mn(CH 3 SO 3) 2 -H 2 O systems. • Several new hydrates in the Ni(CH 3 SO 3) 2 -H 2 O, Co(CH 3 SO 3) 2 -H 2 O, and Mn(CH 3 SO 3) 2 -H 2 O systems were revealed. • Stability parameters and crystal structures of the hydrates (Ni(CH 3 SO 3) 2 ·12H 2 O, Ni(CH 3 SO 3) 2 ·6H 2 O, Co(CH 3 SO 3) 2 ·4H 2 O, Co(CH 3 SO 3) 2 ·9H 2 O, Co(CH 3 SO 3) 2 ·6H 2 O, Mn(CH 3 SO 3) 2 ·12H 2 O, and Mn(CH 3 SO 3) 2 ·2H 2 O) were calculated. • Binary phase diagram fragments were calculated in the Ni(CH 3 SO 3) 2 -H 2 O, Co(CH 3 SO 3) 2 -H 2 O, and Mn(CH 3 SO 3) 2 -H 2 O systems. Solid-liquid equilibria in the Ni(CH 3 SO 3) 2 -H 2 O, Co(CH 3 SO 3) 2 -H 2 O, and Mn(CH 3 SO 3) 2 -H 2 O 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(CH 3 SO 3) 2 -H 2 O, Co(CH 3 SO 3) 2 -H 2 O and Mn(CH 3 SO 3) 2 -H 2 O 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(CH 3 SO 3) 2 ·12H 2 O, Ni(CH 3 SO 3) 2 ·6H 2 O, Co(CH 3 SO 3) 2 ·4H 2 O, Co(CH 3 SO 3) 2 ·9H 2 O, Co(CH 3 SO 3) 2 ·6H 2 O, Mn(CH 3 SO 3) 2 ·12H 2 O, and Mn(CH 3 SO 3) 2 ·2H 2 O were estimated. Binary phase diagram fragments were calculated. [ABSTRACT FROM AUTHOR]