Phase behaviour at different temperatures of an aqueous two-phase ionic liquid containing ([Bmim]BF4 + manganese sulfate + water)

► Experimental IL-ATPS data were acquired for the [Bmim]BF4 + MnSO4 + H2O system at 5 different temperatures. ► An phase inversion was observed between (288.15 and 303.15) K with decreasing system temperature. ► The influence of the cation on the process of phase segregation was assessed in terms of the free energy of hydration. ► The mathematical treatment of data was realized using Setschenow and Merchuk equations.