Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

The solid-liquid equilibrium (SLE) of electrolyte mixtures Li+, K+, Rb+ // B4O72- - H2O at T = 323 K was studied by the isothermal dissolution method, the X-ray diffraction method was used to confirm the solid phase compositions. The analysis of phase diagram shows that the graph consists of 1 three-salt co-saturation invariant point, and 3 regions of crystallization corresponding to single salts Li2B4O7*3H2O, K2B4O7*4H2O, and RbB5O8*4H2O, respectively. The comparison of phase diagrams of system Li+, K+, Rb+ // B4O72- - H2O between 323 K and 348 K can be conclude that (1) the crystalline form of salts lithium borate, potassium borate, and rubidium borate did not change at 323 K and 348 K; (2) salt Li2B4O7*3H2O crystalline area decreases, other two salts K2B4O7*4H2O, and RbB5O8*4H2O of crystalline area increases at 323 K.