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

ABSTRACT

The solubilities and physicochemical properties, including density, refractive index, and pH, of the ternary system (LiCl + Li2SO4 + H2O) at T = (288.15 and 308.15) K and p = 0.1 MPa were determined with the isothermal dissolution equilibrium method. The phase diagram in the ternary system at 288.15 K consists of one invariant point, two univariant solubility curves, and two crystallization regions corresponding to Li2SO4*H2O and LiCl*H2O. A similar structure can be found in this system at 308.15 K. This ternary system belongs to hydrate type I at two temperatures, and neither double salts nor solid solutions were formed at the investigated temperatures. The crystallized area of LiCl*H2O decreases with increasing temperature, while that of Li2SO4*H2O increases obviously. The solution density, refractive index, and pH value of the ternary system (LiCl + Li2SO4 + H2O) at the two temperatures change regularly with the mass fraction of lithium. The Pitzer Harvie Weare thermodynamic model of aqueous electrolyte solutions was chosen to simulate the solubility of (LiCl + Li2SO4 + H2O) at (288.15 and 308.15) K. Reasonable agreement between the predicted solubilities and experimental data was found.