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

ABSTRACT

Solubility as well as solution density in aqueous systems (LiCl + MgCl2 + H2O) and (Li2SO4 + MgSO4 + H2O) at 288.15 K have been studied using the isothermal dissolution method. In the ternary system (LiCl + MgCl2 + H2O) at 288.15 K, two invariant points, three isothermal dissolution curves and three crystallization regions including MgCl2*6H2O, LiCl*2H2O, and double salt LiCl*MgCl2*7H2O were detected. Experimental results compared with values of this system at (273.15, 348.15, and 323.15) K shows that the LiCl*MgCl2*7H2O crystallization region is increased slightly with the increasing of temperature, while that of MgCl2*6H2O and LiCl*2H2O are decreased obviously. In the ternary system (Li2SO4 + MgSO4 + H2O) at 288.15 K, there are one invariant point, two isothermal dissolution curves, and two crystallization regions corresponding to Li2SO4*H2O and MgSO4*7H2O. When this experimental phase diagram at 288.15 K was compared with that at (298.15, 303.15, and 348.15) K, it shows that the Li2SO4*H2O crystallization region is increased with the increasing of temperature, while that of MgSO4*7H2O is decrease obviously. A Pitzer and Harvie Weare thermodynamic model were applied to calculate the solubility for this ternary system, and the calculated solubilities agree reasonably with the experimental results.