Phase Equilibrium and Solvation Effect of the Ternary Mixture Solvent System (LiCl + CH3OH + H2O) at 298.15, 308.15 and 318.15 K

The solubility and physicochemical properties, including density and refractive index in the ternary mixture solvent system (LiCl + CH3OH + H2O) at 298.15, 308.15 and 318.15 K were determined using the isothermal equilibrium method. Based on the experimental data, the phase diagrams and physicochemical properties versus composition diagrams at different temperatures were plotted and compared. It was found that the isothermal phase diagram at each temperature consists of one invariant point (LiCl + LiCl·H2O), two univariant curves and two crystalline regions corresponding to LiCl·H2O and LiCl, respectively. The densities and refractive indices in the ternary mixture solvent system at each temperature change regularly with the increase of LiCl concentration. The calculated densities and refractive indices at the three temperatures agree well with the experimental results. The salting-out rate of LiCl solution increases gradually with the increase of CH3OH concentration at each temperature. The results obtained in this work can be used to produce anhydrous LiCl at relatively low temperatures, even room temperature.