Phase Equilibrium of the LiCl–LiBr–CH3OH Ternary at 273 and 323 K

In this work, the isothermal solution equilibrium method was used to examine the phase equilibrium of a ternary LiCl–LiBr–CH 3 OH system at 273 and 323 K. The solubilities of LiCl and LiBr in CH 3 OH at different temperatures were measured by chemical analysis. The chemical composition of the equilibrium solid phase was determined via the wet slag method combined with X-ray diffraction. Thus, the corresponding phase diagram was created, and the LiCl–LiBr–CH 3 OH and LiCl–LiBr–H 2 O ternary systems were compared at different temperatures. The results showed that the phase diagram characteristics of the LiCl–LiBr–CH 3 OH ternary system at 273 and 323 K were similar, with a saturation point, two univariable solubility curves and two solid phase crystallization zones; these zones represented the Li(Cl,Br) solid solution crystallization zone and LiCl single salt crystallization zone. The single salt of LiCl can be separated using crystallization filtration. LiBr has a salt-out effect on LiCl, but LiBr cannot be obtained. With increasing temperature, the contents of LiCl and LiBr at the saturation point of the LiCl–LiBr–CH 3 OH ternary system increase, and the solubilities of LiCl and LiBr in methanol gradually increase.