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Abstract <p>In this work, the isothermal solution equilibrium method was used to examine the phase equilibrium of a ternary LiCl–LiBr–CH<sub>3</sub>OH system at 273 and 323 K. The solubilities of LiCl and LiBr in CH<sub>3</sub>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<sub>3</sub>OH and LiCl–LiBr–H<sub>2</sub>O ternary systems were compared at different temperatures. The results showed that the phase diagram characteristics of the LiCl–LiBr–CH<sub>3</sub>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<sub>3</sub>OH ternary system increase, and the solubilities of LiCl and LiBr in methanol gradually increase.</p>

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

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • Xingbing Yang,
  • Tingting Zhang,
  • Jing Zhu,
  • Qian Wu,
  • Qin Zhang,
  • Jingyi Li,
  • Tingting Jiang,
  • Qin Xiao

摘要

Abstract

In this work, the isothermal solution equilibrium method was used to examine the phase equilibrium of a ternary LiCl–LiBr–CH3OH system at 273 and 323 K. The solubilities of LiCl and LiBr in CH3OH 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–CH3OH and LiCl–LiBr–H2O ternary systems were compared at different temperatures. The results showed that the phase diagram characteristics of the LiCl–LiBr–CH3OH 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–CH3OH ternary system increase, and the solubilities of LiCl and LiBr in methanol gradually increase.