Thermodynamics and Phase Equilibrium of the System CsCl–MgCl₂–H₂O at 298.15 K

Abstract

Water activities of the CsCl–MgCl2–H2O ternary system and its sub-binary systems were elaborately measured by an isopiestic method at 298.15 K. The solubility of this ternary system at 298.15 K was also measured by two different methods, namely isothermal method and Flow-Cloud-Point method. The solubilities measured by the two different methods were consistent with each other. A Pitzer model was used to represent the thermodynamic properties and calculate the solubility isotherms for the CsCl–MgCl2–H2O ternary system at 298.15 K. Both the equal water activity lines and the solubility isotherms are calculated with parameters reported in literature. It was found that only the calculated equal water activity lines with the parameters reported by Scharge et al. are consistent with the experimental values of this work. However, all the calculated solubility isotherms deviated from the experimental data in this work. New set of ternary parameters were obtained by fitting the water activities and solubility data of this work. Using the new parameters, the calculated equal water activity lines and solubility isotherms agreed with experimental values measured in this work.

Water Activity and Solubility Measurements and Model Simulation of the CsCl–MgCl2–H2O Ternary System at 323.15 K

“…We have studied the thermodynamic properties and solubility of the CsCl−MgCl 2 −H 2 O ternary system at 298.15 K in our previous work. 1 As a continuous work, this paper focuses on the thermodynamic properties and solubility of this ternary system at 323.15 K. The water activities for the MgCl 2 −H 2 O system at 323.15 K have been reported in the literature. 2,3 Up to now, there has been no report on the water activity and solubility for the CsCl−MgCl 2 −H 2 O ternary system at 323.15 K, nor on their thermodynamic model simulation.…”

“…The solubility and thermodynamic properties of the cesium salt related to the ternary system CsCl–MgCl 2 –H 2 O at different temperatures, and their simulation by the thermodynamic model, are of great importance for extracting cesium resources from the salt lake. We have studied the thermodynamic properties and solubility of the CsCl–MgCl 2 –H 2 O ternary system at 298.15 K in our previous work . As a continuous work, this paper focuses on the thermodynamic properties and solubility of this ternary system at 323.15 K. The water activities for the MgCl 2 –H 2 O system at 323.15 K have been reported in the literature. , Up to now, there has been no report on the water activity and solubility for the CsCl–MgCl 2 –H 2 O ternary system at 323.15 K, nor on their thermodynamic model simulation.…”

Thermodynamic Description of Dilution and Dissolution Processes in the MgCl2−CsCl−H2O Ternary System

“…The second step in the data analysis was to obtain the appropriate water activities for concentrations under study. From the literature data [ 13 ], the water activities for the solutions with were acquired. After that, they were recalculated to water activities for the concentrations under study.…”

“…The thermodynamical properties of the MgCl 2 −CsCl−H 2 O system were studied by different methods. The earlier studies are related to the solid MgCl 2 • CsCl • 6 H 2 O structure [7][8][9][10], whereas the more recent papers are focusing on the liquid phase of this ternary system [11][12][13]. However, no data describing enthalpies, which are needed for the complete thermodynamic description of this system, were found in the literature.…”

Stable Phase Equilibrium of the Quaternary System Li2SO4 + Cs2SO4 + MgSO4 + H2O at 298.2 K

“…Hitherto, a series of aqueous solution systems concerning the element lithium or cesium have been investigated, such as the ternary system Li 2 SO 4 + MgSO 4 + H 2 O at 323.15 and 373.15 K; Cs 2 SO 4 + Li 2 SO 4 + H 2 O at 298 K , and 308 K; NaCl + CsCl + H 2 O at 298.15, 308.15, and 318.15 K; Rb + (Cs + ), Mg 2+ //SO 4 2– + H 2 O at 298.2 K; CsCl 2 + MgCl 2 + H 2 O at 298.15 K; CsCl + KCl + H 2 O and CsBr + KBr + H 2 O at 298.2 K; Na + , Rb + (Cs + )//SO 4 2– + H 2 O at 298.2 K; Cs 2 CO 3 + Rb 2 CO 3 + H 2 O 2 + H 2 O; the quaternary systems Cs 2 SO 4 + CsCl + Rb 2 SO 4 + RbCl + H 2 O and Cs 2 SO 4 + CsCl + K 2 SO 4 + KCl + H 2 O at 298.2 K; Li + , Na + , Cs + //SO 4 2– + H 2 O at 298.2 K; KCl + RbCl + CsCl + H 2 O at 298.15 K; , Li + , K + , Mg 2+ //SO 4 2– + H 2 O at 273.15 K; LiCl + Li 2 SO 4 + Li 2 B 4 O 7 + H 2 O at 273 K; and LiCl + MgCl 2 + Li 2 SO 4 + MgSO 4 + H 2 O at 323.15 K …”