Isopiestic measurement and solubility evaluation of the ternary system (CaCl2 + SrCl2 + H2O) at T = 298.15 K |
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| Institution: | 1. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, PR China;2. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, PR China;1. Laboratoire Énergie Solaire et Économie d''Énergie (LESEE), Département Génie Électrique, Énergétique et Industriel, Institut International d''Ingénierie de l''Eau et de l''Environnement (2iE), 01 BP 594 Ouagadougou 01, Burkina Faso;2. CNR – Istituto di Tecnologie Avanzate per l''Energia “Nicola Giordano”, Via Salita S. Lucia sopra Contesse 5, 98126 Santa Lucia, Messina, Italy;3. Innovation Incubator “Competence Tandem Thermal Battery”, Leuphana University Lüneburg, Scharnhorststraße 1, 21335 Lüneburg, Germany;4. PROMES-CNRS, Université de Perpignan Via Domitia, Tecnosud, Rambla de la Thermodynamique, 66100 Perpignan, France;1. Université Lyon 1, CNRS, UMR 5256, IRCELYON, Institut de Recherches sur la Catalyse et l’Environnement de Lyon, 2 Avenue Albert Einstein, F-69626 Villeurbanne, France;1. Department of Thermodynamics and Mathematical Physics, Université de Mons, 31 Boulevard Dolez, B-7000 Mons, Belgium;2. 4MAT Department, Université libre de Bruxelles (ULB), 50 Avenue F.D. Roosevelt – CP 194/3, B-1050 Bruxelles, Belgium;3. Institut Lavoisier, Université de Versailles-Saint-Quentin-en-Yvelines, Université Paris Saclay, 45 Avenue des Etats-Unis, 78035 Versailles Cedex, France;1. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;2. School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China |
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| Abstract: | Water activities in the ternary system (CaCl2 + SrCl2 + H2O) and its sub-binary system (CaCl2 + H2O) at T = 298.15 K have been elaborately measured by an isopiestic method. The data of the measured water activity were used to justify the reliability of solubility isotherms reported in the literature by correlating them with a thermodynamic Pitzer–Simonson–Clegg (PSC) model. The model parameters for representing the thermodynamic properties of the (CaCl2 + H2O) system from (0 to 11) mol ⋅ kg−1 at T = 298.15 K were determined, and the experimental water activity data in the ternary system were compared with those predicted by the parameters determined in the binary systems. Their agreement indicates that the PSC model parameters can reliably represent the properties of the ternary system. Under the assumption that the equilibrium solid phases are the pure solid phases (SrCl2 ⋅ 6H2O and CaCl2 ⋅ 6H2O)(s) or the ideal solid solution consisting of CaCl2 ⋅ 6H2O(s) and SrCl2 ⋅ 6H2O(s), the solubility isotherms were predicted and compared with experimental data from the literature. It was found that the predicted solubility isotherm agrees with experimental data over the entire concentration range at T = 298.15 K under the second assumption described above; however, it does not under the first assumption. The modeling results reveal that the solid phase in equilibrium with the aqueous solution in the ternary system is an ideal solid solution consisting of SrCl2 ⋅ 6H2O(s) and CaCl2 ⋅ 6H2O(s). Based on the theoretical calculation, the possibility of the co-saturated points between SrCl2 ⋅ 6H2O(s) and the solid solution (CaCl2 ⋅ 6H2O + SrCl2 ⋅ 6H2O)(s) and between CaCl2 ⋅ 6H2O(s) and the solid solution (CaCl2 ⋅ 6H2O + SrCl2 ⋅ 6H2O)(s), which were reported by experimental researchers, has been discussed, and the Lippann diagram of this system has been presented. |
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| Keywords: | Water activity Solubility Calcium chloride Strontium chloride Thermodynamic model Solid solution |
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