Water Activity and Phase Equilibria Measurements and Model Simulation for the KCl–BaCl2–H2O System at 323.15 K and 0.1 MPa

Water activities for the ternary system of KCl−BaCl 2 −H 2 O and its sub-binary system BaCl 2 −H 2 O are elaborately measured using an isopiestic method at 323.15 K. The solubility isotherms for the KCl–BaCl 2 –H 2 O system are determined by isothermal equilibrium method. It is found that the measur...

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Bibliographic Details
Published in:Russian Journal of Physical Chemistry A 2023-07, Vol.97 (7), p.1459-1465
Main Authors: Han, Haijun, Ma, Junjie, Xie, Dongyue, Shi, Yaqin, Xing, Kongqiang, Shao, Dongxu, Zhong, Shengkui
Format: Article
Language:English
Subjects:
Barium chloride
Chemistry
Chemistry and Materials Science
Isotherms
Phase diagrams
Phase equilibria
Physical Chemistry
Physical Chemistry of Solutions
Solubility
Ternary systems
Thermodynamic properties
Water activity
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Summary:Water activities for the ternary system of KCl−BaCl 2 −H 2 O and its sub-binary system BaCl 2 −H 2 O are elaborately measured using an isopiestic method at 323.15 K. The solubility isotherms for the KCl–BaCl 2 –H 2 O system are determined by isothermal equilibrium method. It is found that the measured isopiestic composition lines for the KCl–BaCl 2 –H 2 O system slightly deviated from Zdanovskii rule, especially at lower water activity. Pitzer–Simonson–Clegg model is used to correlate the measured water activity and solubility data, and simulate the thermodynamic properties and predict the solubility of the ternary system. The reliability of the solubility data measured in this work is evaluated by comparing with the solubility isotherms calculated with Pitzer–Simonson–Clegg model. The measured water activity and solubility results are of great importance for predicting the phase diagram of other multi-component systems that related to this ternary system.
ISSN:0036-0244
1531-863X
DOI:10.1134/S0036024423070129