A Thermodynamic Model for the Solubility of SO<sub>2</sub> in Multi-Ion Electrolyte Solutions and Its Applications
A solubility model of SO<sub>2</sub> in multi-ion electrolyte solutions has been developed by the activity-fugacity relation at vapor-liquid equilibria. The fugacity coefficient of SO<sub>2</sub> in the vapor phase is calculated by the equation of state (EOS) of pure SO<su...
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2025-04-01
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| author | Baoyi Feng Zequn Zhang Mei Xu Shide Mao |
| author_facet | Baoyi Feng Zequn Zhang Mei Xu Shide Mao |
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| description | A solubility model of SO<sub>2</sub> in multi-ion electrolyte solutions has been developed by the activity-fugacity relation at vapor-liquid equilibria. The fugacity coefficient of SO<sub>2</sub> in the vapor phase is calculated by the equation of state (EOS) of pure SO<sub>2</sub>, and the activity coefficient of SO<sub>2</sub> in the liquid phase is calculated by the Pitzer activity coefficient theory. The model can reproduce the reliable solubility data of SO<sub>2</sub> in pure water and multi-ion electrolyte solutions (Na<sup>+</sup>, K<sup>+</sup>, Cl<sup>−</sup>, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msubsup><mrow><mi>SO</mi></mrow><mn>4</mn><mrow><mn>2</mn><mo>−</mo></mrow></msubsup></mrow></semantics></math></inline-formula>) within or close to experimental uncertainties. Although the second-order and third-order interaction parameters between SO<sub>2</sub> and Mg<sup>2+</sup> and Ca<sup>2+</sup> have been adopted by an approximation, the solubility model can also be extended to predict the SO<sub>2</sub> solubility in seawater. In addition, combining with the EOS of a CO<sub>2</sub>-SO<sub>2</sub> fluid mixture, the model can be used to predict the solubility of a CO<sub>2</sub>-SO<sub>2</sub> mixture in aqueous electrolyte solutions. The calculated results are consistent with experimental data, which indicates that the solubility model has certain predictive ability. |
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| spelling | doaj-art-2cebe52d2e3b43df8bc36a42f0a5f6452025-08-20T02:17:00ZengMDPI AGApplied Sciences2076-34172025-04-01157392710.3390/app15073927A Thermodynamic Model for the Solubility of SO<sub>2</sub> in Multi-Ion Electrolyte Solutions and Its ApplicationsBaoyi Feng0Zequn Zhang1Mei Xu2Shide Mao3School of Earth Sciences and Resources, China University of Geoscience, Beijing 100083, ChinaSchool of Earth Sciences and Resources, China University of Geoscience, Beijing 100083, ChinaSchool of Earth Sciences and Resources, China University of Geoscience, Beijing 100083, ChinaSchool of Earth Sciences and Resources, China University of Geoscience, Beijing 100083, ChinaA solubility model of SO<sub>2</sub> in multi-ion electrolyte solutions has been developed by the activity-fugacity relation at vapor-liquid equilibria. The fugacity coefficient of SO<sub>2</sub> in the vapor phase is calculated by the equation of state (EOS) of pure SO<sub>2</sub>, and the activity coefficient of SO<sub>2</sub> in the liquid phase is calculated by the Pitzer activity coefficient theory. The model can reproduce the reliable solubility data of SO<sub>2</sub> in pure water and multi-ion electrolyte solutions (Na<sup>+</sup>, K<sup>+</sup>, Cl<sup>−</sup>, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msubsup><mrow><mi>SO</mi></mrow><mn>4</mn><mrow><mn>2</mn><mo>−</mo></mrow></msubsup></mrow></semantics></math></inline-formula>) within or close to experimental uncertainties. Although the second-order and third-order interaction parameters between SO<sub>2</sub> and Mg<sup>2+</sup> and Ca<sup>2+</sup> have been adopted by an approximation, the solubility model can also be extended to predict the SO<sub>2</sub> solubility in seawater. In addition, combining with the EOS of a CO<sub>2</sub>-SO<sub>2</sub> fluid mixture, the model can be used to predict the solubility of a CO<sub>2</sub>-SO<sub>2</sub> mixture in aqueous electrolyte solutions. The calculated results are consistent with experimental data, which indicates that the solubility model has certain predictive ability.https://www.mdpi.com/2076-3417/15/7/3927SO<sub>2</sub>solubility modelelectrolyte solutionsequation of state |
| spellingShingle | Baoyi Feng Zequn Zhang Mei Xu Shide Mao A Thermodynamic Model for the Solubility of SO<sub>2</sub> in Multi-Ion Electrolyte Solutions and Its Applications Applied Sciences SO<sub>2</sub> solubility model electrolyte solutions equation of state |
| title | A Thermodynamic Model for the Solubility of SO<sub>2</sub> in Multi-Ion Electrolyte Solutions and Its Applications |
| title_full | A Thermodynamic Model for the Solubility of SO<sub>2</sub> in Multi-Ion Electrolyte Solutions and Its Applications |
| title_fullStr | A Thermodynamic Model for the Solubility of SO<sub>2</sub> in Multi-Ion Electrolyte Solutions and Its Applications |
| title_full_unstemmed | A Thermodynamic Model for the Solubility of SO<sub>2</sub> in Multi-Ion Electrolyte Solutions and Its Applications |
| title_short | A Thermodynamic Model for the Solubility of SO<sub>2</sub> in Multi-Ion Electrolyte Solutions and Its Applications |
| title_sort | thermodynamic model for the solubility of so sub 2 sub in multi ion electrolyte solutions and its applications |
| topic | SO<sub>2</sub> solubility model electrolyte solutions equation of state |
| url | https://www.mdpi.com/2076-3417/15/7/3927 |
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