Measurement of Solubility of CO<sub>2</sub> in NaCl, CaCl<sub>2</sub>, MgCl<sub>2</sub> and MgCl<sub>2</sub> + CaCl<sub>2</sub> Brines at Temperatures from 298 to 373 K and Pressures up to 20 MPa Using the Potentiometric Titration Method
Understanding the carbon dioxide (CO<sub>2</sub>) solubility in formation brines is of great importance to several industrial applications, including CO<sub>2</sub> sequestration and some CO<sub>2</sub> capture technologies, as well as CO<sub>2</sub>-b...
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| Auteurs principaux: | , , , , , |
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| Format: | article |
| Langue: | EN |
| Publié: |
MDPI AG
2021
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| Sujets: | |
| Accès en ligne: | https://doaj.org/article/3ad1a9f0819940e89f569eea727e597b |
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| Résumé: | Understanding the carbon dioxide (CO<sub>2</sub>) solubility in formation brines is of great importance to several industrial applications, including CO<sub>2</sub> sequestration and some CO<sub>2</sub> capture technologies, as well as CO<sub>2</sub>-based enhanced hydrocarbon recovery methods. Despite years of study, there are few literature data on CO<sub>2</sub> solubility for the low salinity range. Thus, in this study, the solubility of CO<sub>2</sub> in distilled water and aqueous ionic solutions of NaCl, MgCl<sub>2</sub>, CaCl<sub>2</sub> and MgCl<sub>2</sub> + CaCl<sub>2</sub> were obtained in a low salinity range (0–15,000 ppm) at temperatures from 298–373 K and pressures up to 20 MPa using an accurate and unconventional method called potentiometric titration. An experimental data set of 553 data points was collected using this method. The results of the experiments demonstrate that increasing pressure increases the solubility of CO<sub>2</sub> in various brines, whereas increasing temperature and salinity reduces the solubility. The role of different ions in changing the solubility is elaborated through a detailed discussion on the salting-out effect of different ionic solutions. To verify the experimental results of this research, the solubility points obtained by the potentiometric titration method were compared to some of the well-established experimental and analytical data from the literature and a very good agreement with those was obtained. |
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