Measurement of Solubility of CO 2 in NaCl, CaCl 2, MgCl 2 and MgCl 2 + CaCl 2 Brines at Temperatures from 298 to 373 K and Pressures up to 20 MPa Using the Potentiometric Titration Method

Bo Liu, Barham Sabir Mahmood, Erfan Mohammadian, Abbas Khaksar Manshad, Nor Roslina Rosli and Mehdi Ostadhassan
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Bo Liu: Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Ministry of Education, Northeast Petroleum University, Daqing 163318, China
Barham Sabir Mahmood: Department of Petroleum, Faculty of Engineering, Koya University, Koya KOY45, Kurdistan Region—F.R., Iraq
Erfan Mohammadian: Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Ministry of Education, Northeast Petroleum University, Daqing 163318, China
Abbas Khaksar Manshad: Department of Petroleum Engineering, Abadan Faculty of Petroleum Engineering, Petroleum University of Technology (PUT), Abadan, Iran
Nor Roslina Rosli: School of Chemical Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam 40450, Selangor, Malaysia
Mehdi Ostadhassan: Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Ministry of Education, Northeast Petroleum University, Daqing 163318, China

Energies, 2021, vol. 14, issue 21, 1-14

Abstract: Understanding the carbon dioxide (CO 2 ) solubility in formation brines is of great importance to several industrial applications, including CO 2 sequestration and some CO 2 capture technologies, as well as CO 2 -based enhanced hydrocarbon recovery methods. Despite years of study, there are few literature data on CO 2 solubility for the low salinity range. Thus, in this study, the solubility of CO 2 in distilled water and aqueous ionic solutions of NaCl, MgCl 2 , CaCl 2 and MgCl 2 + CaCl 2 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 2 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.

Keywords: CO 2 solubility; CO 2 sequestration; ionic liquids; potentiometric titration; aqueous solutions (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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