Measurement of Solubility of CO2 in NaCl, CaCl2, MgCl2 and MgCl2 + CaCl2 Brines at Temperatures from 298 to 373 K and Pressures up to 20 MPa Using the Potentiometric Titration Method

Understanding the carbon dioxide (CO2) solubility in formation brines is of great importance to several industrial applications, including CO2 sequestration and some capture technologies, as well CO2-based enhanced hydrocarbon recovery methods. Despite years study, there are few literature data on for low salinity range. Thus, this distilled water aqueous ionic solutions NaCl, MgCl2, CaCl2 MgCl2 + were obtained a range (0–15,000 ppm) at temperatures from 298–373 K pressures up 20 MPa using an accurate unconventional method called potentiometric titration. An experimental set 553 points was collected method. The results experiments demonstrate that increasing pressure increases various brines, whereas temperature reduces solubility. role different ions changing elaborated through detailed discussion salting-out effect solutions. To verify research, by titration compared well-established analytical very good agreement with those obtained.