HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

An improved model for CO2 solubility in aqueous Na+–Cl−–SO42− systems up to 473.15 K and 40 MPa

Abstract : This article contributes to the development of a thermodynamic model for simulating CO2 solubility in pure water and aqueous brines under different conditions of temperature, pressure and ionic strength. The modeling activity-fugacity (γ-φ) approach allows calculating CO2 solubility, based on the Pitzer electrolyte theory for activity coefficient and Peng-Robinson's equation of state for fugacity. The present work proposes a new set of Pitzer interaction parameters through the set of CO2 solubility data in saline systems such as CO2-H2O-NaCl and CO2-H2O-Na2SO4. The determined model is capable of covering a wide T − P − I range (273.15–473.15 K, 0.1–40 MPa and 0–6 mol/kg). Average absolute deviation of CO2 solubility is about 5% compared to a large number of experimental data available (more than 700 data analyzed). New experimental solubility data for the CO2-H2O-NaCl-Na2SO4 system were also acquired in this study (303.15–423.15 K, 1.5–20 MPa and 0–6 mol/kg) to test the model's capacity: it is able to describe the CO2 solubility in aqueous salt mixtures without any further optimizations of interaction parameters.
Document type :
Journal articles
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03315806
Contributor : Nathalie Pothier Connect in order to contact the contributor
Submitted on : Friday, August 6, 2021 - 7:36:51 AM
Last modification on : Tuesday, May 10, 2022 - 3:25:01 PM
Long-term archiving on: : Sunday, November 7, 2021 - 6:21:40 PM

File

1-s2.0-S0009254121003867-main....
Files produced by the author(s)

Identifiers

Collections

Citation

Pedro dos Santos, Laurent André, Marion Ducousso, Arnault Lassin, François Contamine, et al.. An improved model for CO2 solubility in aqueous Na+–Cl−–SO42− systems up to 473.15 K and 40 MPa. Chemical Geology, Elsevier, 2021, 582, pp.120443. ⟨10.1016/j.chemgeo.2021.120443⟩. ⟨insu-03315806⟩

Share

Metrics

Record views

98

Files downloads

42