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

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