Carbon dioxide solubility in aqueous solutions of NaCl: Measurements and modeling with electrolyte equations of state

Abstract

A new high pressure cell was developed to measure the high pressure phase behavior of gas + aqueous salt solutions and validated through the measurement, and comparison against literature data, of two systems, the H2O+CO2 and H2O+CO2 + NaCl, at temperatures up to 363 K and pressures up to 13 MPa. As previously reported by others, a salting out effect on the carbon dioxide solubility in water by NaCl is observed, decreasing its solubility as the salt concentration increases. Electrolyte versions of the cubic plus association and the RKSA Infochem equations of state were used to estimate the H2O+CO2 and H2O+CO2 + NaCl phase behavior, with both EoS providing a good representation of the experimental data.