| The knowledge of solubility behavior of carbon dioxide and sulfur dioxide mixtures in brines at elevated pressures and temperatures is important both in the viability investigations of geologic co-sequestrations into deep saline aquifers and in the simulations for flue gas sequestration. We present a model describing carbon dioxide and sulfur dioxide as species that do not self-associate but cross associate with water. The eCPA equation of state is applied to work with the model at conditions relevant to geologic sequestration of flue gases, i.e., up to 393 K and 450 bars (equivalent to a depth of 4 km). The calculation made by PC-SAFT/PMSA equation of state is also shown here for comparison. The result shows that the presence of sulfur dioxide makes carbon dioxide more soluble in high-salinity brines in a temperature range between the critical temperatures of the gases (31.1 °C -157.5 °C). |
