Investigation Of Phase Equilibria And Interfacial Properties For Supercritical Carbon Dioxide Mixture

In this thesis, the PC-SAFT and density gradient theory (DGT) are used to construct a non-uniform equation of state (EOS) for the investigation of phase equilibria and interfacial properties of supercritical CO₂ and hydrocarbon mixtures. The model parameters are determined by fitting to the experimental data. By using the regressed model parameters and the bulk properties as input, the surface tensions of CO₂-butane, CO₂-decane, CO₂-benzene, CO₂-cyclohexane and CO₂-tetradecane mixtures are predicted. The relationship between the surface tensions and the operation conditions like temperature and pressure is demonstrated.