Vapor–liquid phase behavior of the binary systems containing supercritical carbon dioxide

A thermodynamic model based on the perturbation theory is investigated. The perturbed hard-sphere chain (PHSC) equation of state (EOS) is applied to calculate phase behavior of the binary systems containing supercritical carbon dioxide. A calculation program is written. The vapor–liquid phase equilibrium calculation is conducted with the binary systems and a comparison is made between the calculation results and experimental ones. It is shown that the PHSC equation of state can be reliably used for calculating the vapor–liquid phase behavior of carbon dioxide systems when the pressure is very high.