Vapor-liquid equilibria of (CF3I + CO2) at the temperature of 243.150K

It has become an imperative case on seeking the substitute of SF₆ for its severe greenhouse effect in recent years, not only for scientists but also the electricity sectors. CF₃I, as a substitute gas for SF₆ with lower Global Warming Potential (GWP), has been investigated. The use of pure CF₃I in gas insulated switchgear (GIS) and gas insulated metal enclosed transmission line (GIL) is difficult because CF₃I has a high dew temperature. We have therefore mixed CF₃I with CO₂. In this paper, an apparatus was used to get the vapor-liquid equilibrium data for (CF₃I + CO₂) system at 243.150 K. All of the experimental data were correlated with the Peng-Robinson (PR) EoS using the classical van der Waals (vdW) mixing rule (PR-vdW model). The results show the changing rule for the vapor pressure and its corresponding mole fraction of (CF₃I + CO₂) gas mixtures to suit the operation environment in GIS/GIL and supply an accurate basis for the application of (CF₃I + CO₂) gas mixtures in electric equipment.