Fluid-phase-equilibrium prediction of fluorocompound-containing binary systems with the predictive E-PPR78 model

- The applicability range of the predictive E-PPR78 equation of state is extended.
- Six new groups: C2F6,CF3, CF2, =CF2⇔=CF, C2H4F2 and C2H2F4 are added.
- The E-PPR78 model is now applicable to fluorocompound-containing mixtures.

In order to reduce the overall emissions of greenhouse gases and to be in compliance with the current environmental regulations, a new class of refrigerants has appeared. Such refrigerants are generally multi-component systems that contain a fluorocompound mixed with CO2 and/or an alkane. In order to design processes involving such blends or to implement a product-design approach aimed at identifying new refrigerant mixtures, an equation of state (EoS) able to predict the properties of fluorocompound-containing systems is required. In order to reach this goal, it was decided in this study to add six fluorinated groups to the Enhanced-PPR78 model which combines the Peng-Robinson EoS and a group contribution method aimed at estimating the binary interaction parameters, kij(T), involved in Van der Waals one-fluid mixing rules.