Modeling vapor–liquid equilibria of ethanol + 1,1,1,2,3,3,3-heptafluoropropane binary mixtures using PC-SAFT

One objective of the Third Industrial Fluid-Properties Simulation Challenge was the extrapolation of mixture phase equilibrium information obtained from one isotherm to other temperatures. In this work, we present modeling results for the vapor–liquid equilibrium of the ethanol/1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea) mixture obtained with the PC-SAFT equation of state. The required pure-component parameters were determined by fitting pure-component vapor pressures and liquid density data. To get a quantitative description of the mixture, a temperature-independent binary interaction parameter was adjusted to experimental bubble-point data at 283.17 K. Using these parameters, bubble-point pressures at T = 343.13 K were predicted for different concentrations.