Binary mixtures in and beyond the critical region: thermodynamic properties

An extended law of corresponding states, in combination with a parametric crossover equation of state, is applied to the prediction of thermodynamic properties and phase behavior of pure fluids and binary mixtures over a wide region around vapor–liquid critical points. For pure fluids, a generalized form of the model is given that requires only the acentric factor of the pure component. For mixtures, the critical locus is also required. A good representation of thermodynamic property data is achieved in the range of temperatures 0.8 Tc(x)≤T≤1.5 Tc(x) and densities 0.35 ρc(x)≤ρ≤1.65 ρc(x).