Application of a new crossover treatment to a generalized cubic equation of state

Abstract

In spite of recent progress in the field of equations of state, the use of cubic equations of state (EoS) such as Redlich–Kwong EoS remains common in the industry. It has already been proved that such classical EoS which follow a mean field approach fail to represent physical properties in the vicinity of the critical point. Moreover, it is well known that in this area the representation of thermodynamic properties must rely on scale invariance. In this work, a new Landau-crossover treatment for pure fluids with two parameters has been applied to a generalized form of cubic EoS. The model calculations have been confronted with experimental data. The crossover treatment allows a correct representation of PVT values in the critical region while keeping classical results at distance. Discussion on possible improvements is also provided.