Application of a Crossover Equation of State to Describe Phase Equilibrium and Critical Properties of Propane

An equation of state that predicts the thermodynamic behavior of propane is formulated. This equation takes into account the global behavior that includes the singular thermodynamic behavior asymptotically close to the critical point and the crossover to the regular thermodynamic behavior far away from the critical point. The formulated equation based on the transformation of a truncated classical Landau expansion. This equation of state (EOS) can represent the thermodynamic properties of propane in a wide range of temperatures and densities around the critical point. Comparisons of the pressure P–ρ–T data measured by Mark Mclinden of NIST group calculated with crossover EOS and those computed by the EOS of Eric Lemmon and selected results of other experimentalists are presented, as well as the isochoric-specific heat data measured by Abdulagatov et al. of the Russian groups are presented. We also give the comparison with a set of isobaric-specific heat data of Yesavage et al. The description of the rectilinear diameter singularity near the critical point is also discussed.