2012•Russian Journal of Physical Chemistry ARequires access

Equation of state and phase behavior of a propane-tetrafluoroethane mixture

А. А. Вассерман, V P Malchevsky

Abstract

A general equation of state was derived for a propane-tetrafluoroethane mixture in a form representing the free Helmholtz energy of a mixture as the function of density, temperature, and composition. Coefficients of equation were determined according to data on the density of the mixture and assuming the equilibrium condition of phases. The equation describes the thermodynamic properties of vapor and liquid in the temperature range from 255 to 400 K under pressures up to 6 MPa. The thermodynamic behavior of the mixture at the saturation state was analyzed. It is established that the difference between the temperatures of saturated vapor and of liquid on isobars for four compositions did not exceed 1.8 K.

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Key concepts: Thermodynamics, Isobar, Equation of state, Helmholtz free energy, Chemistry, Propane, Vapor–liquid equilibrium, Saturation (graph theory)