Fluid-Phase Equilibria in the Binary System Trifluoromethane 1-Phenyltetradecane.

In this study, the phase behavior of an asymmetric system consisting of the refrigerant, trifluoromethane, and 1-phenyltetradecane, a lubricant from the family of alkylbenzenes, is investigated. Equilibrium data were obtained using a synthetic method in the temperature range 253.34−370 K and pressures up to12 MPa. The investigated system exhibits type III phase behavior, according to the classification of van Konynenburg and Scott. The new experimental data were modeled with two cubic equations-of-state, Soave−Redlich−Kwong (SRK) and Peng−Robinson (PR), and were coupled with classical van der Waals mixing rules. A single set of binary parameters was used to predict the global phase behavior of the system for a large range of pressure and temperature. Although the model is simple, it is able to represent correctly the complex phase equilibria of the system studied in this work. [ABSTRACT FROM AUTHOR]