PHASE-EQUILIBRIA OF TOLUENE IN MIXTURES WITH HELIUM OR NITROGEN AT HIGH-TEMPERATURES

Phase equilibria are measured for helium + toluene and nitrogen + toluene at temperatures from 423 to 545 K over the pressures of 50-150 bar. A flow apparatus was used for the measurement to reduce the possibility of thermal decomposition of toluene at high temperatures. The results are compared with the calculations from five cubic equations of state. All five equations appear to represent the phase behavior with reasonable accuracy for both mixtures. However, an anomalous value of the binary interaction parameter is required to fit the equilibrium data for helium + toluene.