(88a) Phase Behavior, Densities, and Viscosities of Propylene + Toluene and Ethylene + Toluene Mixtures at Temperatures to 580 K and Pressures to 70 Mpa

A comprehensive high-pressure, high-temperature (HPHT) fluid property data base is needed with entries for pure components and mixtures so that contemporary equations of state and transport models can be tested, refined, and verified to accurately describe fluid properties under extreme operating conditions. In this study, we report phase behavior data for propylene + toluene and ethylene + toluene mixtures at temperatures from 295 to 580 K and pressures to 8.5 MPa. We also report densities and viscosities for the two mixtures at temperatures from 295 to 555 K and pressures to 70 MPa. Phase behavior and density data are simultaneously determined using a windowed, variable-volume, high-pressure view cell coupled with a linear variable differential transformer (LVDT). Mixture viscosities in the single phase region are determined using a windowed, rolling-ball viscometer also equipped with an LVDT. The phase behavior data measured in this study reasonably agree with literature data for the two studied systems. Both density and viscosity data are correlated with modified Tait equations for the purpose of interpolation. The phase behavior and mixture density data are modeled with Perturbed–Chain Statistical Associating Fluid Theory (PC-SAFT) equations of state (EoS). The PC-SAFT equation provides best fit of the high-pressure phase behavior and mixture density data for both systems. Viscosity data are modeled with the free volume theory (FVT) model. The modeling results are presented in the talk. Further phase behavior, density and viscosity studies are in progress with multicomponent mixtures.