Isothermal vapour-liquid equilibrium data for the binary systems of (CHF 3 or C 2 F 6 ) and n-heptane

Isothermal Vapor–Liquid Equilibrium Data for Binary Systems of CHF3 or C2F6 with Methylcyclohexane or Toluene

“…The parameters for the MC alpha function were fitted to vapor pressure data that were reported in the literature for MCH − and for toluene. ,,− The MC alpha parameters that were reported by Williams-Wynn et al , for R-23 and R-116 were used in this study. A one-parameter model was used for both R-23 and R-116, because of the measurement of some VLE data above the refrigerant critical temperatures, in which case the second and third terms of the model become trivial.…”

“… a Set to zero for this study. b Obtained from Williams-Wynn et al c Obtained from Williams-Wynn et al d Regressed to literature data. − e Regressed to literature data. ,,− …”

“…As a part of a study into SC solvents that could replace CO 2 , the performances of two refrigerants, trifluoromethane (R-23) and hexafluoroethane (R-116), have been benchmarked with several different hydrocarbons, including n -alkanes , as well as an alkene and a branched alkane . This current investigation expands the study to include the phase equilibria of R-23 or R-116 with either methylcyclohexane (MCH) or toluene.…”

Isothermal Bubble Pressure Data for the Binary System of C2F6 and n-Octane

“…For systems containing a hydrocarbon and a refrigerant, Williams-Wynn and coworkers showed that a simple thermodynamic model, containing only a cubic equation of state with classical mixing rules, did not adequately describe the behavior of the bubble curve. In further discussions on the modeling of R-23 + n -heptane, they showed that this simple thermodynamic model was also not capable of providing an accurate prediction of the pressure and compositions of the VLLE region for a given isotherm. The models that were used to describe the phase equilibrium data in this study required the capability to describe the occurrence of liquid immiscibilities in the system.…”

“…The thermodynamic models also make it possible to optimize the process by performing multiple process simulations under different process conditions. The most commonly utilized ‘model systems’ contain species from the homogeneous n -alkane series. ,, A number of binary systems involving trifluoromethane, hexafluoroethane, and n -alkanes have been investigated in previous studies. − The experimental data for the system of hexafluoroethane (R-116, perfluoroethane) + n -octane measured in this study are a continuation of the representative measurements for the characterization of R-116 as a supercritical solvent.…”