Isothermal (vapour + liquid) equilibrium data for binary systems of (n-hexane + CO2 or CHF3)

Experimental determination of the critical loci for R-23+(n-propane or n-hexane) and R-116+n-propane binary mixtures

“…Alternatively, the solvent can be replaced with a more polar solvent. This study continues a previous investigation into the use of trifluoromethane (R-23) and hexafluoroethane (R-116) as supercritical solvents [4].…”

“…The isothermal vapour-liquid equilibrium (VLE) data of the R-23 + n-propane system were [4,[17][18][19], with differences between the experimental data and the literature data of less than 0.3%, and for n-propane [7,8,[20][21][22], with deviations of less than 0.5% between the experimental and the literature data. Due to the large volumes of vapour pressure data that were available for n-propane, several authors that provided data over the range of temperatures that were investigated in this study were utilised, rather than using the entire n-propane vapour pressure dataset.…”

“…Khalil [6] from the work of Williams-Wynn et al [4] are also included on this plot. The RKtype correlations of the critical locus curve are also included in Figure 12.…”

“…The models for each isotherm were fitted to the data using the direct (phi-phi) data regression approach in Aspen V8.4 [15] using a modified Barker's objective function (minimisation of the pressure and vapour phase composition deviations). The fit of the models to the experimental data were quantified with the mean relative deviations (MRDs) and the absolute average relative deviations (AARDs) for each isotherm [4].…”

“…[8]. For the R-23 + n-hexane system, the data of Williams-Wynn et al [4] were used, and for the R-116 + n-hexane, the data that were reported by Ramjugernath et al [9] were extrapolated to the critical point.…”