On the liquid mixtures of xenon, alkanes and perfluorinated compounds

The fluid phase behaviour of binary mixtures of xenon and the lighter perfl uoro-n-alkanes, and and CF4 C2F6, of propane and sulfur hexafluoride has be en examined using the statistical associating fluid theory for (SF6) potent ials of variable attractive range (SAFT-VR). We found that the binary inter action parameters calculated in previous work for (n-alkane + perfluoro-n-a lkane) systems and for can be used to predict the (Xe + SF6), existing phas e diagrams of (Xe + perfluoro-n-alkane) and mixtures, respectively. These r esults (propane + SF6) are consistent with the view that mixtures of (xenon + perfluorinated-compound) can be regarded as a special case of mixtures o f (n-alkane + perfluorinated-compound) and provide another example of the " alkane-like" behaviour of xenon previously reported.