Proceedings (su CD e senza ISBN) della Conferenza "8th International Conference on Properties and Phase equilibria for Product and Process design", Noordwijkerhout (NL), 26 aprile - 1 maggio 1998. -
The modelling of solid solubilities in supercritical fluids is usually performed by
means of thermodynamic models based on cubic equations of state together with the use
of correlations for estimating the solid properties. However, it was shown in the
literature, that the sublimation pressure, very low for high molecular weight compounds,
is in many cases responsible of large deviations between experimental and calculated
solubilities. In this work, the sublimation pressure of solids is estimated by using
experimental fusion data and liquid-vapour equilibrium properties obtained from the
equation of state. The results provided by this method are compared with those obtained
using sublimation pressures from literature. It is shown that this method leads to
realistic values of binary interaction parameters k12 and allows satisfactory solubility
predictions for two solids in supercritical fluids.
