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 compound, is in many cases responsible of large deviations between experimental and calculated solubilities. In this work, the sublimation pressure of the solid compound 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 also satisfactory predictions of the solubility of two solids in supercritical fluids.

Modelling solubility of Solids in Supercritical Fluids Using Fusion Properties

ALESSI, PAOLO;CORTESI, ANGELO;KIKIC, IRENEO
1999-01-01

Abstract

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 compound, is in many cases responsible of large deviations between experimental and calculated solubilities. In this work, the sublimation pressure of the solid compound 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 also satisfactory predictions of the solubility of two solids in supercritical fluids.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2297003
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