Modelling solubility of solids in supercritical fluids using fusion properties

The modelling of solid solubilities in supercritical fluids is usually perf ormed by means of thermodynamic models based on cubic equations of state to gether with the use of correlations for estimating the solid properties. Ho wever, it was shown in the literature, that the error in sublimation pressu re, which is very low for high molecular weight compounds, is in many cases responsible for large deviations between experimental and calculated solub ilities. In this work, the sublimation pressure of solids is estimated by u sing experimental fusion data and liquid-vapour equilibrium properties obta ined from an equation of state (EOS). The results provided by this method a re compared with those obtained using sublimation pressures from literature . It is shown that this method allows satisfactory solubility predictions w hen using a reliable EOS. (C) 1999 Elsevier Science B.V. All rights reserve d.