Abstract
A method is proposed to correlate and to predict the solubilities of pure solids in supercritical gases. The method is based on a very simple thermodynamic model which links the properties of pure components to the enhancement factor E. The only parameters of pure solids required in order to evaluate their solubilities in compressed gases are density, melting point and vapor pressure. According to the proposed method, each supercritical solvent deserves an ‘ad hoc’ rule. The reliability of the method was tested on the basis of the literature data for several polar and non polar solids in four supercritical solvents (ethane, CO 2, CHF 3 and CCLF 3). Some other equilibrium data pertaining to the solubility of solid hydrocarbons and caffeine in supercritical CO 2 are also considered. Further, a well known literature relation which links the enhancement factor, E, to the solvent density, ϱ, is justified according the proposed thermodynamic model.
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