Correlation of the solubility of low-volatile organic compounds in near- and supercritical fluids. Part I: applications to adamantane and β-carotene

A new simplified form of an equation of state suitable for the correlation of pVT-data is presented. The new equation of state is capable to model pVT-data in the low- and high-pressure regions as well as in the critical region. Taking a fugacity approach as a basis, we have calculated the solubility of several low-volatile solid organic compounds, in particular of the globular molecule adamantane in CO2 and the natural dyestuff β-carotene in three compressed gases, i.e. CO2, CClF3, and N2O. For all systems except β-carotene+N2O solubility data measured up to 100 MPa and more (180 MPa for β-carotene+CO2 and+CClF3) are available. Experimental results for the systems β-carotene+CO2 and+CClF3 are also reported. Here, adamantane serves as an example for a relatively high-soluble substance, while β-carotene represents low-soluble solutes. Solubility maxima, which have been found experimentally as a function of pressure or density at constant temperature, are considered in the correlations.