Correlation of the solubility of low-volatile organic compounds in near- and supercritical fluids.: Part 1:: 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 CO, and the natural dyestuff beta-carotene in three compressed gases, i.e. CO, CCIF3, and N2O. For all systems except beta-carotene + N2O solubility data measured up to 100 MPa and more (180 MPa for beta-carotene + CO2 and + CCIF3) are available. Experimental results for the systems beta-carotene + CO2 and + CCIF3 are also reported. Here, adamantane serves as an example for a relatively high-soluble substance, while beta-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. (C) 2002 Elsevier Science B.V. All rights reserved.