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Correlations have been developed to estimate critical constants of non-polar compounds, petroleum and coal-tar liquids in terms of normal boiling points and specific gravities. The present correlations based on extended database show significant improvement over previous generalized correlations.

A new experimental method has been developed for measuring the equilibrium solubility of heavy solutes in supercritical CO 2 . The micro-SFE (supercritical-fluid extraction) is coupled to supercritical-fluid chromatography (SFC), both operating under the same temperature, pressure, and CO 2 flowrate. Naphthalene, biphenyl, and phenanthrene are chosen to verify the method. The isobaric solubilities of the solutes in the temperature range of 308–338 K and pressure from 8. 0 MPa to 12. 0 MPa are determined. The experimental data are in agreement with literature values and exhibit some characteristics of solid-supercritical-fluid binary system phase equilibrium in the near critical region of solvent.