Abstract
Binary diffusion coefficients, D 12, of the metal acetylacetonates, palladium(II) acetylacetonate and cobalt(III) acetylacetonate, were measured from 308.2 to 343.2 K over the pressure range from 9 to 40 MPa at infinite dilution in supercritical carbon dioxide using the chromatographic impulse response method. The effects of pressure, temperature, density, and viscosity on D 12 values were examined. It was observed that the D 12 values of palladium(II) acetylacetonate and cobalt(III) acetylacetonate were larger than those of lipids with similar molecular weights, such as arachidonic acid and monoolein, respectively. Furthermore, the measured D 12 data of each metal acetylacetonate were well correlated by the hydrodynamic equation D 12/ T as a function of carbon dioxide viscosity.
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