Determination of Binary Diffusion Coefficients of Benzene, Phenol, Naphthalene and Caffeine in Supercritical CO2 between 308 and 933 K in the Pressure Range 90 to 160 gar with Supercritical Fluid Chromatography (SFC)

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Abstract
Binary diffusion coefficients D12 have been determined for benzene, phenol, naphthalene and caffeine in supercritical CO2 at 40°C between 80 and 160 bar using the chrpmatographic peak-broadening method (CPB). The observed diffusion coefficients are of the order of 10−4 cm2/s and decrease by about 50% for a pressure rise from 80 to 160 bar. For naphthalene in CO2 the effect of temperature on D12 was investigated between 35 and 60°C at a constant C02 density of 0.6 g/cm3; the energy of activation was found to be 4.7 kJ/mol, With increasing molecular size and polarity of the diffusing compound, adsorption effects are observed which can lead to serious errors.

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