Abstract
The chromatographic impulse response (CIR) method with curve fitting was employed for measuring binary diffusion coefficients D 12 at infinite dilution for polar compounds such as benzoic acid and C 1 to C 3 mono-alcohols in supercritical (SC) carbon dioxide at 313.2 K and pressures higher than 9.5 MPa. The measured D 12 values for the polar compounds were expressed with two correlations which well represent binary diffusion coefficients for non-polar and weak polar compounds, i.e. the correlation of D 12/ T as a function of CO 2 viscosity and the Schmidt number correlation. Moreover, the slope was −0.5 in logarithmic plot of D 12 versus solute molecular weight over the range of molecular weight from 32 to 1138 at 313.2 K and 11.0 MPa.
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