Binary diffusion coefficients of acetone in carbon dioxide at 308.2 and 313.2 K in the pressure range from 7.9 to 40 MPa

Binary diffusion coefficients of acetone in carbon dioxide were measured by the Taylor dispersion method at 308.2 K and 7.9 to 40 MPa and at 313.2 K and 8.0 to 37 MPa. The D-12 values obtained From the response curves by the method of fitting in the time domain were more accurate than those obtained by the moment method. At pressures lower than about 8.3 MPa at 308.2 K or 9.1 MPa at 313.2 K, the accuracy in the D-12 values was Found to decrease significantly with decreasing pressure by examining (peak area) x u(a,cal), the values of S-10, the fitting error epsilon, and u(a,cal)/u(a,exp) as a function of pressure. The D-12 values at pressures higher than 8.3 MPa at 308.2 K or 9.1 MPa at 313.2 K were well represented with the Schmidt number correlation. The D-12 data with larger fitting errors (epsilon > 0.01) showed larger deviations from the values predicted by this correlation.