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 D12 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 D12 values was found to decrease significantly with decreasing pressure by examining (peak area)_ua, cal , the values of S10 , the fitting error =, and ua, cal ua, exp as a function of pressure. The D12 values at pressures higher than 8.3 MPa at 308.2 K or 9.1 MPa at 313.2 K were well represeInted with the Schmidt number correlation. The D12 data with larger fitting errors (=>0.01) showed larger deviations from the values predicted by this correlation.