The measurement and correlation of the experimental binary diffusion coefficients of 2,3-dimethylaniline, 2,6-dimethylaniline, 2-methylanisole, 4-methylanisole and 3-nitrotoluene in supercritical carbon dioxide is reported. Results were obtained using the Taylor-Aris dispersion technique, at 313, 323, and 333 K, and in a pressure range from 15.0 to 35.0 MPa. The diffusivity experimental data were correlated with temperature, pressure and carbon dioxide density and viscosity. Moreover, the experimental results were compared with the values estimated by several semiempirical equations. (C) 2008 Elsevier B.V. All rights reserved.