Molecular diffusion coefficients of phenylmethanol, 1-phenylethanol, 2-phenylethanol, 2-phenyl-1-propanol, and 3-phenyl-1-propanol in supercritical carbon dioxide

The Taylor-Aris chromatographic technique was employed for the determination of the diffusion coefficients of phenylmethanol, 1-phenylethanol, 2-phenylethanol, 2-phenyl-1-propanol, and 3-phenyl-1-propanol at infinite dilution in supercritical carbon dioxide from 313. 16 to 333.16 K and pressures between 15.0 and 35.0 MPa. Diffusivities were correlated with temperature, pressure, solvent density and solvent viscosity, and 12 predictive equations were compared with experimental data: Wilke-Chang, Lusis-Ratcliff, Tyn-Calus, Kooijman, Lai-Tan, Catchpole-King, Eaton-Akgerman, He, He-Yu, Liu-Silva-Macedo, Dariva-Coelho-Oliveira, and Rah-Kwak-Eu-Laffleur. Considerations regarding the diffusion coefficients of the isomers were also made. (C) 2007 Elsevier B.V. All rights reserved.