Diffusion coefficients of model contaminants in dense CO2

摘要: Dense CO2 extraction is an emerging technology in cleaning and remediation. The successful design implementation of processes based on this require the accurate determination solute diffusivities systems. In work, a Taylor dispersion apparatus was constructed for measuring binary diffusion coefficients benzoic acid, biphenyl, p-dichlorobenzene dense at temperatures 293.15, 298.15, 308.15, 318.15, 323.15 K pressures from approximately 71 to 171 bar. For correlation prediction diffusivity, Enskog kinetic approach with density correction, Liu–Silva–Macedo (LSM) model, Eaton–Akgerman (EA) model were evaluated. gave satisfactory predictions liquid CO2, but it may be inappropriate extrapolate supercritical region. LSM Lennard–Jones fluid theory poor diffusivity its accuracy improved EA rough hard sphere both regions.