The regeneration of activated carbon loaded with ethyl acetate by supercritical carbon dioxide was investigated in this study. It was found that the adsorptive capacities after several regeneration cycles were still close to that of virgin carbon and remained stable. The effects of temperature, pressure, and flow rate on regeneration efficiency were also investigated. Regeneration was more favorable at higher pressures, but optimal temperatures were found to depend on pressure. A one-parameter mathematic model assuming linear desorption kinetics was proposed which agreed well with the experimental data.Supercritical fluid extraction has received widespread attention over the past years. The applications of this technology in different areas have been reviewed in detail by Gangoli and Thodos (1977), Williams (1981), and Paulaitis et al. (1983). One of these applications is to regenerate adsorbents, such as activated carbon (Paulaitis
The axial dispersion coefficients under supercritical operation in a packed bed were measured by injection of a pulse of methane into supercritical carbon dioxide. The experimental data showed that the axial dispersion coefficient increased with the interstitial velocity and the packed particle diameter. When the operation pressure increased and the operation temperature decreased, the axial dispersion coefficient increased. This trend may be due to the increase of the density and viscosity of the supercritical carbon dioxide. The bed length offered a negligible effect when it exceeded a certain value, while the ratio of bed diameter to particle diameter was larger than 10.Axial dispersion of a gas or a liquid has been extensively studied in the past (
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