IMPULSE-RESPONSE ANALYSIS FOR ADSORPTION OF ETHYL-ACETATE ON ACTIVATED CARBON IN SUPERCRITICAL CARBON-DIOXIDE

Adsorption equilibria and mass transport properties for ethyl acetate on activated carbon have been evaluated in the presence of supercritic al carbon dioxide by means of the impulse response technique. A two-co lumn system, one for dissolving solute and one for adsorption, was use d to evaluate the phenomena purely in the adsorption column, The adsor ption equilibrium constant was larger for higher temperature and lower pressure. The apparent heat of adsorption calculated from the tempera ture dependence of the adsorption equilibrium constant was 30-40 kJ/mo l. The intraparticle effective diffusivity was larger for higher tempe rature and lower pressure. The Peclet number that relates to the axial dispersion coefficient was 0.08-0.39. These estimated parameters are in good agreement with those obtained from desorption measurements rep orted in the literature.