Adsorption of organics on MSC in supercritical CO2 fluid

摘要

Supercritical CO2 fluid is attractive solvent which can be changed solubility of organics with changes of pressure and temperature. New process of adsorptive separation using supercritical fluid will be possible since removal of adsorbate from adsorbent can be performed efficiently.In this study, chromatographic measurements were made for the adsorption of benzene, toluene and m-xylene on molecular sieving carbon (MSC) in supercritical fluid CO2 mixed with organics. Supercritical chromatograph packed with MSC was used to detect pulse responses of organics. Adsorption equilibria and adsorption dynamics for organics were obtained by moment analysis of the response peaks. Dependences of adsorption equilibrium constants, K*, and micropore diffusivity, D, on amount adsorbed were examined