| 초록 |
The objective of this research work is to study both the adsorption equilibria of pure and mixed vapors and the effect of operating conditions (flow rate and composition) on breakthrough curve in an adsorption column packed with activated carbon. In this study, experimental works have been made on the isothermal fixed-bed adsorption of benzene, toluene and p-xylene vapors and their binary and ternary mixtures with nitrogen on activated carbon. From the breakthrough curve analysis, the equilibrium relationships for pure-, binary- and ternary-adsorption on activated carbon were obtained at 30℃. It was found that the pure adsorption equilibria of benzene, toluene and p-xylene on activated carbon can be simply expressed by the Freundlich isotherm equation. In addition, in order to predict binary and ternary adsorption isotherms, we applied the ideal adsorbed solution theory (IAST). From the model prediction of breakthrough curves, the controlling diffusion mechanism in the adsorbent can be appropriately expressed by the linear driving force (LDF) approximation model with the surface diffusion.
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