Liquid-Phase Adsorption Kinetics of n-Paraffins on 5A Zeolite

Abstract

The adsorption kinetics of n-hexane from liquid-phase on 5A zeolite crystals, binderless pellets, powder with binder, and pellets with binder are investigated in order to develop the diffusion control mechanism. The adsorption kinetics of n-C₅–n-C₈ from liquid-phase are studied on binderless 5A zeolite pellets and the pellets containing binder. Adsorption rate of n-paraffins on binderless pellets is controlled by micropore diffusion while it is controlled by macropore diffusion on 5A zeolite pellets with binder. For the same adsorbate, the apparent diffusional time constants on the binderless pellets are about 6–11 times larger than those on others.

Keywords:

• adsorption diffusion control mechanism
• adsorption kinetics
• binder
• liquid-phase
• normal paraffins
• 5A zeolite

ACKNOWLEDGMENTS

The authors would like to gratefully acknowledge the financial support of SINOPEC. We also wish to give thanks to all the members of the State Key Laboratory of Chemical Engineering.