Adsorption Compression Analysis for Supercritical Fluids using Ono-Kondo Model

  • Panita Sumanatrakul Department of Chemical Engineering, Faculty of Engineering, Prince of Songkla University, Songkhla, 90112, Thailand
  • Chayanoot Sangwichien Department of Chemical Engineering, Faculty of Engineering, Prince of Songkla University, Songkhla, 90112, Thailand
  • Gregory Aranovich Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland 21218
  • Marc D Donohue Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland 21218
Keywords: Adsorption Compression, Ono-Kondo model, Supercritical Fluids

Abstract

In this paper, supercritical data has been evaluated and shown to demonstrate adsorption compression. Ono-Kondo analysis of adsorption isotherms for supercritical systems (including nitrogen, methane, and carbon dioxide on activated carbon Filtrasorb 400 and on zeolite 13X) indicates adsorption compression phenomenon at high pressure end just as in subcritical systems. Experimental isotherms for adsorption of supercritical fluids are plotted in Ono-Kondo coordinates with the Henry’s constant estimated based on results of modeling as well as calorimetric and chromatographic measurements. The linear sections of the results show the range of applicability of the classical Ono-Kondo model with constant energies of interactions. The slopes of these linear sections represent values and signs of these energies: negative slopes indicate repulsive interactions in adsorbed phase due to adsorption compression. Switching interactions from attractive to repulsive with an increase in the pressure for supercritical adsorption suggests that adsorbed phase has two regions. One is an attractive region at low-pressures and the other is a repulsive region at high pressures. It can be indicated that the shape of isotherms in Ono-Kondo coordinates can help to understand adsorbate-adsorbate energies; the slope of the line in Ono-Kondo coordinates gives the sign and magnitude of the energy as a function of adsorbate density.

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Published
2011-12-31
How to Cite
Sumanatrakul, P., Sangwichien, C., Aranovich, G., & Donohue, M. D. (2011). Adsorption Compression Analysis for Supercritical Fluids using Ono-Kondo Model. ASEAN Journal of Chemical Engineering, 11(2), 45-52. Retrieved from https://dev.journal.ugm.ac.id/v3/AJChE/article/view/8090
Section
Articles