Analysis and Interpretation of Zero Length Column Response Curves

Enzo Mangano*, Stefano Brandani, Douglas M. Ruthven

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

To obtain reliable diffusivity data it is essential that the zero length columns (ZLC) response curve is measured under conditions of kinetic control. For systems with a mildly favorable isotherm, the form of the ZLC response curve under equilibrium control is very similar to that for a linear system under kinetic control. For an equilibrium controlled system, however, the response curve plotted as c/c(0) vs Ft (total volume of purge gas passed through the sample at time t) should be invariant with the purge flow rate. Therefore, these two situations are easily distinguishable. Unfortunately this check has often been omitted in reported ZLC studies, leading to erroneous apparent diffusivity values.

Original languageEnglish
Pages (from-to)1714-1718
Number of pages5
JournalChemie Ingenieur Technik - CIT
Volume85
Issue number11
DOIs
Publication statusPublished - Nov 2013

Keywords

  • 13X Zeolite
  • Diffusion
  • Sorption kinetics
  • Zero length column
  • FREQUENCY-RESPONSE
  • CARBON-DIOXIDE
  • 13X ZEOLITE
  • DIFFUSION
  • CO2
  • EQUILIBRIUM
  • ADSORBENTS
  • PELLETS

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