A dynamic column breakthrough apparatus for adsorption capacity measurements with quantitative uncertainties

Hofman, Paul S., Rufford, Thomas E., Chan, K. Ida and May, Eric F. (2012) A dynamic column breakthrough apparatus for adsorption capacity measurements with quantitative uncertainties. Adsorption, 18 3-4: 251-263. doi:10.1007/s10450-012-9398-y

Author Hofman, Paul S.
Rufford, Thomas E.
Chan, K. Ida
May, Eric F.
Title A dynamic column breakthrough apparatus for adsorption capacity measurements with quantitative uncertainties
Journal name Adsorption   Check publisher's open access policy
ISSN 0929-5607
Publication date 2012-11
Sub-type Article (original research)
DOI 10.1007/s10450-012-9398-y
Volume 18
Issue 3-4
Start page 251
End page 263
Total pages 13
Place of publication Secaucus, NJ United States
Publisher Springer New York LLC
Collection year 2012
Language eng
Formatted abstract
A dynamic column breakthrough (DCB) apparatus was used to study the separation of CH 4 + N 2 gas mixtures using two zeolites, H +-mordenite and 13X, at temperatures of (229.2 and 301.9) K and pressures to 792.9 kPa. The apparatus is not limited to the study of dilute adsorbates within inert carrier gases because the instrumentation allows the effluent flow rate to be measured accurately: a method for correcting apparent effluent mass flow readings for large changes in effluent composition is described. The mathematical framework used to determine equilibrium adsorption capacities from the dynamic adsorption experiments is presented and includes a method for estimating quantitatively the uncertainties of the measured capacities. Dynamic adsorption experiments were conducted with pure CH 4, pure N 2 and equimolar CH 4 + N 2 mixtures, and the results were compared with similar static adsorption experiments reported in the literature. The 13X zeolite had the greater adsorption capacity for both CH 4 and N 2. At 792 kPa the equilibrium capacities of the 13X zeolite increased from 2.13 ± 0.14 mmol g -1 for CH 4 and 1.36 ± 0.10 mmol g -1 for N 2 at 301.9 K to 3.97 ± 0.19 mmol g -1 for CH 4 and 3.33 ± 0.12 mmol g -1 for N 2 at 229.2 K. Both zeolites preferentially adsorbed CH4; however, the mordenite had a greater equilibrium selectivity of 3.5±0.4 at 301.9 K. Equilibrium selectivities inferred from pure fluid capacities using the Ideal Adsorbed Solution theory were limited by the accuracy of the literature pure fluid Toth models. Equilibrium capacities with quantitative uncertainties derived directly from DCB measurements without reference to a dynamic model should help increase the accuracy of mass transfer parameters extracted by the regression of such models to time dependent data
Keyword Adsorption
Packed bed
Pressure swing adsorption
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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Created: Thu, 17 Jan 2013, 12:58:12 EST by Dr Thomas Rufford on behalf of School of Chemical Engineering