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Adsorption and Diffusion – Basis for Molecular Understanding of Permeation through Molecular Sieve Membranes

  1. Dr. Christian Chmelik1,
  2. Dr. Hartwig Voß3,
  3. Helge Bux2,
  4. Prof. Dr. Jürgen Caro2

Article first published online: 26 JAN 2011

DOI: 10.1002/cite.201000179

Issue

Chemie Ingenieur Technik

Chemie Ingenieur Technik

Special Issue: Adsorption – Delving into the Molecular Scale

Volume 83, Issue 1-2, pages 104–112, January, 2011

Additional Information

How to Cite

Chmelik, C., Voß, H., Bux, H. and Caro, J. (2011), Adsorption and Diffusion – Basis for Molecular Understanding of Permeation through Molecular Sieve Membranes. Chemie Ingenieur Technik, 83: 104–112. doi: 10.1002/cite.201000179

Author Information

  1. 1

    Faculty of Physics and Geosciences, Leipzig University, Linnéstraße 5, 04103 Leipzig, Germany

  2. 2

    Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstraße 3A, 30167 Hannover, Germany

  3. 3

    BASF SE, Process Engineering, Membrane Separation Processes, GCT/C-L540, 67056 Ludwigshafen, Germany

Publication History

  1. Issue published online: 26 JAN 2011
  2. Article first published online: 26 JAN 2011
  3. Manuscript Accepted: 30 NOV 2010
  4. Manuscript Revised: 25 NOV 2010
  5. Manuscript Received: 30 SEP 2010

Funded by

  • DFG Priority Program 1362 Porous Metal-Organic Frameworks
  • BASF SE

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Keywords:

  • 1-Butene/i-butene separation;
  • CO2/CH4 separation;
  • Ethene/ethane separation;
  • ZIF-8 membrane

Abstract

In three case studies, (i) 1-butene/i-butene separation on a ZSM-5 membrane, (ii) carbon dioxide/methane, and (iii) ethene/ethane separations on a zeolitic imidazolate framework 8 (ZIF-8) type metal organic framework (MOF) membrane, it is demonstrated that the membrane selectivity for the separation of a gas mixtures can be well described and even predicted by the interplay of mixture adsorption and mixture diffusion according to the simple relation membrane selectivity = adsorption selectivity × diffusion selectivity. The mixed gas adsorption and diffusion data which are necessary for the above calculation can be derived cost and time effective by sorption uptake/desorption studies on giant single crystals with IR microscopy (IRM) detection.

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