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Molecules 2018, 23(4), 889; https://doi.org/10.3390/molecules23040889

Continuous Separation of Light Olefin/Paraffin Mixtures on ZIF-4 by Pressure Swing Adsorption and Membrane Permeation

1
Erlangen Catalysis Resource Center (ECRC), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstr. 3, 91058 Erlangen, Germany
2
Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstrasse 3A, 30167 Hannover, Germany
3
Institut für Nichtklassische Chemie e.V. (INC), Permoserstraße 15, 04318 Leipzig, Germany
*
Author to whom correspondence should be addressed.
Received: 23 February 2018 / Revised: 29 March 2018 / Accepted: 5 April 2018 / Published: 11 April 2018
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Abstract

In this study, two zeolitic imidazolate frameworks (ZIFs) called ZIF-4 and ZIF-zni (zni is the network topology) were characterized by sorption studies regarding their paraffin/olefin separation potential. In particular, equilibrated pure and mixed gas adsorption isotherms of ethane and ethene were recorded at 293 K up to 3 MPa. ZIF-4 exhibits selectivities for ethane in the range of 1.5–3, which is promising for continuous pressure swing adsorption (PSA). ZIF-4 shows high cycle stability with promising separation potential regarding ethane, which results in purification of the more industrial desired olefin. Furthermore, both ZIF materials were implemented in Matrimid to prepare a mixed matrix membrane (MMM) and were used in the continuous separation of a propane/propene mixture. The separation performance of the neat polymer is drastically increased after embedding porous ZIF-4 crystals in the Matrimid matrix, especially at higher feed pressures (3–5 barg). Due to the smaller kinetic diameter of the olefin, the permeability is higher compared to the paraffin. View Full-Text
Keywords: ZIF-4; olefin/paraffin separation; pressure swing adsorption (PSA); membrane permeation ZIF-4; olefin/paraffin separation; pressure swing adsorption (PSA); membrane permeation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Hovestadt, M.; Friebe, S.; Helmich, L.; Lange, M.; Möllmer, J.; Gläser, R.; Mundstock, A.; Hartmann, M. Continuous Separation of Light Olefin/Paraffin Mixtures on ZIF-4 by Pressure Swing Adsorption and Membrane Permeation. Molecules 2018, 23, 889.

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