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Air Separation at Cryogenic Temperature Using MFI membranes
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.
2014 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 192, p. 14-17Article in journal (Refereed) Published
Abstract [en]

In the present work, zeolite membranes were for the first time evaluated for separations at cryogenic temperatures. MFI membranes were evaluated with a feed of synthetic air, at varying feed pressures between 1– 5 bar and a sweep stream of helium at a constant pressure of 1 bar for temperatures in the range 77 to 110 K. When the feed pressure was 1 bar, the highest O2/N2 separation factor was 3.9, corresponding to a separation selectivity of 4.1, with an oxygen permeance of 6.7×10-7 mol m-2 s-1 Pa-1 at the optimum temperature 79 K. This membrane performance is just above the upper bound in the 2008 Robeson selectivity- permeability plot for polymeric membranes. As the feed pressure increased, the maximum separation factors for O2/N2 decreased while the optimum separation temperatures increased. It is inferred that the separation is governed by condensation and effective transport of oxygen in the zeolite pores under these conditions. However, the adsorption of nitrogen, and thereby the transport of nitrogen, likely increases as the pressure is increased, which reduce the selectivity. To test this hypothesis, the feed was diluted with 33% helium and the total feed pressure was maintained at 1 bar, corresponding to a partial pressure of air of 0.66 bar. In this case, the maximum separation factor increased to 4.3, which supports the proposed separation mechanism.

Place, publisher, year, edition, pages
2014. Vol. 192, p. 14-17
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
URN: urn:nbn:se:ltu:diva-2449DOI: 10.1016/j.micromeso.2013.09.016ISI: 000336713100004Scopus ID: 2-s2.0-84900501247Local ID: 0124ef99-455a-4ffb-a0cf-508c2f589740OAI: oai:DiVA.org:ltu-2449DiVA, id: diva2:975301
Note
Validerad; 2014; Bibliografisk uppgift: Special issue devoted to the 6th International Zeolite Membrane Meeting; 20130919 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Ye, PengchengSjöberg, ErikHedlund, Jonas

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