Carbon molecular sieve membranes derived from Matrimid® polyimide for nitrogen/methane separation

Handle URI:
http://hdl.handle.net/10754/597731
Title:
Carbon molecular sieve membranes derived from Matrimid® polyimide for nitrogen/methane separation
Authors:
Ning, Xue; Koros, William J.
Abstract:
A commercial polyimide, Matrimid® 5218, was pyrolyzed under an inert argon atmosphere to produce carbon molecular sieve (CMS) dense film membranes for nitrogen/methane separation. The resulting CMS dense film separation performance was evaluated using both pure and mixed N2/CH4 permeation tests. The effects of final pyrolysis temperature on N 2/CH4 separation are reported. The separation performance of all CMS dense films significantly exceeds the polymer precursor dense film. The CMS dense film pyrolyzed at 800 C shows very attractive separation performance that surpasses the polymer membrane upper bound line, with N 2 permeability of 6.8 Barrers and N2/CH4 permselectivity of 7.7 from pure gas permeation, and N2 permeability of 5.2 Barrers and N2/CH4 permselectivity of 6.0 from mixed gas permeation. The temperature dependences of permeabilities, sorption coefficients, and diffusion coefficients of the membrane were studied, and the activation energy for permeation and diffusion, as well as the apparent heats of sorption are reported. The high permselectivity of this dense film is shown to arise from a significant entropic contribution in the diffusion selectivity. The study shows that the rigid 'slit-shaped' CMS pore structure can enable a strong molecular sieving effect to effectively distinguish the size and shape difference between N2 and CH4. © 2013 Elsevier Ltd. All rights reserved.
Citation:
Ning X, Koros WJ (2014) Carbon molecular sieve membranes derived from Matrimid® polyimide for nitrogen/methane separation. Carbon 66: 511–522. Available: http://dx.doi.org/10.1016/j.carbon.2013.09.028.
Publisher:
Elsevier BV
Journal:
Carbon
Issue Date:
Jan-2014
DOI:
10.1016/j.carbon.2013.09.028
Type:
Article
ISSN:
0008-6223
Sponsors:
The authors acknowledge the support from King Abdullah University of Science and Technology (KAUST) for funding this research project.
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorNing, Xueen
dc.contributor.authorKoros, William J.en
dc.date.accessioned2016-02-25T12:55:42Zen
dc.date.available2016-02-25T12:55:42Zen
dc.date.issued2014-01en
dc.identifier.citationNing X, Koros WJ (2014) Carbon molecular sieve membranes derived from Matrimid® polyimide for nitrogen/methane separation. Carbon 66: 511–522. Available: http://dx.doi.org/10.1016/j.carbon.2013.09.028.en
dc.identifier.issn0008-6223en
dc.identifier.doi10.1016/j.carbon.2013.09.028en
dc.identifier.urihttp://hdl.handle.net/10754/597731en
dc.description.abstractA commercial polyimide, Matrimid® 5218, was pyrolyzed under an inert argon atmosphere to produce carbon molecular sieve (CMS) dense film membranes for nitrogen/methane separation. The resulting CMS dense film separation performance was evaluated using both pure and mixed N2/CH4 permeation tests. The effects of final pyrolysis temperature on N 2/CH4 separation are reported. The separation performance of all CMS dense films significantly exceeds the polymer precursor dense film. The CMS dense film pyrolyzed at 800 C shows very attractive separation performance that surpasses the polymer membrane upper bound line, with N 2 permeability of 6.8 Barrers and N2/CH4 permselectivity of 7.7 from pure gas permeation, and N2 permeability of 5.2 Barrers and N2/CH4 permselectivity of 6.0 from mixed gas permeation. The temperature dependences of permeabilities, sorption coefficients, and diffusion coefficients of the membrane were studied, and the activation energy for permeation and diffusion, as well as the apparent heats of sorption are reported. The high permselectivity of this dense film is shown to arise from a significant entropic contribution in the diffusion selectivity. The study shows that the rigid 'slit-shaped' CMS pore structure can enable a strong molecular sieving effect to effectively distinguish the size and shape difference between N2 and CH4. © 2013 Elsevier Ltd. All rights reserved.en
dc.description.sponsorshipThe authors acknowledge the support from King Abdullah University of Science and Technology (KAUST) for funding this research project.en
dc.publisherElsevier BVen
dc.titleCarbon molecular sieve membranes derived from Matrimid® polyimide for nitrogen/methane separationen
dc.typeArticleen
dc.identifier.journalCarbonen
dc.contributor.institutionGeorgia Institute of Technology, Atlanta, United Statesen
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