Dense film polyimide membranes for aggressive sour gas feed separations

Handle URI:
http://hdl.handle.net/10754/597925
Title:
Dense film polyimide membranes for aggressive sour gas feed separations
Authors:
Kraftschik, Brian; Koros, William J.; Johnson, J.R.; Karvan, Oguz
Abstract:
Dense film membranes of the copolyimide 6FDA-DAM:DABA (3:2) are studied for simultaneous removal of CO2 and H2S from sour natural gas streams. Pure and mixed gas permeation as well as pure gas sorption data are reported at 35°C and pressures up to 62bar. The H2S partial pressures used are representative of highly aggressive field operations. Penetrant-induced plasticization effects are evident at feed pressures below 1bar in pure H2S feeds; sub-Tg thermal annealing is used to effectively mitigate this effect, and these annealed films are used throughout the study. Surprisingly, H2S/CH4 selectivity nearly doubles for mixed gas testing in comparison to the pure component ideal selectivity values and approaches the level of a state-of-the-art glassy polymer, cellulose acetate (CA), at H2S partial pressures above 2bar. Furthermore, permeation experiments using a 9.95% H2S, 19.9% CO2, 70.15% CH4 mixture at low feed pressures give CO2/CH4 selectivity of up to 49-over 30% greater than the pure component selectivity for 6FDA-DAM:DABA (3:2). The overall sour gas separation performance of this polyimide is comparable to high-performance rubbery polymer membranes, which have been reported for only moderate H2S partial pressure feeds, and is superior to that for CA based on a practical combined acid gas separation efficiency metric that we introduce. Finally, methods for continued development of the current polyimide membrane material for aggressive sour gas separations are presented. © 2012 Elsevier B.V.
Citation:
Kraftschik B, Koros WJ, Johnson JR, Karvan O (2013) Dense film polyimide membranes for aggressive sour gas feed separations. Journal of Membrane Science 428: 608–619. Available: http://dx.doi.org/10.1016/j.memsci.2012.10.025.
Publisher:
Elsevier BV
Journal:
Journal of Membrane Science
Issue Date:
Feb-2013
DOI:
10.1016/j.memsci.2012.10.025
Type:
Article
ISSN:
0376-7388
Sponsors:
The authors would like to gratefully thank the King Abdullah University of Science and Technology (KAUST) for generously funding this work.
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorKraftschik, Brianen
dc.contributor.authorKoros, William J.en
dc.contributor.authorJohnson, J.R.en
dc.contributor.authorKarvan, Oguzen
dc.date.accessioned2016-02-25T12:58:59Zen
dc.date.available2016-02-25T12:58:59Zen
dc.date.issued2013-02en
dc.identifier.citationKraftschik B, Koros WJ, Johnson JR, Karvan O (2013) Dense film polyimide membranes for aggressive sour gas feed separations. Journal of Membrane Science 428: 608–619. Available: http://dx.doi.org/10.1016/j.memsci.2012.10.025.en
dc.identifier.issn0376-7388en
dc.identifier.doi10.1016/j.memsci.2012.10.025en
dc.identifier.urihttp://hdl.handle.net/10754/597925en
dc.description.abstractDense film membranes of the copolyimide 6FDA-DAM:DABA (3:2) are studied for simultaneous removal of CO2 and H2S from sour natural gas streams. Pure and mixed gas permeation as well as pure gas sorption data are reported at 35°C and pressures up to 62bar. The H2S partial pressures used are representative of highly aggressive field operations. Penetrant-induced plasticization effects are evident at feed pressures below 1bar in pure H2S feeds; sub-Tg thermal annealing is used to effectively mitigate this effect, and these annealed films are used throughout the study. Surprisingly, H2S/CH4 selectivity nearly doubles for mixed gas testing in comparison to the pure component ideal selectivity values and approaches the level of a state-of-the-art glassy polymer, cellulose acetate (CA), at H2S partial pressures above 2bar. Furthermore, permeation experiments using a 9.95% H2S, 19.9% CO2, 70.15% CH4 mixture at low feed pressures give CO2/CH4 selectivity of up to 49-over 30% greater than the pure component selectivity for 6FDA-DAM:DABA (3:2). The overall sour gas separation performance of this polyimide is comparable to high-performance rubbery polymer membranes, which have been reported for only moderate H2S partial pressure feeds, and is superior to that for CA based on a practical combined acid gas separation efficiency metric that we introduce. Finally, methods for continued development of the current polyimide membrane material for aggressive sour gas separations are presented. © 2012 Elsevier B.V.en
dc.description.sponsorshipThe authors would like to gratefully thank the King Abdullah University of Science and Technology (KAUST) for generously funding this work.en
dc.publisherElsevier BVen
dc.subjectHydrogen sulfideen
dc.subjectNatural gas purificationen
dc.subjectPolyimide membranesen
dc.subjectSour gasen
dc.titleDense film polyimide membranes for aggressive sour gas feed separationsen
dc.typeArticleen
dc.identifier.journalJournal of Membrane Scienceen
dc.contributor.institutionGeorgia Institute of Technology, Atlanta, United Statesen
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