Effect of thermal annealing on a novel polyamide–imide polymer membrane for aggressive acid gas separations

Handle URI:
http://hdl.handle.net/10754/598064
Title:
Effect of thermal annealing on a novel polyamide–imide polymer membrane for aggressive acid gas separations
Authors:
Vaughn, Justin T.; Koros, William J.; Johnson, J.R.; Karvan, Oguz
Abstract:
A fluorinated, 6FDA based polyamide-imide is investigated for the purification of CH 4 from CO 2 and H 2S containing gas streams. Dense polymer films were thermally annealed and showed that increased annealing temperatures at constant annealing time caused transport behavior that does not resemble physical aging. Free volume increased after annealing at 200°C for 24h relative to annealing at 150°C for the same time. CO 2 and CH 4 permeabilities and diffusivities did not decrease as a result of the higher annealing temperature, and in fact, were shown to increase slightly. A change to the intrinsic microstructure that cannot be described by simple, densification based physical aging is hypothesized to be the reason for this trend. Furthermore, annealing increased CO 2 induced plasticization resistance and a temperature of 200°C was shown to have the greatest effect on plasticization suppression. Annealing at 200°C for 24h suppressed pure gas CO 2 plasticization up to 450psia. Fluorescence spectroscopy revealed increased intramolecular charge transfer, which is presumably due to increased electron conjugation over the N-phenyl bond. Additionally, intermolecular charge transfer increased with thermal annealing, as inferred from fluorescence intensity measurements and XRD patterns. 50/50 CO 2/CH 4 mixed gas permeation measurements reveal stable separation performance up to 1000psia. Ternary mixed gas feeds containing toluene/CO 2/CH 4 and H 2S/CO 2/CH 4 show antiplasticization, but more importantly, selectivity losses due to plasticization did not occur up to 900psia of total feed pressure. These results show that the polyamide-imide family represents a promising class of separation materials for aggressive acid gas purifications. © 2012 Elsevier B.V.
Citation:
Vaughn JT, Koros WJ, Johnson JR, Karvan O (2012) Effect of thermal annealing on a novel polyamide–imide polymer membrane for aggressive acid gas separations. Journal of Membrane Science 401-402: 163–174. Available: http://dx.doi.org/10.1016/j.memsci.2012.01.047.
Publisher:
Elsevier BV
Journal:
Journal of Membrane Science
KAUST Grant Number:
KUS-I1-011-21
Issue Date:
May-2012
DOI:
10.1016/j.memsci.2012.01.047
Type:
Article
ISSN:
0376-7388
Sponsors:
This publication is based on work supported by Award No. KUS-I1-011-21, made by King Abdullah University of Science and Technology (KAUST). The authors would also like to thank Dr. Maria Christina Rumi and Josh Thompson at Georgia Tech for their guidance in the fluorescence and XRD measurements, respectively.
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorVaughn, Justin T.en
dc.contributor.authorKoros, William J.en
dc.contributor.authorJohnson, J.R.en
dc.contributor.authorKarvan, Oguzen
dc.date.accessioned2016-02-25T13:11:58Zen
dc.date.available2016-02-25T13:11:58Zen
dc.date.issued2012-05en
dc.identifier.citationVaughn JT, Koros WJ, Johnson JR, Karvan O (2012) Effect of thermal annealing on a novel polyamide–imide polymer membrane for aggressive acid gas separations. Journal of Membrane Science 401-402: 163–174. Available: http://dx.doi.org/10.1016/j.memsci.2012.01.047.en
dc.identifier.issn0376-7388en
dc.identifier.doi10.1016/j.memsci.2012.01.047en
dc.identifier.urihttp://hdl.handle.net/10754/598064en
dc.description.abstractA fluorinated, 6FDA based polyamide-imide is investigated for the purification of CH 4 from CO 2 and H 2S containing gas streams. Dense polymer films were thermally annealed and showed that increased annealing temperatures at constant annealing time caused transport behavior that does not resemble physical aging. Free volume increased after annealing at 200°C for 24h relative to annealing at 150°C for the same time. CO 2 and CH 4 permeabilities and diffusivities did not decrease as a result of the higher annealing temperature, and in fact, were shown to increase slightly. A change to the intrinsic microstructure that cannot be described by simple, densification based physical aging is hypothesized to be the reason for this trend. Furthermore, annealing increased CO 2 induced plasticization resistance and a temperature of 200°C was shown to have the greatest effect on plasticization suppression. Annealing at 200°C for 24h suppressed pure gas CO 2 plasticization up to 450psia. Fluorescence spectroscopy revealed increased intramolecular charge transfer, which is presumably due to increased electron conjugation over the N-phenyl bond. Additionally, intermolecular charge transfer increased with thermal annealing, as inferred from fluorescence intensity measurements and XRD patterns. 50/50 CO 2/CH 4 mixed gas permeation measurements reveal stable separation performance up to 1000psia. Ternary mixed gas feeds containing toluene/CO 2/CH 4 and H 2S/CO 2/CH 4 show antiplasticization, but more importantly, selectivity losses due to plasticization did not occur up to 900psia of total feed pressure. These results show that the polyamide-imide family represents a promising class of separation materials for aggressive acid gas purifications. © 2012 Elsevier B.V.en
dc.description.sponsorshipThis publication is based on work supported by Award No. KUS-I1-011-21, made by King Abdullah University of Science and Technology (KAUST). The authors would also like to thank Dr. Maria Christina Rumi and Josh Thompson at Georgia Tech for their guidance in the fluorescence and XRD measurements, respectively.en
dc.publisherElsevier BVen
dc.subjectCharge transferen
dc.subjectFluorescence spectroscopyen
dc.subjectGas separationsen
dc.subjectPolyamide-imideen
dc.subjectThermal annealingen
dc.titleEffect of thermal annealing on a novel polyamide–imide polymer membrane for aggressive acid gas separationsen
dc.typeArticleen
dc.identifier.journalJournal of Membrane Scienceen
dc.contributor.institutionSchool of Chemical and Biomolecular Engineering, Atlanta, United Statesen
kaust.grant.numberKUS-I1-011-21en
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