Toluene impurity effects on CO2 separation using a hollow fiber membrane for natural gas

Omole, Imona C.; Bhandari, Dhaval; Miller, Stephen J.; Koros, William J.

doi:10.1016/j.memsci.2010.12.035

Cited by 36 publications

(32 citation statements)

References 28 publications

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“…Toluene is a known antiplasticizer when incorporated into glassy polymers at low concentrations [5,8,56]. At such conditions, toluene can occupy free volume in a polymer matrix and could hinder chain motion, both of which could reduce penetrant diffusivity [22].…”

Section: Figurementioning

confidence: 99%

“…Tanihara et al [4] reported that after 1600-7600 ppm of toluene was introduced to an equimolar H 2 /CH 4 feed gas mixture at 10 atm and 50 o C, a polyimide hollow fiber experienced a ~60% loss in H 2 permeance and an ~84% loss in H 2 /CH 4 selectivity. Omole et al [5] observed that as toluene concentration increased in a CO 2 /CH 4 mixture feed stream, CO 2 permeance in a crosslinked polyimide hollow fiber decreased by as much as 80%, and CO 2 /CH 4 selectivity initially increased from ~37 to ~39 at low toluene concentration (50 ppm) before decreasing to ~31 at higher toluene concentration (1000 ppm). Additionally, different contaminants may have different effects on light gas (e.g., H 2 , CO 2 and CH 4 ) permeation properties.…”

Section: Introductionmentioning

confidence: 99%

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Influence of toluene on CO2 and CH4 gas transport properties in thermally rearranged (TR) polymers based on 3,3′-dihydroxy-4,4′-diamino-biphenyl (HAB) and 2,2′-bis-(3,4-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA)

Liu

Galizia

Gleason

et al. 2016

Journal of Membrane Science

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Separation of complex gas mixtures, such as natural gas using polymer membranes, often involves components with a wide range of condensabilities and propensity to interact with the polymer, potentially changing the transport properties of all components. There are few studies of such phenomena in the open literature. Here, the influence of toluene, a surrogate aromatic contaminant in natural gas, on pure and mixed CO 2 and CH 4 gas transport properties at 35 o C was investigated for a thermally rearranged (TR) polymer prepared from a polyimide precursor based on 3,3'-dihydroxy-4,4'-diamino-biphenyl (HAB) and 2,2'-bis-(3,4-dicarboxy-phenyl) hexafluoropropane dianhydride (6FDA). As the polymer was exposed to CO 2 , CH 4 , and their equimolar mixture, at a toluene activity of about 0.3, CO 2 and CH 4 permeability coefficients decreased by more than 90% relative to their respective pre-exposure values due to antiplastization and competitive sorption. CO 2 /CH 4 selectivity went through a maximum as toluene activity increased, reflecting the interplay between competitive sorption, antiplasticization, and plasticization. The recovery of gas permeation properties was explored by measuring CO 2 and CH 4 permeabilities after removing toluene from the feed. These effects were largely reversed when toluene was removed from the feed gas mixture. Toluene vapor sorption was determined as a function of toluene activity, and the sorption data were used to help rationalize the changes in CO 2 and CH 4 gas permeability coefficients in the presence of toluene. A qualitative assessment of antiplasticization and competitive sorption effects was provided using the partial-immobilization dual mode model.

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Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of toluene on CO2 and CH4 gas transport properties in thermally rearranged (TR) polymers based on 3,3′-dihydroxy-4,4′-diamino-biphenyl (HAB) and 2,2′-bis-(3,4-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA)

Liu

Galizia

Gleason

et al. 2016

Journal of Membrane Science

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“…Clearly, properties of polymeric membranes may be affected by contaminants or penetrant induced plasticization [37][38][39][40], etc. This fact notwithstanding, ''aging'' in polymeric membranes generally refers to physical aging in non-equilibrium glassy polymers undergoing physical rearrangements to approach an equilibrium state.…”

Section: Physical Aging In Polymeric Membranesmentioning

confidence: 99%

Physical aging in carbon molecular sieve membranes

Rungta

Hessler

et al. 2014

Carbon

Self Cite

116

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“…The unusual effect of highly sorptive impurities in glassy polymer is well known, higher concentration of these large penetrant molecules may lead to plasticization while lower concentration sometimes may lead to antiplasticization [53][54][55][56][57]. A speculation may thus be that the fairly low concentration of absorbed TEG at 50 1C may have resulted in some antiplasticization.…”

Section: Comparing Permeation Performances Before and After Static Exmentioning

confidence: 99%

Effect of monoethylene glycol and triethylene glycol contamination on CO2/CH4 separation of a facilitated transport membrane for natural gas sweetening

Uddin

Hägg

2012

Journal of Membrane Science

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Toluene impurity effects on CO2 separation using a hollow fiber membrane for natural gas

Cited by 36 publications

References 28 publications

Influence of toluene on CO2 and CH4 gas transport properties in thermally rearranged (TR) polymers based on 3,3′-dihydroxy-4,4′-diamino-biphenyl (HAB) and 2,2′-bis-(3,4-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA)

Influence of toluene on CO2 and CH4 gas transport properties in thermally rearranged (TR) polymers based on 3,3′-dihydroxy-4,4′-diamino-biphenyl (HAB) and 2,2′-bis-(3,4-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA)

Physical aging in carbon molecular sieve membranes

Effect of monoethylene glycol and triethylene glycol contamination on CO2/CH4 separation of a facilitated transport membrane for natural gas sweetening

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