Plasticization of ultra-thin polysulfone membranes by carbon dioxide

Scholes, Colin A.; Chen, George Q.; Stevens, Geoffrey W.; Kentish, Sandra E.

doi:10.1016/j.memsci.2009.09.036

Cited by 122 publications

(74 citation statements)

References 22 publications

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“…Meanwhile, the same authors studied [29] the plasticization of ultra-thin polysulfone membranes by CO 2 . They concluded that the plasticization potential of CO 2 increases with decreasing membrane thickness, correlating with the plasticization pressure behavior.…”

Section: March 2011mentioning

confidence: 99%

Removal of hydrogen sulfide from methane using commercial polyphenylene oxide and Cardo-type polyimide hollow fiber membranes

Chenar

Savoji

Soltanieh

et al. 2011

Korean J. Chem. Eng.

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The performance of commercially available poly (2,6-dimethyl-1,4-phenylene oxide) (PPO) and Cardotype polyimide (PI) hollow fiber membranes was investigated in removing hydrogen sulfide from methane in a series of bench-scale experiments. It was observed that in the concentration range of hydrogen sulfide in methane from 101 to 401 ppm, the methane permeability decreased in the presence of hydrogen sulfide for Cardo-type polyimide hollow fiber membranes, whereas the PPO membrane performance was not affected. The separation coefficients of hydrogen sulfide/methane were 6 and 4 for PI and PPO membranes, respectively. Effects of temperature on the performance of PI and PPO membranes were investigated. It was observed that the permeabilities of both components of the mixture increased by increasing temperature, whereas the selectivities remained constant.

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Section: March 2011mentioning

confidence: 99%

Removal of hydrogen sulfide from methane using commercial polyphenylene oxide and Cardo-type polyimide hollow fiber membranes

Chenar

Savoji

Soltanieh

et al. 2011

Korean J. Chem. Eng.

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“…PIM-1 permeabilities are higher than the majority of the literature [21,26,27]. This difference is attributed to the low feed pressure, meaning the micro-voids are not saturated and hence the CO 2 solubility is greater than that observed for other studies undertaken at higher pressures [28]. The water permeability through PIM-1 is comparable to the author's previous study [7], and demonstrates that PIM-1 has selectivity for water over CO 2 .…”

Section: Single Gas Permeabilitymentioning

confidence: 45%

Water Resistant Composite Membranes for Carbon Dioxide Separation from Methane

Scholes

2018

Applied Sciences

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Abstract:Membranes that are resistant to water vapor permeation have potential in natural gas sweetening by reducing the need for pretreatment. The perfluorinated polymer Teflon AF1600 has proven resistance to water vapor, which is adapted here in the form of composite membranes consisting of a Teflon AF1600 protective layer on membranes of the polyimide 4,4 -(hexafluoroisopropylidene) diphthalic anhydride 2,3,5,6-tetramethyl-1,4-phenylenediamine (6FDA-TMPDA) as well as Polymer of Intrinsic Micro-porosity (PIM-1). The permeability of CO 2 and CH 4 through the composite membranes was shown to be a function of the respective permeabilities of the individual polymer layers, with the Teflon AF1600 layer providing the majority of the resistance to mass transfer. Upon exposure to water, the composite membranes had reduced water permeation of 7-13% compared to pure membranes of 6FDA-TMPDA and PIM-1, because of the water resistance of the Teflon AF1600 layer. It was observed that water permeated as clusters through the composite structure. Under CO 2 -CH 4 mixed gas conditions, 6FDA-TMPDA layer permselectivity performance was reduced and became comparable to Teflon AF1600, while the PIM-1 layer retained much of its high permselectivity performance. Importantly, at water activities below 0.2 the PIM-1 composite membrane achieved higher permeability for CO 2 compared to water.

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“…By definition, plasticization is a pressure dependent phenomenon caused by the dissolution of certain penetrants within the polymer matrix which disrupts the chain packing and enhance inter-segmental mobility of polymer chains [6]. Penetrant -induced plasticization of gas separation membranes by CO 2 have been reported to permanently alters their performances and consequently increases the materials susceptibility to failure [7]. The permeability of condensable gases in glassy polymers decreased with increase in partial pressure of the gases due to the dual mode characteristics, while that of inert gases tend to be constant regardless of the corresponding partial pressure.…”

mentioning

confidence: 99%

“…Plasticization pressure is a parameter that quantitatively describes the maximum feed gas pressure beyond which glassy polymeric membrane can no longer operate profitably. It marks the point beyond which glassy polymer membrane can operate in such a way that selectivity loss becomes a significant issue [7]. Ismail and Lorna [8] have emphasized the need for a correlation between plasticization phenomenon and membrane performance in order to minimize the negative effect of plasticization phenomenon during CO 2 separation from gas mixtures.…”

mentioning

confidence: 99%