Properties of a polyimide gas separation membrane in natural gas streams

White, Lloyd S.; Blinka, Thomas A.; Kloczewski, Harold A.; Wang, I-fan

doi:10.1016/0376-7388(94)00313-n

Cited by 150 publications

(128 citation statements)

References 17 publications

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“…Over the past three decades, aromatic polyimides have been extensively investigated as potential membrane materials for natural gas separation [6,8,[12][13][14][15]. However, many polyimides have similar limitations in their practical use as cellulose acetate because of CO 2 -induced plasticization, which often results in unacceptable loss in CO 2 /CH 4 selectivity [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Pure- and mixed-gas permeation properties of highly selective and plasticization resistant hydroxyl-diamine-based 6FDA polyimides for CO2/CH4 separation

Alaslai

Ghanem

Alghunaimi

et al. 2016

Journal of Membrane Science

113

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The effect of hydroxyl functionalization on the m-phenylene diamine moiety of 6FDA dianhydride-based polyimides was investigated for gas separation applications. Pure-gas permeability coefficients of He, H 2 , N 2 , O 2 , CH 4 , and CO 2 were measured at 35 °C and 2 atm.The introduction of hydroxyl groups in the diamine moiety of 6FDA-diaminophenol (DAP) and 6FDA-diamino resorcinol (DAR) polyimides tightened the overall polymer structure due to increased charge transfer complex formation compared to unfunctionalized 6FDA-m-phenylene diamine (mPDA). The BET surface areas based on nitrogen adsorption of 6FDA-DAP (54 m 2 g -1 )and of 6FDA-DAR (45 m 2 g -1 ) were ~18% and 32% lower than that of 6FDA-mPDA (66 m 2 g -1 ).6FDA-mPDA had a pure-gas CO 2 permeability of 14 Barrer and CO 2 /CH 4 selectivity of 70. The hydroxyl-functionalized polyimides 6FDA-DAP and 6FDA-DAR exhibited very high pure-gas CO 2 /CH 4 selectivities of 92 and 94 with moderate CO 2 permeability of 11 and 8 Barrer, respectively. It was demonstrated that hydroxyl-containing polyimide membranes maintained very high CO 2 /CH 4 selectivity (~ 75 at CO 2 partial pressure of 10 atm) due to CO 2 plasticization resistance when tested under high-pressure mixed-gas conditions. Functionalization with hydroxyl groups may thus be a promising strategy towards attaining highly selective polyimides for economical membrane-based natural gas sweetening.

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Section: Introductionmentioning

confidence: 99%

Pure- and mixed-gas permeation properties of highly selective and plasticization resistant hydroxyl-diamine-based 6FDA polyimides for CO2/CH4 separation

Alaslai

Ghanem

Alghunaimi

et al. 2016

Journal of Membrane Science

113

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“…membrane plasticization often leads to highly undesirable loss in mixed-gas selectivity. 4,7,8,[9][10][11][12][13] An emerging materials class that can potentially mitigate some limitations of commercial gas separation membranes is based on perfluorinated solution-processable glassy polymers, (Asahi Glass) and others. [14][15][16][17][18][19] These polymers are known for their excellent chemical and thermal properties as a result of their strong C-F bond energy (485 kJ/mole) in comparison to C-C (360 kJ/mole) bonds in hydrocarbon polymers.…”

Section: Introductionmentioning

confidence: 99%

Gas Sorption, Diffusion, and Permeation in Nafion

2015

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The gas permeability of dry Nafion ® films was determined at 2 atm and 35 °C for He, H 2 , N 2 , O 2 , CO 2 , CH 4 , C 2 H 6 and C 3 H 8 . In addition, gas sorption isotherms were determined by gravimetric and barometric techniques as a function of pressure up to 20 atm. Nafion Barrer, respectively; all other gases exhibited low permeability that decreased significantly as penetrant size increased. Dry Nafion ® was characterized by extraordinarily high selectivities:He/H 2 = 5.2, He/CH 4 = 445, He/C 2 H 6 = 1275, He/C 3 H 8 = 7400, CO 2 /CH 4 = 28, CO 2 /C 2 H 6 = 79,

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“…At present, few methods of CO 2 separation from CH 4 and recovery are available. There are absorption (including chemical absorption and physical absorption), adsorption, membrane separation and cryogenic separation [3].…”

Section: Methods Of Separationmentioning

confidence: 99%

“…Among the most widely used and researched are Polyethersulfone (PES) and Polyimide (PI) membrane. PI membranes have been recognized as membranes with high selectivity for CO 2 /CH 4 particularly PI membrane with a hexafluoro substituted carbon [4].…”

Section: Methods Of Separationmentioning

confidence: 99%