Aromatic block co-polyimide membranes for sour gas feed separations

Yahaya, Garba O.; Qahtani, Mohammad S.; Ammar, Abdulaziz Y.; Bahamdan, Ahmad A.; Ameen, Ahmed W.; Alhajry, Rashed H.; Sultan, Melhan M. Ben; Hamad, F.

doi:10.1016/j.cej.2016.06.076

Cited by 48 publications

(25 citation statements)

References 24 publications

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“…At the high end of the mixed-gas feed pressure range (77 bar), the H 2 S/CH 4 selectivity reached nearly 75 in the freshly cast AO-PIM-1 film. This remarkable selectivity exceeds that of all glassy polymers and even the most selective rubbery polymers ( 5 , 7 – 9 , 12 , 18 , 19 , 27 ). Moreover, the AO-PIM-1 ultrahigh H 2 S permeability of ~4300 Barrer under the extremely aggressive feed pressures up to 77 bar makes it a breakthrough material, with an extraordinary combination of ultrahigh selectivity and permeability.…”

Section: Resultsmentioning

confidence: 86%

“…Experimental upper bound lines are drawn to guide the eye: the solid black ones reveal the trade-off between H 2 S or combined acid gas (CO 2 + H 2 S) permeabilities and selectivities in typical glassy polymers; the dashed black ones show the case of hydrophilic rubbery membranes. AO-PIM-1 films (this work) were measured with ternary sour gas mixtures containing H 2 S as high as 20 mol % at exceedingly aggressive feed pressures higher than 55 bar and up to 77 bar; typical rubbery materials were tested at low feed pressures of ~10 bar; mixed-matrix membranes were measured at 6.9 bar ( 36 , 37 ); typical glassy polymers including cellulose acetate, 6FDA-based polyimides, cross-linkable polyimides (PEGMC), fluorinated PAIs (6F-PAIs), and intrinsically microporous polyimides (PIM-6FDA-OH) were measured with ternary gas mixtures containing H 2 S ranging from 10 to 20 mol % at aggressive feed pressures of greater than 34.5 bar but generally less than 60 bar ( 5 , 7 – 9 , 12 , 18 , 19 , 27 ).…”

Section: Resultsmentioning

confidence: 99%

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Ultraselective glassy polymer membranes with unprecedented performance for energy-efficient sour gas separation

et al. 2019

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Membrane-based separation of combined acid gases carbon dioxide and hydrogen sulfide from natural gas streams has attracted increasing academic and commercial interest. These feeds are referred to as “sour,” and herein, we report an ultra H2S-selective and exceptionally permeable glassy amidoxime-functionalized polymer of intrinsic microporosity for membrane-based separation. A ternary feed mixture (with 20% H2S:20% CO2:60% CH4) was used to demonstrate that a glassy amidoxime-functionalized membrane provides unprecedented separation performance under challenging feed pressures up to 77 bar. These membranes show extraordinary H2S/CH4 selectivity up to 75 with ultrahigh H2S permeability >4000 Barrers, two to three orders of magnitude higher than commercially available glassy polymeric membranes. We demonstrate that the postsynthesis functionalization of hyper-rigid polymers with appropriate functional polar groups provides a unique design strategy for achieving ultraselective and highly permeable membrane materials for practical natural gas sweetening and additional challenging gas pair separations.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Ultraselective glassy polymer membranes with unprecedented performance for energy-efficient sour gas separation

et al. 2019

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“…The prepared copolyimides are compared to similar polymeric materials reported previously. [35][36][37][38][39][40][41][42][43][44] [Color figure can be viewed at wileyonlinelibrary.com] of gas permeability (P) can be calculated from the Arrhenius equation:…”

Section: Thermal and Physical Propertiesmentioning

confidence: 99%

Fluorinated copolyimide membranes for sour mixed‐gas upgrading

Hayek

Yahaya

Alsamah

et al. 2019

J of Applied Polymer Sci

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Three random and two block 4,4 0 -(hexafluoroisopropylidene)diphthalic anhydride (6FDA)-based copolyimides with different 6FpDA:Durene molar ratio varying from 25 to 80% were prepared and characterized. The pure-gas permeation data of their membranes were investigated at 100 psi and 22 C. The CO 2 /CH 4 ideal selectivity coefficient increased to around 47 with the increase of the 6FpDA content to 80% in the copolymer backbone while the CO 2 permeability coefficient found to be the highest (378 barrer) with highest Durene content copolymer. Based on its attractive pure-gas permeation properties(CO 2 /CH 4 = 47), 6FDA-6FpDA/6FDA-Durene (4:1) block copolyimide was selected for further analyses, where the effect of pressure and temperature on its gas transport properties was evaluated. Furthermore, the mixed-gas permeation properties were investigated using multicomponent sweet and sour gas mixtures prepared from N 2 (30% or 10%), CH 4 (59%), C 2 H 6 (1%), CO 2 (10%), and H 2 S (0% or 20%)accordingly. The sweet mixed-gas CO 2 /CH 4 selectivity and CO 2 permeability coefficients of 6FDA-6FpDA/6FDA-Durene (4:1) are around 39 and 45 barrer, respectively, at elevated pressure (800 psi). The polymer, however, showed nonideal behavior when subjected to high H 2 S-content gas mixture (20 vol. % H 2 S), where the CO 2 /CH 4 selectivity value dropped to around 21 and the H 2 S/CH 4 selectivity coefficient is 13. The CO 2 and H 2 S permeability coefficients are 42 and 26 barrer, respectively, at an upstream pressure up to 500 psi. When plotted on the combined acid gas permeability-selectivity curve, the polymer separation efficiency was nearby the high-performing polymers reported in the literature, and way superior to the industrial standard glassy polymer, cellulose acetate, used currently in gas separation.

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“…From Figure , it can be seen that the T g of prepared copolyimide (PI‐1) is about 159.8 °C. Comparing with other homopolyimides, its glass transition temperature is rather lower . It just meets our experimental requirement that the range of the glass transition temperature of two components in a IPNs system is approximately 100 °C.…”

Section: Resultsmentioning

confidence: 70%

Damping, thermal, and mechanical performances of a novel semi‐interpenetrating polymer networks based on polyimide/epoxy

Yang

et al. 2019

J of Applied Polymer Sci

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In this article, a series of novel semi-interpenetrating polymer networks (s-IPNs) based on linear polyimide (PI) and crosslinked epoxy (EP) were firstly prepared aiming at controlling violent vibration and noise originating from operation of the machine. The damping, thermal, and mechanical performances of s-IPNs films were systematically investigated in terms of the structure of polyimide (the molar ratios of diamines) and the component ratios of PI/EP. The results indicate that PI/EP s-IPNs films exhibit prominent damping properties, and the effective damping temperature range can reach up to 58.8 C when molar ratio of diamines is 1:3 within PI and component ratio of PI/EP is 70:30. Meanwhile, all the PI/EP s-IPNs films show good thermal stability compared to cured EP and certain mechanical behaviors due to the formation of semi-interpenetrated structure. Meaningfully, the prepared novel PI/EP s-IPNs will be used as effective damping materials and have a potential application in damping fields.

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Aromatic block co-polyimide membranes for sour gas feed separations

Cited by 48 publications

References 24 publications

Ultraselective glassy polymer membranes with unprecedented performance for energy-efficient sour gas separation

Ultraselective glassy polymer membranes with unprecedented performance for energy-efficient sour gas separation

Fluorinated copolyimide membranes for sour mixed‐gas upgrading

Damping, thermal, and mechanical performances of a novel semi‐interpenetrating polymer networks based on polyimide/epoxy

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