Pure - and sour mixed-gas transport properties of 4,4′-methylenebis(2,6-diethylaniline)-based copolyimide membranes

Hayek, Ali; Yahaya, Garba O.; Alsamah, Abdulkarim; Alghannam, Afnan A.; Jutaily, Sulaiman A.; Mokhtari, Ilham

doi:10.1016/j.polymer.2019.01.056

Cited by 21 publications

(20 citation statements)

References 49 publications

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“…Combined acid gas selectivity–permeability trade‐off curve in sour mixed‐gas. 6FDA‐6FpDA/6FDA‐Durene (4:1) block copolyimide is compared to similar polymeric materials reported previously . [Color figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 98%

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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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Section: Resultsmentioning

confidence: 98%

“…6FDA-6FpDA/6FDA-Durene (4:1) block copolyimide is compared to similar polymeric materials reported previously. 24,35,43,47 [Color figure can be viewed at wileyonlinelibrary.com] Figure 17. Combined acid gas selectivity-permeability trade-off curve in sour mixed-gas.…”

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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“…(a) Column chart comparison of sour mixed-gas permeation performance of POz-CF 3 and FPT-Ph(OH) membranes at 700 psi and 22 ° C. (b) Column chart comparison of sweet and sour mixed-gas permeation performance of POz-CF 3 and FPT-Ph(OH) membranes at 500 psi and 22 ° C. (c) Sour mixed-gas plot to compare the H 2 S separation ability of prepared polymeric membranes to some reported membranes performances in the literature: CA, 6FDA-DAM, PIM-6FDA–OH, 6FDA-TPA( t -Bu), TEG-6FDA-DAM:DABA (3:2), 6FDA-Durene/CARDO (1:3), 6FDA-Durene/MDEA (1:3), and 6FDA-6FpDA/6FDA-Durene (4:1) …”

Section: Results and Discussionmentioning

confidence: 99%

“…are limited by their modest performance. Compared to the massive works on CO 2 /CH 4 application, only few studies have aimed at the development of membrane materials for removal of natural sour gas components due to safety concerns and regulations when dealing with the highly toxic H 2 S. − The aforementioned barriers made the literature for H 2 S removal studies extremely stingy and not reflecting the real aggressivity in terms of H 2 S percentage and feed pressure. − …”

Section: Introductionmentioning

confidence: 99%

Unprecedented Sour Mixed-Gas Permeation Properties of Fluorinated Polyazole-Based Membranes

Hayek

Alsamah

Alaslai

et al. 2020

ACS Appl. Polym. Mater.

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A polyoxadiazole polymer POz-CF 3 was prepared, and complete gas permeation properties were investigated on its corresponding membrane using pure-, and multicomponent mixed-gas feeds. The POz-CF 3 membrane demonstrated attractive pureand sweet mixed-gas permeation properties; however, the performance of its membrane declined dramatically during sour mixed-gas testing. The modification of POz-CF 3 into its corresponding polytriazole polymers led to changes in their membranes' mechanical, thermal, processability, and gas permeation properties. For example, the membrane formation of FPT-Ph(NMe 2 ) polytriazole could not be possible due to the polymer low solubility in most solvents. In contrast, the polytriazole FPT-Ph(OH) afforded membranes with improved mechanical properties and enhanced pure-and mixed-gas permeation properties compared to POz-CF 3 membrane. The sour mixed-gas results, in particular, are very attractive and superior to most of the aromatic polymeric membranes tested with similar conditions of gas feed (20 vol % H 2 S) and operational pressure and temperature.

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“…However, the glassy membrane performance can be altered when applied at high acid gas partial pressures. For example, the H 2 S permeance might slightly exceed the CO 2 permeance due to plasticization and sorption site competition [ 41 , 42 , 43 ].…”

Section: Introductionmentioning

confidence: 99%

Superglassy Polymers to Treat Natural Gas by Hybrid Membrane/Amine Processes: Can Fillers Help?

2020

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Superglassy polymers have emerged as potential membrane materials for several gas separation applications, including acid gas removal from natural gas. Despite the superior performance shown at laboratory scale, their use at industrial scale is hampered by their large drop in gas permeability over time due to physical aging. Several strategies are proposed in the literature to prevent loss of performance, the incorporation of fillers being a successful approach. In this work, we provide a comprehensive economic study on the application of superglassy membranes in a hybrid membrane/amine process for natural gas sweetening. The hybrid process is compared with the more traditional stand-alone amine-absorption technique for a range of membrane gas separation properties (CO2 permeance and CO2/CH4 selectivity), and recommendations for long-term membrane performance are made. These recommendations can drive future research on producing mixed matrix membranes (MMMs) of superglassy polymers with anti-aging properties (i.e., target permeance and selectivity is maintained over time), as thin film nanocomposite membranes (TFNs). For the selected natural gas composition of 28% of acid gas content (8% CO2 and 20% H2S), we have found that a CO2 permeance of 200 GPU and a CO2/CH4 selectivity of 16 is an optimal target.

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Pure - and sour mixed-gas transport properties of 4,4′-methylenebis(2,6-diethylaniline)-based copolyimide membranes

Cited by 21 publications

References 49 publications

Fluorinated copolyimide membranes for sour mixed‐gas upgrading

Fluorinated copolyimide membranes for sour mixed‐gas upgrading

Unprecedented Sour Mixed-Gas Permeation Properties of Fluorinated Polyazole-Based Membranes

Superglassy Polymers to Treat Natural Gas by Hybrid Membrane/Amine Processes: Can Fillers Help?

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