Sour mixed-gas upper bounds of glassy polymeric membranes

Hayek, Ali; Shalabi, Yasser A.; Alsamah, Abdulkarim

doi:10.1016/j.seppur.2021.119535

Cited by 16 publications

(30 citation statements)

References 72 publications

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“…Finally, the performance of the poly(imide–oxadiazole) membranes in this work were plotted against the 2021 sweet mixed-gas CO 2 permeability–CO 2 /CH 4 selectivity upper bound including previously published data from our laboratory and other data reported in the literature . The outcome of this comparison is illustrated in Figure c.…”

Section: Resultsmentioning

confidence: 99%

“…Comparison between the sweet mixed-gas separation properties of poly(imide–oxadiazole)s containing (a) Durene:oxadiazol = 1:1, (b) Durene:oxadiazol = 3:1, and (c) CO 2 permeability–CO 2 /CH 4 selectivity relationship chart depicting the sweet mixed-gas permeation performance of poly(imide–oxadiazole) membranes compared to those of previously reported materials. Literature data and upper bound ref .…”

Section: Resultsmentioning

confidence: 99%

“…Finally, the performance of the poly(imide−oxadiazole) membranes in this work were plotted against the 2021 sweet mixed-gas CO 2 permeability−CO 2 /CH 4 selectivity upper bound including previously published data from our laboratory and other data reported in the literature. 82 The outcome of this comparison is illustrated in Figure 10c. The comparison shows that the poly(imide−oxadiazole) membranes are among the highest performing membranes reported, with high potential for use in industrial natural gas separation applications.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Molecular Design of Poly(imide–oxadiazole) Membranes for High-Pressure Mixed-Gas Separation

et al. 2022

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The design of new polymeric materials and the search for new classes of polymers for industrial application in membrane-based gas separation have been the focus of several research groups worldwide. Membranes with high productivity and efficiency under harsh operational conditions of pressure and temperature during mixed-gas separation are of great interest. In this paper, we report the preparation of a series of block copolymers of poly(imide−oxadiazole)s built from 6FDA, Durene, and four different 1,3,4-oxadiazole-based monomers. The pureand mixed-gas separation properties of their corresponding membranes were measured. The mixed-gas separation data were collected at a high feed pressure of up to 900 psi. Such mixed-gas separation testing under harsh conditions is required to subject the membranes to environments similar to industrial use. For example, the mixed-gas CO 2 permeability of 6FDA-Durene/6FDA-4BAO(Me) (3:1) was measured at 900 psi to be ∼130 barrer, and the CO 2 /CH 4 selectivity is around ∼24. These results of permeability and selectivity of poly(imide−oxadiazole) membranes at such high gas feed pressure are considered very attractive and are superior to many glassy polymers reported in the literature and that are industrially observed membranes. This work illustrates well a case scenario of structure−property relationship and demonstrates the exclusivity of mixed-gas testing which could not be predicted from the ideal situation of pure-gas testing. In the near future, the mixed-gas separation properties of thin layer composite and hollow fibers will be evaluated.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

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Molecular Design of Poly(imide–oxadiazole) Membranes for High-Pressure Mixed-Gas Separation

et al. 2022

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“…It is worthy to mention that, in all cases, the mixed-gas CO 2 /CH 4 selectivity coefficients were observed to be higher than the ideal CO 2 /CH 4 selectivities because of the increment in the CO 2 /CH 4 mixed-gas solubility−selectivity due to the competitive sorption between the different gas components. 62,63 To illustrate the important results obtained in this work, the sweet mixed-gas performance of the modified copolyimide membranes was plotted on the 2021 sweet mixed-gas upper bound 64 and compared to similar glassy polymeric membranes reported previously (Figure 5c). The overall performance of these membranes in considered very attractive, especially at such harsh testing conditions (quaternary gas mixture and high feed pressure), which indicates the advantageous potential of using these membranes in industrial applications for natural gas upgrading.…”

Section: Sweet Mixed-gas Separation Propertiesmentioning

confidence: 72%

“…[58][59][60][61]68,69 Finally, the sour mixed-gas separation performance of the PI-1 and MPI-1 membranes was plotted on the H 2 S/CH 4 and CO 2 /CH 4 permeability−selectivity plots and compared to the 2021 sour mixed-gas H 2 S/CH 4 and CO 2 /CH 4 upper bounds of similar glassy polymeric membranes reported previously in literature (Figure 6d,e). 64 It is worth mentioning that most data in the literature are for membranes studied using ternary gas mixtures (H 2 S/CO 2 /CH 4 ), while the performance of the PI-1 and MPI-1 membranes were measured using a quinary gas mixture (H 2 S/CO 2 /CH 4 /N 2 /C 2 H 6 ), which renders the separation more complex.…”

Section: Sweet Mixed-gas Separation Propertiesmentioning

confidence: 99%

Modified CARDO-Based Copolyimides with Improved Sour Mixed-Gas Permeation Properties

Hayek

Alsamah

Saleem

et al. 2022

ACS Appl. Polym. Mater.

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Chemical modification is an interesting tool to introduce functional groups into polymers’ backbones to tailor their properties in a desired fashion. Polymers used in membrane-based gas separation applications need to possess high gas permeability and selectivity during mixed-gas separation under harsh operational conditions of pressure and temperature. Herein, we report the modification of three copolyimides containing the moiety 9,9-bis(4-aminophenyl)fluorine (CARDO) through Friedel–Crafts alkylation to introduce bulky tert-butyl groups into their backbones. Membranes prepared from the modified polymers were evaluated using pure- and sweet mixed-gas under aggressive feed pressures. Based on the promising results obtained, a selected copolyimide was subjected to sour mixed-gas separation under feed pressures up to 500 psi. Mixed-gas separation studies, especially those containing hydrogen sulfide, are of great interest to develop membranes for use in sour natural gas reserve treatment. For example, the H2S and CO2 permeability coefficients of 6FDA-Durene/6FDA-CARDO(t-Bu) at 500 psi were recorded as 456 and 238 Barrer, respectively, where the H2S/CH4 and CO2/CH4 are 20.4 and 10.6, respectively. The obtained results are very promising and even superior to many glassy polymers reported previously. This work represents an example of the benefit of chemical modification on polymers to tailor their structure–property relationship. Future works will be focused on the fabrication and testing of asymmetric or composite hollow fibers to imitate the membrane modules used industrially.

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Copolyimide asymmetric hollow fiber membranes for high‐pressure natural gas purification

Shalabi

Yahaya

Choi

et al. 2023

J of Applied Polymer Sci

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The current process to purify contaminated natural gas reserves employs a highly energy-intensive amine scrubbing technology. To satisfy the growing demand for natural gas coupled with the tight regulations on CO 2 emissions, researchers worldwide are investigating the use of polymeric membranes for acid gas removal from natural gas streams, to reduce the energy consumption and carbon emission of the nowadays used technology. Placing a polymeric membrane unit at the upstream of the amine scrubbing column reduces the energy consumption during the regeneration process of saturated amines. Hence, the preparation of polymeric membranes in form of hollow fibers is a key step towards their industrial implementation for natural gas processing.The following study demonstrates the potential separation performance of 6FDA-Durene/6FDA-CARDO (5000:5000) in an integrally skinned defect-free asymmetric hollow fiber geometry. The initial screening studies of the membrane shows good pure-gas performance as it exhibits CO 2 /CH 4 selectivity coefficients around 28 and CO 2 permeance between 310 and 350 GPU. Feed pressures of up to 900 psig and stage cuts ranging from 5% to 20% were tested for a quaternary sweet mixed-gas feed to assess the membrane performance under operating conditions that mimic those in industrial settings. Mixed-gas permeance of all gases, and CO 2 /CH 4 selectivity remain somewhat constant as the feed pressure increases up to 900 psig. Both mixed-gas CO 2 permeance and CO 2 /CH 4 selectivity decline as the stage cut increases. As expected, as CO 2 recovery is maximized, CO 2 purity is minimized and CH 4 loss increases with increasing stage cut. As a result of the trade-off between recovery and purity, the data and analyses reported herein can provide insights into the limitations that certain operating parameters can pose on CO 2 separation performance with similar polymeric hollow fiber membranes.

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Sour mixed-gas upper bounds of glassy polymeric membranes

Cited by 16 publications

References 72 publications

Molecular Design of Poly(imide–oxadiazole) Membranes for High-Pressure Mixed-Gas Separation

Molecular Design of Poly(imide–oxadiazole) Membranes for High-Pressure Mixed-Gas Separation

Modified CARDO-Based Copolyimides with Improved Sour Mixed-Gas Permeation Properties

Copolyimide asymmetric hollow fiber membranes for high‐pressure natural gas purification

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