High pressure pure- and mixed sour gas transport properties of Cardo-type block co-polyimide membranes

Alghannam, Afnan A.; Yahaya, Garba O.; Hayek, Ali; Mokhtari, Ilham; Saleem, Qasim; Sewdan, Donya A.; Bahamdan, Ahmad A.

doi:10.1016/j.memsci.2018.02.042

Cited by 34 publications

(47 citation statements)

References 48 publications

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“…These permeation results are in line with the FFV values reported in Table II. Based on our previous studies, we found that block copolyimides performed better in gas separation than their random counterparts. 24,35 This observation is confirmed again based on the permeation data of block and random copolyimides with similar a The homopolymers 6FDA-Durene and 6FDA-6FpDA were reproduced and tested using our gas permeation system for accuracy purposes. 1 barrer = 10 −10 cm 3 (STP) cm cm −2 s cmHg.…”

Section: Thermal and Physical Propertiessupporting

confidence: 70%

“…The figures include data from the sour mixed-gas permeation results obtained for our previously reported random and block 6FDA-Durene/CARDO copolyimides. 24,35 The performance of our membrane is within the range of some of the high-performance polymeric materials reported, keeping in mind that the available reported data represent some variation on the upstream pressure (146-700 psi) and the sour gas mixtures used such as the H 2 S-content (12.5--20 vol. %) and the absence of N 2 and heavier hydrocarbon C 2 H 6 .…”

Section: Thermal and Physical Propertiessupporting

confidence: 56%

“…The pure-gas permeation data of dense films prepared from the five copolyimides using He, N 2 , CH 4 , and CO 2 were measured using a constant volume/variable pressure permeation system described along with the theory and background in our previous publications. 24,35 The permeability coefficients were calculated using the steady state of the pressure variation versus time at the permeate side. The upstream pressure was fixed to 100 psi and the system was kept at a temperature of 22 C. The permeation data are depicted in Table III and the CO 2 /CH 4 selectivity coefficients were plotted versus their corresponding CO 2 permeability coefficients in Figure 7.…”

Section: Thermal and Physical Propertiesmentioning

confidence: 99%

“…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%

“…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%

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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: Thermal and Physical Propertiessupporting

confidence: 70%

Section: Thermal and Physical Propertiessupporting

confidence: 56%

Section: Thermal and Physical Propertiesmentioning

confidence: 99%

Section: Thermal and Physical Propertiesmentioning

confidence: 99%

Section: Thermal and Physical Propertiesmentioning

confidence: 99%

See 3 more Smart Citations

Fluorinated copolyimide membranes for sour mixed‐gas upgrading

Hayek

Yahaya

Alsamah

et al. 2019

J of Applied Polymer Sci

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Molecularly Engineered 6FDA‐Based Polyimide Membranes for Sour Natural Gas Separation

Liu

Qiu

et al. 2020

Angewandte Chemie

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Glassy polyimide membranes are attractive for industrial applications in sour natural gas purification. Unfortunately, the lack of fundamental understanding of relationships between polyimide chemical structures and their gas transport properties in the presence of H2S constrains the design and engineering of advanced membranes for such challenging applications. Herein, 6FDA‐based polyimide membranes with engineered structures were synthesized to tune their CO2/CH4 and H2S/CH4 separation performances and plasticization properties. Under ternary mixed sour gas feeds, controlling polymer chain packing and plasticization tendency of such polyimide membranes via tuning the chemical structures were found to offer better combined H2S and CO2 removal efficiency compared to conventional polymers. Fundamental insights into structure–property relationships of 6FDA‐based polyimide membranes observed in this study offer guidance for next generation membranes for sour natural gas separation.

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