Synthesis and gas separation performance of intrinsically microporous polyimides derived from sterically hindered binaphthalenetetracarboxylic dianhydride

Intrinsically microporous polyimides with high gas permeability and favorable selectivity were prepared from a bulky, rigid, and sterically hindered dianhydride, 3,3′-di-t-butyl-2,2′-dimethoxy-[1,1′-binaphthalene]-6,6′,7,7′,-tetracarboxylic dianhydride.

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Carboxylated Carbon Nanotubes/Polyethersulfone Hollow Fiber Mixed Matrix Membranes: Development and Characterization for Enhanced Gas Separation Performance

MRS Advances ◽

10.1557/adv.2018.411 ◽

2018 ◽

Vol 3 (52) ◽

pp. 3103-3109 ◽

Cited By ~ 8

Author(s):

Akshay Modi ◽

Surendra Kumar Verma ◽

Jayesh Bellare

Keyword(s):

Carbon Nanotubes ◽

Gas Separation ◽

Hollow Fiber ◽

Upper Bound ◽

Gas Permeability ◽

Ideal Gas ◽

Separation Performance ◽

Gas Selectivity ◽

Carboxylated Carbon Nanotubes ◽

Gas Separation Performance

ABSTRACTCarboxylated carbon nanotubes (C or cCNTs) were incorporated in polyethersulfone hollow fiber membranes (P HFMs) to improve the gas separation performance, i.e., pure gas permeability and ideal gas selectivity. The developed CP HFMs showed the remarkable improvement in thermal stability and mechanical strength as compared to that of the pristine P HFMs. The pure gas permeability of CO2, CH4, O2, and N2 gases for the HFMs were measured at 3 bar feed pressure and room temperature. It was observed that the presence of cCNTs in HFMs significantly improved the CO2 and O2 permeability for CP HFMs by 10.8-and 11.7- fold, respectively, as compared to that measured for P HFMs. Furthermore, the ideal gas selectivity for CO2/CH4, O2/N2, and CO2/N2 gas pairs for CP HFMs was also remarkably enhanced by almost 8.6-, 10.7-and 9.9-times, respectively, as compared to that measured for P HFMs. CP HFMs exhibited gas separation performance better than or comparable to that of the literature-reported CNTs-based membranes. Remarkably, the gas separation performance of CP HFMs crossed Robeson’s 2008 upper bound curve for O2/N2 gas-pair and was almost closer to the upper bound curves drawn by Robeson in 2008 for CO2/CH4 and CO2/N2 gas pairs. The improved separation performance can be attributed to the presence of cCNTs in HFMs. Thus, the results obtained in this study clearly showed that the CP HFMs can potentially be used as a membrane material for the industrially relevant gas separations.

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Hyperaging Tuning of a Carbon Molecular‐Sieve Hollow Fiber Membrane with Extraordinary Gas‐Separation Performance and Stability

Angewandte Chemie International Edition ◽

10.1002/anie.201904913 ◽

2019 ◽

Vol 58 (34) ◽

pp. 11700-11703 ◽

Cited By ~ 9

Author(s):

Wulin Qiu ◽

Justin Vaughn ◽

Gongping Liu ◽

Liren Xu ◽

Mark Brayden ◽

...

Keyword(s):

Gas Separation ◽

Hollow Fiber ◽

Molecular Sieve ◽

Hollow Fiber Membrane ◽

Separation Performance ◽

Fiber Membrane ◽

Carbon Molecular Sieve ◽

Gas Separation Performance

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The spirobichroman-based polyimides with different side groups: from structure–property relationships to chain packing and gas transport performance

RSC Advances ◽

10.1039/d0ra10113c ◽

2021 ◽

Vol 11 (9) ◽

pp. 5086-5095

Author(s):

Shuli Wang ◽

Xiaohua Tong ◽

Chunbo Wang ◽

Xiaocui Han ◽

Sizhuo Jin ◽

...

Keyword(s):

Dihedral Angle ◽

Gas Separation ◽

Gas Transport ◽

Critical Role ◽

Polymer Membranes ◽

Separation Performance ◽

Structure Property ◽

Chain Packing ◽

Structure Property Relationships ◽

Gas Separation Performance

Effect of substituents on the dihedral angle and chain packing plays a critical role in the enhancement in the gas separation performance of polymer membranes.

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