Fine-tuned thermally cross-linkable 6FDA-based polyimide membranes for aggressive natural gas separation

Liu, Zhongyun; Qiu, Wulin; Quan, Wenying; Liu, Yang; Koros, William J.

doi:10.1016/j.memsci.2021.119474

Fine-tuned thermally cross-linkable 6FDA-based polyimide membranes for aggressive natural gas separation

Journal Article · Tue Jun 01 00:00:00 EDT 2021 · Journal of Membrane Science

DOI:https://doi.org/10.1016/j.memsci.2021.119474· OSTI ID:1977433

Liu, Zhongyun ^[1]; Qiu, Wulin ^[1]; Quan, Wenying ^[1]; ^[1]; Koros, William J. ^[1]

Georgia Institute of Technology, Atlanta, GA (United States)

Glassy 6FDA-based polyimides are attractive membrane materials for many industrially important gas separations; however, plasticization in aggressive natural gas often causes significant loss in CO₂/CH₄ selectivity. In this study, a family of thermally cross-linkable 6FDA-based polyimides containing carboxyl groups were synthesized and cross-linked as dense films via decarboxylation-induced thermal crosslinking. As well as chemical structure, crosslinking temperatures above and below T_g are shown to be synergistic tools. Our results demonstrate that structure evolution during the decarboxylation-induced crosslinking process is affected significantly by the 3,5-diaminobenzoic acid (DABA) content in the polymer backbone. Even for a 50/50 CO₂/CH₄ binary mixture with feed pressure up to 800 psia, decarboxylation-induced crosslinking provides attractive gas separation performance and plasticization resistance. Combined facile structure tunability, crosslinkability and high asymmetric fiber spinnability make the cross-linkable 6FDA-based polyimides a versatile platform for diverse aggressive natural gas feeds encountered in practice. Finally, our study provides insights into material design of thermally cross-linkable polymer membranes for such a broad spectrum of aggressive gas separations.

View Accepted Manuscript (DOE)

Research Organization:: Georgia Institute of Technology, Atlanta, GA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-04ER15510

OSTI ID:: 1977433

Alternate ID(s):: OSTI ID: 1786577

Journal Information:: Journal of Membrane Science, Journal Name: Journal of Membrane Science Vol. 635; ISSN 0376-7388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Aggressive gas separation
Decarboxylation
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Polyimide membrane
Thermal cross-linking

Fine-tuned thermally cross-linkable 6FDA-based polyimide membranes for aggressive natural gas separation

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References (51)

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