A Self‐Consistent Model for Sorption and Transport in Polyimide‐Derived Carbon Molecular Sieve Gas Separation Membranes

Sanyal, Oishi; Hays, Samuel S.; León, Nicholas E.; Guta, Yoseph A.; Itta, Arun K.; Lively, Ryan P.; Koros, William J.

doi:10.1002/ange.202006521

A Self‐Consistent Model for Sorption and Transport in Polyimide‐Derived Carbon Molecular Sieve Gas Separation Membranes

Journal Article · Wed Sep 02 00:00:00 EDT 2020 · Angewandte Chemie

DOI:https://doi.org/10.1002/ange.202006521· OSTI ID:1657621

Sanyal, Oishi ^[1]; Hays, Samuel S. ^[1]; León, Nicholas E. ^[1]; Guta, Yoseph A. ^[1]; Itta, Arun K. ^[1]; Lively, Ryan P. ^[1]; ^[1]

School of Chemical and Biomolecular Engineering Georgia Institute of Technology 311 Ferst Drive NW Atlanta GA 30332 USA

Abstract

Demand for energy‐efficient gas separations exists across many industrial processes, and membranes can aid in meeting this demand. Carbon molecular sieve (CMS) membranes show exceptional separation performance and scalable processing attributes attractive for important, similar‐sized gas pairs. Herein, we outline a mathematical and physical framework to understand these attributes. This framework shares features with dual‐mode transport theory for glassy polymers; however, physical connections to CMS model parameters differ from glassy polymer cases. We present evidence in CMS membranes for a large volume fraction of microporous domains characterized by Langmuir sorption in local equilibrium with a minority continuous phase described by Henry's law sorption. Using this framework, expressions are provided to relate measurable parameters for sorption and transport in CMS materials. We also outline a mechanism for formation of these environments and suggest future model refinements.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

OSTI ID:: 1657621

Journal Information:: Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 46 Vol. 132; ISSN 0044-8249

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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