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/anie.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 (International Edition)

DOI:https://doi.org/10.1002/anie.202006521· OSTI ID:1786174

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:: 1786174

Alternate ID(s):: OSTI ID: 1849496

Journal Information:: Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 46 Vol. 59; ISSN 1433-7851

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

Country of Publication:: Germany

Language:: English

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