Appealing sheath‐core spun high‐performance composite carbon molecular sieve membranes

Cao, Yuhe; Liu, Zhongyun; Qiu, Wulin; Koros, William J.

doi:10.1002/ange.202303915

Title: Appealing sheath‐core spun high‐performance composite carbon molecular sieve membranes

Journal Article · 24 May 2023 · Angewandte Chemie

DOI: https://doi.org/10.1002/ange.202303915 · OSTI ID:1983365

Cao, Yuhe ^[1]; Liu, Zhongyun ^[1]; Qiu, Wulin ^[1];

^[1]

School of Chemical &, Biomolecular Engineering Georgia Institute of Technology 311 Ferst Dr. NW Atlanta GA 30332 USA

Abstract Carbon molecular sieve (CMS) membranes are attractive candidates to meet requirements for challenging gas separations. The added ability to maintain such intrinsic properties in an asymmetric morphology with a structure that we term a “Pseudo Wheel+Hub & Spoke” asymmetric form offers new opportunities. For CMS membrane, specifically, the structure provides both selective layer support and low flow resistance even for high feed pressures and fluxes in CO ₂ removal from natural gas. This capability is unavailable to even rigid glassy polymers due to the much higher modulus of CMS materials. Combining precursor asymmetric hollow fiber formation and optimized pyrolysis creates a defect free CMS proof‐of‐concept membrane for this application. Facile formation of the sheath‐core spun precursor with a 6FDA‐DAM sheath and Matrimid® core also avoids the need to seal defects before or after the carbonization of the precursors. The composite CMS membrane shows CO ₂ /CH ₄ (50 : 50) mixed gas feed with an attractive CO ₂ /CH ₄ selectivity of 64.3 and CO ₂ permeance of 232 GPU at 35 °C. A key additional benefit of the approach is reduction in use of the more costly high performance 6FDA‐DAM in a composite sheath‐core CMS membrane with the “Pseudo Wheel+Hub & Spoke” structure.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-04ER15510

OSTI ID:: 1983365

Journal Information:: Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 27 Vol. 135; ISSN 0044-8249

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

Country of Publication:: Germany

Language:: English

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