期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 34, 页码 11700-11703出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201904913
关键词
carbon molecular-sieve membranes; gas separation; hollow fiber; hydrocarbon; hydrogen; ethylene separation
资金
- Dow Chemical Company
- U. S. Department of Energy [DE-FG02-04ER15510]
- U.S. Department of Energy (DOE) [DE-FG02-04ER15510] Funding Source: U.S. Department of Energy (DOE)
This study reports 6FDA:BPDA-DAM polyimide-derived hollow fiber carbon molecular-sieve (CMS) membranes for hydrogen and ethylene separation. Since H-2/C2H4 selectivity is the lowest among H-2/(C-1-C-3) hydrocarbons, an optimized CMS fiber for this gas pair is useful for removing hydrogen from all-cracked gas mixtures. A process we term hyperaging provides highly selective CMS fiber membranes by tuning CMS ultramicropores to favor H-2 over larger molecules to give a H-2/C2H4 selectivity of over 250. Hyperaging conditions and a hyperaging mechanism are discussed in terms of an expedited physical aging process, which is largely controlled by the hyperaging temperature. For the specific CMS material considered here, a hyperaging temperature beyond 90 degrees C but less than 250 degrees C works best. Hyperaging also stabilizes CMS materials against physical aging and stabilizes the performance of H-2 separation over extended periods. This work opens a door in the development of CMS materials for the separation of small molecules from large molecules.
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