Carbon molecular sieving membranes derived from condensed polynuclear aromatic (COPNA) resins for gas separations
- Kyushu Univ., Fukuoka (Japan)
Condensed polynuclear aromatic (COPNA) compounds were synthesized from pyrene, phenanthrene, and 1,4-benzenedimethanol. Each COPNA compound was dissolved in tetrahydrofuran, and the solution was used as a coating on the outer surface of a porous {alpha}-alumina support tube. The resulting green films were carbonized at 400--1,000 C. The permeances of the COPNA-based carbon membranes were largest for a carbonization temperature of 600 C, where the mesopore structure was most developed. This optimum carbonization temperature was 50--100 C lower than that found for polyimide films synthesized from 3,3{prime},4,4{prime}-biphenyltetracarboxylic dianhydride and 4,4{prime}-oxydianiline. The mesopores of the COPNA-based carbon membranes did not penetrate through the total thickness of each membrane and served as channels which increased permeances by linking the micropores. The permselectivities of the COPNA-based carbon membranes were similar to those of the polyimide-based carbon membranes, which contained only micropores.
- OSTI ID:
- 289423
- Journal Information:
- Industrial and Engineering Chemistry Research, Vol. 37, Issue 11; Other Information: PBD: Nov 1998
- Country of Publication:
- United States
- Language:
- English
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