Abstract
We report that 6FDA-2,6-DAT polyimide can be used to fabricate hollow fiber membranes with excellent performances for CO 2 /CH 4 separation. In order to simplify the hollow fiber fabrication process and verify the feasibility of 6FDA-2,6-DAT hollow fiber membranes for CO 2 /CH 4 separation, a new one-polymer and one-solvent spinning system (6FDA-2,6-DAT/N-methyl-pyrrolidone (NMP)) with much simpler processing conditions has been developed and the separation performance of newly developed 6FDA-2,6-DAT hollow fiber membranes has been further studied under the pure and mixed gas systems. Experimental results reveal that 6FDA-2,6-DAT asymmetric composite hollow fiber membranes have a strong tendency to be plasticized by CO 2 and suffer severely physical aging with an initial CO 2 permeance of 300GPU drifting to 76GPU at the steady state. However, the 6FDA-2,6-DAT asymmetric composite hollow fibers still present impressive ultimate stabilized performance with a CO 2 /CH 4 selectivity of 40 and a CO 2 permeance of 59GPU under mixed gas tests. These results manifest that 6FDA-2,6-DAT polyimide is one of promising membrane material candidates for CO 2 /CH 4 separation application.
Original language | English (US) |
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Pages (from-to) | 309-319 |
Number of pages | 11 |
Journal | Journal of Membrane Science |
Volume | 209 |
Issue number | 1 |
DOIs | |
State | Published - Nov 1 2002 |
Keywords
- 6FDA-2,6-DAT polyimide
- CO /CH separation
- Hollow fiber formation
- Mixed gas permeation
ASJC Scopus subject areas
- Biochemistry
- Materials Science(all)
- Physical and Theoretical Chemistry
- Filtration and Separation