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Selectivity of supercritical CO2-treated PIM-1 membrane at 35 °C.
| Exposure Time | 2 h | 8 h | ||
|---|---|---|---|---|
| Depressurization | Rapid | Slow | Rapid | Slow |
| CO2/CH4 | 6.2 ± 0.3 | 8.0 ± 0.3 | 8.4 ± 0.4 | 8.2 ± 0.3 |
| CO2/N2 | 16.3 ± 1.5 | 20.9 ± 1.0 | 19.6 ± 1.3 | 20.7 ± 1.3 |
| O2/N2 | 4.0 ± 0.4 | 4.7 ± 0.4 | 4.3 ± 0.4 | 4.5 ± 0.4 |
| He/N2 | 4.5 ± 0.6 | 5.2 ± 0.5 | 5.2 ± 0.4 | 5.8 ± 0.5 |
| He/CH4 | 1.7 ± 0.1 | 2.0 ± 0.2 | 2.2 ± 0.1 | 2.3 ± 0.1 |
