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Operating conditions for the preparation of the hollow fibers (HFs).
| Conditions. | Membranes | ||
|---|---|---|---|
| M1 | M2 | M3 | |
| Dope flow rate (g min−1) | 5 | 5 | 3.6 |
| Bore Fluid (BF) flow rate (g min−1) | 3 | 3 | 3 |
| External Fluid (EF) flow rate (g min−1) | 3 | 3 | 3 |
| Air gap (cm) | 60 | 60 | 60 |
| Take-up velocity (m/min) | 5.5 | 5.5 | 5.5 |
| Temperature (T) dope (°C) | 50 | 50 | 50 |
| T coagulation bath (°C) | 21 | 21 | 21 |
| Bore fluid | water | water | water |
| Shell fluid | None | NMP/water (95/5) | NMP/water (95/5) |
