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Determination of PVDF-PAA membrane equivalent pore diameters dp and permeability between high and low pressure conditions (1.0 ≤ Δp ≤ 4.0 bar; T = 22 °C) at different pH values. Area of membranes = 13.2 cm2. Membrane thickness = 125 µm.
| pH | Dissociation degree of AA (%) |
Permeability (L/(m2·h·bar)) |
Pore diameter dp (nm) |
|---|---|---|---|
| 4.0 | 28.5 | 53.94 ± 7.59 | 222 ± 9 |
| 5.0 | 71.5 | 32.68 ± 3.39 | 198 ± 6 |
| 6.0 | 97.8 | 17.71 ± 1.28 | 171 ± 3 |
| 7. 0 | 99.6 | 7.44 ± 1.31 | 136 ± 7 |
| 9.0 | 99.9 | 3.39 ± 0.66 | 111 ± 7 |
