Homogeneous Anion-Exchange Membrane (AMHN) for Electrodialysis (ED) and Bipolar Membrane Electrodialysis (BPED), CEDHAEMAMHN
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Homogeneous anion-exchange membranes are a kind of ion-conductive films designed with uniformly distributed quaternary ammonium functional groups covalently bound to a continuous polymer matrix. They serve as critical components in both standard Electrodialysis (ED) and Bipolar Membrane Electrodialysis (BPED) systems.
The critical features of the homogeneous AEM are: (1) uniform Ion-Transport Pathways: Unlike heterogeneous membranes that rely on embedded resin powders within an inert binder, homogeneous membranes offer an unbroken, single-phase molecular structure. This eliminates dead zones and ensures even current distribution across the entire membrane area. (2) Low Electrical Resistance: Engineered to maintain minimal area resistance (typically around 1.5 to 2.5 Ω*cm}2 in standard sodium chloride solutions), which significantly reduces voltage drops and Joule heating during high-current operations. (3) High Permselectivity: Exhibits exceptional Donnan exclusion properties, yielding high counter-ion transport numbers (often >0.96) to effectively block co-ion (cation) leakage and maximize current efficiency.
Its main roles in electrodialysis are: (1) Selective Desalination: Used to selectively transport target anions (e.g., Cl-, SO4^{2-} ) from a dilute stream into a concentrate stream under an applied electrical field. (2) Foulant Mitigation: The smooth, non-porous surface morphology of homogeneous membranes lowers the risk of organic fouling and scaling compared to coarser heterogeneous alternatives, making them ideal for brackish water treatment, wastewater reclamation, and valuable salt concentration.
| Membrane Type/Mode |
Homogeneous AEM (AMHN series) |
| Membrane Thickness (Wet) |
80-120 um |
| Burst Strength |
>0.5 MPa |
| Area Resistance (0.5 M NaCl) |
<5.0 Ω cm2 |
| Maximum Current Density |
600 A/m2 |
| Exchange Capacity |
>1.2 mmol/g dry film |
| Thermal/pH Stability |
≤40°C / pH: 0-14 |
| Pretreatment |
No need |
| Storage Conditions |
The AMHN membrane should be keep in hydration status with pure water or 3% NaCl solution. |
| Package Grade |
L10-50cm*W10-50cm/pcs/pack |
Reference:
- M.C. Martí-Calatayud, et al., Ion transport through homogeneous and heterogeneous ion-exchange membranes in single salt and multicomponent electrolyte solutions, J. Membrane Sci., 2014, 466, 45-57.
- N.D. Pismenskaya, et al., Can the electrochemical performance of heterogeneous ion-exchange membranes be better than that of homogeneous membranes?, J. Membrane Sci., 2018, 566, 54-68.