Homogeneous Cation-Exchange Membrane (CMHE) for Electrodialysis (ED) and Bipolar Membrane Electrodialysis (BPED), CEDHCEMCMHE
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Homogeneous cation-exchange membranes are a kind of ion-conductive polymer films engineered with uniformly distributed, fixed negative ionic groups (typically strong acid sulfonic groups, -SO3^-) covalently bound across a continuous, single-phase matrix.
The critical features of the homogeneous CEM are: (1) Uniform Ion-Conductive Pathways: Unlike heterogeneous membranes—which disperse ion-exchange resin particles within an inert mechanical binder—homogeneous membranes offer a seamless molecular architecture. This eliminates resistive boundary pockets and ensures an even current distribution across the entire active area. (2) Low Area Electrical Resistance: Engineered to maintain minimal electrical resistance (typically around 1.5 to 2.5 Ω*cm2 in standard sodium chloride solutions), drastically cutting down voltage drop and Joule heating during high-current operations. (3) High Cation Permselectivity: Features powerful Donnan exclusion properties, yielding high counter-ion transport numbers (typically >0.96) that effectively repel co-ions (anions) 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 CEM (CMHE series) |
| Membrane Thickness (Wet) |
150-280 um |
| Burst Strength |
>0.5 MPa |
| Area Resistance (0.5 M NaCl) |
<5.0 Ω cm2 |
| Maximum Current Density |
600 A/m2 |
| Exchange Capacity |
>1.8 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.