Bipolar Membrane (ASTOM, NEOSEPTA series, BPU) for Electrodialysis (ED) and Electrodeionization (EDI), CEEANBMBPU
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Astom's Neosepta Bipolar Membranes (such as the BP and BPU series) are composite ion-exchange membranes designed to split water molecules into protons (H+) and hydroxyl ions (OH-) under a reverse DC electric field. By integrating an anion-exchange layer and a cation-exchange layer back-to-back, they act as "virtual chemical generators" within electrodialysis stacks.
When integrated into a Bipolar Membrane Electrodialysis (BMED) stack, the membrane utilizes the electric field to catalyze the dissociation of water: Protons (H+) migrate toward the cathode side, combining with incoming anions to generate corresponding acids. Hydroxyl ions (OH-) migrate toward the anode side, combining with incoming cations to generate corresponding bases/alkalis.
The main advantages of Neosepta Bipolar Configurations are: (1) No Redox Byproducts: Unlike standard water electrolysis, BMED bypasses gas evolution at intermediate cell boundaries, leading to cleaner operations and significantly lower electrical energy consumption. (2) High Mechanical and Dimensional Stability: Neosepta membranes feature reinforced backing materials that resist swelling, delamination, and mechanical degradation under continuous multi-stream thermal and pressure cycling.
| Part Number |
CEEANBMBPU (C-EE-AN-BM-BPU) |
| Membrane Series Number |
BPU {(Bipolar membrane combining a cation-exchange layer (CEL) and an anion-exchange layer (AEL)}. |
| Thickness |
0.27-0.28 mm |
| Water Splitting Voltage |
~1.0 V (efficiency: ≥98%) |
| Burst Strength (MPa) |
≥0.70 |
| Operation Temperature |
T~40-50°C |
| Application |
|
| Package Grade |
10cm*10cm or 20cm*20cm/pcs/pack (a larger size can be supplied upon request) |
Note: All the cation-exchange membranes should be immersed in a DI water or 3-5% NaCl solution before use. Please keep it in a hydrated condition.
Reference:
- A. Awad, et al., Concurrent Production of Xylonic Acid and Xylitol from Xylose Through Sustainable Bipolar Membrane Electrodialysis, ACS Sustainable Chem. Eng. (2025) 13 (15): 5664–5676.
- S. Wang, et al., Simultaneous magnesium precipitation and lithium enrichment with extreme separation factor for high Mg/Li ratio brines, Desalination, 2025, 601, 118529