Economic Ion-Exchange Membrane for Continuous Electrodeionization (EDI), CCEDIEIEM
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In an Electrodeionization (EDI) stack, the Ion Exchange Membranes (IEMs)—both Cation (CEM) and Anion (AEM)—act as the selective physical barriers that make the continuous purification process possible. While the ion-exchange resins inside the cells capture the impurities, the membranes ensure those impurities move in only one direction: out of the product water.
An EDI module consists of multiple "cells" created by alternating CEMs and AEMs. (1) Selective Permeability: CEM (Cation Exchange Membrane) with negatively charge allows cations (Na+, Ca^{2+}, H+) to pass through toward the cathode (negative electrode) but blocks anions. AEM (Anion Exchange Membrane): Positively charged; allows anions (Cl-, SO4^{2-}, OH-) to pass through toward the anode (positive electrode) but blocks cations. (2) The Concentration Mechanism: As the DC electric field is applied, ions are pulled out of the Diluate (Freshwater) Chamber, through the respective membranes, and into the Concentrate Chamber. Once an ion crosses a membrane into the concentrate stream, it is "trapped" because the next membrane in its path has an identical charge and repels it.
| Part Number |
CCEDIECEM (C-CEDI-ECEM) |
CCEDIEAEM (C-CEDI-EAEM) |
| Appearance |
Pink to Red |
Light Yellow |
| Exchange Capacity (Dry) |
2.0 mol/kg |
1.8 mol/kg |
| Selectivity |
≥90% |
≥89% |
| Dry Thickness |
0.4 mm |
0.4 mm |
| Area Resistance (0.5 M NaCl) |
≤19.0Ω cm2 |
≤20 Ω cm2 |
| Operation Conditions |
T<40°C, pH: 2-12 |
T<40°C, pH: 2-12 |
| Package Grade |
10cm*10cm or 20cm*20cm /pcs/pack (a larger size can be supplied upon request) |
10cm*10cm or 20cm*20cm /pcs/pack (a larger size can be supplied upon request) |
Reference:
- A. Grabowski, et al., The production of high purity water by continuous electrodeionization with bipolar membranes: Influence of the anion-exchange membrane permselectivity, J. Membrane Sci., 2006, 281, 297-306.
- V. Bhadja, et al., Comparative Efficacy Study of Different Types of Ion Exchange Membranes for Production of Ultrapure Water via Electrodeionization, Ind. Eng. Chem. Res. 2015, 54, 44, 10974–10982.