Economic Homogeneous Bipolar Membrane (BPM) for Electrodialysis, CEEHBPM
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In the field of Bipolar Membrane Electrodialysis (BMED), a homogeneous bipolar membrane (BPM) is a specialized composite membrane designed to split water into H+ and OH- ions. Unlike standard exchange membranes that simply transport existing ions, the BPM acts as a "chemical reactor" that generates acid and base in-situ.
A "homogeneous" bipolar membrane is constructed by laminating two distinct ion-exchange layers at the molecular level, ensuring a seamless and high-performance interface: (1) Cation Exchange Layer (CEL): A negatively charged layer (usually sulfonic acid groups) that allows H+ to pass toward the cathode. (2) Anion Exchange Layer (AEL): A positively charged layer (usually quaternary ammonium groups) that allows OH- to pass toward the anode. (3) Intermediate (Catalytic) Layer: The thin region where the two layers meet. In homogeneous membranes, this interface is extremely thin and often contains a water-splitting catalyst (like metal oxides or specialized polymers) to accelerate the reaction.
Homogeneous BPMs are the "engine" behind resource recovery and circular chemistry: (1) Lithium Hydroxide (LiOH) Production: Converting Lithium Sulfate (Li2SO4) from brines directly into battery-grade LiOH and H2SO4. (2) Organic Acid Recovery: Recovering lactic acid, citric acid, or gluconic acid from fermentation broths without generating gypsum waste. (3) Waste Acid/Base Recovery: Regenerating NaOH and HCl from industrial salty wastewater, achieving "Zero Liquid Discharge" (ZLD). (4) Flue Gas Desulfurization: Converting captured SO2 into useful sulfuric acid.
| Part Number | CEEHBPM (C-E-EHBPM) |
| Functional Groups | Sulfuric Acid (-SO3H) and quarterly ammonia (NH4+) |
| Backing Foil | None |
| Wet Thickness (um) | 190-310 um |
| Burst Strength | >0.5 MPa |
| Tensile Strength | >25 MPa |
| Water Splitting Voltage | 1.1-1.3 V (100 mA/cm2) |
| Max Current | ~800 A/m2 |
| Faradaic Efficiency | >98% |
| Exchange Capacity |
0.7-0.9 (H+) 0.6-0.8 (OH-) |
| Operation Temperature |
≤ 40 °C |
| pH Range |
1-14 |
| Pre-treatment |
No |
| Primary Applications | Inorganic and organic acid recovery, LiOH preparation |
| Package Grade | 10cm*10cm/pcs/pack (other sheet size of 20cm*20cm, 30cm*30cm, 40cm*40cm, an 50cm*50cm also can be supplied upon request) |
Reference:
- D. İpekçi, et al., Effect of acid-base solutions used in acid-base compartments for simultaneous recovery of lithium and boron from aqueous solution using bipolar membrane electrodialysis (BMED), Desalination, 2018, 448, 69-75.
- X. Chen, et al., Production of lithium hydroxide by electrodialysis with bipolar membranes, Separation and Purification Technology, 2021, 274, 119026.