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Bipolar Membrane Electrodialyzer [ACILYZER BPED products]
About Bipolar Membranes
A bipolar membrane is an ion exchange membrane composed of an anion exchange layer and a cation exchange layer (Figure 7).
Applying bipolar membrane with DC current, water is split inside the membrane and then proton (H) and hydroxyl ion (OH) are generated. This unique function of water splitting is utilized for production of an acid and a base from a corresponding salt in combination with conventional monopolar ion exchange membrane.
About Bipolar Membrane Electrodialysis
By supplying inorganic salt (e.g., Na SO) to the 3 compartment process bipolar membrane electrodialysis stack (Figure 8), which combines anion, cation and bipolar membranes, the anion (SO2-) will permeate through the anion exchange membrane and combine with the H+ ion which is split at the bipolar membrane to produce acid (HSO). On the other hand, the cation (Na) will permeate through the cation exchange membrane and combine with the OHion which is split at the bipolar membrane to produce alkali (NaOH) (the opposite reaction of neutralization will occur).
Organic acids and alkali are produced by supplying organic acid salt (weak acid salt) into the 2 compartment bipolar electrodialyzer stack (Figure 9) that is made of bipolar membranes and cation exchange membranes combined together.
Example of production with bipolar membrane electrodialyzers
Characteristics of Bipolar Membrane Electrodialyzer ACILYZER BPED
Splits water into acid (H) and alkali (OH) with relatively low voltage.
Due to the absence of electrode reaction, no oxidation-reduction reaction takes place. Therefore, there will be no byproduct.
Produces acid and alkali from inorganic salt and organic acid salt a single process.
Controls the concentration rate of acid and alkali.
Different from electrolytic processing, no electrodes are required for through every single cell and, therefore, fewer fumes generated.
Produces less waste solution.
Can withstand continuous operations for an extended time since no regeneration process, like ion exchange resin process, is required.
Application examples of bipolar membrane electrodialyzers
・Production of organic acid from organic acid salt
・Production of amino acid from amino acid salt
・Production of acid and alkali from waste solution with salt
・Production of acid and alkali from inorganic salt
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Products Ion exchange membrane NEOSEPTA Electrodialyzers ACILYZER ED Electrodialysis reversal ACILYZER EDR Bipolar membrane electrodialyzer ACILYZER BPED [NEOSEPTA BIPOLAR] Diffusion dialyzers ACILYZER DD Tubular membrane electrode apparatus EDCORE
Application Salt production Food/Pharmaceuticals Drinking water production Waste solution treatment Recovery of acids/alkalis Other fields
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