Alfa Chemistry Blog

  What Is Bipolar Membrane Electrodialysis? Bipolar membrane electrodialysis (BMED) is a system that combines electrodialysis (ED) and  bipolar membrane  (BPM), developed for its ability to convert anions and cations into acids and bases, respectively. BMED is composed of BPM,  cation exchange membrane  (CEM) and  anion exchange membrane  (AEM) in a certain arrangement, involving three basic membrane structures: Three-chamber BMED It contains CEM, AEM and BPM in each membrane repeating unit to achieve acid and alkali separation and recovery from salts. Two- chamber base-BMED It contains CEM and BPM in each membrane repeating unit for processing weak acid salts (organic acid salts) to obtain relatively pure bases. Two-chamber acid-BMED It contains AEM and BPM in each membrane repeating unit for converting weak base salts into relatively pure acids. How Bipolar Membrane Electrodialysis Works Under the action of a DC electric field, the bipolar membrane c...

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