Energy and Mass Transfers by Benallou Abdelhanine;

Author:Benallou, Abdelhanine; [Benallou, Benallou]
Language: eng
Format: epub
Publisher: John Wiley & Sons, Incorporated
Published: 2018-06-28T00:00:00+00:00

3.4.9. Transfer under the action of an electric field: electrodialysis

This process is specific to electrolytes, where anions and cations are in solution. Under the action of an electric field, the charged particles (ions) are subjected to forces that induce their migrations. This results in a mass transfer, which makes it possible to partially or totally extract the ions contained in the solution.

Thus, in electrodialysis, the ions are forced outside of a solution under the action of an electric field. The solution to be subject to electrodialysis is injected into compartments limited by ion-exchange membranes. There are two types of membranes that selectively let anions or cations through (Helfferich’s, 1962), but not both at once. As such, the anionic membranes are permeable to anions only, and the cationic membranes are permeable to cations only. Figure 3.22 shows an arrangement of electrodialysis cells prior to the passage of electric current. The solution to be purified (containing cations represented by green squares and anions represented by red spots) is injected into the different compartments.

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