Why does the chlor-alkali industry use cation exchange membranes?
The reasons for the use of cation exchange membranes in the chlor-alkali industry are as follows:
1. Cation exchange membrane is a membrane that has a selective effect on cations, usually sulfonic acid type, with fixed groups and dissociable ions, such as sodium type sulfonic acid type fixed group is sulfonate, and dissociated ions are sodium ions.
2. The cation exchange membrane can be regarded as a kind of polymer electrolyte. Since the cation membrane is negatively charged, although the original dissociated positive ions are dissociated into water by the action of water molecules, they are energized outside the membrane through the action of an electric field, with positive ions. The charged cations can pass through the cationic membrane, while the anions cannot pass through because of the same-sex repulsion, so they have selective permeability.
