Principle of producing caustic soda by the diaphragm method
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Could everyone please explain the basic principle of producing caustic soda using the diaphragm method? Thank you all, fellow sailors
The production principles for diaphragms and ion exchange membranes are the same; you can check out http://wenku.baidu.com/view/3c867968a45177232f60a2ab.html
As mentioned in the previous version above, both the diaphragm process and the ion-exchange membrane process use the same principle to produce caustic soda. The diaphragm process for producing caustic soda is energy-intensive, inefficient, and causes significant pollution. A diaphragm cell also serves to separate the cathode from the anode; however, the ion membrane cells that we commonly use rely on ion membranes for this separation purpose, while in a diaphragm cell, asbestos is used to adhere to the cathode mesh in order to separate the two electrodes. The liquid level in the anode side is higher than that in the cathode side, and a glass level gauge is used on the anode side to monitor the liquid level. The concentration of the diaphragm alkali is around 11%, and it contains a high amount of salts; therefore, corresponding centrifugation and evaporation units are necessary.