Difference between diaphragm alkalis and ion-exchange membrane alkalis
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In caustic soda production, there are diaphragm caustic soda and ion-exchange membrane caustic soda. What is the difference between them? And why was ion-exchange membrane caustic soda developed?
The alkali produced using diaphragms has a concentration of 10–11%, and it needs to be evaporated and concentrated before it can be sold as a finished product. In contrast, the alkali produced with ion exchange membranes can be sold directly without the need for evaporation or concentration. There are several reasons for the development of alkali produced via ion exchange membranes: 1. When building new plants, investing in ion exchange membrane technology is more cost-effective. 2. The alkali produced has a high concentration and better quality. 3. To produce 1 ton of alkali, ion exchange membranes require less energy compared to diaphragms. 4. The purity of the chlorine produced is high, usually above 98%, and the purity of hydrogen is also high. 5. Pollution is virtually none, and the production costs are low
Ionic bases seem to have relatively high purity.
The carbonate concentration of ion-exchange membrane caustic is low
1# ddhui: Comparison of the quality of diaphragm alkalis – ion exchange membranes offer better alkali quality; this is a fundamental difference
This post was last edited by Qingtan Xiaolong on 2010-5-14 at 18:35. Is that so? I see, I’m a beginner and don’t quite understand
The sodium chloride content in ion-exchange membrane alkalis is lower than that in diaphragm alkalis; in other words, their quality is better than that of diaphragm alkalis. However, I’m not aware of the production costs – I only know that the purchasing cost of ion-exchange membrane alkalis is higher than that of diaphragm alkalis.
This post was last edited by Qingtan Xiaolong on 2010-5-16 at 18:42. Good things are expensive!
The biggest difference between ion-exchange membrane soda production and diaphragm soda production lies in the quality of the caustic soda produced. Ion-exchange membrane soda has a concentration of over 30%, with extremely low levels of salts, while diaphragm soda has a concentration of around 10% and contains more salts. Ion-exchange membrane soda features high purity of chlorine, a high degree of automation, lower strength, and less pollution.
Is there any detailed comparison of the advantages of the two?