Selection of ion-exchange membrane caustic soda evaporation equipment
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This post was last edited by sunjl1981 on 2013-1-6 at 23:56. Should ion membrane caustic soda evaporation plants be sourced from domestic or foreign suppliers? Are there any mature manufacturers of complete systems available in China nowadays? I think it’s better to import complete production processes, as they can ensure product quality. Let’s discuss this together; there are experts who can offer some suggestions. Thank you # , , &
Why is it necessary to have a complete set of suppliers? There’s no significant difference between the evaporation process for ion-exchange membrane caustic soda and that for diaphragm caustic soda; the conditions are similar in both cases. Many manufacturers in China already possess mature technology for this process.
There are still differences between ion membrane evaporation units and diaphragm evaporation units. The evaporation of ion membrane electrolytes takes place at a rate of 32% to 50%. In addition, three-effect counter-current falling film evaporation processes are commonly used for ion membrane evaporation. However, the evaporators required for such processes cannot be manufactured in China; the main reasons are that the wire mesh collectors do not meet the requirements, and the thick walls of the falling film tubes prevent efficient heat transfer
Ion membrane evaporation technology is not a new concept in China either, but based on my experience, I would still recommend using imported complete sets of equipment. The ones from Botz in Switzerland are good; these systems utilize falling film evaporation technology, have excellent corrosion resistance, and are equipped with high-efficiency nickel mesh gas-liquid separators, allowing the alkali consumption to be kept below 0.8%.