How to remove sodium chloride in the production of sodium hydroxide solution using the diaphragm method
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After electrolysis is complete, the solution contains sodium chloride as one of its components. Some people say that evaporation concentration can be used. Sodium chloride is removed, but when the sodium hydroxide solution becomes hot. It is highly corrosive. How to avoid corrosion of the container during evaporation concentration? What materials are used for containers in industry? What is the specific process like?
Nickel materials are used, and sodium hydroxide is evaporated; currently, steam is commonly employed for two-effect or three-effect evaporation.
Is the process like this? Evaporate and concentrate the liquid until its concentration becomes very high. The table salt inside precipitates first; sodium hydroxide has a higher solubility, so it does not precipitate. Then, the salt is filtered out – is what remains not very pure sodium hydroxide?