Sodium Chloride → Sodium chloride sodium sulfate

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The present invention also makes use of the fact that the solubility of sodium sulfate decreases with increasing concentration of sodium chloride. Thus, sodium chloride/sodium sulfate solid mixture produced at high temperature can be added to the sodium sulfate feed source, such that the sodium chloride is completely dissolved. This decreases the solubility of sodium sulfate, whereby anhydrous sodium sulfate is precipitated out of solution as the only stable solid phase. Thus, the raw material is converted to anhydrous sodium sulfate, and the sodium sulfate from the evaporation stage is recovered. The sodium sulfate can be used to produce potassium sulfate, and any excess material is a valuable co-product.

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