The drying problem of sodium sulfite heptahydrate
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After centrifugation, some free water remains in the sodium sulfite heptahydrate crystals; how can this free water be removed? Sodium sulfite heptahydrate tends to lose its crystalline water through air drying, and it also easily oxidizes to sodium sulfate. How can it be dried without losing its crystalline water or undergoing oxidation? Those who have experienced the drying of sodium sulfite heptahydrate, please share some tips. Thank you! Please note, it is sodium sulfite heptahydrate that is dried, not anhydrous sodium sulfite!
Why isn’t anyone responding? Hasn’t anyone dealt with this kind of problem before?
There is vacuum drying; you can refer to equipment used for vacuum drying, or consider drying under an inert gas atmosphere
Sodium sulfate heptahydrate is a metastable crystal; it loses its crystalline water at temperatures above 24.4°C； Therefore, the recommended solution is to air-dry at temperatures below 20°C! Or drain it in a vacuum oven at below 20°C. The original poster can give it a try!
This post was last edited by bccybb on 2014-1-8 09:33. You can try a vacuum low-temperature belt dryer.