Seeking advice on a process for concentrating hydrazine hydrate through evaporation
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Seeking advice on a process for concentrating hydrazine hydrate through evaporation: Currently, there is a hydrazine hydrate solution with a concentration of 50 g/L (used in urea chlorine production). Is it possible to concentrate this solution using evaporation? What should be the evaporation pressure? How is the concentration effect? What about the hydrazine in the water that evaporates? What kind of evaporation equipment should be chosen? Please give me lots of advice.
Simple evaporation cannot be used to evaporate hydrazine hydrate, because as evaporation proceeds, the concentration of hydrazine hydrate in the distilled water keeps increasing. Once azeotrope formation occurs between hydrazine hydrate and water in the reactor mixture, the concentration of hydrazine hydrate in the vaporized product becomes essentially the same as that of the feed water. Hydrazine hydrate is very dangerous at this concentration in the bath. The industry practice is to use a forced-circulation evaporator to vaporize all the hydrazine hydrate and water, then distill it in a distillation tower to obtain 40% hydrazine hydrate, and further distill it to get 80% hydrazine hydrate.