Hi there, can anyone tell me how exactly hydrazine hydrate is made from hydrazine sulfate and calcium hydroxide? The last one is nearly unsoluble in
water, so it's not possible to react them as solutions, right?
Best regards
HellbatBert - 6-1-2016 at 08:06
Tons of existing hydrazine related threads here...
I have already spent some time searching for that synthesis, but I have not found anything about the way hydrazine sulfate can react with calcium
hydroxide, I just found information about other methods of making hydrazine. If potassium hydroxide is used instead, the two powdersare just mixed and
water is added, but the hydrazine must be distilled off which I would not like to do.
Now, I'm not sure whether it's the same procedure with the calcium hydroxide or not. If there's already a thread on that topic here on the board,
please send me the link as I haven't found one yet.Hellbat - 8-1-2016 at 07:20
So, nobody knows about that method?hissingnoise - 8-1-2016 at 11:02
You'll probably have to distill anyway, since your hydrazine will likely contain some dissolved gypsum . . .
Hellbat - 8-1-2016 at 11:59
But gypsum is nearly insoluble....hissingnoise - 8-1-2016 at 12:34
Its solubility is; 0.24 g/100ml at 20 °C.
BaSO4 is much less so!
Distillation isn't particularly difficult but the high pH will etch your glass slightly . . .
Hellbat - 8-1-2016 at 13:18
Yeah, but I don't want my distillation apparatus to explode from a hydrazine air mixture. So if I took Ba(OH)2 instead, maybe I could just
dissolve both chemicals in water, pour them together and filter off the BaSO4?hissingnoise - 9-1-2016 at 03:18
The hydrate doesn't normally form ignitable mixtures with air, but you should check out the links Bert gave?
Hellbat - 9-1-2016 at 08:11
I did, but as I said there was nothing about the Ca/Ba method. The only thing I've heard is that the BaSO4 formed can just be filtered off at the end
and no distillation is required. So, I'm wondering how exactly the reaction is done then. Maybe, the hydrazine sulfate and barium hydroxide are just
dissolved in water and poured together?hissingnoise - 9-1-2016 at 09:18
Quote:
The only thing I've heard is that the BaSO4 formed can just be filtered off at the end and no distillation is required.
Because of its reactivity, I would say distillation is required in all cases!
