Sciencemadness Discussion Board

azeotrope

lab33 - 22-12-2013 at 17:04

I want to make a methylamine solution in methanol by saturate methanol with KOH then add methylamine hcl to it.
As water is produce during this reaction,will the methylamine form an azeotrope with the water or will it form a ternary azeotrope with methanol and water?

DraconicAcid - 22-12-2013 at 17:26

Quote: Originally posted by lab33  
I want to make a methylamine solution in methanol by saturate methanol with KOH then add methylamine hcl to it.
As water is produce during this reaction,will the methylamine form an azeotrope with the water or will it form a ternary azeotrope with methanol and water?

You would probably be better off mixing your methylamine hydrochloride with a small amount of concentrated aqueous KOH, and running the gas produced through very cold methanol.

macckone - 24-12-2013 at 01:34

You could simply mix KOH and methylamine hydrochloride in methanol.
Both are soluble in methanol.
Obviously you want to be careful as this is very exothermic.

KCl is only 5.3G soluble per liter, so most will settle out.
If the KCl is a problem in future reactions then you may want to
further purify it.