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Author: Subject: KOH/NaOH azeotropic dehydration
oberkarteufel
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[*] posted on 4-3-2019 at 01:13
KOH/NaOH azeotropic dehydration


As I'm struggling with potassium production and I see treason everywhere, I suspect that my KOH may contain a wee bit too much moisture for the reaction to work.
I came up with the idea that maybe the hydroxide could be dehydrated through azeotropic distillation with toluene. However, I don't put much hope in this, as I was unable to find any traces of anyone trying this before. Can this work or it's all just my delusions and false hopes?


//I am aware that I could melt the hydroxide, but currently I have no place to do it safely.//
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12thealchemist
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[*] posted on 4-3-2019 at 03:48


My guess is that this won't work due to the high affinity of KOH and NaOH for water. This is typically why these are melted to dry them. I don't know if xylene boils hot enough to remove the water (140°C) but I suspect this isn't the case.
On a chemical front, have you tried heating the KOH/Mg/paraffin oil up to about 150°C until no more hydrogen is produced before then heating to 200°C? This will extend the "reaction" time and consume magnesium, but it will dry the KOH and paraffin oil before any potassium will form.




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oberkarteufel
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[*] posted on 4-3-2019 at 23:50


Your guess was correct, I guess ;) I've tried to dehydrate KOH using toluene and then xylene using Dean-Stark apparatus. In both situations the amount of water distilled off was negligible, as there wasn't enough to even separate out as a distinct layer of a distillate. KOH just kinda clumped into a single blob at the bottom of the flask.
So, case dismissed.

"K topic" will be continued here: https://www.sciencemadness.org/whisper/viewthread.php?tid=14... ;)
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