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Edit: Deleting this post. It's starting to get controversial, but that's OK. Not what I planned on, but whatevers.
TLDR for anyone reading: Do not do this!
There is a very well laid out reason by @becausechemistry@lemm.ee in this thread, but suffice to say this is dangerous to an extreme and is not worth the risk to save a little money.
No no no no no.
I’m a chemist. Organic chemistry PhD, now a process chemist in the industry. I do this for a living. Do not distill isopropanol that’s been exposed to air for any meaningful length of time.
Isopropanol slowly reacts with oxygen in the air to generate peroxides that, when you concentrate them down, EXPLODE. Source. Sorry, not an open access journal. But please take my word for it.
Unless you have a way of confirming the peroxide levels in your isopropanol are near zero, do not concentrate it down by distillation. You’ll blow up your glassware, which will probably expose what you’re distilling to your heat source, which will generate a secondary fireball.
PLEASE do not do this.