TheMrbunGee
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Purifying glycerol propylene glycol mixture
Hey SM,
I did something really stupid, and ruined about 4 liters of e-liquid (75% glycerol, 24% propilene glycol and about 1 % of some volatile aromatic stuff
by volume, and I have about 8g of nicotine as well in there)
What I did - I poured all of it in 5 liter bottle (because I wanted to mix different ratio mixtures) and heated it all in water bath, but the bottle
was too close to heat source and something form PET bottle went in to glycerol/PG mixture. and it all tastes like plastic now.
What I have in mind Is to purify it now (because that stuff is worth about 200 euros and up).
I am going to distill it, but my question is - should I add some activated charcoal or something to suck up that PET nastiness? could it alter any of
substances I have in liquid?
Thanks!
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Melgar
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It's not PET, actually, it's polyvinyl alcohol. There's a layer that's polar on the inside of soda bottles, (polyvinyl alcohol) that repels nonpolar
molecules, specifically CO2, because otherwise, the CO2 would all leak out and it would go flat. You could probably remove it by filtering through
activated charcoal. PVA molecules are quite large, and would stick to the charcoal, although you may end up clogging a few filters getting it out.
That should get out all the PVA though, and you shouldn't need to distill it. Not sure what your "aromatic stuff" is, or what would happen to it going
through a charcoal filter, though.
For future reference, it wasn't the heat that did it, although the heat would have sped up the process. The semi-polar liquid would have dissolved
the PVA's nonpolar coating, then proceeded to dissolve the PVA. You just shouldn't store any organic solvents in PET bottles that were meant for food
or beverages in general, although storing them in, say, old PET cooking oil bottles might be okay.
[Edited on 10/30/17 by Melgar]
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TheMrbunGee
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Ohh, that changes things.. But I have some doubts still, because I stored the liquid in the same kind of bottle for months and it was fine. The bottle
originally contained still water..
Okay, I will try to filter some of it without distilling first!
EDIT:
yes, seems like you are very correct! and I messed up, so I mixed liquids in a 5l bottle and poured in to 2 two liter bottles, one of them contained
still water - other carbonated. and the liquid from still water bottle is fine! so I have only less than 2 liters to clean up! 
Thanks, I'll try the filtering, when I will get the charcoal.
EDIT2:
Nope, the taste comes from 100ml dispensing bottles I got from ebay, the liquid from carbonated water bottle is fine too. there's that. I will write a
review.
Thanks! 
[Edited on 30-10-2017 by TheMrbunGee]
[Edited on 30-10-2017 by TheMrbunGee]
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Melgar
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Quote: Originally posted by TheMrbunGee  | Ohh, that changes things.. But I have some doubts still, because I stored the liquid in the same kind of bottle for months and it was fine. The bottle
originally contained still water..
Okay, I will try to filter some of it without distilling first! |
You say "same kind of bottle", but are you sure about that? One of those lightweight PET water bottles wouldn't have a PVA layer, for example. Many
other bottles do, even if the stuff in them isn't carbonated, because it also keeps out oxygen that could get in. By "still water", do you mean
"distilled water"?
Thinking about it, the nonpolar layer on top of the PVA could be another culprit, but is probably thin polyethylene or PET. If it looks like there's
a plastic layer peeling off inside it, you might be seeing the nonpolar layer separating from the PVA, and the PVA is thoroughly dissolved in your
liquid.
The first step in the process of learning something is admitting that you don't know it already.
I'm givin' the spam shields max power at full warp, but they just dinna have the power! We're gonna have to evacuate to new forum software!
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TheMrbunGee
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| Quote: Originally posted by Melgar | | Quote: Originally posted by TheMrbunGee | Ohh, that changes things.. But I have some doubts still, because I stored the liquid in the same kind of bottle for months and it was fine. The bottle
originally contained still water..
Okay, I will try to filter some of it without distilling first! |
You say "same kind of bottle", but are you sure about that? One of those lightweight PET water bottles wouldn't have a PVA layer, for example. Many
other bottles do, even if the stuff in them isn't carbonated, because it also keeps out oxygen that could get in. By "still water", do you mean
"distilled water"?
Thinking about it, the nonpolar layer on top of the PVA could be another culprit, but is probably thin polyethylene or PET. If it looks like there's
a plastic layer peeling off inside it, you might be seeing the nonpolar layer separating from the PVA, and the PVA is thoroughly dissolved in your
liquid. |
by "same kind of bottle" I meant from the same manufacturer containing the same water and by still I meant not carbonated.
And I figured out that the smell/taste comes from these!
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Melgar
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It's just residue from manufacturing, then. Store acetone in them overnight and they'll probably be fine the next day.
The first step in the process of learning something is admitting that you don't know it already.
I'm givin' the spam shields max power at full warp, but they just dinna have the power! We're gonna have to evacuate to new forum software!
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TheMrbunGee
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| Quote: Originally posted by Melgar | | It's just residue from manufacturing, then. Store acetone in them overnight and they'll probably be fine the next day. |
I'll do that, thanks!
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