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Author: Subject: Cleaning glycerol
sumatra
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[*] posted on 22-10-2018 at 07:30
Cleaning glycerol


So I made some glycerol ftom cooking oil (followed Nile Red's video on Youtube) however I somehow messed up the activated charcoal step. I used a lot and the glycerol-,methanol solution looked clear. I started boiling it down but at some point the solution became brown (sunflower oil pigments) and started smoking. Now I'm pretty much left with thick glycerol (almost no methanol) with a dark brown, almost black colour. Filtering doesn't work. Activated charcoal too. Suggestions?

[Edited on 22-10-2018 by sumatra]
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Jackson
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[*] posted on 22-10-2018 at 07:40


Maybe you could try washing it with some organic solvent that is immiscible?
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sumatra
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[*] posted on 22-10-2018 at 07:50


Quote: Originally posted by Jackson  
Maybe you could try washing it with some organic solvent that is immiscible?

I was actually thinking about chloroform, but I'm not sure and I wouldn't want to waste it.
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BaFuxa
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[*] posted on 22-10-2018 at 09:22


Looks like you have some oxidized fatty acids in your glycerol. Unsaturated fatty acids oxidize easily.










[Edited on 22-10-2018 by BaFuxa]

[Edited on 22-10-2018 by BaFuxa]




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sumatra
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[*] posted on 23-10-2018 at 08:27


Update:
I added chloroform to the glycerol and as expected it sank to the bottom, however it did not clean the glycerol at all, I added some water to reduce the solubility of whatever the colour is coming from, but it didn't seem to work either. Sadly I do not have a vacuum pump to perform a vacuum distilation and I'm not planning on buying one soon. Next thing I'll try is adding a lot of water followed by a lot of activated charcoal.
Any other suggestions?
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Jackson
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[*] posted on 23-10-2018 at 10:59


Maybe add a lot of chloroform and let it sit for awhile?
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