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mackolol
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[*] posted on 4-11-2017 at 10:10
Purifying denaturated alcohol


I was wondering if i can purify denatural by converting it to chloroethane by esterification with hcl catalysed by h2so4 distilling it and then converting it back to alcohol using NaOH. Even if it wasnt efficient im wondering if i can get pure enough EtCl from denatural
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JJay
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[*] posted on 4-11-2017 at 16:59


Unlikely.



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Corrosive Joeseph
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[*] posted on 4-11-2017 at 23:25


Quote: Originally posted by mackolol  


Purifying denaturated alcohol



Can you post your MSDS............?


/CJ
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LearnedAmateur
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[*] posted on 5-11-2017 at 04:15


Whatever you do to the ethanol, you'll also do to the methanol present (although if your formulation happens to not contain it as the denaturant then the situation might be different). In order to substitute the hydroxyl for a chloride, you'll be better off using a Lewis acid catalyst (ZnCl2, AlCl3) and it will need to be refluxed for a while. Chloroethane is a gas at room temperature (BP = 12.3C) so it won't be easy to collect either.

Denatured ethanol is usually blended in such a way that it's incredibly difficult to purify, for obvious reasons. I'd recommend looking for other sources of ethanol - anhydrous is hard to obtain but you can find 95% ethanol with water online, this can be distilled if it leaves a residue, and dried over a dessicant to >99%.




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mackolol
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[*] posted on 5-11-2017 at 04:28


There is nothing special in msds and since it is in other language it would be big effort for me to translate it. There is 92% ethanol and denaturing agents are not given. But i think every denaturated alcohol has the same pollutants such like pyridine or thiophene. i dont know agents what are used for this. My question is will is work for any denaturated alcohol because chloroethane has very low boiling point. I can only tell that there is no methanol.
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mackolol
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[*] posted on 5-11-2017 at 04:32


I was wondering because pure ethanol is expensive due to excise. In my country denaturated is like 9pln for 1l and pure 90pln for 1l.

[Edited on 5-11-2017 by mackolol]
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unionised
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[*] posted on 5-11-2017 at 07:20


The high price of pure alcohol is mainly due to tax .

There must already be stacks of threads on cleaning alcohol on this site somewhere.
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Mesa
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[*] posted on 6-11-2017 at 02:59


There are a fair few denaturing agents possibly used in OTC metho. THF and/or denatonium benzoate are somewhat common over here in aus, whereas methanol has been long banned from all denatured alcohol products here.

Location/local laws and regulations are pretty relevant here. I had a brief attempt at a project like this in UK, then in Aus, but it was way too tedious to be useful. Later I tried again during some time in Fiji, and quickly found the local stuff I got contained only ethanol and acetone and/or 2-butanone as denaturant.
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TheNerdyFarmer
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[*] posted on 6-11-2017 at 03:25


Here the seller claims that theirs is not denatured:
https://www.ebay.com/itm/0-250ml-Ethanol-Alcohol-95-Absolute...

I don't know the legitimacy of it though. Kind of expensive too :/

[Edited on 6-11-2017 by TheNerdyFarmer]
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zed
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[*] posted on 6-11-2017 at 15:44


Oregon price is ~15$ US for 750 ml 95% Etoh, beverage grade.

Overpriced perhaps, but universally available.
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