Sciencemadness Discussion Board
Not logged in [Login ]
Go To Bottom

Printable Version  
Author: Subject: my ethanol is corrosive
CouchHatter
Hazard to Others
***




Posts: 140
Registered: 28-10-2017
Location: Oklahoma
Member Is Offline

Mood: enthused

[*] posted on 8-3-2022 at 18:46
my ethanol is corrosive


I have some denatured ethanol from a drum, and it smells like those bubble straw toys from the 90s. It is quite corrosive to metal: I used it to refill a 1-gal steel Crown can (which originally contained "denatured alcohol") but it quickly turned rust-brown and ate through the can in a few months. It also leaked from a 1-gal HDPE jug and totally corroded the finish on a set of steel drill tips.

-Are the denaturants likely making it more corrosive than pure ethanol?
-What sort of home tests could determine likely denaturants?
-Which types of reactions might it be unsuitable for in its current state?

I thought it might be a good source of Bitrex, but I don't want to also have other crap like pyridine.

Attachment: 1.webp (16kB)
This file has been downloaded 81 times

View user's profile View All Posts By User
Ormarion
Harmless
*




Posts: 35
Registered: 19-12-2017
Location: France
Member Is Offline

Mood: Alkylating her DNA

[*] posted on 8-3-2022 at 23:32


First thing i would recommend you is to be sure if it is ethanol itself, best would be a GC and a IR spectrum but i believe you don't have such equipement.

You can probably do the following test:
pH, density, residue (evaporating it and see if there is any solid left), boiling point, solubility wih water. I have personally never heard about corrosive ethanol.
Please be careful when working with it
View user's profile View All Posts By User
draculic acid69
International Hazard
*****




Posts: 1337
Registered: 2-8-2018
Member Is Offline


[*] posted on 9-3-2022 at 01:54


First thing U should do is stick a p.H. strip in and see if U get a weird result.
Alcohol has no p.H.
And no there shouldn't be anything in there that is causing the problems your seeing
View user's profile View All Posts By User
Lionel Spanner
Hazard to Self
**




Posts: 73
Registered: 14-12-2021
Location: South Yorkshire, UK
Member Is Offline


[*] posted on 9-3-2022 at 03:50


In my experience denatured alcohol can be stored perfectly well in metal and HDPE containers, which suggests what you have is something else.

Also, bubble straw toys contained acetone and ethyl acetate, so if it smells like that, that's another sure sign it's not alcohol at all. Denatured alcohol smells like methylated spirit.





Industrial chemist rediscovering the practical pleasures of pure chemistry.
View user's profile View All Posts By User
macckone
International Hazard
*****




Posts: 2146
Registered: 1-3-2013
Location: Over a mile high
Member Is Offline

Mood: Electrical

[*] posted on 10-3-2022 at 18:21


It doesn't take much water to cause steel to rust.
View user's profile View All Posts By User
markx
International Hazard
*****




Posts: 643
Registered: 7-8-2003
Location: Northern kingdom
Member Is Offline

Mood: Very Jolly

[*] posted on 14-3-2022 at 02:15


"Denatured alcohol" can actually be a mixture of many things, among others also ethyl acetate and several esters. Often EAF (ester aldehyde fraction aka heads) from ethanol production is used as denatured alcohol. The esters can break down over time due to various factors, liberating acids in the process...these in turn can cause corrosive effects upon contact with metallic items. E.g. as an experiment I used EAF as fuel in lawn mover and although it worked, it also caused severe degradation due to corrosion in the carburetor of the machine.



Exact science is a figment of imagination.......
View user's profile View All Posts By User

  Go To Top