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Author: Subject: MEK Substitute: OTC Ethyl Acetate
smuv
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[*] posted on 25-7-2012 at 16:33
MEK Substitute: OTC Ethyl Acetate


I was at first dismayed when I saw MEK Substitute had replaced MEK at a local home depot, until I checked the product's msds. MEK substitute is 100% ethyl acetate. To my knowledge no one has mentioned this as a source of ethyl acetate.

msds: http://www.wmbarr.com/ProductFiles/1636%20KS%20MEK%20Substit...

Product info:
http://www.wmbarr.com/product.aspx?catid=85&prodid=264




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[*] posted on 25-7-2012 at 18:53


I brought it up a couple months ago: http://www.sciencemadness.org/talk/viewthread.php?tid=17401#...




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smuv
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[*] posted on 26-7-2012 at 06:54


Stupid search engine. :P Like you I do wonder why mek needs to be substituted. Possibly b/c of odor? Although EtOAc is certainly not odorless.



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[*] posted on 14-8-2012 at 17:21


The MSDS states that "MEK Substitute" is 100% ethyl acetate, but based on my experience, that's not true.

After evaporating ~15 mL of MEK substitute on a watch glass, a substantial amount of gel-like residue remained on it. I distilled the MEK substitute, which removed much of the gel, but it still left concentric rings of residue on the watch glass after evaporation.

I suspect the gel is an additive to prevent the MEK substitute from evaporating too quickly. Perhaps stirring with activated charcoal or fractional distillation would help purify the ethyl actetate.
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