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SuperOxide
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[*] posted on 7-11-2021 at 12:32


Quote: Originally posted by monolithic  
I noticed the same impurity in Heet, but it never seems to come over in distillation. No idea what the impurity is, it doesn't show up on this NMR: https://ilrc.ucf.edu/sample_detail.php?sample_id=443


Never came out over distillation? Interesting. I did a fraction distillation and basically only kept what came over at 64.0-64.9 °C. Not much came over under that, and when it rose above that I just stopped it and let the rest evaporate. Which is what was in the above pic.

What range did you keep?



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monolithic
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[*] posted on 8-11-2021 at 05:40


Quote: Originally posted by SuperOxide  
Quote: Originally posted by monolithic  
I noticed the same impurity in Heet, but it never seems to come over in distillation. No idea what the impurity is, it doesn't show up on this NMR: https://ilrc.ucf.edu/sample_detail.php?sample_id=443


Never came out over distillation? Interesting. I did a fraction distillation and basically only kept what came over at 64.0-64.9 °C. Not much came over under that, and when it rose above that I just stopped it and let the rest evaporate. Which is what was in the above pic.

What range did you keep?


Tbh I don't pay attention to the endpoint. I know Heet is pretty clean out of the bottle, so it's usually just a simple distillation: discard the first 10 ml or so and leave 10-20 ml at the tail end because I'm paranoid about distillation to dryness.
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Morgan
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[*] posted on 8-11-2021 at 18:16


That was interesting seeing the remaining residue/gunk in Heet after distillation. I wonder if the additive(s) is/are a corrosion inhibitor or something to protect elastomers from degrading or both or yet some other additive purpose? Or simply a byproduct from the manufacturing process.

Other thoughts ...
Maybe oxygen is synergistic in some way with Heet even when highly diluted by adding it to a tank of gas in a car.
"Oxygen is more soluble in methanol than it is in water. Methanol can contain up to 40 mg/L of dissolved oxygen at 25°C." Fresh water right at 0 C will hold 14.6mg/L and at 25 C 8.2mg/L.
https://www.fondriest.com/environmental-measurements/paramet...
https://onepetro.org/NACECORR/proceedings-abstract/CORR07/Al...


[Edited on 9-11-2021 by Morgan]
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macckone
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[*] posted on 10-11-2021 at 14:21


heet is industrial grade methanol, it is supposed to leave zero residue after ignition in a gasoline or diesel engine. So there could be hydrocarbons in it. Possibly as a lubricant. Maybe an emulsifier in case there is too much water in the tank.
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