this post was submitted on 20 Jun 2024
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[–] [email protected] 5 points 6 months ago (1 children)

There's actually more methanol in the tails than the foreshots due to complicated chemistry.

[–] nikita 1 points 6 months ago (1 children)

Can you elaborate or link to further reading?

I assumed methanol is the first to go because of its lower boiling point — 65 degrees compared to ethanol at 78

[–] [email protected] 1 points 6 months ago

this explains it a bit. The quick and dirty answer is that when you boil a mash, you are boiling a solution, not just 3 individual liquids (ignoring all the other stuff in there). It's similar to how adding salt to water lowers the freezing point and raises the boiling point.

Water is polar, while ethanol only has mild polarity. Methanol is more polar than ethanol, so it holds onto the water more. If you had a mixture of methanol and ethanol with no water, you'd probably get more methanol first, but the water changes things.