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Old 10-26-2013, 10:01 PM   #1
sharkriver
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inexperienced brewer here. The thought came to me that if methanol boils at a lower temperature than ethanol at atmosperic pressure than the same must be true under a vacuum. While degassing with a vacuum pump after the co2 is gone, would not the methanol boil off before you started to lose ethanol? what do you think?

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Old 10-26-2013, 10:04 PM   #2
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inexperienced brewer here. The thought came to me that if methanol boils at a lower temperature than ethanol at atmosperic pressure than the same must be true under a vacuum. While degassing with a vacuum pump after the co2 is gone, would not the methanol boil off before you started to lose ethanol? what do you think?
Depends on the pressure of the vacuum and the temperature. The CO2 is already a gas.
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Old 10-28-2013, 05:13 PM   #3
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I guess what I mean to say that if the boiling points are different at atmospheric pressure they will be different at a vacuum regardless of the temperature or pressure that they are both under.?

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Old 10-28-2013, 05:53 PM   #4
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The theory is certainly sound. You would need to be able to control both temperature and pressure simultaneously pretty accurately.

http://en.wikipedia.org/wiki/Vacuum_distillation

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Old 10-28-2013, 06:39 PM   #5
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Don't get caught vacuum distilling.

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Old 10-28-2013, 08:12 PM   #6
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Thanks for the heads up neo. Trying to get rid of alcohol (methanol) not collect it. I think that if I could keep a steady vacuum and monitor temperature with an immersed thermocouple, I could tell when the methanol was gone because the temperature would be constant and then change once the metanol was gone. It would then rise to the ethanol boiling point for that pressure. Sounds like fun. I have a few weeks to wait untill I can try it. Thanks so much for the help. On second thought I need to rethink this, some thing is not right

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Old 10-28-2013, 09:00 PM   #7
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Feds don't care the reason or end result only the possible results. Legally its unlawful to freeze excess water out of booze.

Just saying, I've wasted money to have lawyers decode and explain the finer points just so I can make fuel.

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Old 10-28-2013, 09:48 PM   #8
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How would you collect the methanol once it evaporated?

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Old 10-28-2013, 10:25 PM   #9
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Feds don't care the reason or end result only the possible results. Legally its unlawful to freeze excess water out of booze.
No, it's not.
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Old 10-29-2013, 10:08 PM   #10
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I guess I didn't explain what I was doing. I made my first batch of applejack and I am trying to figure out a way to remove methanol from hard cider, applejack or home brewed wine. A guy at work told me about vacuum degassing of co2 with a real vacuum pump. He said that bubbles start out small at first(co2) and then get large (Methanol) after which if he continued the gas woul be ethanol. in theory. He believes that because the boiling points are different, you can boil off one without the other. Not trying to collect metahnol. Just get rid of it. Would be great not to drink that stuff.

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