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-   -   Alcohol boil off during degassing? (http://www.homebrewtalk.com/f25/alcohol-boil-off-during-degassing-277250/)

PSUSkier 10-28-2011 03:13 AM

Alcohol boil off during degassing?
 
So I wasn't able to find a direct answer to this question so I thought I'd ask. I know you can boil off liquids under vacuum at room temperature if you apply enough of a vacuum, as well as remove the CO2 from the wine. I was curious if the Vacu Vin could generate enough of a vacuum to pull out the alcohol if one isn't careful.

I first beat the snot out of my wine with one of the drill stirrers until I didn't really see many bubbles coming up the side of the carboy. From there, I shoved one of the Vacu Vin stoppers onto a bung and proceeded to pump it out. I get a bunch of rather large bubbles rolling up the side of the carboy but I'm having trouble deciding where to stop. Do I go until I get no more bubbles or at that point will it be over-done?

WIP 10-28-2011 03:34 AM

Short answer... No way. That would take a lot of vacuum pressure.

PSUSkier 10-28-2011 03:49 AM

Short answer is perfect. That's what I figured anyway. Thanks a bunch.

daugenet 10-28-2011 09:57 PM

I had my wife run some numbers for me one day and she was telling me that you could boil some off if you had a hard vacuum and a temp over 100F. I dont think that many/any of us do that. I am sure that some alcohol is removed while degassing but I am sure that some water does as well. Both are very small.

azscoob 10-28-2011 10:28 PM

I know that the vacuum pumps we use for A/C systems can pull a vacuum of 29.82 inches of mercury, this is sufficent enough to boil out water in the system at any temp above 10

One of these pumps could easily be adapted and used to generate that kind of vacuum in a carboy, but what amount of vacuum would cause it to implode?

johnnync 10-28-2011 11:04 PM

A standard a/c system has a very small amount of water in it...maybe a few drops of condensation if it is left open for any amount of time.

I guess you could pull a vaccum at 30 inchs but with 5 gallons?...........it would take a LONG time to pull that much out of anything.

azscoob 10-28-2011 11:46 PM

Quote:

Originally Posted by johnnync (Post 3434654)
A standard a/c system has a very small amount of water in it...maybe a few drops of condensation if it is left open for any amount of time.

I guess you could pull a vaccum at 30 inchs but with 5 gallons?...........it would take a LONG time to pull that much out of anything.

It would take time for sure, but it is possible, I got the idea a while back with a few beer threads about making N/A beer, it could be done with vacuum as long as you hit the right vacuum to boil the alcohol and not the water. never bothered to try it though, a deep vacuum could certainly help degas fairly quickly I would guess.

azscoob 10-29-2011 12:07 AM

Scratch that idea, doing the math, and given alcohols low boiling point, at a temp of 75F it would only take 2.704 inches of mercury to boil off alcohol. I figured it would be higher than that.

So a deep vacuum would do more to boil off the alcohol than to simply degas.


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