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-   -   Fractional freezing (http://www.homebrewtalk.com/f14/fractional-freezing-117657/)

Brewster2256 05-05-2009 05:13 AM

Fractional freezing
As always, I was doing random searches and getting hopelessly lost on wikipedia when I came across Fractional freezing - Wikipedia, the free encyclopedia
Now, I've heard of beers being in the excess of ~25% ABV, mainly Utopia by Samuel Adams and seem to have read that fractional freezing was one of their methods of getting the ABV% that high.

Anybody have anymore information on the process or how it could be translated for home brew use? For example, would it be possible to brew a strong ale/barley wine using a high-tolerance yeast, and somehow use fractional freezing to get the percentage beyond the scope of yeast, whilst still retaining the flavor and complexity of a good ale?

oswiu 05-05-2009 06:19 AM

Never done it myself, but it's the traditional way to make an eisbock (essentially a doppelbock that undergoes fractional freezing in order to bump up its ABV.)

I did a (very) quick search for eisbock on HBT and didn't notice any big discussion threads about making them, but there were a few hits related to people's sigs, so it seems as though some HBTers have some experience with the process anyway.

Maybe a more thorough search here, or a specific question about people's eisbock experiences might get you the info you're looking for :)

g_rath 05-05-2009 11:34 AM

That is a discouraged topic on this forum do to it being closely related to distilling. You will probably have better luck on a distilling forum.


Ysgard 05-05-2009 01:03 PM

It's also known as jacking, is a form of distillation, and is illegal in many states. This thread should be locked soon.

Boerderij_Kabouter 05-05-2009 01:16 PM

It will be locked but I don't really know why. This is a legal method and I think it would be interesting to try. An Eisbock would be a fun brew.

phillc 05-05-2009 01:17 PM

Is it REALLY that bad to simply discuss these things? I have no interest in doing this whatsoever, I am now aware that there are legal issues, and yet I find the discussion interesting. What's wrong with that?

Boerderij_Kabouter 05-05-2009 01:23 PM

I do intend to do it and it is legal in WI.

sully 05-05-2009 01:24 PM

there is a video at basicbrewing.com that james makes a small batch barleywine and then steve lets us all know that the method is actually legal and is not a method of distillation at all, it is a method of concentration therefore we can talk about it and expieriment with it all we want. im going to brew a 1.120 ale then concentrate it and end up with something like 22-23% and age it on some oak.

Jaymo 05-05-2009 01:58 PM

Thanks for posting that Sully. I was about to type the same thing when I scrolled down to your post :)

This freezing method was discussed on a few of the Basic Brewing podcasts. They, also, made the mistake of thinking it was illegal, but were corrected and checked in with the government about it. It is not considered distillation!

I was considering trying this with a gallon of barleywine as well, but eisbock also sounds tempting! Once you've got your batch brewed, the additional process sounds pretty easy.

PseudoChef 05-05-2009 02:02 PM

+1 for the it's completely legal and has always been (in the scope of homebrewing).

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