Spirit Stills and Reboilers?

[Fredrika Gross]

Hi Horst,

One of the distilleries used a copper wash still (with reboiler), the other
used a stainless (with alembic).

In the latter case the second distillation certainly provided contact with
copper.  In both cases the second step was performing a distillation.

I'm intrigued by the double/thumper, however.  I'll need to look at that.

Brian

-----Original Message-----
From: MALTS-L at RZ.UNI-KARLSRUHE.DE [mailto:MALTS-L at RZ.UNI-KARLSRUHE.DE] On
Behalf Of Horst Luening
Sent: Wednesday, August 02, 2006 11:07 PM
To: MALTS-L at LISTS.UNI-KARLSRUHE.DE
Subject: AW: Spirit Stills and Reboilers?

Hello Dave!

We already talked about this here and came to two different conclusions.

This is my thinking of it and how I understood this during explanations in
several Bourbon plants:

The doubler/thumper is no distillation device. Because a lot of column
stills are now made of stainless steel, you need some time of contact
between the raw whiskey (white dog) and copper. This is to have the
necessary catalytic processes going. Because you loose some energy over the
pipes to the doubler you need some heating too. This has nothing to do with
distillation.

Perhaps this is also the answer to the question? May this device be only in
place for more contact of the alc. fumes with copper?

Regards,
Horst

-----Ursprüngliche Nachricht-----
Von: MALTS-L at RZ.UNI-KARLSRUHE.DE [mailto:MALTS-L at RZ.UNI-KARLSRUHE.DE]Im
Auftrag von djrussobik at AOL.COM
Gesendet: Donnerstag, 3. August 2006 01:47
An: MALTS-L at LISTS.UNI-KARLSRUHE.DE
Betreff: Re: Spirit Stills and Reboilers?


Is this (or could this be) how the second distillation in a doubler/thumper
in some Bourbon distilleries also is accomplished?.  I never quite figured
out how this step actually was implemented -- it certainly seemed to be
distinct from both the traditional pot-stills and column-stills, and not
obvious if there was a direct source of additional heat.   Any one know how
THAT distillation/step is performed?

  Thanks and Slainte!
    Dave in Boston

 
-----Original Message-----
From: ake.j-son at BREDBAND.NET
To: DJRussoBik at AOL.COM
Sent: Wed, 2 Aug 2006 7:12 PM
Subject: Re: Spirit Stills and Reboilers?


Hi again,

Another speculation: the liquid of the second step may also be more
volatile due to higher alcohol contents thus boiling at lower temperature.

Åke

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