Spirit Stills and Reboilers?

[Fredrika Gross]

Hi Åke,

There was no condenser between the first and second distillations, the lyne
arm connected directly to the second pot.  I don't know the percentage of
liquid vs. gas entering the second still.

Ralph points out the fundamental issue that had confused me.  How can liquid
distillate vaporize in the second still without added heat (unless there's a
trick with pressure or volume)?   

I should have had the distillers explain this while I was visiting.  I think
I'll make some calls.

Brian


ps  Thank you for the article Peter.  I haven't been able to read it
carefully yet, but it's clear that the Aberlour takes advantage of waste
heat to operate their spirit still. 

-----Original Message-----
From: MALTS-L at RZ.UNI-KARLSRUHE.DE [mailto:MALTS-L at RZ.UNI-KARLSRUHE.DE] On
Behalf Of Åke Johansson
Sent: Thursday, August 03, 2006 6:53 AM
To: MALTS-L at LISTS.UNI-KARLSRUHE.DE
Subject: SV: Spirit Stills and Reboilers?

Hi again Brian,

But mustn´t there have been some sort of condenser after the first
destillation or there wouldn´t be any second distillation as the vessel for
that would be fed with vapours? Or was the second still designed as a
continuous still with the alcohol fumes from first distillation entering at
the bottom, a system of trays and reflux controlled by something colder
entering higher up?
But why bother with a pot still for first run if you in fact have a
continuous still afterwards in the line? 

Åke

-----Ursprungligt meddelande-----
Från: MALTS-L at RZ.UNI-KARLSRUHE.DE [mailto:MALTS-L at RZ.UNI-KARLSRUHE.DE] För
Fredrika Gross
Skickat: den 3 augusti 2006 08:49
Till: MALTS-L at LISTS.UNI-KARLSRUHE.DE
Ämne: Re: Spirit Stills and Reboilers?

Hi Åke,

Unfortunately that's not what I observed.

I'm pretty sure the output of the first distillation went directly to the
second distillation (reboiler or alembic still) and from there directly to
the condenser.

Brian

-----Original Message-----
From: MALTS-L at RZ.UNI-KARLSRUHE.DE [mailto:MALTS-L at RZ.UNI-KARLSRUHE.DE] On
Behalf Of Åke Johansson
Sent: Wednesday, August 02, 2006 4:05 PM
To: MALTS-L at LISTS.UNI-KARLSRUHE.DE
Subject: Re: Spirit Stills and Reboilers?

Hi Brian

My guess: The amount of energy involved in the first step is, due to larger
volume, larger than what is demanded for the second distillation. Entropy
may be a problem so good heat exchanging must be essential. Speculation:
Additional energy may be brought in by operating the condenser to achieve
slight vacuum.
Would the description at http://lorien.ncl.ac.uk/ming/distil/distileqp.htm
be similar to anything you observed?

Åke

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