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Re: [Distillers] Still Design

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  • Mike Nixon
    Aaron Pelly wrote: Subject: [Distillers] Still Design I ve been thinking more seriously about building another column for my boiler. I have questions of course
    Message 1 of 35 , Sep 3, 2002
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      Aaron Pelly wrote:
      Subject: [Distillers] Still Design

      I've been thinking more seriously about building another column for my
      boiler. I have questions of course 8v)

      1) The (necessarily) cooler temperature of the condensate dripping onto the
      column packing in a N-S design must disrupt the reflux yes? Has anyone
      considered the implications of this? I do recall some brief mention
      somewhere (here or Tony's site I think) of not cooling the condensate too
      much. Should I care?
      The temperature of the condensate does not affect anything.  I have published two analyses of this, both of which show that the column is stable no matter what the temperature of the returned condensate.  Practical observation proves this.  You could cool the condensate with ice, and it would make no difference to the final result.  Don't worry about it.
      2) Would it help to thermally insulate the condenser from the column?
      I imagine that vapour management counters this by allowing you to pull off a
      percentage of the distillate _before_ it is condensed. This allows the
      condenser to be separate from the column. Nevertheless there is still a
      separate cooling coil in the head that must be precisely controlled. On the
      face of it this _seems_ more complicated, but perhaps it gives more
      versatility. Comments and explanations appreciated.
      Vapour management has nothing to do with how efficient the condensers are, and the reflux condenser requires no precise control whatsoever.  It must simply remove all the heat thrown at it, and if it removes more than required to just condense the vapour, then well and good.  There is nothing complicated in all this, so just follow the established designs that have been published and you won't go far wrong.
    • waljaco
      For no welding, have your vapor outlet (12mm copper tube) come out from the silicon or rubber bunger at the top (these large ones are used in wine barrels), do
      Message 35 of 35 , Mar 25, 2003
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        For no welding, have your vapor outlet (12mm copper tube) come out
        from the silicon or rubber bunger at the top (these large ones are
        used in wine barrels), do an arc and then go down parallel to the
        tower. You can make a 600mm long cooling jacket for this from 2/19mm
        plastic hydroponic/drip irrigation 'T-connectors'which have a 12mm
        inlet, and a 19mm PVC tube. Seal gap with silicon. The jacket for the
        copper tube does not have to be from copper as it is only carying
        cooling water. Use 2/13mm PVC tubes connected to the 'T-connectors'
        to provide the inlet and outlet water (in at bottom, out at the top).


        --- In Distillers@yahoogroups.com, "waljaco" <waljaco@h...> wrote:
        > 'The Compleat Distiller', suggests that reflux by internal
        > condensation (no reflux condenser at top) can be achieved with a
        > 1200mm high x 50mm diam column filled with scrubbers, heat source
        > 1000w(?). Adjust heat to achieve 78.6C at the outlet. This idea can
        > be used to upgrade a pot still for reflux easily. Get a 1200-1500mm
        > 50mm copper pipe. The bottom fitting is an inverted sink outlet,
        > while at the top you just fit a large wine silicon stopper fitted
        > with a digital thermometer. You only need to attach (weld or use
        > epoxy glue) your external condenser at a point inline with the
        > of the thermometer. You might not get 96%abv, but 92%abv is quite
        > improvement over a pot still!
        > Wal
        > --- In Distillers@yahoogroups.com, "moutwijn"
        > wrote:
        > > In theory your right, but to do so you would have to fit the pot
        > > scrubbers (if you use those) every time in exactly the same
        > > Because they obstruct the flow of the vapour and thus give you a
        > > certain unknown pressure build up.
        > > Even the atmosferic pressure would influence your still.
        > > It would be more easy to get a cooler and regulate the reflux.
        > >
        > > greetings,
        > > Moutwijn
        > >
        > > --- In Distillers@yahoogroups.com, "smudge311065" <smudge@b...>
        > > wrote:
        > > > I've received enough emails about my still design to realise I
        > > didn't
        > > > explain it very well. I'll try againÂ….
        > > >
        > > > Any column will have some natural reflux effect. Imagine you
        > > a
        > > > column so long that the top is at room temperature and
        > > has
        > > > condensed before it even reaches there. Somewhere up the column
        > > there
        > > > would be a point at 79 degrees, and if you fixed an outlet at
        > that
        > > > point, the vapour you extracted would be relatively pure
        > > >
        > > > The location of this 79-degree point could be calculated if you
        > > knew
        > > > the input heat and heat loss of the system. Unfortunately, it
        > > would
        > > > move depending on the temperature of the day, and would also
        > > as
        > > > the batch distillation progressed.
        > > >
        > > > Moving an outlet vent is not easy, but it would be possible to
        > > modify
        > > > the factors determining the location of the 79-degree point
        > (input
        > > > power & heat loss) to maintain it in the same location.
        > > >
        > > > This is exactly what I do. Because I want to extract everything
        > at
        > > > the 79-degree point, there is no point for the column to extend
        > > any
        > > > higher. The design concept is similar to that used for
        > > > distillation, but simplified as I am only trying to separate
        > > > components.
        > > >
        > > >
        > > > Smudge
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