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RE: [Distillers] Continuous Stills

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  • J W
    Thanks again Tony Must make up a wash to test, will post results. Quite true I may as wall pack adaptor as well, as this will help disperse liquid evenly over
    Message 1 of 7 , Aug 1, 2005
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      Thanks again Tony
      Must make up a wash to test, will post results.
      Quite true I may as wall pack adaptor as well, as this
      will help disperse liquid evenly over packing from
      internal holes of outlet.
      JW




      > Very nice looking adaptor. Were you going to pack
      > it with some scrubbers too ? No need for the space
      > - might as well put that area to work.
      >
      > I've got no idea what the temperature at the feed
      > point "actually" is in mine, but if you were trying,
      > you would want your feed to be coming in at just
      > below its boiling point - eg around 91-92C for a 12%
      > wash. That way its ready to go as soon as it
      > enters, and doesnt form a "colder" zone in the
      > column. (thats why i eventually never did the
      > preheat - i wasnt going to get close to 91C, but i
      > guess any bit does help)
      >
      > (eg look at the McCabe-Theil diagram / applet I have
      > in http://homedistiller.org/refluxdesign.htm#multi -
      > you want the alcohol to start "stepping" its way up
      > in purity, and likewise, the water stepping its way
      > down in purity as it heads towards the boiler from
      > the moment it enters there - a colder feed would
      > effectively move that diagram a little to the left
      > ).
      >
      > You can basically draw this yourself just using the
      > diagram at the bottom of
      > http://homedistiller.org/theory.htm (the best
      > bloody picture in the whole site - its all you
      > need!) If you were to get your column into a steady
      > state equilibrium, then measure its temperature up
      > its height, you should be able to then draw on the
      > column what the respective alcohol and vapour
      > alcohol contents were. Any inlet up its height
      > should then be matched to suit accordingly
      > temperature & purity. I wasnt that precise with
      > mine. I figured that it would need about 3-4HETP to
      > strip out the water (see there are about 3-4 steps /
      > zig-zags if you come in at 12-14% alcohol, and head
      > towards 0%), so that was about 30-40 cm, and then i
      > gave it a bit more to allow for feed coming up to
      > temperature - thus the need for about 50-60cm for a
      > stripping section. And i knew that my regular
      > column hieght above would give the purity required
      > out the top.
      >
      > The column, if well insulated, can't "use up" all
      > the heat. The heat is effectively transported
      > through the column by the vapour/liquid mix. It
      > takes less energy to vapourise alcohol than water,
      > so there is always a surplus of heat up the column,
      > and further enrichment can continue to happen (up to
      > 95-96%) provided you give it sufficient height&
      > packing.
      >
      > Tony
      >
      >
      >
      >
      >




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