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21276Re: Distillation Time?

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  • abbababbaccc
    Aug 1, 2006
      Few points to Harry's excellent post.

      200 liters boilers are not unheard of in hobby circles, although the
      common sizes tend to be from 25 to 100 liters. Some like to make more
      at one go. It's also beneficial to have some headspace in your
      boiler, especially if processing malt mashes. For a 25 liters malt
      mash you can very well use 50 liters or even 75 liters boiler and the
      foaming won't bother you much. This is especially usefull when doing
      quick stripping runs using high power.

      You can use several heating elements to achieve quick warmup and
      slower distillation matched to your column size.

      The 2" column is NOT the only choice we have. I know many examples of
      2.5" and 3" columns and even some 4" columns. The quality tends to
      suffer some as we go for larger columns, but there are ways to fix
      that as well. There's also the possibility of using multiple 2"
      column to handle increased vapor production.

      Cheers, Riku

      --- In new_distillers@yahoogroups.com, "Harry" <gnikomson2000@...>
      > 50 gallon boilers are getting a bit beyond hobby distilling. You'd
      > need something a good deal bigger than a 50mm (2") diameter column,
      > and a better heat source.
      > There's a few basic principles you need to get your head around.
      > Bigger capacity boilers don't mean faster output. The output is
      > governed by the capacity of the COLUMN to process a given volume of
      > vapour. Sure, you can pour more vapour into the column, but you
      > immediately suffer quality loss (less % alc) in the resulting
      > distillate.
      > A given boiler size requires a certain amount of energy input to
      > boiling point, and to maintain that point. You could (in theory)
      > Sydney harbour if you had perfect (no loss) insulation, but putting
      > the resulting vapour up a 50mm column wouldn't work.
      > For larger scale distilling, the design scenario goes like this:
      > Decide how much distillate you want to collect per hour (1, 2, 10
      > gallons, whatever).
      > Then use calculations or computer software to construct a column
      > will do just that.
      > Then match a boiler and heat source that will supply the volume of
      > vapour necessary to feed the column.
      > Then again use calcs or software to design a condenser/heat
      > system to liquefy the separated solvent vapour the column produces.
      > See how the COLUMN is the pivotal element in all this? Not the
      > size? Same is true for hobby stills, but far easier, because we
      > already know how much vapour a 50mm column can handle "efficiently"
      > (don't forget that word).
      > A boiler with a max capacity of ~20 litres is easily a good
      > compromise. Much more (like your 50 gallons in one hit) and you
      > into trouble with preventing heat losses, or it takes forever to
      > or you pour in the heat and overdrive the column.
      > Much less (like 5 litres) and you're forever boiling, emptying,
      > recharging the boiler, and the time stretches out. However a 5
      > charge 'will' make enough rocket fuel in one go for a 40oz bottle
      > spirits. How much do you need to float your liver? Large
      > quantities 'always' makes authorities think "hah, commercial
      > operation!".
      > So the onus is on you as to which way you want to jump, but the
      > line is..."build a column to handle the desired production rate,
      > match the other bits to the column's capacity.
      > Slainte!
      > regards Harry
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