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Re: PDA1 still.

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  • mwmccaw
    Absolute agreement with what you wrote (excerpted below), Harry. The condenser, if fed with 20 deg C (or cooler) water at a pressure of 1 bar or higher, will
    Message 1 of 10 , Oct 23, 2006
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      Absolute agreement with what you wrote (excerpted below), Harry.
      The condenser, if fed with 20 deg C (or cooler) water at a pressure of
      1 bar or higher, will handle 2 kw with some room to spare, but product
      quality will noticeably suffer, and choking will become more likely.
      Cheers,
      Mike McCaw

      > I think 2000 watts for this extended column would be the upper
      limit,
      > if you want any sort of product quality at all. There's a
      correlation
      > between vapour speed, vapour volume and power input. More power
      means
      > more vapour in a given timeslice. This means more speed up the
      column
      > (diameter of column doesn't change), which in turn expands the HETP.
      >
      > Thus the point of best purity is extended upward and you need more
      > height (hence the column extension Amphora sells) to keep that point
      > within your rig. You also need more packing surface for separation
      as
      > the increased vapour speed reduces the time available for mingling
      > with downflowing reflux.
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