33756Re: So, how about a 1.5in column?
- Jan 2, 2006Dean Thomas replied:
> You can use a 1.5 inch column but to get the same results you will
> longer column or you will have to run your still slower.Sorry to jump in here, but may I ask this (to all - not just
Dean)...and it may be of help to the original question: Given the
above, how much slower...and how much longer (in real, practical
usage - say a 20 liter pot on a hotplate)?
Or put the opposite way, what, in real usage terms, is the benefit
gained by using a 2" column (shorter as was said)? This is important
to know so as to determine if the chase for 2" (true reward) will be
Is this all true?:
1. 1.5 inch column at say 24" must maintain slow take-off rate to
maintain high reflux ratio (at given cooling capability and power)
because of vapor speed.
2. 2" column at same height can enjoy faster take-off rate and can
run at lower reflux ratio but requires more heat and resulting more
So if he finds a piece a 2", how long of a piece does he need...if
it can be shorter? And how big does the coil need to be (inline)?
And what would be optimum packing height?
Going to homedistiller.org is good advice, but there are pictures of
columns there up to 5 feet tall (lots of packing!!)! Contrast that
with shorter (high purity) columns as short as the PDA-1 at 12" +
coil height! How's a beginner supposed to know how long of a piece
of copper to buy in either diameter, and how much packing height is
Answers to these would be a great quick-start for 'starch'.
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