Re: Scrubber Height/location in Reflux Column
- My first thoughts are to put the scrubbers down low. My train of
thought runs like this: The area with the scrubbers will do better
refluxing, although the "empty" parts of the column will help
fractionate from the height alone. With the scrubbers up high, the
vapors that reach them will only be slightly higher alcohol purity
than those leaving the pot and the vapors that leave the scrubbers
(which should be significantly higher proof) will go directly to the
condensor. With the scrubbers down low, the vapors leaving the
scrubbers (higher proof) will get further help with the added height
before the condensor. Since the scrubber section should do so much
better than the empty section, the small change in proof of what goes
into the scrubber section would be outweighed by any additional
refluxing of the vapors that leave the scrubbers. Also, with the
scrubbers at the bottom, any liquids that condense above them will
flow down and over the scrubbers (more vapor liquid contact = better
refluxing) with the scrubbers up high in your column, any liquids
that condense in the "empty" sections will just drip back into the
Did that make any sense? Just thoughts off the top of my head so I
could be missing something big.
I guess you could just do two controlled runs in both configurations
and report the results :)
--- In Distillers@y..., mrdripman@y... wrote:
> I have a new reflux still - a modified "Home Distillation" design.
> Main mod is to put the reflux tubes at the top of the column.
> are to make cleanout easier mostly. All I have done so far is test
> run it with water and it does work great.
> In looking at Tony's site about pot scrubbers versus % purity, I
> like to try to distill something like brandy where I want the
> and not just "pure spirits". I also want to try running it without
> any scrubbers and no water thru reflux tubes to see what I get
> (slightly better than pot still?).
> My question is: If I install less scrubbers, say 6-10 inches worth,
> rather than pack the whole column, would it be better to place them
> high up in the column near the reflux tubes, or install them down
> at the bottom of the reflux column? The engineer in me says put
> high, so that the main reflux action occurs in a more localized
> And if anyone has any other advice to lend relating to using a
> shorter scrubber length or a reflux column without scrubbers, I am
> all ears!
> Thanks for any help you can give me.