22306Re: Still with stripper
- Jul 31, 2004--- In Distillers@yahoogroups.com, "abbababbaccc"
> Nice work Johan! I finally had some time to go through the sketchThank you everyone for the encouraging replies :)
> and here's few questions:
> How much power are you using? I understand that the 200W figure(i.e..
> depends on how much distillate you feed to the second column
> power of the boiler comes to play via RR)?I used 700W total and I haven't checked exactly the production rate
but It's about two drops per second, maybe more, I'll check next
time. Yes the power on column 2 should be adjusted according to the
feed. The more power you use the faster it can separate. When I
tested this I didn't know how much the valve should have been
opened, but it wasn't that hard to adjust, Maybe I use more power
than needed for that column, but it's not much power anyway so that
doesn't matter so much. Instead of having a valve at the bottom I
think you could make a plate that removes about half the flux as
product, remaining part reboils. It will self adjust the power
depending on the feed then. Since I haven't tested that I can't say
if it'll work.
> From your drawing I assume that the control pipe of the firstcolumn
> is sealed at the bottom and open at the top? Does it need to beopen
> at the top?The product enter a pipe that is soldered onto the column. It's an 8
mm pipe. It's sealed at the bottom. So it will fill up with product.
once it is filled remaining goes out via the liquid lock and speed
is controlled with the valve so the RR won't drop too much. On the
top of that is an air escape to prevent siphoning. I ought to take a
picture of this but it's I've insulated all so much that it won't
help much right now. When I disassemble the still I'll take a photo,
if someone is planning to build this right now let me know, I'll
take a photo right away then. I made the liquid lock with a hose,
the needle valve is on the hose. The air escape is made with a T
connector. The reaction time on this setup is good, When the mash is
getting weak the product in the soldered pipe will boil and
production rate stops. then it starts again, the cycles are just a
few seconds, the weaker it gets the longer the boiling period gets.
> The second column is actually pretty straightforward, but I'd likeheads
> to know a bit more about the operation. First of all how much
> do you get from one run?I try to keep it at 10:1 at least, so 10 drops of product and one
drop of head. I'm not sure how concentrated you can have without
getting some in the product. Have to check that further. The longer
the stripper is the higher the concentration can be, the more power
you give column 2 the higher the concentration of heads can be. It
seems to do okay even at 30:1 but I need to make more runs to be
sure of that. I don't use a valve at the top, I use a pipe with
passive air cooling, check the pictures, so it a little bit
difficult to adjust.
>Do you need to remove them at all or couldThat's what you do in a way but I suppose you mean without removing
> you just let them buzz at the top of the column?
any, I think you need to remove some continuously or have a buffer
at the top to make that work. An interesting approach would be to
have a small bottle at the top the act as a buffer. All reflux from
c2 enter the bottle first and overflow from that returns to the
still. When the run is over, empty the bottle. Or make a head that
keeps a lot of reflux at the top and empty it at the end of the run.
>Isn't there ayou
> danger of overfilling column 2 if you withdraw the product slower
> than you feed the second column (I guess this is one reason why
> need the buffer)?Check the pictures again, you can't overfill c2 because some of the
reflux is fed to the boiler, the remaining comes out as product. If
you feed it faster, the same amount of reflux will go to the boiler
as before, and you get more product. The valve act like a power
controller. taking a certain amount of reflux and feed that to the
reboiler, overflow is product.
>You mentioned that the second column couldn't copeI made sure that there where alcohol in c2 to begin with so it where
> with high concentration of heads without the buffer, what exactly
> happened? Did you get heads out from the product pipe? Did you try
> to equilibrate the second column?
warm and ready for feed. When I fed it with product from c1 the
product from c2 still contained some heads. I can't turn off product
in c2 completely and let it equilibrate for some time, If I would do
that c2 will get more and more alcohol and the power will rise more
and more. But if you use a buffer at the top of c2.. then you have a
different situation.. now you got me thinking.
> Could you actually give a short description how you run this thingsure, I fill the boiler with mash. I turn on power and cooling. I
> and what adjustments are required? I suppose once you get it
> adjusted it runs by itself?
place a can at the product and a bottle for the heads. Then I don't
have to do anything more, the valves has been set for previous run
so I don't need to change them.
When I check back and see that it's done (product rate has dropped a
lot) I turn off power but not cooling!
Even if I turn off power c2 still has got power to run since that
column only needs warm mash to make the alcohol boil. After a while
the temperature in c2 drops as well since the mash in the boiler
cools down. A neat little thing is that some alcohol will be kept in
c2 so next time you start up the still, c2 is ready for feed even
before you start to feed it with product from c1.
oh.. there is one thing I have to do more with my setup, the
condensation tube for heads in my version of c2 can sometimes get
become a problem because of air that it trapped inside the
condensation tube. So I have to suck out the air manually.
First time you run the still you have to adjust the valve for c1 to
be what you think is approriate speed. then feed that to c2 and try
to figure out what the setting should be on that valve.
About the ARC head, as I said there are no tails, but apparently you
can't feed the boiler with just about anything. I tried to distil
some molasses mash to vodka, and it was okay until the end, then I
got rum taste anyway. So keep to good mash for vodka. Good length
and packing is essential. As you have probably seen some some
Swedish fellows and I are trying to develop the idea a bit further.
Maybe it's possible to achieve simple operation with one column
only, we'll see
> I guess I'll just have to build one sooner or later, I just wantto
> understand this more thoroughly before I start tearing down myYep it would be interesting to get data from more people. You always
> current rigs for spare parts :)
seems to make some interesting changes to the setup so I'm looking
forward to hear about the future designs. Don't forget that you can
use only one condenser insted if you feed the vapour from c2 back
to c1. Not sure but that could be an better design even though it
increases height some.
Using a stripper to remove heads is not my invention, it's something
done in the industry for many years but I guess I'm probably one of
the first to build a home version.
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