## Re: Can anyone post their experience with 3 inch / 76mm diameter columns

Expand Messages
• Some time back when I thought I had done quite a bit of reading I posted a few questions and Harry got back to me with the answers and a lot of links proving
Message 1 of 21 , Dec 4 7:20 AM
Some time back when I thought I had done quite a bit of reading I
posted a few questions and Harry got back to me with the answers and a
do :-)

In this link under "Theory" you'll find "Reflux Still Design Theory"
and "Coulmn height" underthat. If you work out the math You'll be a
better judge to know how high is enough for you. You need to know the
vapour through put that your boiler would give off.

on average
"No packing, purity = 62% , 15cm packing = 82%, 30cm = 88%, 45cm =
90%, 60cm = 92%, 75cm = 92.8%, 90cm = 93.4%, 105cm = 93.9%. These
won't be exact, and depend on a number of different factors, but it
shouldn't be too far off."

And they where talking about 2" wide coloumn at most. On 2" columns
150cm is supposed to give you real good purity. I'm talking about 95.5
and the likes. How much is too much is for you to decide.

But when you widen the column to 3" the purity will fall. I think 1.5
meters is a good place to start. I'm not sure but I think you will be
going higher if you want a high purity cause the funny thing is that
the first levels of purity are eaisly achived (with little hight
increase). But from 90% it starts gets tough to push it furthur. You
would need to put in more height per %.

I guess you would already be knowing that commercial still that target
at vodka (pure ethnol, no flavour) usually use columns that are 4" and
wider. But they dont just use a mesh or something like we do. They use
actual plates, that has water flowing through them, throughout the
column that the vapour pushes through and bubbles upward to the next
plate.

Regards
Surya.

--- In Distillers@yahoogroups.com, "mavnkaf" <mavnkaf@...> wrote:
>
> Thanks Surya for your input, I'm thinking a column height of about
> 1.5 meters to start with would be A good starting point . If I have
> to go higher, no prob's. Thanks for your other pointers as well.
>
> Cheers
> Marc
>
>
>
> --- In Distillers@yahoogroups.com, "surya9375" <surya9375@> wrote:
> >
> > Hi
> > I dont have a 3" still but for high purity I dont think anything
> > should be much different.
> >
> > Hey guys if I say anything wrong here. Please feel free to comment
> > and correct me.
> >
> > However the differences would be (according to me):-
> >
> > 1, Insulate the column properly. Even the 2" columns need this but
> if
> > its not done I guess the effect would be more seen in a 3" column.
> >
> > 2, Almost all docs state that in wider columns (like the 3" ) you
> > should not use copper scrubbers and go for marbles and the likes.
> but
> > I think the option of copper mesh did not cross them at the time.
> And
> > I think that a copper mesh rolled with the right diameter should
> be
> > the best.
> > I think they were against copper scrubbers cause scrubbers had a
> > particular diameter and if its smaller than the column diameter
> then
> > they wouldnt stack properly and would leave empty spaces as well,
> > leading to channeling. I guess you could buy 2, 1pound copper
> mesh's
> > from Amphoria and take the second one and roll it over the first.
> > Push this into the 3" column.
> >
> > 3, Dont rush the vapour.
> >
> > 4, The column height would definetely have to be taller in a 3" to
> > achieve the same strength as in a 2" column.
> >
> > These are my pointers for now.
> >
> > Hey if things work out post it back to this site and let us know
> how
> > things went.
> >
> > Regards
> > Surya
> >
>
• I run a 4 inch colum still for making alcohol using the FFS plans posted on the alcoholfuel list. It produces 5 gallons per hour of 195 proof alcohol but it is
Message 2 of 21 , Dec 4 10:58 AM
I run a 4 inch colum still for making alcohol using the FFS plans
posted on the alcoholfuel list. It produces 5 gallons per hour of 195
proof alcohol but it is all the alchols mixed together (as this is a
fule alcohol still)
The alcohol can then be run through a smaller (50mm) seperating
column to seperate the alcohols at an incredable speed. you have to
be on your toes though as you can miss the seperation point quickly.

Donald

--- In Distillers@yahoogroups.com, "mavnkaf" <mavnkaf@...> wrote:
>
> After building a 2.5 meter 50 mm LM still with insulation, 1100
watt
> stillspirit element in a 20 L hot water Urn. I found the purity
> went up alot but I did not feel comfortable to increase the liquid
> off take too much. So the time taken was only about 2 hours
shorter
> than normal(10 hours).
>
> SO after talking to one of the Mike's I'm thinking about making a 3
> inch / 76 mm diameter column. Can anyone tell me about their
> experiences in making and running such a still.
>
> Also what type of still design a 76 mm column would it lend self
> to?
> LM,VM also the condenser type. I can make a shotgun condencer, and
> all ready have a 50 mm shotgun condenser that has about 6.3 meters
> copper 6mm tubing if its helpes? But happy to make one like
Stevo's.
>
> The maths, well I don't much, but I think it goes like
4.9x2000/750=
> 1306"/sec @ 3 inch column in a unpacked column which I'm told is,
>
> "which is right on the nose for all intents and purposes. It's not
> the length of the column that matters, but its diameter. All the
> best,
> Mike Nixon"
>
> So what I'm after is results and if possible a good starting lenght
> for such diameter. Any takers?
>
> Cheers
> Marc
>
• Here are some observation from 3 columns versus 2 stuff: On average you loose ~1% ABV when moving from 2 to 3 if all other parameters are kept equal. In
Message 3 of 21 , Dec 4 10:42 PM
Here are some observation from 3" columns versus 2" stuff:

On average you loose ~1% ABV when moving from 2" to 3" if all other
parameters are kept equal. In practise thise means that HETP is
increased by 50% using very rough estimation. This promotes the use of
higher column to fix things. For height I'd recommend at least 1.5
meters if you can afford it.

Packing, as mentioned mesh rolls are recommended to avoid voids in
packing.

Product removal, for neutral alcohol VM and ARC are the best.
Succesfull 3" columns have been built using both approaches.

Power, 2kW to the column works well.

Otherwise things are roughly the same as they are with 2" columns.

Cheers, Riku
• Head on Rikku. I would just like to adda comment from a reply I got from Amphora Society when I enquired to purchase the copper mesh. ... If this is true then
Message 4 of 21 , Dec 5 12:13 AM

I would just like to adda comment from a reply I got from Amphora
Society when I enquired to purchase the copper mesh.

------------------------------------
>One pound of mesh would be sufficient to pack one metre of 2 inch
>diameter column, so you would need two pounds to accomplish your aim
>of packing 1.5 metre. This would leave about 0.5 pound spare, but it
>should be noted that the top reflux condenser needs mesh inside if it
>is to function at full efficiency. It would therefore not be wasted.
------------------------------------

If this is true then I guess you would need more than 2 pounds to have
enough for a 3" column.

Regards
Surya

--- In Distillers@yahoogroups.com, "abbababbaccc" <abbababbaccc@...>
wrote:
>
> Here are some observation from 3" columns versus 2" stuff:
>
> On average you loose ~1% ABV when moving from 2" to 3" if all other
> parameters are kept equal. In practise thise means that HETP is
> increased by 50% using very rough estimation. This promotes the use of
> higher column to fix things. For height I'd recommend at least 1.5
> meters if you can afford it.
>
> Packing, as mentioned mesh rolls are recommended to avoid voids in
> packing.
>
> Product removal, for neutral alcohol VM and ARC are the best.
> Succesfull 3" columns have been built using both approaches.
>
> Power, 2kW to the column works well.
>
> Otherwise things are roughly the same as they are with 2" columns.
>
> Cheers, Riku
>
• Surya, This applies to reflux coil type condensers where you have large opening in the middle of the condenser. Filling this void with mesh slows down the
Message 5 of 21 , Dec 5 12:37 AM
Surya,

This applies to reflux coil type condensers where you have large
opening in the middle of the condenser. Filling this void with mesh
slows down the vapor flow and improves condenser efficiency thus
preventing vapor from escaping. Although it is not always needed it
does not hurt to fill that void just in case.

Cheers, Riku

--- In Distillers@yahoogroups.com, "surya9375" <surya9375@...> wrote:
>
>
> I would just like to adda comment from a reply I got from Amphora
> Society when I enquired to purchase the copper mesh.
>
> ------------------------------------
> >One pound of mesh would be sufficient to pack one metre of 2 inch
> >diameter column, so you would need two pounds to accomplish your
aim
> >of packing 1.5 metre. This would leave about 0.5 pound spare,
but it
> >should be noted that the top reflux condenser needs mesh inside
if it
> >is to function at full efficiency. It would therefore not be
wasted.
> ------------------------------------
>
> If this is true then I guess you would need more than 2 pounds to
have
> enough for a 3" column.
>
> Regards
> Surya
>
>
• Thanks guys again for the very good info, this is the sort of information I could not find in the archive. Donald, your post was interesting but I m not going
Message 6 of 21 , Dec 5 1:25 AM
Thanks guys again for the very good info, this is the sort of
information I could not find in the archive.

Donald, your post was interesting but I'm not going down that road,
the off take speed you mention is very fast! Thanks for your
thoughts.

Surya and Riku, both of you mention a reduction of purity, that part
I seemed to have missed in my reading, can some one point towards
but I don't think I seen it at home distiller?

To Riku, as I have mentioned, I like the ARC setup but where can I
find more detailed info that will match a 3" column to a 3 " set up?
I'm abit confused about the inside sencer tube compared to outside
stuff relating to this subject, sorry.

As far the condenser goes, I already have a shotgun condenser that
has about 6 meters of 6 mm copper tube in it. Copper packing, I
think about 4-5 pounds will do it?

Cheers Marc

--- In Distillers@yahoogroups.com, "abbababbaccc" <abbababbaccc@...>
wrote:
>
> Surya,
>
> This applies to reflux coil type condensers where you have large
> opening in the middle of the condenser. Filling this void with
mesh
> slows down the vapor flow and improves condenser efficiency thus
> preventing vapor from escaping. Although it is not always needed
it
> does not hurt to fill that void just in case.
>
> Cheers, Riku
>
> --- In Distillers@yahoogroups.com, "surya9375" <surya9375@> wrote:
> >
> >
> > I would just like to adda comment from a reply I got from Amphora
> > Society when I enquired to purchase the copper mesh.
> >
> > ------------------------------------
> > >One pound of mesh would be sufficient to pack one metre of 2
inch
> > >diameter column, so you would need two pounds to accomplish
your
> aim
> > >of packing 1.5 metre. This would leave about 0.5 pound spare,
> but it
> > >should be noted that the top reflux condenser needs mesh inside
> if it
> > >is to function at full efficiency. It would therefore not be
> wasted.
> > ------------------------------------
> >
> > If this is true then I guess you would need more than 2 pounds
to
> have
> > enough for a 3" column.
> >
> > Regards
> > Surya
> >
> >
>
• Reduced quality using larger columns have been shown in practise. I don t know whether anyone have actually written about it. My writings about ARC can be
Message 7 of 21 , Dec 5 5:15 AM
Reduced quality using larger columns have been shown in practise. I
don't know whether anyone have actually written about it.

My writings about ARC can be found at
http://distillers.tastylime.net/library/Listings2.htm#Books%
20Listings - Simple low cost stills

The internal sensor pipe has several advantages and is thus
recommended. You can use plans for smaller diameter column and make
measures a bit larger in proportion. Just make sure you won't
encounter flooding, i.e. calculate things according to the power you
plan on using.

Cheers, Riku

--- In Distillers@yahoogroups.com, "mavnkaf" <mavnkaf@...> wrote:
>
>
> Surya and Riku, both of you mention a reduction of purity, that
part
> I seemed to have missed in my reading, can some one point towards