--- In Distillers@yahoogroups.com
> Hi Harry.
> Yes, I think I've to speak with somebody in my native language,
> > Only a thing: I have (at least, I think to have) also some
> > condensing on the lower plates.
> > In my opinion I have a temperature gradient along the column: so
> > upper-boiling components that leave the boiler have a
> > when they bump on a relatively cold plate. Such in this way I get
> > partial purification of the vapours that climb along the column,
> > isn't it?
> ................You are correct. But the reason is the surrounding
> air removes some of the heat from the column.
> ........As I said before, you have a good potstill for grappa. DO
> NOT INSULATE the column, unless you want the grappa to be heavier
> tails. It is a good balance between heating and air cooling, and it
> allows a little more reflux to make the grappa cleaner. It works
> similar to the old Scotch potstills or the French brandy stills,
> except you have a little more control with the water tube in the
> If you insulate the column, the grappa distillate will be heavier
> with impurities and taste much different. Try both ways and you
> will see the difference. If you don't like it, you can always re-
> distill it.
> So, I agreed with you and I did what you said: I had the idea that
> insulating a column give an heavier product and a not insulated
> column give a purer product.
> Is something changed? ========================
Ok, one more try.
Nothing has changed, Micio. You are talking about and confusing two
different types of stills and their different columns.
You have a potstill. A potstill allows ONE PLATE to happen in one
length of column. A potstill MUST BE UN-INSULATED to get reflux
[Potstill NO Insulation] = Some Reflux = Some Separation (1 plate) =
Less nasties in your product.
[Potstill WITH Insulation] = No reflux = No separation = More
nasties in your product.
A Reflux Still is a PACKED COLUMN. A packed column allows MANY
PLATES to happen in one length of column.
[Reflux Still WITH Insulation] = reflux = separation (many plates) =
much less nasties in the product.
[Reflux Still NO Insulation] = less reflux = less separation (many
plates) = more nasties in the product.
That's all I can give you, Micio. You will need to build and
operate a reflux column in order to understand the differences in
how they work.