Back to Science class!
Vacuum- I have worked very little with vacuum. While in the Navy, I was
learning OJT a little about refrigeration. At that time I was taught inches of
Hg. and 30"Hg is the max but extremely hard or impossible to achieve.
5 deg. C = 6.5mm Hg -------- .25"Hg
55 deg. C = appr. 110 mm
Hg----4.33"Hg
If H2O is 18 and Hg is 200.59, Hg is 11.14 time heavier
.25" Hg = 2.785 " water
4.33" Hg = 48.24 " water
Where does micron come in?
Dave Miller spoke of an old scientific pump you had that went to 002mm Hg.
Scientific pump suggests to a very good pump, but .002 sounds like very little
vacuum. (unless zero is not the same place). He also mentioned I should look for
a 50? I am sure this will become quite clear, but now, it's not sinking
in.
Thanks John
----- Original Message -----
Sent: Wednesday, January 11, 2006 2:00
PM
Subject: Re: [Biofuel] Dewatering with
vacuum.
David Miller wrote:
Snip
>Somebody had
the vapor pressure tables for water earlier in this thread,
>maybe he
could look up the pressure for 55 and 5 degrees C.
>
>---
David
>
>
5 deg. C = 6.5mm Hg
55 deg. C =
appr. 110 mm Hg
It means that water does not have to be removed from
the trap (as was
stated ) since water at 5 deg.C has a vapour pressure low
enogh as not
to interfere with drying the fuel. It will never be perfectly
dry and
even if you could, it would adsorb water from the air when you
take it
out of the vacuum chamber. In practical terms just run cold
water
through your condenser and when the vacuum in the reactor gets to
27" Hg
or better you are done! I do it all the time. It works
well. I reheat
the reactor during washing and after draining the last wash
the vacuum
is started. An hour later the fuel is dry, crystal clear
and ready to
use.
Joe
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