How to remove moisture from nitrogen gas
emj...@sify.com
cooled to low temperature (100K). I use commercially available nitrogen
gas , which has water vapor and this water gets condensed in the
cavity. Can anyone suggest an effective method to dry the nitrogen gas
before sending into the cavity.
Mohmed Jamal
Farooq W
Some speculations: Why don't you design a trap which cools commerical
nitrogen gas to very low temperature before the gas is entered in the
cavity? Any water vapour would automatically condense in the trap or
for higher couple this trap with high effieciency adsorbents such as
alumina or anhydrous calcium chloride.
Christopher Kerr
Martin Pot
You could dry the gas with a nafion membrane gas dryer (Perma Pure LLC,
http://www.permapure.com).
--
Martin Pot (p...@xs4all.nl)
http://www.xs4all.nl/~pot
ultracrepidarian: (n., adj.)
a person who gives opinions
beyond his scope of knowledge.
N. Ron
in-line to your gas source? I am not sure what the dew point of the exit gas
would be (and whether it would match what you desire), but this should be a
cheap option and easy to try out.
Niles
<emj...@sify.com> wrote in message
news:1124619445.8...@g44g2000cwa.googlegroups.com...
James Copeland
Try a drying tube filled with magnesium perchlorate. This is a well-known
drying agent which is regenerable. It is probably the most thorough of the
solid drying agents. We used it a lot when we wanted really intense drying
of gases.
Jim C.
Carl Ijames
How about using the boiloff from a dewar of liquid nitrogen as your
source? I can't quote dryness specs but I have to believe that pretty
much any water will stay frozen in the dewar (check the vapor pressure
of water at 77 K if you want the lower limit of the water partial
pressure in the nitrogen gas). Depending on how much gas you are using,
it's also cheaper to buy the gas this way since one 160 L dewar is equal
to about 20 high pressure tanks of gas.
--
Regards,
Carl Ijames carl.ijames at verizon.net
dlzc1 D:cox T:net@nospam.com N:dlzc D:aol T:com (dlzc)
"Carl Ijames" <carl....@nospm.verizon.net> wrote in message
news:CF1Oe.6775$M3.1505@trnddc05...
> >I want to fill a cavity with nitrogen gas and the cavity is to
> >be
>> cooled to low temperature (100K). I use commercially available
>> nitrogen
>> gas , which has water vapor and this water gets condensed in
>> the
>> cavity. Can anyone suggest an effective method to dry the
>> nitrogen gas
>> before sending into the cavity.
>
> How about using the boiloff from a dewar of liquid nitrogen as
> your source? I can't quote dryness specs but I have to believe
> that pretty much any water will stay frozen in the dewar (check
> the vapor
> pressure of water at 77 K if you want the lower limit of the
> water
> partial pressure in the nitrogen gas).
This is a good idea as a first step. The ice does sublime
however, and you do get a small amount of water in the exit gas
stream.
Compressed gas cylinders are commonly rinsed with water
internally (or even just exposed to atmospheric air). If the
cylinders are not "baked", then refilled, they "breathe" water
out along with the decompressing gas. I had this problem with
oxygen...
David A. Smith
Uncle Al
Run the tank "dry" nitrogen through a preliminary dryer of activated
Drierite or 4A molecular sieves as necessary and desirable, followed
by a pipe loosely filled with clean steel or copper wool (surface
area, turbulence, and thermal conductivity) in a liquid nitrogen bath
(77 K). That will give you dry nitrogen at 100 K.
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz.pdf
Attila the Bum
requirements, but given your
name, perhaps the appropriate
technology would be to bubble
the gas through conc. sulfuric
acid.
Atty (Then there was the time ....)
