The following was posted to CCD-world:
On Mon, 8 May 2000 fhh at nofs.navy.mil wrote:
> Second note: I'm not particularly aware that zeolite is a good getter
> for water at temperatures higher than 124 K. It clearly works in LN2
> cryostats, but all of the "pros" I know working with warmer systems,
> and some with LN2 or colder systems, prefer activated charcoal. For
> your application activated charcoal would not be useful, since it
> releases its water load at room temp.
I have seen (Peltier cooled systems, I think) where both charcoal and
Zeolite was used for this very reason. The charcoal was attached to the
cold surface while the Zeolite container was kept at room temperature and
made detachable (a simple pipe-thread screw fitting) to enable easy
removal and re-generation.
> Scientific American did a nice article on zeolites back in the '70s, I
> kept that issue at home just for that article. Many zeolites are
> tailored for petroleum refining.
Please note down the date of this issue and post it here, next time you
have a chance.
Thanks
Willie
Mr. W.P. Koorts ( wpk at saao.ac.za )
South African Astronomical Observatory
PO Box 9 Observatory 7935 South Africa
Tel.(27) (21) 447 0025 Fax.(27) (21) 447 3639
World Wide Web ( Work ) http://www.saao.ac.za
World Wide Web ( Personal ) http://www.saao.ac.za/~wpk/
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