ORGLIST:Re: Everybody digest, Vol 2 #97 - 1 msg

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From: Devin Pantess (pantess$##$bellsouth.net)
Date: Tue Jul 20 2004 - 08:04:16 EDT


>Does any of you know of an efficient method to dry the gas prior to addition
to the raction mixture?

D.D. Perrin, Purification of Lab. Chemicals, 2nd Ed. Pergamon Press, 1980.

Passed over CuO wire at 800 deg. C to oxidize CO and other reducing impurities
(such as H2), then over copper dispersed on kieselguhr at 180 deg. C to
remove oxygen. Drying at -78 deg C removed water vapor. Final purification
was by vac. distn. at liquid-N2 temp. to remove non-condensable gases.
[Anderson, Best and Dominey, JCS, 3498, (1962)]
SO2 can be removed at 450 deg C using hot silver wool combined with a plug of
platinized quartz wool. Halogens are removed by using magnesium, zinc or
copper haeted to 450 deg. C.

Good Luck,

Devin
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