Re: air separation

On Wed, 28 Sep 2005 20:56:25 +0200, Bernhard Kuemel
<spamtrap@xxxxxxxx> etched in cyberspace:

>Uncle Al wrote:
>>>Any other simple and cheap methods to make O2/N2?
>>
>> Diffuse through a silicone rubber membrane. Cryogenic fractional
>> distillation. Pressure swing absorption into Co-SALEN and fluorinated
>> analogues. Countercurrent separation with a paramagnetically-doped
>> molecular sieve.
>
>I tried making a Linde air liquefier but it didn't work. No
>noticable temperature drop. I used a compressor from a fridge. So
>this one is not simple. Maybe a 200 bar compressor wourd work, but
>that would fail the cheap requirement.
>
>Somehow I doubt that your other suggestions are cheap and simple.
>
>Bernhard
The silicone rubber membrane sounds fairly low cost,
but if you set it up no dought you will have to diffuse many times to
gradually increase the separation.
Pehaps even diffusing through a shheet of cardboard or a roll of
toilet paper would achive some separation.

Another way would be to reversibly absorb O2 onto blood.
If you talk to an abatoir they would sell you some!

You may be able to do a reversible perooxide or superoxide reation
with K2O or Cs2O
X X
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