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I believe you should give the NASA folks a call for that.
Pretty shure that they considered this. I think nowadays they use
reusable Zelith molecular sieves / heated up to expel the CO2)
For this side of the pond, I'll  keep my eyes open.
regards
Matthias

Wendell Grogan schrieb:
> 
> Very interesting!  Are there any pictures of the insides of the tanks
> where the CO2 is crystallized out?
> Wendell G
> Matthias Voss wrote:
> >
> > Wendell, below is the link to a site where you find pics and a german
> > description of the russian cryostat.
> > It is an OC system, one might be tempted to think of using the cold to
> > freeze out CO2, in a rebreather.
> >
> > http://www.rz.unibw-muenchen.de/~j0bs0067/drdietmarberndt/index.htm
> >
> > Wendell Grogan schrieb:
> > > Thanks for the information about the russian system.
> > > As for the oxygen concentrators, this is actually a very new system.  It
> > > is in two parts.  The first is a typical oxygen concentrator that
> > > delivers about 2 to 6 liters per minute of 94% O2 at ambient pressure.
> > > The new thing is the second part which is a compressor that is designed
> > > specifically to be mated to the concentrator.  It boosts the pressure to
> > > about 200 bar.
> >
> > Very interesting.
> > I heard of a similar German system to do the same, but the company did
> > not reply to my mail.
> >
> > regards
> > Matthias
> >
> >  This can then be used to fill a standard oxygen tank.
> > > The flow rate is very slow which is why it takes 6 hours to fill a
> > > relatively small bottle, but that is also how it can be used in homes of
> > > people who don't know anything about oxygen handling.
> > > Haven't checked the prices yet.  But this is medical equipment so it
> > > isn't going to be cheap.
> > > Wendell
> > > >
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