Per the AIAA Standard on hydrogen, the oxygen content in condensed air is
about 50%.
-R
On Sunday, September 25, 2016, John Dom <johndom@xxxxxxxxx> wrote:
No air separation azeotrope indeed:
http://www.linde-engineering.com/internet.global.
lindeengineering.global/en/images/AS.B1EN%201113%20-%20%
26AA_History_.layout19_4353.pdf
jd
-----Original Message-----
From: arocket-bounce@xxxxxxxxxxxxx <javascript:;> [mailto:
arocket-bounce@xxxxxxxxxxxxx <javascript:;>] On Behalf Of Evan Daniel
Sent: zaterdag 24 september 2016 23:09
To: arocket@xxxxxxxxxxxxx <javascript:;>
Subject: [AR] Re: More thoughts on the SpaceX disaster
On Sat, Sep 24, 2016 at 4:18 PM, Henry Spencer <hspencer@xxxxxxxxxxxxx
<javascript:;>> wrote:
...nitrogen will not condense...
Actually it will, if you get any condensation at all, because (loosely
speaking) it will dissolve in the condensing oxygen. What you get is
somewhat-oxygen-enriched liquid air, not straight oxygen. Still a
safety concern, yes.
To go into more detail: this is basically a distillation operation in
reverse. Each step provides a moderate amount of enrichment, if you want
reasonable purity you need things like multiple fractioning steps and
reflux and so on. You can find the composition of the liquid from the
composition of the air and a distillation chart. (Or by looking up vapor
pressure curves and doing some math with them and the relative
concentrations. I'm pretty sure there are no azeotropic or other weird
effects with O2 + N2 + Ar.)
Evan Daniel
