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PostPosted: Aug 05, 2014 3:33 am 
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Joined: Feb 25, 2011 1:55 am
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This popped up in my tech research feeds today. Apparently a weird MOF arrangement that can capture noble gases well and somewhat suited to capturing radioactive noble gases allegedly.

Separation of rare gases and chiral molecules by selective binding in porous organic cages
http://www.nature.com/nmat/journal/vaop/ncurrent/full/nmat4035.html

http://www.nuclearpowerdaily.com/reports/A_noble_gas_cage_999.html


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PostPosted: Aug 05, 2014 4:16 am 
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Joined: Jul 14, 2008 3:12 pm
Posts: 5061
Asteroza wrote:
This popped up in my tech research feeds today. Apparently a weird MOF arrangement that can capture noble gases well and somewhat suited to capturing radioactive noble gases allegedly.

Separation of rare gases and chiral molecules by selective binding in porous organic cages
http://www.nature.com/nmat/journal/vaop/ncurrent/full/nmat4035.html

http://www.nuclearpowerdaily.com/reports/A_noble_gas_cage_999.html


Most of this has been known for some time.

Quote:
The conventional way to remove xenon from the air or recover it from nuclear fuel involves cooling the air far below where water freezes. Such cryogenic separations are energy intensive and expensive.


This isn't much of an argument. I've run the numbers, its nothing. The Xe and Kr flow are just very small, even if diluted, say 1000:1 with inert gas (nitrogen/helium etc.).

Where higher temperature approaches shine is in the cooldown time. For MSRs, fighting the heat of Xe133, Xe137 etc. decay is tough when you must cool to cryogenic temperatures. A membrane or molecular sieve approach would work at much higher temperatures. Ideally we'd operate near room temperature or a few hundred degrees C or so, then we'd be able to deal with transient heatup without loss of system function, in an emergency.

"organic" is a major concern for me. We know radiation breaks any organic molecule apart and the temp resistance isn't briljant either. It would have to be semi-organic, like special fluoropolymers.

I'm more interested in silica/silicious ceramic membranes. I've designed a conceptual ceramic membrane cascade that has a high theoretical separation factor and works at high temperature. It is, of course, theoretical.


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