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Originally Posted by bobkoure
Dare we ask what you are doing with -90C acetone? From the temp (just above acetone's freezing point) I'd guess it was important to have "acetone as cold as possible" rather than "some fluid that isn't gaseous at room temp/pressure and still liquid at -90C". So maybe preparing bio samples?
I'm also curious how you are getting it to -90. The easy/obvious/probably-wrong one is that you are simply boiling off nitrogen (too cold -200C or so - acetone freezes) or maybe dry ice (nah - too warm - only -75C or so) Some kind of condense/evap loop? Even that'd have to be somewhat exotic given the temp.
PS: I'm just curious - answers would satisfy my curiosity (and maybe some other folks here) bur probably won't net you any better answers than you've already got (I've no clue about what works with -90C acetone, except... maybe you should check out what the bio guys are doing to handle really-cold acetone - unless you are one of those bio guys and already know all about that...
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Maybe he's doing microfluidic chromatography? Those bio guys are always making their own systems because there really hasn't been a packaged solution for them yet.