Yeah, from what I've understood during my two years of coding for Linde gas* it should be based on boiling point.
I'd love to see a new machine and make it possible to have varying sizes for it. E.g 1x2 would be the most basic one that only gives you oxygen and nitrogen with relatively bad efficiency. Going to 3x3x4 would make it more efficient but still just O2+N2. Something huge like 5x5x8 would allow pumping in enough gases that separating rare stuff becomes possible (H2, Kr, Ne, He, Ar). Using higher levels of machine casings might allow for higher pressure in the tank and thus either improve efficiency or allow extracting more rare stuff in smaller towers.
Only problem would be what could we do with the rare gases
I guess argon could be used for some high-tech metalwroking. Neon and crypton for, well, neon lights.
You worked for linde? Hah, neat My father is the head-Engineer at one of the plants
Hmm, talking about Gasses... CYANIDE BIPRODUCT?
*Throws at greg* mwuahahahaha