>Cryogenic distillation of air is a solved problem. There are plenty of plants already in operation all over the globe meaning there only needs to be modification to existing plants to further collect and crack the remaining 0.1% of air. I'm sure this is not hard to do with existing cryoplants.
It can take months or years to make additions to existing plants, there is an enormous amount of difference between a solved textbook problem and a real problem being solved.
It can take months or years to make additions to existing plants, there is an enormous amount of difference between a solved textbook problem and a real problem being solved.