7 ms·

Why would you do so when you have for free in the air? Then you would need the same amount of energy and the same process to make it liquid, since it's very imp

• dredmorbius 5y ago
  "Free in the air" is not pure in the air. As noted, the ozone process requires high-purity O2 as source stock. That's recovered from atmospheric air through one of several processes. My understanding is that cryogenic seperattion is the principle method (it's a bit like fractional distillation, but in reverse, seperating air into its constituent gasses based on their liquification temperatures). There's also pressure-swing absorption and membrane technology (differential diffusion), as well as by-product availability from other processes (e.g., nitrogen production). See: https://www.aceee.org/files/proceedings/2007/data/papers/78_6_080.pdf https://www.aceee.org/files/proceedings/2007/data/papers/78_... (I've known all this longer than you have. By as much as five minutes.)