An air separation unit splits atmospheric air into core components including nitrogen, oxygen and argon via cryogenic distillation. The full process compresses, purifies and chills air down to cryogenic temperature, then separates components inside a double-tower system. It can manufacture high-purity oxygen (up to 99.9%), ppm-grade nitrogen, as well as rare gases such as argon, neon and krypton. Modern ASUs adopt advanced heat exchangers, turboexpanders and molecular sieve purification to lift overall energy efficiency. Gaseous or liquid finished gas products are widely supplied to steelmaking, chemical synthesis, electronics, medical care and food preservation industries.