Oxygen plant is an industrial facility that is designed to produce high-purity oxygen gas through the process of air separation. The plant typically uses cryogenic distillation technology to separate the various components of air, such as nitrogen, argon, and oxygen.

Oxygen plant works by purifying air through the process of air separation. The air is compressed and cooled, and then passes through a molecular sieve where nitrogen and other trace gases are adsorbed, leaving behind pure oxygen. The pure oxygen is then liquified and stored in large tanks, where it can be filled into cylinders or used for industrial processes. Some oxygen plants also have the ability to produce high-purity oxygen for medical applications.

The purity level of oxygen produced by an oxygen plant can vary depending on the process and technology used. However, most modern oxygen plants can produce oxygen with a purity level of over 99%. This means that the oxygen produced is almost pure oxygen and is free from other gases and impurities.