Air Separation Unit

An air separation plant separates atmospheric air into its primary components, typically nitrogen, oxygen, argon, and inert gases. There are various technologies that are used for the separation process, the most common is via cryogenic distillation. This process was pioneered by Dr. Carl von Linde in the early 20th century and is still used today to produce high purity gases. In addition to the cryogenic distillation method there are other methods such as Membrane, Pressure Swing Adsorption (PSA) and Vacuum Pressure Swing Adsorption (VPSA), which are typically used to separate a single component, such as oxygen, from ordinary air.

The Cryogenic Process
Distillation Column
The process consists of 3 stages as outlined below:

Atmospheric air is pre-filtered, compressed and then subsequently cooled to remove large size particles and moisture ——design of air separation plant in chengdu, sichuan province,PRC
The process air is passed through a molecular sieve, which removes any remaining water vapour, carbon dioxide and hydrocarbons in alternating absorption of units.
chengdu cryogenic equipement company, sichuan provice, china
Process air is passed through a heat exchanger and cooled. The refrigeration energy is provided by an expansion brake turbine. The process air enters into a distillation column where it is separated into pure nitrogen, pure oxygen and residual gas.

Air separation is used on nitrogen plants, oxygen plants and argon plants as well as in other industrial technologies.