How DRDO's tech comes in handy to ramp up medical oxygen output

The compressed air is expanded in a turbine so that refrigeration is produced.

Industrial gases are literally produced out of thin air, with no raw material required. Since atmospheric air comprises 78 per cent nitrogen and 21 per cent oxygen, with other gases accounting for one per cent, deriving these products separately requires a process that uses compression, freezing and separation technologies.
 
With the demand for medical oxygen soaring in the country, Tata Advanced Systems Limited and Trident Pneumatics intend to use technology developed by the Defence Research and Development Organisation (DRDO) for fighter jets to set up the pressure swing adsorption (PSA) technique and molecular sieves (zeolite) to generate oxygen directly