NITROGEN is a chemical element with symbol N and atomic number 7. It is the lightest pnictogen and at room temperature, it is a transparent, odorless diatomic gas. Nitrogen is a common element in the universe, estimated at about seventh in total abundance in the Milky Way and the Solar System. On Earth, the element forms about 78% of Earth’s atmosphere and as such is the most abundant uncombined element.
There are basic Two Production technologies for Nitrogen Production

PSA-Based Nitrogen Plant

PSA Oxygen Plant use pressures swing absorption method for separating nitrogen from air.the system operates over ambient temperature with working pressure up to 415 bars(G).
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Cryogenic Oxygen Nitrogen Plant

A cryogenic plant uses fractional distillation of liquid air technique to separate Oxygen and Nitrogen due to their boiling point difference. The Oxygen and Nitrogen thus obtained is directly filled to a cylinder with the help of  Separate pumps.