In the chemical industry it is used to dilute reagent gases and to increase the yield of some reactions. It decreases the risk of fire, explosion and some several other reactions. It  prevents and decreases oxidation and product hydrolysis.

In the pharmaceutical industry it is used as a shield gas in the packing of some medicines to prevent degradation by oxidation or moisture adsorption. It helps cooling reactors (and the materials inside) to operate at lower temperatures, which allows for better control of side-reactions in complex reactions.

Petroleum processing industry, refineries, petrochemical plants and marine tankers use nitrogen to purge their equipment, tanks and pipelines of dangerous vapors and gases. For example: after completing a pipeline transfer operation or ending a production run, Nitrogen is used to maintain an inert and protective atmosphere in tanks storing flammable liquids.

The steel industry uses Nitrogen to treat the melt in the manufacture of steel and other metals. It is used as a shield gas in the heat treatment of iron, steel and other metals.  It is also used as a "process gas" together with other gases, for reduction of carbonization and nitriding. 

Healthcare uses it as a component in many gas mixtures and as a displacement medium for the sterilization of medical and surgical equipment. It is also used as a non-oxidizing displacement medium in pharmaceutical vials and as a propellant in pressurized aerosol dispensers. Medical nitrogen provides a source of pneumatic pressure for powering gas-operated medical/ surgical devices and as a coolant for carbon dioxide surgical lasers.

Generating Nitrogen Gas is economical and can be easily generated with your air compressor.