Liquid Nitrogen Nitrogen is mainly found in the atmosphere, where it accounts for 78 % by volume of the air we breathe. Nitrogen can be supplied in cylinders, liquefied gas tanks, by on site generator or by pipeline. Typical nitrogen applications are: Industry Chemicals Application Nitrogen can be used for blanketing, as well as for: Storage for protecting raw materials or finished products in liquid form from the formation of peroxides and/or gum, and from contamination by oxygenated components; Regeneration of purification beds (alumina and molecular sieve); Preparation of catalysts and transportation of polymer powders; Medium for the exhaust of emitted heat in fluid bed reactors; and Temperature control in reactors. Nitrogen is used for inerting, cryo-grinding, lyophilisation, drying, liquid phase transfer of products or synthesis intermediates; cryo-condensation of waste gases and low temperature storage. Liquid nitrogen: N2 is the most used cryogenic fluid, to chill, freeze or store food products. Gaseous nitrogen: N2 is very commonly used in contact with foodstuffs to avoid oxidation or micro-organism growth by inerting of liquids. Modified Atmosphere Packaging (MAP) preserves and protects foods (pure nitrogen or mixed with CO2). Glass Nitrogen is used as an inert gas especially to create, in combination with hydrogen, a reductive atmosphere over the tin bath in the float glass process. Low-temperature preservation of living tissues and cells. Nitrogen is used as a carrier gas in gas chromatography for various industrial and hospital analyses and quality control. Nitrogen is the balance gas of the calibration gas mixtures for environmental monitoring systems and industrial hygiene gas mixtures. Nitrogen is largely used as purge, dryier or blanket gas for analyzers or chemical reactors (under gaseous state or at low temperature liquid state). Heat treatment of various metals. Nitrogen is a component of the special mixtures used in
Food and Beverage
Welding and Cutting
CO2 lasers. Oil and Gas Electronics Quality protection of products and facilities. Nitrogen is used as carrier gas for overall protection against impurities and oxidation in semiconductor and soldering processes. In its cold and liquid form, N2 is used as a cooling medium in the environmental testing of electronic devices. Gas Assisted Injection Moulding requires pressures between 10 bar (145 psi) and 200 bar (2900 psi) and a nitrogen content of between 98.0 % and 99.9 %. Tires filling with nitrogen increase their lifetime and therefore decreases the recycling or treatment of this waste.
Key Facts on Nitrogen Molecular weight Melting point Latent heat of fusion (1,013 bar, at triple point) Liquid density (1.013 bar at boiling point) Liquid/gas equivalent (1.013 bar and 15 °C (59 °F)) Boiling point (1.013 bar) Latent heat of vaporization (1.013 bar at boiling point) 28.0134 g/mol -210 °C 25.73 kJ/kg 808.607 kg/m3 691 vol/vol -195.9 °C 198.38 kJ/k