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Liquid nitrogen

  
 
Description
Nitrogen is colorless, odorless, tasteless, nontoxic, inert and represents 78.08 percent of the atmosphere. Nitrogen is nonflammable and does not support combustion. It is slightly soluble in water and most other liquids. Nitrogen does not conduct heat and electricity well.



Applications
1- For blanketing, inerting
a) Purging of air-conditioners, refrigerators, electronic devices, high-voltage compression cables and pipelines
b) Suppression, purging and inertization of reactors and tanks
2- As a reducing gas to provide and oxygen free atmosphere
3- Manufacture of synthetic fibers
4- Petrochemicals
5- Pipeline purging
6- Liquid nitrogen is used for cooling of concrete, cooling of electronic equipment, pulverizing plastics and simulating the conditions in outer space
7- Liquid nitrogen can be used for freezing of liquids in pipelines for emergencies, low temperature stabilization and hardening of metals



PHYSICAL AND CHEMICAL PROPERTIES
Appearance : Liquefied gas. Colorless. Odor : No odor warning properties. Odor threshold : No data available. pH : Not applicable. Melting point/range : -346 °F (-210 °C) Boiling point/range : -321 °F (-196 °C) Flash point : Not applicable. Evaporation rate : Not applicable. Upper/lower explosion/flammability limit : No data available. Vapor pressure : Not applicable. Water solubility : 0.02 g/l Relative vapor density : 0.97 (air = 1) Relative density : 0.8 (water = 1) Partition coefficient (noctanol/water) : Not applicable. Auto-ignition temperature : No data available. Nitrogen (Refrigerated) Decomposition temperature : No data available. Viscosity : Not applicable. Molecular Weight : 28 g/mol.



Hazards & Transportation
Hazard Statements
Nitrogen (Refrigerated) H281: Contains refrigerated gas; may cause cryogenic burns or injury. May displace oxygen and cause rapid suffocation.
Major Hazard: high temperature and suffocation
Toxicity: nontoxic
Fire Potential: nonflammable
Odor: none
DOTE Name: nitrogen
DOT Label: nonflammable gas
Identification No.: UN-1066 (compressed gas)
                                UN-1977 (refrigerated liquid)
Hazard Class/Division: 2.2
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