Nitrogen, refrigerated liquid (cryogenic liquid)

Formula
N2
Structure
Description
Colorless odorless, cryogenic liquid. Very cold.
Uses
In manufacture of ammonia, nitric acid, nitrates, cyanides, etc & explosives, in filling high temperature thermometers, incandescent bulbs, to form an inert atmosphere for preservation of materials for use in dry boxes or glove bags, pharmaceutic aid (air displacement), liq: in food freezing processes & in laboratory as a coolant.

Registry Numbers and Inventories.
CAS
7727-37-9
EC (EINECS/ELINCS)
231-783-9
RTECS
QW9700000
RTECS class
Other
UN (DOT)
1977
Merck
12,6698
Beilstein/Gmelin
150 (G)
EPA OPP
128962
Swiss Giftliste 1
G-9567
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Korea ECL
Listed

Properties.
Formula
N2
Formula mass
28.01
Melting point, °C
-214.4
Boiling point, °C
-195.86
Vapor pressure, mmHg
2710 (-183)
Vapor density (air=1)
0.97
Odor Threshold Odor threshold Odorless
Critical temperature
-147.1
Critical pressure
33.5
Density
0.807 g/cm3 (20 C)
Solubility in water
Insoluble
Viscosity
156.3 mps (-21.5C)
Surface tension
6.6 g/s2 (-183 C)
Dipole moment
0 D
Partition coefficient, pKow
0.67
Thermal expansion
0.0042424/K (0 C)
Heat of fusion
0.72 kJ/mol
Heat of vaporization
5.57 kJ/mol

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
A
Handling
Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate protective gloves, clothing and goggles. Always wear thermal protective clothing when handling refrigerated/cryogenic liquids.
Respirators
Filter cartridge respirators are inadequate.
Small spills/leaks
Do not touch or walk through spilled material. Stop leak if you can do it without risk. If possible, turn leaking containers so that gas escapes rather than liquid. Do not direct water at spill or source of leak. Allow substance to evaporate. Isolate area until gas has dispersed.
Stability
Incombustible and unreactive.
Incompatibilities
Reacts violently in mixture with magnesium powder when a fuse is lit.

Fire.
Fire fighting
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Cool all affected containers with flooding quantities of water. Do not use water on material itself. Apply water from as far a distance as possible.
Fire potential
Noncombustible liquiduefied gas.
Hazards
Containers may explode when heated.
Health
3
 
Flammability
0
 
 
Reactivity
0
 

Health.
Poison_Class
-
Exposure effects
Rapid breathing and rapid heart rate are common. In severe cases abnormally low blood pressure, apnea, and cardiac arrest develop. Various disturbances including headache, dizziness, mood disturbances, numbness of the extremities, sleepiness, mental confusion, poor judgement and coordination, and memory loss may occur. Prolonged or severe hypoxia results in unconsciousness. Prolonged asphyxia may produce CNS injury. Hemiparesis has been reported with volatile substance abuse. Cerebral edema with brainstem herniation may occur. Seizures have been reported following intentional inhalation.
   Ingestion
None expected.
   Inhalation
Hyperventilation may develop. Vapors may cause dizziness or asphyxiation without warning. On loss of containment this liquid evaporates very quickly causing supersaturation of the air with serious risk of suffocation when in confined areas.
   Skin
Frostbite on contact with liquid.
   Eyes
Pain, severe deep burns.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Remove to fresh air; apply artificial respiration if breathing has stopped; call physician.
   Skin
If exposed to very cold gas, treat for frostbite; soak in lukewarm water.
   Eyes
If exposed to very cold gas, treat for frostbite burns caused by liquid.

Transport.
UN number
1977
Response guide
Hazard class
2.2
USCG CHRIS Code
NXX
 
Std. Transport #
4904566
 
IMO Gas Code
B