Nitrogen trioxide

  • Nitrogen oxide
  • Dinitrogen trioxide
  • Nitrogen sesquioxide
  • asym-Dinitrogen trioxide
Formula
N2O3
Structure
Description
A blue liquid (under pressure) with a sharp, unpleasant chemical odor. Partially dissociates into NO and NO2.
Uses
Used in special purpose fuels.

Registry Numbers and Inventories.
CAS
10544-73-7
EC (EINECS/ELINCS)
234-128-5
UN (DOT)
2421
Beilstein/Gmelin
1811 (G)
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
N2O3
Formula mass
76.01
Melting point, °C
-111
Boiling point, °C
-27
Vapor pressure, mmHg
5000 (20 C)
Density
1.783 g/cm3 (1.782 -195 C)
Solubility in water
Very soluble

Hazards and Protection.
Storage
Protect sylinders from physical damage. Keep in a cool, dry, well-ventilated location.
Handling
Use only in a well-ventilated area. Cylinders must be properly secured.
Protection
Wear appropriate chemical protective clothing.
Respirators
Wear positive pressure self-contained breathing apparatus.
Small spills/leaks
Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Attempt to stop leak if without undue personnel hazard. Use water spray to knock-down vapors.
Stability
Stable when in a properly sealed cylinder.
Incompatibilities
Reacts with reducing agents to generate heat and products that may be gaseous (causing pressurization of closed containers) Incompatible with phosphorus, or other reduced materials Reactivity likely to resemble that of nitrogen dioxide and nitrogen tetraoxide.
Decomposition
Nitric oxide, nitrogen dioxide.

Fire.
Fire fighting
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Use water in flooding quantities as fog. Use alcohol foam, dry chemical or carbon dioxide. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible. Keep run-off water out of sewers and water sources.
Fire potential
Substance does not burn but will support combustion.
Hazards
Vapors from liquefied gas are initially heavier than air and spread along ground. These are strong oxidizers and will react vigorously or explosivelywith many materials including fuels. May ignite combustibles (wood, paper, oil, clothing, etc.). Some will react violently with air, moist air and/or water. Containers may explode when heated. Ruptured cylinders may rocket.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases.
Health
3
 
Flammability
0
 
 
Reactivity
0
 
 
Special
O

Health.
Exposure effects
The toxological properties of this substance have not been fully investigated.
   Ingestion
Unlikely route of exposure.
   Inhalation
May be fatal if inhaled. Causes irritation/burns.
   Skin
May be fatal if absorbed through the skin. Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
   Eyes
Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult. Effects may be delayed.
   Skin
Remove and isolate contaminated clothing and shoes. Immediately flush with running water for at least 20 minutes. In case of contact with liquefied gas, thaw frosted parts with lukewarm water. Effects may be delayed.
   Eyes
Immediately flush with running water for at least 20 minutes. Effects may be delayed.

Transport.
UN number
2421
Response guide
Hazard class
2.3
PRTC
T
Std. Transport #
4920175