Oxygen, liquid

  • Oxygen, refrigerated liquid (cryogenic liquid)
  • Liquid oxygen
  • LOX
Formula
O2
Structure
Description
Oxygen is a colorless, odorless and tasteless gas. As a non-liquid gas it is shipped at pressures of 2000 psig or above. As a liquid, it has a pale blue color.
Uses
Manufacture of synthesis gas for prodn of ammonia, methyl alcohol, acetylene, etc, to counteract effect of eutrophication in lakes & reservoirs, coal gasification.

Registry Numbers and Inventories.
CAS
7782-44-7
EC (EINECS/ELINCS)
231-956-9
EC Index Number
008-001-00-8
EC Class
Oxidizing
RTECS
RS2060000
RTECS class
Mutagen; Reproductive Effector; Human Data
UN (DOT)
1073
Merck
12,7098
Beilstein/Gmelin
485 (G)
Swiss Giftliste 1
G-6770
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Korea ECL
Listed

Properties.
Formula
O2
Formula mass
31.99
Melting point, °C
-218.8
Boiling point, °C
-183.17
Vapor pressure, mmHg
1905 (-173 C)
Vapor density (air=1)
1.105
Evaporization number
High
Odor Threshold Odor threshold Odorless
Critical temperature
-118.95
Critical pressure
50.14
Density
1.14 g/cm3 (-183 C)
Solubility in water
0.04 g/L (25 C)
Viscosity
0.020 75 cp (gas: 1 atm at 25C)
Surface tension
13.47 g/s2
Refractive index
1.2518 (-208 C)
Dipole moment
0.154 D
Dielectric constant
1.465
Partition coefficient, pKow
-0.53
Heat of fusion
0.45 kJ/mol
Heat of vaporization
6.8 kJ/mol

Hazards and Protection.
Storage
Extremely cold oxidizing liquid and gas. Vigorously accelerates combustion. Contact with liquid or cold gas causes severe frostbite. Combustibles with liquid air may explode on ignition or contact. Keep oil, grease, and combustibles away. Use only with equipment conditioned for oxygen service. Use piping and equipment adequately designed to withstand the pressures and temperatures to be encountered. Do not get liquid in eyes, on skin or clothing. Store and use with adequate ventilation. Close valve when not in use and when empty. Clothing exposed to liquid air should be removed immediately and aired out to reduce the likelihood of an engulfing fire. Ignition sources, such as static electricity generated in clothing by walking, etc., should be prevented. Protect container against physical damage. Isolate from combustible gas installations and combustible materials by adequate distance or by gas-tight, fire resistive barriers.
A C
Handling
Use piping and equipment adequately designed to withstand pressures to be encountered. Ground all equipment. Store and use with adequate ventilation at all times. Use only in a closed system.
Protection
Safety goggles and loose-fitting cryogenic gloves. Metatarsal shoes for cylinder handling. Protective clothing where needed. Cuffless trousers should be worn outside the shoes.
Respirators
None required under normal use. However, air-supplied respirators are required while working in confined spaces with this product. Respirators should be approved by NIOSH and MSHA.
Small spills/leaks
Extremely cold oxidizing liquid and gas. Immediately evacuate all personnel from danger area. Allow spilled liquid to evaporate. Do not walk on or roll equipment over spill as this could cause explosion. Contact with flammable materials may cause fire or explosion. Shut off leak if without risk. Ventilate area of leak or move leaking container to ventilated area.
Stability
No data.
Incompatibilities
All flammable materials, especially petroleum products.
Decomposition
None.

Fire.
Fire fighting
Dangerously explosive. 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
Substance does not burn but will support combustion.
Hazards
Oxidizing agent, vigorously accelerates combustion. Contact with flammable materials may cause fire or explosion. Closed container may rupture due to heat of fire. Liquid will freeze water rapidly. Containers are provided with pressure relief devices that are designed to vent the contents when they are exposed to elevated temperatures. Do not walk on or roll equipment over spill as this could cause explosion. Liquid causes cryogenic “ burns” (frostbite-like injury). Smoking, flames, and electric sparks in the presence of enriched oxygen atmospheres are potential explosion hazards.
Health
3
 
Flammability
0
 
 
Reactivity
2
 
 
Special
O

Health.
Poison_Class
-
Exposure effects
Significant dermal exposure to the escaping compressed gas or liquid oxygen may cause reduced body temperature. Seizures - central nervous system involvement in hyperbaric situations may pose a significant threat to safety.
   Ingestion
This product is a gas at normal temperature and pressure. An unlikely route of exposure, but frostbite of the lips and mouth may result from contact with the liquid.
   Inhalation
Breathing 80% or more oxygen at atmospheric pressure for more than a few hours may cause nasal stuffiness, cough, sore throat, chest pain and breathing difficulty. Breathing oxygen at higher pressure increases the likelihood of adverse effects within a shorter time period. Breathing pure oxygen under pressure may cause lung damage and also central nervous system effects resulting in dizziness, poor coordination, tingling sensation, visual and hearing disturbances, muscular twitching, unconsciousness and convulsions. Breathing of oxygen under pressure may cause prolongation of adaptation to darkness and reduced peripheral vision.
   Skin
No harm expected from vapor. Liquid may cause frostbite.
   Eyes
No harm expected from vapor. Liquid may cause frostbite.

First aid
 
   Ingestion
Unlikely route of exposure - because oxygen is a gas at ambient temperatures, ingestion is an unlikely route of exposure.
   Inhalation
In all but the most severe cases (pneumonia), recovery is rapid after reduction of oxygen pressure; supportive treatment should include immediate sedation, anticonvulsive therapy if needed, and rest.
   Skin
Treat frostbite; soak in lukewarm water.
   Eyes
Treat frostbite burns.

Transport.
UN number
1073
Response guide
Hazard class
2.2
USCG CHRIS Code
OXY
 
Std. Transport #
4904360