Carbon monoxide

  • Monoxide
  • Carbon oxide
  • Carbonic oxide
  • Carbon monoxide, compressed gas
Formula
CO
Structure
Description
A colorless odorless gas.
Uses
Reducing agent in metallurgical operations, fischer-tropsch processes for petroleum-type products, manufacture of metal carbonyls.

Registry Numbers and Inventories.
CAS
630-08-0
EC (EINECS/ELINCS)
211-128-3
EC Index Number
006-001-00-2
EC Class
Extremely flammable; Toxic for reproduction Category 1; Toxic
RTECS
FG3500000
RTECS class
Mutagen; Reproductive Effector; Human Data
UN (DOT)
1016
Merck
12,1861
Beilstein/Gmelin
421 (G)
Swiss Giftliste 1
G-1919
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
CO
Formula mass
28.01
Melting point, °C
-205
Boiling point, °C
-191.5
Vapor pressure, mmHg
49.368 (-209 C)
Vapor density (air=1)
0.968
Odor Threshold Odor threshold Odorless
Critical temperature
-140
Critical pressure
35
Density
0.791 g/cm3 (20 C)
Solubility in water
23 g/L
Surface tension
9.8 g/s2 (liquid at 80 K)
Heat of fusion
0.8 kJ/mol
Heat of vaporization
6.0 kJ/mol
Heat of combustion
-283 kJ/mol

Hazards and Protection.
Storage
Store in a cool, dry, well-ventilated location. Separate from alkali metals. Remove the sources of ignition. Electric installation should be explosion-proof construction. Protect container against sunlight, and store in well-ventilated, safe areas.
Handling
All chemicals should be considered hazardous. 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 -- as recommended by the manufacturer. Always wear thermal protective clothing when handling refrigerated/cryogenic liquids.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Attempt to stop leak if without undue personnel hazard. Use water spray to knock-down vapors.
Stability
Stable - severe hazard when exposed to heat or flame.
Incompatibilities
Reacts explosively with bromine trifluoride at high temperatures or concentrations Reacts with lithium to give lithium carbonyl, which detonates violently with water, igniting the gaseous products.

Fire.
Flash Point,°C
-191
Autoignition, °C
609
Upper exp. limit, %
74
Lower exp. limit, %
12.5
Fire fighting
Do not extinguish fire unless flow can be stopped. Use water in flooding quantities as fog. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.
Fire potential
Extremely - combustion imminent. Very flammable.
Hazards
EXTREMELY FLAMMABLE. May be ignited by heat, sparks or flames. Flame may be invisible. Containers may explode when heated. Vapor explosion and poison hazard indoors, outdoors or in sewers. Vapors from liquefied gas are initially heavier than air and spread along ground. Vapors may travel to source of ignition and flash back. Runoff may create fire or explosion hazard.
Combustion products
Asphyxiation due to carbon dioxide production may result.
Health
4
 
Flammability
2
 
 
Reactivity
0
 

Health.
Exposure limit(s)
OSHA PEL: TWA 50 ppm (55 mg/m3) NIOSH REL: TWA 35 ppm (40 mg/m3) C 200 ppm (229 mg/m3) NIOSH IDLH: 1200 ppm
Poison_Class
3
Exposure effects
Acute effects include headache, syncope, seizures, dizziness, confusion and coma. Delayed effects may occur days to weeks after exposure; advanced age and neurologic anomalies during the acute event appear to be risk factors. 1. Severe effects may include mental deterioration, disorientation, hypokinesia, mutism, confusion, severe memory loss, coma, gait disturbances, incontinence, speech disturbance, tremor, visual loss, movement disorders, and parkinsonian syndrome. 2. Subtle effects may include headache, anorexia, nausea, apathy, lethargy, forgetfulness, personality changes, memory problems, irritability and dizziness. CO exposure during pregnancy is teratogenic, depending upon the stage of pregnancy. The fetus is more vulnerable to CO poisoning than the mother.
   Ingestion
Nausea and vomiting are common; may mimic acute gastroenteritis or food poisoning.
   Inhalation
Tachypnea is common. Respiratory failure, dyspnea, or pulmonary edema may occur.
   Skin
Bullous lesions associated with carbon monoxide poisoning generally appear within 24 hours of exposure and are usually located on the palms and soles.
   Eyes
Visual field deficits, retinopathy, or retrobulbar neuritis are late findings.

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.
   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.
   Eyes
Immediately flush with running water for at least 20 minutes.

Transport.
UN number
1016
Response guide
Hazard class
2.3
PRTC
T
USCG CHRIS Code
CMO
 
Std. Transport #
4920511