Phosgene

  • Carbon oxychloride
  • Chloroformyl chloride
  • Carbonic dichloride
  • Carbonyl chloride
Formula
Cl2CO
Structure
Description
Colorless gas, colorless to yellow compressed, liquified gas. Characteristic odor.
Uses
For the preparation of many organic chemicals, as a war gas.

Registry Numbers and Inventories.
CAS
75-44-5
EC (EINECS/ELINCS)
200-870-3
EC Index Number
006-002-00-8
EC Class
Very toxic; Corrosive
RTECS
SY5600000
RTECS class
Human Data
UN (DOT)
1076
Merck
12,7491
Beilstein/Gmelin
1098367
Beilstein Reference
4-03-00-00031
RCRA
P095
Swiss Giftliste 1
G-2049
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
CCl2O
Formula mass
98.92
Melting point, °C
-118
Boiling point, °C
8
Vapor pressure, mmHg
1200 (20 C)
Vapor density (air=1)
3.4
Odor Threshold Odor threshold 0.5 ppm
Critical temperature
182
Critical pressure
55.30
Density
1.432 g/cm3 (0 C)
Solubility in water
Slightly soluble
Viscosity
0.00011 P (0 C)
Surface tension
34.6 g/s2 (0 C)
Dipole moment
1.1 D
Dielectric constant
4.338 (22 C)
Partition coefficient, pKow
1.47
Thermal expansion
0.oo1696/K (10 C)
Heat of fusion
5.7 kJ/mol
Heat of vaporization
30.8 kJ/mol
Heat of combustion
-175 kJ/mol

Hazards and Protection.
Storage
Store at in cool ventilated area.
A D1A E
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.
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. Land spill: Dig a pit, pond, lagoon, holding area to contain liquid or solid material. Dike surface flow using soil, sand bags, foamed polyurethane, or foamed concrete. Neutralize with agricultural lime (CaO), crushed limestone (CaCO3) or sodium bicarbonate (NaHCO3). Dilute slowly with water. Water spill: Neutralize with agricultural lime (CaO), crushed limestone (CaCO3), or sodium bicarbonate (NaHCO3).
Stability
Decomposes on heating above 300 C.
Incompatibilities
Incompatible with strong oxidizing agents, alcohols, amines, alkali May react violently with aluminum, alkali metals (lithium, potassium, sodium), alcohols (isopropyl alcohol, 2,4-hexadiyn-1,6-diol), sodium azide May react vigorously or explosively
Decomposition
Hydrogen chloride, carbon monoxide and chlorine fumes.

Fire.
Fire fighting
If necessary to stop flow of gas, use water spray to protect the personnel effecting shutoff. Sodium hydroxide or anhydrous ammonia have been used to neutralize phosgene.Nonflammable. For small fires, use dry chemical or carbon dioxide. Use water spray, fog, or foam for larger fires. Do not get water inside containers. Move container from fire area if you can do so without risk. Stay away from the ends of tanks, and cool exposed containers with water until well after the fire is out. Isolate the area until gas has dispersed.
Fire potential
Noncombustible
Hazards
When heated to decomposition or on contact with water or steam, it will react to produce toxic and corrosive fumes. Reacts violently with aluminum; tert-butyl azido formate; 2,4-hexadiyn-1,6-diol; isopropyl alcohol; potassium; sodium; hexafluoro isopropylidene; amino lithium; lithium. Stable in steel containers if dry. Avoid moisture.
Health
4
 
Flammability
0
 
 
Reactivity
1
 

Health.
Exposure limit(s)
NIOSH REL: TWA 0.1 ppm (0.4 mg/m3) C 0.2 ppm (0.8 mg/m3) 15-minute NIOSH IDLH: 2 ppm
Poison_Class
1
Exposure effects
   Ingestion
Nausea and vomiting may occur.
   Inhalation
Irritation of the upper airways, cough, burning sensation of the throat, dyspnea, pain in the chest and severe, delayed pulmonary edema can occur. Respiratory failure can result after significant exposures.
   Skin
Severe dermal burns or frostbite may develop following skin exposure to the liquefied material.
   Eyes
See Skin.

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
IRemove and isolate contaminated clothing and shoes.. n case of contact with liquefied gas, thaw frosted parts with lukewarm water Immediately flush skin with running water for at least 20 minutes. Effects may be delayed.
   Eyes
In case of contact with liquefied gas, thaw frosted parts with lukewarm water Immediately flush skin with running water for at least 20 minutes.

Transport.
UN number
1076
Response guide
Hazard class
2.3
PRTC
T
USCG CHRIS Code
PHG
 
Std. Transport #
4920184