Carbonyl sulfide

  • Carbon oxysulfide
Formula
COS
Structure
Description
Colorless gas. Typical sulfide odor when pure.
Uses
Synthesis of thio organic compounds.

Registry Numbers and Inventories.
CAS
463-58-1
EC (EINECS/ELINCS)
207-340-0
RTECS
FG6400000
RTECS class
Tumorigen
UN (DOT)
2204
Beilstein/Gmelin
1697284
Beilstein Reference
4-03-00-00271
RCRA
D003
Swiss Giftliste 1
G-2335
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
COS
Formula mass
60.07
Melting point, °C
-138.2
Boiling point, °C
-50.2
Vapor pressure, mmHg
9412 (25 C)
Vapor density (air=1)
2.1
Critical temperature
105
Critical pressure
61.0
Density
2.721 g/cm3 (0 C)
Solubility in water
8 g/L
Surface tension
13 g/s2 (2 C)
Refractive index
1.24 (-87 C)
Dipole moment
0.65 D
Dielectric constant
1.0 (15 C)
Partition coefficient, pKow
0.08
Heat of fusion
4.7 kJ/mol
Heat of vaporization
18.52 kJ/mol
Heat of combustion
-549 kJ/mol

Hazards and Protection.
Storage
Store in accordance with all current regulations and standards.
Handling
Handle in accordance with all current regulations and standards.
Protection
Wear appropriate chemical protective clothing and gloves. Wear splash resistant safety goggles with a faceshield. Provide an emergency eye wash fountain and quick drench shower in the immediate work area.
Respirators
Wear positive pressure self-contained breathing apparatus.
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
No data.
Incompatibilities
Keep away from bases and oxidizing materials.
Decomposition
Oxides of carbon, hydrogen sulfide

Fire.
Flash Point,°C
-87
Upper exp. limit, %
29
Lower exp. limit, %
12
Fire fighting
Do not extinguish fire unless flow can be stopped. Do not apply water to point of leak in tank car or container. 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. Use alcohol foam, dry chemical or carbon dioxide.
Fire potential
Flammable; may be ignited by heat, sparks or flames. May form explosive mixtures with air.
Hazards
Flammable; may be ignited by heat, sparks or flames. May form explosive mixtures with air. May polymerize explosively when heated or involved in a fire. Vapors from liquefied gas are initially heavier than air and spread along ground. Vapors may travel to source of ignition and flash back. Some of these materials may react violently with water. Containers may explode when heated. Ruptured cylinders may rocket. Runoff may create fire or explosion hazard.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases.
Health
3
 
Flammability
4
 
 
Reactivity
1
 

Health.
Poison_Class
2
Exposure effects
   Ingestion
Nausea and vomiting may be noted. Weight loss can be seen with chronic exposure.
   Inhalation
Respiratory depression, cyanosis, pulmonary edema, bronchitis, and dyspnea may be noted following exposure to non-fatal concentrations.
   Skin
Skin exposure may result in severe pain, itching, and erythema, especially in moist areas. Cyanosis may be noted following severe exposure.
   Eyes
Contact may cause burns, severe injury and/or frostbite.

First aid
 
   Ingestion
Hydrogen sulfide is a gas at room temperature making ingestion unlikely.
   Inhalation
Immediately move patient to fresh air and administer 100 percent oxygen. Prevent self-exposure and possible death by wearing a self-contained breathing apparatus to rescue the victim.
   Skin
Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists.
   Eyes
Immediately flush with running water for at least 20 minutes.

Transport.
UN number
2204
Response guide
Hazard class
2.3
PRTC
T
USCG CHRIS Code
CFD
 
Std. Transport #
4920351