Ketene

  • Ethenone
  • Carbomethene
  • Ketoethylene
Formula
CH2=C=O
Structure
Description
Colorless gas. Penetrating odor.
Uses
Conversion of higher acids into their anhydrides.

Registry Numbers and Inventories.
CAS
463-51-4
EC (EINECS/ELINCS)
207-336-9
RTECS
OA7700000
RTECS class
Other
Merck
12,5309
Beilstein/Gmelin
1098282
Beilstein Reference
4-01-00-03418
Swiss Giftliste 1
G-3993
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C2H2O
Formula mass
42.04
Melting point, °C
-134.1
Boiling point, °C
-56
Vapor pressure, mmHg
12600 (25 C)
Vapor density (air=1)
1.45
Density
0.65 g/cm3 (-60 C)
Solubility in water
Very soluble
Refractive index
1.4355 (20 C)
Partition coefficient, pKow
0.11
Heat of vaporization
20.2 kJ/mol
Heat of combustion
-1025.4 kJ/mol

Hazards and Protection.
Storage
Cannot be atored in a gaseous state. Protect containers against physical damage by shock. Outdoor or detached storage is preferable. For indoor storage, use standard combustible liquid storeroom or cabinet.
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
Chemical splash goggles in compliance with OSHA regulations are advised; however, OSHA regulations also permit other type safety glasses. Whre chemical resistant gloves. To prevent repeated or prolonged skin contact, wear impervious clothing and boots.
Respirators
Use NIOSH/MSHA approved respirator appropriate for exposure of concern.
Small spills/leaks
Evacuate area and ventilate. Wear protective equipment. If required, use an inert absrobent. Sweep up and place in an appropriate container for disposal. Wash contaminated surfaces.
Stability
No data.
Incompatibilities
Strong oxidizing agents.
Decomposition
Substance may readily polymerize. Reacts violently with many organic compounds.

Fire.
Flash Point,°C
-107
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Use agent most appropriate to extinguish fire.
Health
3

Health.
Exposure limit(s)
OSHA PEL: TWA 0.5 ppm (0.9 mg/m3) NIOSH REL: TWA 0.5 ppm (0.9 mg/m3) ST 1.5 ppm (3 mg/m3) NIOSH IDLH: 5 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.

First aid
 
   Ingestion
Seek medical attention. If individual is drowsy or unconscious, do not give anything by mouth; place individual on the left side with the head down. Contact a physician, medical facility, or poison control center for advice about whether to induce vomiting. If possible, do not leave individual unattended.
   Inhalation
If symptoms develop, move individual away from exposure and into fresh air. If symptoms persist, seek medical attention. If breathing is difficult, administer oxygen. Keep person warm and quiet; seek immediate medical attention.
   Skin
Remove contaminated clothing. Wash exposed area with soap and water. If symptoms persist, seek medical attention. Launder clothing before reuse.
   Eyes
If symptoms develop, immediately move individual away from exposure and into fresh air. Flush eyes gently with water for at least 15 minutes while holding eyelids apart; seek immediate medical attention.

Transport.