ketene

Product Name:
ketene
CAS No.
463-51-4
Chemical Name:
ketene
CBNumber:
CB9934768
Molecular Formula:
C2H2O
Formula Weight:
42.03668
MOL File:
463-51-4.mol
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ketene Property

Melting point:
-150°
Boiling point:
bp -56°
Density 
0.6600
refractive index 
1.3040 (estimate)
Exposure limits
TLV-TWA 0.9 mg/m3 (0.5 ppm); STEL 3.0 mg/m3 (1.5 ppm) (ACGIH); IDLH 50 ppm (NIOSH).
EPA Substance Registry System
Ketene (463-51-4)
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Safety

RIDADR 
1955
HazardClass 
2.3
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ketene Chemical Properties,Usage,Production

Chemical Properties

Colorless gas with a sharp penetrating odor;liquefies at -56°C (-68.8°F); solidifies at-151°C (-239.8°F); soluble in alcohol andacetone, decomposed by water.

Uses

For the conversion of higher acids into their anhydrides; for acetylation in the manufacture of cellulose acetate and aspirin.

Uses

Ketene is used as an acetylating agent inthe production of cellulose acetate, aspirin,acetic anhydride, and in various organicsyntheses.

Health Hazard

Ketene is a highly toxic gas. It causes severeirritation to the eyes, nose, throat, and skin.Exposure to 10–15 ppm for several minutescan injure the respiratory tract. It causespulmonary edema. A 30-minute exposure to23 ppm was lethal to mice and a 10-minuteexposure to 200 and 750 ppm caused deathto monkeys and cats.

Fire Hazard

Ketene in its gaseous state should be flammable and explosive in air. The pure compound, however, polymerizes readily and cannot be stored as a gas. Its flash point and LEL and UEL values are not reported. It can react violently with oxidizers and many organic compounds. Its small size and the olefinic unsaturation impart further reactivity to the molecule.

Purification Methods

Ketene is prepared by pyrolysis of acetic anhydride. Purify it by passing through a trap at -75o and collecting in a liquid-nitrogen-cooled trap. Ethylene is removed by evacuating the ethylene in an isopentane-liquid-nitrogen slush pack at -160o. Store it at room temperature in a suitable container in the dark or better at -80o, but do not store it under pressure as it may EXPLODE. It is a strong IRRITANT when inhaled and is as poisonous as phosgene. See diketene in “Heterocyclic Compounds”, Chapter 4. [Hurd Org Synth Coll Vol I 330 1941, Andreades & Carlson Org Synth Coll Vol V 679 1973.]

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ketene Suppliers

Global(5)Suppliers
Chizhou Kailong Import and Export Trade Co., Ltd.
Tel:
Please Email
Fax:
-
Email:
xg01_gj@163.com
Country:
China
ProdList:
9559
Advantage:
50

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