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ketene

ketene Suppliers list
Company Name: Shaanxi Dideu Medichem Co. Ltd
Tel: 029-88380327
Email: 1016@dideu.com
Products Intro: Product Name:ketene
CAS:463-51-4
Purity:99.0% Package:1KG;0.1USD
Company Name: Dideu Industries Group Limited
Tel: 029-88380327; 17691182729
Email: Service@dideu.com
Products Intro: Product Name:ketene ISO 9001:2015 REACH
CAS:463-51-4
Purity:99.00% Package:25kgs/Drum;200kgs/Drum Remarks:ISO 9001:2015 REACH Approved Manufacturer
Company Name: Chizhou Kailong Import and Export Trade Co., Ltd.  
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Email: xg01_gj@163.com
Products Intro: Product Name:Ethenone
CAS:463-51-4
Purity:99% Package:1kg/bag, 1kg/druM or 25kg/druM
Company Name: Portail Substances Chimiques  
Tel: 10 20 0000
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Products Intro: CAS:463-51-4
Company Name: HONEST JOY HOLDINGS LIMITED  
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Lastest Price from ketene manufacturers

  • ketene
  • US $0.10 / KG
  • 2020-01-01
  • CAS:463-51-4
  • Min. Order: 1KG
  • Purity: 99.0%
  • Supply Ability: 1000 tons
ketene Basic information
Product Name:ketene
Synonyms:Carbomethene;ethenone;Keten;Ethen-1-one;carbometene;ketene ISO 9001:2015 REACH
CAS:463-51-4
MF:C2H2O
MW:42.04
EINECS:207-336-9
Product Categories:
Mol File:463-51-4.mol
ketene Structure
ketene Chemical Properties
Melting point -150°
Boiling point bp -56°
density 0.6600
refractive index 1.3040 (estimate)
form Gas
Exposure limitsTLV-TWA 0.9 mg/m3 (0.5 ppm); STEL 3.0 mg/m3 (1.5 ppm) (ACGIH); IDLH 50 ppm (NIOSH).
EPA Substance Registry SystemKetene (463-51-4)
Safety Information
RIDADR 1955
HazardClass 2.3
Hazardous Substances Data463-51-4(Hazardous Substances Data)
MSDS Information
ketene Usage And Synthesis
Chemical PropertiesColorless 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.
UsesOrganic chemical syntheses; conversion of higher acids into their anhydrides; for acetylation in the manufacture of cellulose acetate and aspirin
UsesFor the conversion of higher acids into their anhydrides; for acetylation in the manufacture of cellulose acetate and aspirin.
UsesKetene is used as an acetylating agent inthe production of cellulose acetate, aspirin,acetic anhydride, and in various organicsyntheses.
Production MethodsKetene may be prepared also by pyrolysis of acetic anhydride or phenyl acetate or diketene. Other sources are quite unsatisfactory from a standpoint of yield. Small quantities may be made conveniently by heating acetone in a “ketene lamp.” This is a glass apparatus containing a Nichrome filament, heated electrically to red heat. Larger amounts are made by passing acetone or acetic acid through a tube at 700 °C. A very brief contact time is required, so that much of the acetone is undecomposed and has to be condensed and recycled. Also, it is imperative that the reaction tube be of inert material such as porcelain, glass, quartz, copper or stainless steel. A copper tube, if used, should be protected from oxidation by an iron sheath. Inert packing may be used (glass, vanadium pentoxide, porcelain), but just as good yields are obtained with empty tubes. No catalyst is known which accelerates this decomposition at significantly lower temperatures.
Health HazardKetene 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 HazardKetene 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 MethodsKetene 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.]
ketene Preparation Products And Raw materials
Raw materialsmethylketene-->Phenoxatellurin
Preparation Products2,2,6-Trimethyl-4H-1,3-dioxin-4-one-->Dichloroacetyl chloride
Tag:ketene(463-51-4) Related Product Information
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