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Detail of 74-86-2
- Product Name:Ethyne
- CAS No:74-86-2
- Boiling Point:-28 ºC
- Melting Point:-88 ºC
- Hazard Symbols:
- Molecular Formula:C2H2
- Molecular Structure:
- Synonyms:Acetylene(8CI); Vinylene (7CI); Ethine; Narcylen
- Transport Information:UN 1001
- EINECS:200-816-9
- Molecular Weight:26.04
- Flash Point:-18 ºC
- Density:0.568 g/cm3
- Solubility:0.106 g/100 mL
- MSDS:ACETYLENE(74-86-2).pdf
- Safety:Mildly toxic by inhalation. Human systemic effects by inhalation: headache and dyspnea. Narcotic in high concentration. In general industrial practice, acetylene does not constitute a serious toxic hazard. It is a very dangerous fire hazard when exposed to heat, flame, or oxidizers. Moderate explosion hazard when exposed to heat or flame or by spontaneous chemical reaction. At high pressures and moderate temperatures, and in the absence of air, acetylene has been known to decompose explosively. Reacts with copper to form the explosive copper acetylide. Incompatible with brass, copper salts, copper carbide, powdered Co, Hg, Hg salts, K, Ag and Ag salts, RbH, CsH, halogens, HNO3, NaH, oxidants. Acetylene + halide + UV can explode. Molten K ignites in C2H2 and then explodes. C2H2 reacts vigorously with trifluoromethyl hypofluorite. With O2, C2H2 can detonate very powerfully. See ACETYLIDES. When ignited, it burns with an intensely hot flame; can react vigorously with oxidizing materials.When mixed with O2 in proportions of 40% or more, acetylene acts as a narcotic and has been used in anesthesia. Acetylene acts as a simple asphyxiant by diluting the O2 in the air to a level that will not support life. However, the presence of impurities in commercial acetylene may result in the production of symptoms before an asphyxiant concentration is reached. Thus: 10% in air produces a slight intoxication, 20% produces a staggering gait, 30% produces general incoordination, 33% leads to unconsciousness in 7 minutes, up to 80% produces complete anesthesia, increased blood pressure, narcosis, and stimulated respiration.Dizziness, headache, mild gastric symptoms, and (in high concentration) semi-asphyxia and brief loss of consciousness have all been reported. See ARGON for a discussion of simple asphyxiants. To fight fire, use CO2, water spray, or dry chemical. Stop flow of gas.
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- Ethyne, dichloro- (9CI)(7572-29-4)
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- 1-(Trimethylsilyl)-2-(4-chlorophenyl)ethyne(78704-49-1)
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- Bis(tributylstannyl)ethyne(994-71-8)
- carbanide; ethyne; uranium(+2) cation(72661-33-7)
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- Phenyl(trimethylstannyl)ethyne(1199-95-7)
- 1-Phenyl-2-(4-trimethylsilylphenyl)ethyne(136459-72-8)
Grade
- Technical, containing 98% acetylene and not more than 0.05% by volume of phosphine or hydrogen sulfide; 99.5%.
ChemUse
- Manufacture of vinyl chloride; vinylidene chloride; vinyl acetate; acrylates; acrylonitrile; acetaldehyde; per- and trichloroethylene; cyclooctatetraene; 1,4-butanediol; carbon black; and welding and cutting metals.
Derivation
- (a) By the action of water on calcium carbide; (b) by cracking petroleum hydrocarbons with steam (Wulff process), or natural gas by partial oxidation (BASF process); (c) from fuel oil by modified arc process.
Properties
- Colorless gas; garlic-like odor. Flammable. Bp: −84.0° (subl), lel: 2.5%, uel: 82%, mp: −81.8°, flash p: 0°F (CC), d: 1.173 g/L @ 0°, autoign temp: 581°F, vap press: 40 atm @ 16.8°, vap d: 0.91, d: (liquid) 0.613 @ −80°, d: (solid) 0.730 @ −85°. Sltly sol in water; mod sol in ethanol and acetic acid; very sol in Me2CO; almost misc in ether.
TOXICITY
1. ihl-hmn TCLo:20 pph:CNS,RSP
34ZIAG Toxicology of Drugs and Chemicals ,Deichmann, W.B.,New York, NY.: Academic Press, Inc.,1969,67. 2. ihl-hmn LCLo:50 pph/5M
TABIA2 Tabulae Biologicae. 3 (1933),231. 3. ihl-uns LCLo:50 pph/5M
AEPPAE Naunyn-Schmiedebergs Archiv fuer Experimentelle Pathologie und Pharmakologie. 138 (1928),65.