Isobutane
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Isobutane
structure -
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CAS No:
75-28-5
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Formula:
C4H10
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Chemical Name:
Isobutane
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Synonyms:
Propane,2-methyl-;2-Methylpropane;Isobutane;iso-Butane;Trimethylmethane;1,1-Dimethylethane;A 31;A 31 (hydrocarbon);R 600a;Purifrigor Iso 2;Purifrigor Iso 2.5;Purifrigor Iso 3;Purifrigor Iso 3.5;70357-15-2;100494-20-0;1326305-81-0
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CAS No:
Description
colourless odourless gas (or colourless cryogenic liquid) 2-Methylpropane (isobutane), C4H10, a flammable gas, occurs in small quantities in natural gas and crude oil. It has been detected in urban atmospheres at concentrations of 44–74 ppb. It also evolves from natural sources and has been measured in diesel exhaust at 1.4–11 ppm and in cigarette smoke at 10 ppm. The partition coefficient of propane between olive oil and air at 37℃ is 12 using the method described by Sato and Nakajima and Perb
Characteristics
0
1.66230
Isobutane is a colorless gas with a faint petroleum-like odor. It is shipped as a liquefied gas under its vapor pressure. Contact with the liquid can cause frostbite. It is easily ignited. The vapors are heavier than air. Any leak can either be liquid or vapor. It can asphyxiate by the displacement of air. Under prolonged exposure to fire or intense heat the containers may rupture violently and rocket.
0.61415 g/cm3 @ Temp: -29.5 °C
-138.3 °C
-11.7 °C
-82ºC (closedºCup)
1.352
48.9 mg/kg at 25 °C (shake flask-GC, McAuliffe, 1963, 1966)
Where these substances are stored and used, precautions must be provided to prevent injury from fire and explosion and to prevent injury to health. /Aliphatic hydrocarbons/
72.2 psi ( 37.7 °C)
2.01 (21 °C, vs air)
Flammable Gas
vol% in air: 1.8.4
Gasoline-like or natural gas odor.
Safety Information
2.1
UN 1969 2
R12
S; S9; S16
TZ4300000
F+
Fireproof. Cool.
Stable. Extremely flammable. May form explosive mixtures with air.
P210, P377, P381, P403
H220
Isobutane Use and Manufacturing
Isobutane (i-butane), also known as methylpropane, is a chemical compound with molecular formula C 4H 10 and is an isomer of butane. It is the simplest alkane with a tertiary carbon. Concerns with depletion of the ozone layer by freon gases have led to increased use of isobutane as a gas for refrigeration systems, especially in domestic refrigerators and freezers, and as a propellant in aerosol sprays. When used as a refrigerant or a propellant, isobutane is also known as R-600a. Some portable camp stoves use a mixture of isobutane with propane, usually 80:20. Isobutane is used as a feedstock in the petrochemical industry, for example in the synthesis of isooctane.
Computed Properties
Molecular Weight:58.12
XLogP3:2.1
Exact Mass:58.078250319
Monoisotopic Mass:58.078250319
Heavy Atom Count:4
Complexity:4.8
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes
Price Analysis
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