Isobutane CAS 75-28-5
R-600a; R600A; Isobutane
CAS number: 75-28-5
Molecular formula: C4H10
Molecular weight: 58.14
EINECS entry number: 200-857-2
Isobutane CAS 75-28-5 structural formula:
In terms of physical properties, isobutane is a colorless, slightly odorous gas with a melting point of -159.6°C, a relative density 0.56 less than water, a boiling point of -11.8°C, a relative vapor density 2.01 times that of air, a saturated vapor pressure of 160.09 kpa under standard conditions, and a heat of combustion of 2856.6 kJ/mol. The critical temperature of isobutane is 135°C, the critical pressure is 3.65 mpa, the flash point is -82.8°C, and the explosion range under certain conditions is 1.8% to 8.5% (volume fraction).
Chemically speaking, isobutane is a flammable gas that can form an explosive mixture when mixed with air. It is in danger of burning and exploding when exposed to heat sources or open flames. Since its vapor is heavier than air, it will spread downwards and may cause flashback if it encounters a fire source. In addition, isobutane reacts violently with oxidants and needs to be handled with care.
It is a colorless, flammable gas at room temperature and pressure. Melting point -159.4℃. Boiling point -11.73℃. Slightly soluble in water, soluble in ethanol, ether, etc. It forms an explosive mixture with air, with an explosion limit of 1.9% to 8.4% (volume). It mainly exists in natural gas, refinery gas, and cracking gas, and is obtained by physical separation and other methods. It can also be prepared by isomerization of n-butane. It is mainly used to produce isooctane through alkylation with isobutylene as a gasoline octane improver. It can also be used as a refrigerant.
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