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Propane CAS 74-98-6

Propane CAS: 74-98-6 Molecular formula: C3H8 Molecular weight: 44.1 Melting point: -188°C (lit.) Boiling point: -42.1°C (lit.) ...

Release time：2025-04-26

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Propane

CAS: 74-98-6

Molecular formula: C3H8

Molecular weight: 44.1

Melting point: -188°C (lit.)

Boiling point: -42.1°C (lit.)

Density: 0.564g/mLat20°C (lit.)

Vapor density: 1.5 (vsair)

Vapor pressure: 190Chemicalbookpsi (37.7°C)

Refractive index: 1.2861

Flash point: -104°C

Storage conditions ：-20°C

Acidity series: (pKa)≈44 (Gordon and Ford, 1972)

Form: liquid

Propane is a colorless and odorless combustible gas alkane containing 3 carbon atoms. It is heavier than air and often stays at low places. It can form an explosive mixture with air. The explosion limit is 2.4% to 9.5% (volume). It is easily soluble in ether, soluble in alcohol, benzene and chloroform, slightly soluble in acetone, and insoluble in water. However, it is easy to form solid hydrates with water at low temperatures, causing blockage of natural gas pipelines. The critical chemical temperature is 96.8℃ and the critical pressure is 4.24MPa. The chemical properties are not active, but reactions such as halogenation can occur. It exists in petroleum cracking gas and natural gas. Propane can be separated from oilfield gas and cracking gas in industry, and can be used as a raw material for the production of ethylene and propylene or a solvent in the oil refining industry; a mixture of propane, butane and a small amount of ethane can be liquefied into a civilian fuel, called liquefied petroleum gas. Chemical reaction

The chemical reaction formula for the complete combustion of propane in pure oxygen is: C3H8+5O2=3CO2+4H2O+2221.5kl/mol. According to the above formula, the theoretical oxygen consumption for the complete combustion of 1 volume of propane is 5 volumes. When the propane flame burns in the air, the actual oxygen consumption is 3.5 volumes, forming a neutral flame with a flame temperature of 2520℃ (about 580℃ lower than acetylene). The maximum temperature of the oxidation flame is about 2700℃ (about 600℃ lower than acetylene). The oxygen consumption is higher than that of acetylene.

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