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Merriam Webster

TetradecaneTet`ra*dec"ane (?), n. [Tetra- + Gr. � ten.] (Chem.) A light oily hydrocarbon, C14H30, of the marsh-gas series; -- so called from the fourteen carbon atoms in the molecule.

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Higher alkanes

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Higher alkanes are alkanes having nine or more carbon atoms. Nonane is the lightest alkane to have a flash point above 25 °C, and so not to be classified as dangerously flammable.

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Uses

Alkanes from nonane to, for instance, hexadecane (an alkane with sixteen carbon atoms) are liquids of higher viscosity, less and less suitable for use in gasoline. They form instead the major part of diesel and aviation fuel. Diesel fuels are characterised by their cetane number, cetane being an old name for hexadecane. However the higher melting points of these alkanes can cause problems at low temperatures and in polar regions, where the fuel becomes too thick to flow correctly.

Alkanes from hexadecane upwards form the most important components of fuel oil and lubricating oil. In latter function they work at the same time as anti-corrosive agents, as their hydrophobic nature means that water cannot reach the metal surface. Many solid alkanes find use as paraffin wax, for example in candles. This should not be confused however with true wax, which consists primarily of esters.

Alkanes with a chain length of approximately 35 or more carbon atoms are found in bitumen, used for example in road surfacing. However, the higher alkanes have little value and are usually split into lower alkanes by cracking.

Properties

Nonane to hexadecane

  Nonane  Decane  Undecane  Dodecane  Tridecane  Tetradecane  Pentadecane  Hexadecane 
FormulaC9H20C10H22C11H24C12H26C13H28C14H30C15H32C16H34
CAS number[111-84-2][124-18-5][1120-21-4][112-40-3][629-50-5][629-59-4][629-62-9][544-76-3]
Molar mass (g/mol)128.26142.29156.31170.34184.37198.39212.42226.45
Melting point (°C)−53−30−26−9.6−55.59.918
Boiling point (°C)151174196216.2234253268–270287
Density (g/ml)0.7180.730.740.75 0.7630.7690.773
Viscosity (cP at 20 °C)0.7110.92 1.35 2.18 3.34
Flash point (°C)3146607110299132135
Autoignition
temperature
(°C)
205210 205 235 201
Explosive limits0.9–2.9%0.8–2.6%    0.45–6.5% 

Heptadecane to Tetracosane

  Heptadecane  Octadecane  Nonadecane  Eicosane  Heneicosane  Docosane  Tricosane  Tetracosane 
FormulaC17H36C18H38C19H40C20H42C21H44C22H46C23H48C24H50
CAS number[629-78-7][593-45-3][629-92-5][112-95-8][629-94-7][629-97-0][638-67-5][646-31-1]
Molar mass (g/mol)240.47254.50268.53282.55296.58310.61324.63338.66
Melting point (°C)2128–3032–3436.740.54248–5052
Boiling point (°C)302317330342.7356.5224 at 2 kPa380391.3
Density (g/ml)0.7770.777  0.792 0.797 
Flash point (°C)148165168     

Pentacosane to Triacontane

  Pentacosane  Hexacosane  Heptacosane  Octacosane  Nonacosane  Triacontane 
FormulaC25H52C26H54C27H56C28H58C29H60C30H62
CAS number[629-99-2][630-01-3][593-49-7][630-02-4][630-03-5][638-68-6]
Molar mass (g/mol)352.69366.71380.74394.77408.80422.82
Melting point (°C)5456.459.564.563.765.8
Boiling point (°C)401.9412.2442431.6440.8449.7
Density (g/ml)0.8010.7780.7800.8070.8080.810

Hentriacontane to hexatriacontane

  Hentriacontane  Dotriacontane  Tritriacontane  Tetratriacontane  Pentatriacontane  Hexatriacontane 
FormulaC31H64C32H66C33H68C34H70C35H72C36H74
CAS number[630-04-6][544-85-4][630-05-7][14167-59-0][630-07-9][630-06-8]
Molar mass (g/mol)436.85450.88464.90478.93492.96506.98
Melting point (°C)67.96970–7272.67574–76
Boiling point (°C)458467 285.4 at 0.4 kPa490265 at 130 Pa

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