Paraffins and Alkanes - Combustion Properties
Properties like heat values, air/fuel ratios, flame speed, flame temperatures, ignition temperatures, flash points and flammability limits.
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| Paraffin or Alkanes | Chemical Formula | Higher Heating Value (Btu/lbm) | Air/Fuel Ratio | Maximum Flame Speed (ft/s) | Adiabatic Flame Temperature (oF) | Ignition Temperature (oF) | Flash Point (oF) | Flammability Limits | |
|---|---|---|---|---|---|---|---|---|---|
| LEL | UEL | ||||||||
| Ethane | C2H6 | 22323 | 15.899 | 1.3 | 3540 | 968 - 1166 | *) | 3.0 | 12.5 |
| n-Butane | C4H10 | 21321 | 14.984 | 1.2 | 3583 | 761 | -76 | 1.9 | 8.4 |
| iso-Butane | C4H10 | 21271 | 14.984 | 1.2 | 3583 | 864 | -117 | 1.8 | 8.4 |
| n-Heptane | C7H16 | 20854 | 14.141 | 1.3 | 3985 | 433 | 25 | 1.0 | 6.0 |
| n-Hexane | C6H14 | 20966 | 15.238 | 1.3 | 4030 | 478 | -7 | 1.3 | 7.0 |
| Methane | CH4 | 23875 | 17.195 | 1.1 | 3484 | 1301 | *) | 5.0 | 15.0 |
| Neopentane | C5H12 | 20978 | 15.323 | 1.1 | 4060 | 842 | *) | 1.4 | 7.2 |
| Neohexane | C6H14 | 20931 | 15.238 | 1.2 | 4055 | 797 | -54 | 1.2 | 7.6 |
| n-Octane | C8H18 | 20796 | 15.093 | 428 | 56 | 0.9 | 3.2 | ||
| iso-Octane | C8H18 | 20770 | 15.093 | 1.1 | 837 | 10 | 0.8 | 5.9 | |
| n-Pentane | C5H12 | 21095 | 15.323 | 1.3 | 4050 | 588 | < -40 | 1.4 | 7.8 |
| iso-Pentane | C5H12 | 21047 | 15.323 | 1.2 | 4055 | 788 | < - 60 | 1.3 | 9.2 |
| Propane | C3H8 | 21669 | 15.246 | 1.3 | 3573 | 871 | *) | 2.1 | 10.1 |
*) gas
- LEL - Lower Explosive or Flammable Limit
- UEL - Upper Explosive or Flammable Limit
- 1 ft/s = 0.3048 m/s
- T(oC) = 5/9[T(oF) - 32]
- 1 Btu/lbm = 2,326.1 J/kg = 0.55556 kcal/kg
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