Paraffins and Alkanes - Combustion Properties

Properties like heat values, air/fuel ratios, flame speed, flame temperatures, ignition temperatures, flash points and flammability limits for paraffins and alkanes.

Paraffin or Alkanes	Chemical Formula	Higher Heating Value (Btu/lbm)	Air/Fuel Ratio	Maximum Flame Speed (ft/s)	Adiabatic Flame Temperature (°F)	Ignition Temperature (°F)	Flash Point (°F)	LEL (%)	UEL (%)
Ethane	C2H6	22323	15.899	1.3	3540	968 - 1166	*	3	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	6
n-Hexane	C6H14	20966	15.238	1.3	4030	478	-7	1.3	7
Methane	CH4	23875	17.195	1.1	3484	1301	*	5	15
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

Conversion Factors

Flame Speed: 1 ft/s = 0.3048 m/s
Temperature: T (°C) = 5/9 (T (°F) - 32)
Heat Value: 1 Btu/lbm = 2,326.1 J/kg = 0.55556 kcal/kg

Definitions

LEL - Lower Explosive or Flammable Limit
UEL - Upper Explosive or Flammable Limit
(*) gas - indicates gaseous state at standard conditions

Paraffins and Alkanes - Combustion Properties | MEPKit Engineering Tools | MEPKit