Gasoline ignition temperature

Liquefied petroleum gas (LPG) was involved in 17% of the incidents (see Chapter 8), followed by heavy oils (see Section 12.4), gasoline, hydrogen, and hydrocarbon gases. Heavy oils are involved in so many incidents because they are often handled above their auto-ignition temperature and because they are involved in foamovers. 

In the case of gasoline plus an antiknock agent the consumption of oxygen is less at the same temperature than with gasoline alone, showing that these compounds have the capacity to retard oxidation. And since the ignition temperature is dependent on the relation between the speed at which heat is developed and that at which it is lost these compounds should increase the ignition temperature of a fuel. 

Table XXXI.—Effect of Compounds on the Self-Ignition Temperature of Gasoline Wccrman). ...

Table XXXII.—-Rise of Ignition Temperature of Gasoline by Antiknock Dopes.

The ignition points of charcoal and other carbons vary widely and are influenced by the presence of catalysts such as lead salts. Nebel and Cramer, in a study concerning the behavior of carbon in gasoline engines, reported an ignition temperature of 555°C for pure carbon, but the addition of lead compounds depressed the ignition... 

The process fluid. Cyclohexane (CgHi2, MW 84) is a colorless liquid similar in some of its properties to gasoline (flash point 20°C, auto-ignition temperature (AIT) 245°C). The fluid has a normal boiling point of 80°C and a saturation pressure, p i, at 150°C of 0.55 MPa. When the liquid was saturated with nitrogen, or air as when oxidation was occurring in the reactor stream, the pressure was 0.96 MPa. Under these conditions the liquid was 99.8% CsHi2 and 0.2% Nj or air the vapor would have consisted of 82.6% C Hij and 17.4% Nj... 

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