The Effect of Temperature on the Cool-Flame Oxidation of Rich Propane-Oxygen Mixtures

It has been experimentally shown that during the oxidation of propane in a stabilized cool flame in the temperature range 330–410°C in mixtures of the composition C3H8 : O2 from 1 : 1 to 6 : 1, the phenomenon of a negative temperature coefficient of the reaction rate (NTC) is observed. As the propane concentration in the initial mixture increases, the NTC region gradually changes and becomes less pronounced. In a mixture of the composition C3H8 : O2 = 6 : 1, the process is practically independent of temperature, that is, a zero temperature coefficient (ZTC) of the reaction rate can be stated. In this area of the NTC, with increasing temperature, the concentration of the formed olefins—ethylene and propylene—increases, while the concentration of oxygen-containing products such as methyl alcohol, formaldehyde, acetaldehyde and others, on the contrary, decreases.