Slow combustion and cool-flame behavior of iso-octane

The combustion of iso-octane has been studied in a static system between 290° and 347°C, and the slow combustion/cool flame boundaries have been plotted for several mixtures. Temperature ineasurements were again found to be the best method of discriminating between the different types of combustion. Detailed chemical analyses have been made in both the slow combustion and cool flame reactions. Qualitatively and quantitatively the products of both reactions are very similar, and include 2,2,4,4-tetramethyltetrahydrofuran, 2-tertbutyl-3-methyloxetan, 2-isopropyl-3,3-dimethyloxetan, isobutene, and isobutanal. The results are discussed in terms of alkylperoxy radical isomerization and decomposition theory which is capable of giving a qualitative account of the combustion products.