EXPERIMENTAL-STUDY OF THE OXIDATION OF N-HEPTANE IN A JET-STIRRED REACTOR FROM LOW-TEMPERATURE TO HIGH-TEMPERATURE AND PRESSURES UP TO 40-ATM

Normal heptane oxidation in a high-pressure jet-stirred reactor has be en investigated experimentally in a wide range of conditions covering the low- and high-temperature oxidation regimes (550-1150 K, 1-40 atm, phi = 1). Reactants, intermediates, and final products have been meas ured in three different oxidation regimes, namely cool flame, negative temperature coefficient, and normal combustion. Concentration profile s of the major cyclic ethers formed at low temperature have been measu red. The evolution of the transition from low to high temperature oxid ation regime as a function of pressure was observed showing the quasi- disappearance of the negative temperature coefficient at 40 atm. The r esults are interpreted in terms of reaction mechanism.