Abstract
Storage stabilities of jet fuels derived from petroleum were determined using laser light scattering, sediment formation and oxygen uptake measurements. Fuel degradation was monitored in the presence of the following added specific compounds: 2,5-dimethylpyrrole (DMP), N-methyl pyrrole (NMP), thiophenol, thiophene, decanethanol, dibutyl sulphide, dibutyl disulphide, tetrahydrothiophene, hexadiene, 1-hexene, indene, iron(II), and copper(II)-phthalocyanines (FePc, CuPc) and mixtures of some of these at various temperatures. The light scattering results are correlated with extent of deposit formation, which is an accepted measure of stability, and with oxygen uptake results. Light scattering intensity, weight of deposit and oxygen uptake increase with increase in storage time, concentration of added specific compound and stress temperature. Temperature variations of these measurements give activation energies of the degradation reactions. The first direct evidence has been obtained of the pyrrole radicals in DMP and NMP when a fuel is degraded in the presence of pyrrole. These two pyrrole radicals give different electron paramagnetic resonance parameters: g and linewidth values. The degradation products obtained in the presence of FePc and CuPc show properties which indicate that CuPc interacts with petroleum JP-5 with added DMP more strongly than does FePc.
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