A system of diphenyldisulphide in hexadecane was selected for modeling the formation of insolubles in jet fuels. The system was stressed in a series of flask tests at 185°C under fixed oxygen flow. The quantity of filterable insoluble solids and insoluble gums was measured as a function of time and found to increase linearly following an initial induction period. Rates associated with the linear growth were evaluated for a series of oxygen flows to obtain the oxygen dependence of insoluble-solid and insoluble-gum formation. Results indicate that insoluble gums and insoluble solids are formed by independent processes. Bulk and surface rates show a linear correlation, indicating that the precursors to insolubles formed in the bulk and those formed on the surface are similar.

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