Abstract

Approximately 100 phenolic compounds have been identified in a caustic extract from catalytically cracked light cycle oil of Bass Strait origin. No other classes of compounds were found in the extract, which contained < 0.5 wt% of sulphur and nitrogen. Addition of the extract to other, more stable distillates caused them to yield increased amounts of total insoluble material during thermal ageing. Infrared spectroscopic evidence indicated that oxidative coupling of the phenols was the most probable mechanism responsible for the increased instability of the fuels. The role of phenolic oxidative coupling, in conjunction with other fuel degradation mechanisms, is discussed.

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