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ABSTRACT
Thermal cracking was applied to a gas oil fraction having a boiling range of 350–390°C and a high pour point of 28°C. This cracking was carried out in an autoclave in the presence of ethoxylated phenol formaldehyde polymeric surfactant (EPF). The role of the used additive was to reduce the severity of the thermal cracking reactions resulting in a milder cracking process and thus reducing the feed loss. The effects of reaction temperature and residence time on the yields and pour point of the cracked gas oil were investigated. Enthalpies, entropies and activation energies were determined according to Arrhenius equation and the absolute rate theories. The results showed that the EPF additive had an inhibiting effect and accelerated the termination step. The suggested mechanism was confirmed from the kinetic view.