Abstract
Removal of particulates in slurry oil (SO) from the fluid catalytic cracking process is a challenging task in refining. In this study, we investigate the intrinsic characteristics of particulates in SO and the effect of thermal treatment on their flocculation and further separation. The particulates in SO were characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, etc. Results show that the particulates in SO are composed of coke powders and catalyst powders coated with coke species, with diameters of approximately 1 μm dominating the particle size distribution. The solid contents of middle fractions depend upon thermal treating severities. The particulates are originally dispersed in SO, whereas flocculation of particulates is observed after thermal treatment. A negative linear correlation is found between the solid contents of middle fractions and the asphaltene contents of thermally treated SOs under different thermal treating sever...
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