A small-scale fixed fluidized bed(FFB)pilot plant was used to compare the potential of light circulating oil(LCO)catalytic cracking for producing light aromatics under the conditions suitable for LCO hydrogenation,the key components of FCC light aromatics in hydrogenation of LCO were identified as cycloalkanes and non-indenylated monocyclic aromatics.Based on the result that the mass fraction of cycloalkanes in hydrogenated LCO was positively proportional to its contribution to light aromatics yield and selectivity,a good linear relationship between the light aromatics selectivity contributed by non-indene monocyclic aromatic hydrocarbons and the mass fraction of that was obtained,and it was calculated that the non-indene monocyclic aromatic hydrocarbons in hydrotreated LCO contributed to the light aromatics selectivity about twice as much as that of cycloalkanes for the same mass fraction in an effective mass fraction interval of the key components(30％-70％).
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