Light cycle oil(LCO) and heavy cycle oil(HCO) from fluid catalytic cracking(FCC) were composed primarily of polycyclic aromatic hydrocarbons. LCO was fractionated into two fractions of diesel distillate and heavy distillate . The mixture fractions of both heavy distillate of LCO and HCO were defined as FCC cycle oil, which were normally used as feedstocks returning to FCC unit. However, its abundant aromatic content gave rise to lower conversion rate and major coke production.<br/>A synergistic process for FCC cycle oil efficient utilization was proposed in this study. FCC cycle oil was selectively hydrogenated via a hydrogenation apparatus, and then cracked in a FCC unit to produce high-Octane number gasoline. It is crucial that the aromatics from FCC cycle oil were selective saturated but not cracked in order to control hydrogen consumption and avoid the generation of worthless small molecule hydrocarbons in the hydrogenation apparatus.<br/>Compared with FCC cycle oil，the performance of hydrogenation FCC cycle oil was significantly improved. After hydrogenation, the amount of multiring aromatics decreased from 59.8 to 41.6 wt%, while monoaromatics (including alkylbenzenes, naphthenebenzenes and dinaphthenebenzenes) increased from 8.0 to 30.8 wt% and cycloalkanes increased from 16.3 to 23.6 wt%. The FCC experimental results showed that, compared with FCC cycle oil, the conversion rates of hydrogenation FCC cycle oil rose approximately 20% while the heavy oil yield reduced approximately 20%, and 26 wt% more gasoline could be obtained.

Synergistic process for efficiently converting FCC cycle oil

254th National Meeting (2017)

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