Pilot-scale evaluation of hydrotreating inferior coker gas oil prior to its fluid catalytic cracking

摘要

Inferior coker gas oil (I-CGO) is difficult to directly process by fluid catalytic cracking (FCC) or hydrocracking owing to its high content of nitrogen and condensed aromatics. Catalysts in these units deactivate rapidly as a result of major coking and acid site neutralization. In this work, a two-step pilot-scale process consisting of hydrotreating I-CGO followed by FCC processing is designed to effectively convert I-CGO to high-value light fuel product. The results showed that the yield of gasoline increase by 12.88 wt%, whereas the yield of the slurry decrease by 20.55 wt%. Moreover, the quality of the products; including gasoline, light cycle oil (LCO), and slurry improved, significantly. These remarkable results arise from a synergy attributed to the ease of cracking of partially saturated condensed aromatics without major coking as well as reducing the content of basic nitrogen.