OPTIMIZING PRODUCTION BY HYDROTREATING POOR FCC FEEDS AND FCC COMBINED PROCESS

Poor quality gas oil,a mixture of VGO,CGO and DAO,was hydrotreated to remove sulfur,nitrogen,metals and carbon residue.The hydrotreated gas oil was then blended as FCC feedstock.FCC unit operation data showed that the product slates were improved with the blending of hydrotreated gas oil: the yields of dry gas and coke decreased; the yields of LPG and naphtha plus LCO increased 2.71 percentages and 3.58 percentages,respectively.At the same time,the average sulfur contents of FCC naphtha and LCO reduced 61.1% and 42.8%,respectively.The economic profit of processing per ton FCC feed increased 70 RMB.