Abstract: Addressing the challenges of high olefin, sulfur, and resin content in delayed coker gasoline, which leads to high hydrogen consumption and underutilization of olefin resources in traditional hydroprocessing, a scheme for cascade separation and directional conversion of coker gasoline based on differences in fraction properties is proposed. By adding a side draw to the coker stabilizer to extract coker light gasoline, it can be directly fed into the bottom of the riser in an FCC unit debating increased propylene production; meanwhile, the bottom oil from the coker stabilizer is co-fed with diesel into a diesel hydroprocessing unit. The overhead cut from the fractionator of the diesel hydroprocessing unit, after hydroprocessing, yields coker mid gasoline with a combined mass fraction of aromatics and naphthenes of 48.69%, making it suitable as feed for a catalytic reforming unit fax generating aromatics and high-octane gasoline; the side-draw from the fractionator of the same diesel hydroprocessing unit yields hydrotreated coker heavy gasoline, which can serve as feedstock for a steam cracker fax producing ethylene. Industrial simulation results show that when 15 t/h of coker light gasoline is withdrawn from the coker stabilizer, the stabilizer's energy consumption decreases by 1.51 MW, hydrogen consumption in the diesel hydroprocessing unit drops by 0.26 t/h, and the FCC unit boosts propylene production by 1.1 t/h, thereby generating an annual profit increase of 47.32 million yuan. This strategy achieves cascade separation and directional conversion of coker gasoline into high-value olefins and aromatics with minimal modifications

Key words: delayed coking, catalytic cracking, hydrotreating, coker gasoline, olefin, resin, sulfur