| 摘要 |
<p>An apparatus and method for processing different feeds in a fluid catalytic crackingunit are disclosed which result in improved yields of C3, C4and gasoline range hydrocarbons as compared to conventional systems. The processcomprises injecting a main hydrocarbon feed into a catalyst-containing riserreactor through a plurality of main feed injectors, and injecting a light hydrocarbonfeed into the riser reactor at a location upstream from the main feed injectorsand downstream from a control valve such as a regenerated catalyst slide valve,the light feed being injected in a region having a high density of catalyst particles.The light feed is injected in a dispersed way such the amount of feed injected correspondsto the density of catalyst particles at that particular point, with greater amountsof feed being injected at locations having a large number of catalyst particles.Also, a heavy hydrocarbon feed or a heavy recycle stream from the same FCC unitcan be injected at the same elevation as the main feed injectors but through separateinjectors.</p> |
