GASOLINE OCTANE ENHANCEMENT IN FLUID CATALYTIC CRACKING PROCESS WITH SPLIT FEED INJECTION TO RISER REACTOR

摘要

ABSTRACT OF THE DISCLOSUREA fluid catalytic cracking unit equipped withmultiple feed injection points along the length of theriser is operated such that portions of the same freshfeed are charged to different feed injection points.Preferably, the hydrocarbon fresh feed can be split intotwo or more non-distinct fractions, with one fractioncharged to the bottom injection point along the length ofthe riser reactor, and the remaining fractions charged toinjection points progressively higher up along the lengthof the riser reactor. Unconverted slurry oil boilingabove 650°F can be recycled to one or more of the variousinjection points along the length of the riser. Steam inexcess of levels typically employed for dispersion is usedat the bottom of the riser to help lift the regeneratedcatalyst. Other inert gases can be used in place of, orin conjunction with, steam to accomplish lifting of thecatalyst in the riser.