The invention relates to a catalytic
conversion method for increasing the yield of
gasoline and improving the
octane number of the
gasoline. The method of the invention mainly solves the problem of low
gasoline yield in a conventional catalytic
cracking process. The catalytic
conversion method provided by the invention comprises the following steps: allowing preheated
light hydrocarbons and heavyhydrocarbons to be simultaneously and respectively sprayed out from an integrated
spray nozzle into different reaction zones of a lift
pipe reactor to contact and react with a catalyst from a regenerator, allowing reaction products and a
carbon deposit catalyst to flow out from the lift
pipe reactor and to enter a
cyclone separation system for separation, allowing a separated catalyst to undergo steam stripping, then enter the regenerator for
charring and then return to the bottom of the lift
pipe reactor for cyclic use, and allowing the reaction products to undergo
fractional distillation viafractionating towers so as to obtain corresponding products, wherein the integrated
spray nozzle is a
spray nozzle capable of simultaneously and respectively spraying the
light hydrocarbons and the heavy hydrocarbons out from different spray heads; and the reaction zones are composed of a light
hydrocarbon reaction zone I, a heavy
hydrocarbon reaction zone and a light
hydrocarbon reaction zone IIsuccessively arranged along the vertical direction of the reactor from bottom to top. The catalytic
conversion method provided by the invention has the characteristics of capacity of increasing the yield of the gasoline and improving the
octane number of the gasoline.