Patent ID: 8778170

Claim:
A process for producing light olefins and aromatics, comprising the steps of: obtaining a reaction system comprising a first reaction zone, a final reaction zone, and optionally one or more reaction zones disposed between the first reaction zone and the final reaction zone; introducing a feedstock and a catalytic cracking catalyst into the first reaction zone; introducing substantially all effluent from the first reaction zone into a reaction zone downstream from the first reaction zone; obtaining a spent catalyst and a reaction product stream from the final reaction zone; separating the spent catalyst from the reaction product stream; regenerating the spent catalyst to produce a regenerated catalyst; introducing the regenerated catalyst into the reaction system, wherein reaction temperatures in the reaction system range from 400° C. to 800° C. and a reaction temperature in a reaction zone downstream from the first reaction zone is higher than that of the first reaction zone, wherein values of WHSV in the reaction system range from 0.1 h −1 and 750 h −1 and the WHSV of a reaction zone downstream from the first reaction zone is lower than that of the first reaction zone.