Patent ID: 8293961

Claim:
A catalytic cracking process of producing light olefins, comprising: (a) supplying a paraffinic naphtha or kerosene feedstock and dilution steam or lift gas into a riser in which a flow regime is a fast fluidization regime, thus inducing a catalytic cracking reaction in the presence of a catalyst, the feedstock containing not more than 20 wt % olefins; (b) separating an effluent of the catalytic cracking reaction into the catalyst and a reaction product including ethylene and propylene; (c) stripping the catalyst separated in step (b) to remove a hydrocarbon compound contained therein; (d) mixing the catalyst stripped in step (c) with an oxygen-containing gas at 600° C. or more to remove coke contained therein, thus continuously regenerating the catalyst; (e) circulating the catalyst regenerated in step (d) into step (a), thus re-supplying regenerated catalyst into the riser; and (f) cooling, compressing and separating the hydrocarbon compound as the reaction product separated in step (b), thus preparing a light olefin product, wherein the catalyst is a solid acid catalyst for use in conversion into light olefins, the solid acid catalyst is the zeolite compound HZSM-5, and the catalyst has an average size of 40˜200 μm; wherein the light olefin product prepared in step (f) contains ethylene of higher than 14.6 wt % and propylene of higher than 16.9 wt %; and wherein the catalyst used in step (a) is the regenerated catalysts circulated from step (e).