CATALYTIC CRACKING PROCESS USING FAST FLUIDIZATION FOR THE PRODUCTION OF LIGHT OLEFINS FROM HYDROCARBON FEEDSTOCK

摘要

Provided is a catalytic cracking process for preparing light olefin from a hydrocarbon, which enhances the production of light olefin by providing an adequate volume ratio and distribution of a catalyst by using a high-speed fluidized bed, and to improve the selectivity to ethylene and propylene. The catalytic cracking process for preparing light olefin from a hydrocarbon comprises the steps of: (a) supplying a naphtha or kerogen mixture, dilution steam or lift gas into a lift column characterized by having an internal fluidized bed region as a high-speed flowing region, and carrying out catalytic cracking in the presence of a catalyst; (b) separating the effluent of step (a) into the catalyst and a reaction product containing ethylene and propylene; (c) stripping the hydrogen compounds from the catalyst separated from step (b); (d) regenerating the catalyst of step (c) by mixing with gas containing oxygen, such as air; (e) recycling the catalyst regenerated from step (d) to step (a) and supplying back to the lift column; and (f) cooling, compressing and isolating the reaction product of step (b) to provide a light olefin product.