Patent ID: 9234143
Filing Date: 2016-01-12
CPC Classification: C10G

Claim Text:
1. A catalytic cracking process, comprising: contacting a heavy feedstock and optionally an atomized steam with a catalyst containing a shape-selective zeolite having an average pore size of less than 0.7 nm in a first riser reactor to produce a first effluent comprising a first hydrocarbon product and a first coked catalyst; separating said first hydrocarbon product from said first coked catalyst in a separation device disposed downstream from the first riser; contacting a light feedstock and optionally an atomized steam with the catalyst containing a shape-selective zeolite having an average pore size of less than 0.7 nm in a second riser reactor to produce a second effluent comprising a second hydrocarbon product and a second coked catalyst; separating said first product in a product separation system to obtain a cracked gas, a cracked gasoline, a cracked light cycle oil, and a cracked heavy oil; feeding all or a part of the cracked heavy oil into the second riser, or into a fluidized bed reactor fluidly connected in series with said second riser reactor, or into both said second riser and said fluidized bed reactor; feeding the second effluent into the fluidized bed reactor to continue reacting therein and obtaining a third effluent comprising a third hydrocarbon product and a third coked catalyst from the fluidized bed reactor.