The present invention relates to a device and a method for catalytic cracking in a fluidized bed of a hydrocarbon feedstock, in which: a first hydrocarbon feedstock (2A) and at least a second hydrocarbon feedstock (2B, 2C) are cracked in a first compartment ( 6A) and at least one second compartment (6B, 6C) of a dense fluidized bed reactor (1), respectively, the first hydrocarbon charge (2A) being lighter than the second hydrocarbon charge (2B), and in which the first compartment (6A) is supplied with a fresh and / or regenerated catalyst (4) and the second compartment (6B) is supplied with catalyst (4) by circulation between the first compartment (6A) and the second compartment (6B). Figure 1A to be published
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