Naphtha catalytic cracking method with compartments in the turbulent fluidised bed reactor

1) A compartmentalized fluidized bed reactor for the catalytic cracking of light cuts for the purpose of producing major intermediates of petrochemistry and in particular light olefins, said reactor having a diameter of between 6 and 25 meters, preferably of between 10 and 20 meters, and an H/D ratio of between 0.1 and 1, and preferably of between 0.2 and 0.6, and exhibiting compartments obtained by vertical radial partitions extending substantially over the entire height H of the reactor, and being provided with a central cylindrical chamber which communicates by overflowing with a or the said compartments, the ratio of the diameter of the central chamber to the diameter of the reactor being between 0.1 and 0.5 and preferably between 0.15 and 0.3, the upper part of the reactor located above the compartments making possible the separation of the fluidization gas and of the catalytic solid particles, and the compartments of said reactor being fluidized at a fluidization velocity of between 0.5 and 1.5 m/s, preferably between 0.7 and 1.3 m/s and more preferably between 0.8 and 1 m/s.