Patent ID: 8551324
Filing Date: 2013-10-08
Classification: C10G

Abstract:
1. A process for the production of gasoline employing a fluid catalytic cracking unit (FCC) having at least one principal reactor ( 1 ) operating in riser or downer mode, the coked catalyst from the reactor ( 1 ) outlet being introduced into a stripping zone, termed a stripper, operating in fluidized bed mode and having a dense phase ( 3 ) surmounted by a diluted phase ( 2 ), said unit processing a heavy cut with a Conradson Carbon of less than 0.1 and a hydrogen content of more than 12.7% by weight, in which process a recycle of one of the following cuts: LCO, HCO or slurry, or any mixture of said cuts, termed the coking cut, is carried out in a fluidized side chamber ( 7 ) branching off the stripper, i.e. along a transfer line ( 6 ), ( 11 ), the upper portion of the transfer line ( 6 ) having its origin at an upper point of the dense phase ( 3 ) of the stripper and the lower portion of the transfer line ( 11 ) having its return to the dense phase ( 3 ) of said stripper at a point located below the upper point, said side chamber ( 7 ) being placed upstream of a valve ( 12 ) for regulating the flow rate of the catalyst, placed on the lower portion of the transfer line ( 11 ) and being provided with a vent line ( 13 ) allowing the gases produced to be returned to the diluted phase ( 2 ) of the stripper, said side chamber ( 7 ) further comprising in its lower portion a lower packing ( 9 ) located below the point for introducing the recycle stream ( 14 ), and in its upper portion an upper packing ( 8 ) located above the point for introducing catalyst via the transfer line ( 6 ), in which process the flow rate for withdrawing catalyst introduced into the side chamber ( 7 ) is in the range 50 to 100 kg/m 2 /s and the overall residence time for said catalyst in the side chamber ( 7 ) is in the range 20 to 100 seconds.