Patent ID: 7531142
Filing Date: 2009-05-12
Classification: B01F,B01J

Abstract:
1. Multifunctional entry device for a downward flow tube reactor for supplying and distributing catalyst and mixing it with a hydrocarbon charge to be applied in the upper portion of said reactor, wherein said multifunctional device comprises: a predominantly cylindrical surrounding tube, coupled to said downward flow tube reactor, wherein the diameter of an upper portion of said surrounding tube is smaller than the diameter of said reactor, and the diameter of a lower portion of said surrounding tube expands slightly un to the diameter of the corresponding section of said reactor; a control valve installed in the upper portion of said surrounding tube and associated with a mechanism for re-directing a catalyst charge to the central region of the reactor; a cylindrical catalyst collector/distributor vessel, mounted axially and longitudinally below said control valve, having a bottom wall in the form of a plate having uniformly distributed perforations, the diameter of which is smaller than the diameter of said surrounding tube; means for injecting steam into the device, located between said control valve and said cylindrical catalyst collector/distributor vessel, installed on the walls of said surrounding tube; deflective means, in the form of an annular screen, installed on the walls of said surrounding tube, sufficiently spaced from the bottom of said cylindrical collector/distributor vessel for deflecting a stream of catalyst overflowing the catalyst collector/distributor vessel, in the form of an annular curtain, towards the central region of the surrounding tube, in a direction towards a mixing region formed below said annular screen; and means for injecting a hydrocarbon charge into the mixing region, said means installed on the walls of said surrounding tube and below said deflective means, said injecting means being disposed in at least two levels.