Patent ID: 7611678

Claim:
A reaction device comprising a catalytic reactor of elongated shape along an essentially vertical axis, said reactor comprising several vertically-staged catalytic reaction zones of similar diameters, said reactor being suitable for the circulation of at least one moving-bed granular catalyst that descends successively into each of the reaction zones and comprises means ( 100 ) for introducing and means ( 101 ) for evacuating a reaction fluid, means ( 102 ) for introducing fresh or regenerated catalyst at the top of the reactor, and means ( 105 ) for evacuating spent catalyst from a lower part of the reactor, said reactor comprising: a) an upper reaction zone ( 3 a ), and a reaction zone ( 3 b ), located below upper reaction zone ( 3 a ), reaction zones are ( 3 a ) and ( 3 b ) being two successive reaction zones connected directly, on the one hand, by a path for reaction fluid and path for catalyst from zone ( 3 a ) to zone ( 3 b ). b) means ( 2 a ) for introducing regenerated catalyst and/or fresh catalyst from the top of the reactor into upper reaction zone ( 3 a ), and c) means ( 4 a ) within said reactor between reaction zones ( 3 a ) and ( 3 b ) for collecting spent catalyst obtained from upper reaction zone ( 3 a ), connected to: d) means ( 7 ) within said reactor below said means ( 4 a ) for collecting spent catalyst and intermediate zone ( 3 a ) and ( 3 b ) for mixing at least a portion of spent catalyst thus collected with an addition of fresh or regenerated catalyst, connected to: e) conduit ( 103 ) located outside said path for catalyst from zone ( 3 a ) to zone ( 3 b ) and entering said mixing zone for providing said addition of fresh or regenerated catalyst, and f) means for passing the catalyst mixture thus produced in said means for mixing to the reaction zone ( 3 b ).