Multi-zone moving-bed reaction device with an addition of regenerated or fresh catalyst in each zone

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 (3a), and a reaction zone (3b), located below upper reaction zone (3a), reaction zones are (3a) and (3b) being two successive reaction zones connected directly, on the one hand, by a path for reaction fluid and path for catalyst from zone (3a) to zone (3b).
• b) means (2a) for introducing regenerated catalyst and/or fresh catalyst from the top of the reactor into upper reaction zone (3a), and
• c) means (4a) within said reactor between reaction zones (3a) and (3b) for collecting spent catalyst obtained from upper reaction zone (3a), connected to:
• d) means (7) within said reactor below said means (4a) for collecting spent catalyst and intermediate zone (3a) and (3b) 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 (3a) to zone (3b) 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 (3b).