Hydrocarbon conversion process with recycling of reduction effluents

A process for the catalytic reforming of a hydrocarbon feedstock comprising paraffinic, naphthenic and aromatic hydrocarbons containing from 5 to 12 carbon atoms per molecule, at a temperature of between 400° C. and 700° C., a pressure of between 0.1 and 10 MPa and a flow rate by weight of feedstock treated per unit weight of catalyst and per hour of between 0.1 and 10 h−1, in which process:

• said hydrocarbon feedstock (1) is circulated through at least:
• a) a first reaction zone, in the presence of hydrogen, comprising at least a series of two catalytic reforming reactors (R1, R2) comprising a first catalyst circulating in a moving bed;
• then
• b) a second reaction zone, in the presence of hydrogen, comprising at least a series of two catalytic reforming reactors (R3, R4) comprising a second catalyst circulating in a moving bed, identical to or different from the first catalyst, in order to obtain a reaction effluent (13);
• said first and second catalysts are circulated respectively through:
• i) said first reaction zone and said second reaction zone;
• then
• ii) a first regeneration zone and a second regeneration zone (REG);
• then
• iii) a first reduction zone and a second reduction zone (RED 1 and RED 2), in the presence of hydrogen, before returning said first and second catalysts, in stage i), to said first reaction zone and said second reaction zone;
• in which process the reduction effluents ( 4 and 7) obtained at the outlet of each reduction zone (RED 1 and RED 2) are sent at least in part to the top of the first reactor (R1, R3) of each reaction zone.