Novel catalytic reforming process with a recycle of the reduction effluent upstream of the first reactor and a recycle of the recycle gas to the last reactor or reactors in the series

Abstract

The present invention describes a process for regenerative reforming of gasolines, characterized by recycling at least a portion of the effluent from the catalyst reduction zone to the inlet to the feed/effluent exchanger that can pre-heat the feed, the other portion possibly being recycled to the head of the first reactor, and by recycling gas from the recycle compressor to the head of the penultimate reactor of the series. This disposition can significantly improve the production of reformate and the hydrogen balances of the unit.

1 . A process for catalytic reforming of a gasoline with a distillation range in the range 60° C. to 250° C. in a moving bed catalytic reforming unit comprising a reaction zone having four reactors in series (R 1 , R 2 , R 3  and R 4 ), and a zone for regeneration of said catalyst comprising a step for reduction of catalyst by hydrogen, in which the gaseous effluent ( 4 ) from said catalyst reduction step is recycled in part to the inlet of the feed/effluent exchanger (E 1 ) preceding the first reactor R 1  of the series, and in part directly to the head of reactor R 1 , and in which the effluent ( 7 ) derived from the recycle compressor (RCY) located between the separator drum (BS) and the series of reactors (R 1 , R 2 , R 3  and R 4 ) is recycled in its in entirety or in part to the head of the penultimate reactor (R 3 ). 
     
     
         2 . A process for catalytic reforming of a gasoline according to  claim 1 , in which the gaseous reduction effluent ( 4 ) is sent in its entirety to the head of the first reactor R 1 , and the effluent ( 7 ) derived from the recycle compressor (RCY) is recycled in its entirety to the penultimate reactor (R 3 ). 
     
     
         3 . A process for catalytic reforming of a gasoline according to  claim 1 , in which the gaseous reduction effluent ( 4 ) is sent in its entirety to the inlet to the feed/effluent exchanger (E 1 ), and the effluent ( 7 ) from the recycle compressor (RCY) is recycled in its entirety to the penultimate reactor (R 3 ).