Process and device for the production of aromatic compounds including a reduction of the catalyst

Abstract

The invention relates to a process for the production of aromatic compounds from a hydrocarbon fraction with a catalyst that preferably circulates in a moving bed, a process that comprises at least the following successive stages that take place in at least one zone: treatment of the fraction in the presence of hydrogen and implementing at least one reaction for dehydrogenation of naphthenes; separation of the gas effluent that contains hydrogen, the liquid product and the catalyst; regeneration of the catalyst; reduction of the catalyst; and reintroduction of the catalyst for the treatment stage; recycling in the treatment stage of at least a portion of the gas effluent that contains the hydrogen that is called recycling gas; process in which the reduction stage is carried out in the presence of recycling gas that is introduced in an amount such that the amount of pure hydrogen that is provided is between 1-10 kg/kg of catalyst, whereby the effluent that is obtained from the reduction is then separated from the catalytic bed. The invention also pertains to the related device.

1 - 11 . (canceled)  
     
     
         12 . An apparatus for the preparation of an aromatic compounds from a hydrocarbon fraction with a catalyst that circulates in a moving bed, comprising: 
 at least one zone for treating the fraction that implements a reaction for dehydrogenation of naphthenes, wherein said zone is equipped with at least one pipe for introducing the fraction, at least one pipe for drawing off a treated fraction, at least one pipe for introducing the catalyst at the top of said zone, and at least one pipe to output the catalyst that is located at the bottom of said zone, at least one pipe for introducing a gas that contains hydrogen, and at least one pipe to extract a gas flow;    at least one zone for separating the catalyst, the liquid product and the gas effluent that contains hydrogen;    at least one zone for regenerating the catalyst;    at least one zone for reducing regenerated catalyst connected to the zone that implements the dehydrogenation of naphthenes in a manner that the reduced catalyst enters the dehydrogenation zone via the pipe for the introduction of the catalyst, wherein said reduction zone is equipped with at least one pipe for introducing a gas that contains hydrogen, and at least one pipe for extracting a gas flow;    at least one pipe for recycling at least a portion of the gas effluent that contains hydrogen from said separation zone to said zone that implements the dehydrogenation reaction; and    at least one pipe for recycling at least a portion of the gas effluent that contains hydrogen in the pipe for the introduction of gas into the reduction zone.    
     
     
         13 . An apparatus according to  claim 12 , further comprising at least one reaction zone that is located after the zone that implements the dehydrogenation reaction, wherein the at least one reaction zone comprises at least one pipe to input the catalyst and one pipe to output the catalyst, at least one pipe to introduce a gas that contains hydrogen, at least one pipe to output a gas effluent, at least one pipe to input the reaction effluent that is obtained from the preceding zone, and a pipe for the reaction effluent that is obtained from this zone, wherein the pipe to introduce a gas that contains hydrogen is connected to pipes for the extraction of gas flows that are obtained from the dehydrogenation zone and the reduction zone.  
     
     
         14 . An apparatus according to  claim 13 , wherein the pipe for the introduction of a gas that contains hydrogen is connected to a pipe that provides the recycled gas effluent.