Method for producing aromatic hydrocarbons

Abstract

A method for producing aromatic hydrocarbons in which at least one feedstock oil selected from the group consisting of LCO produced from an FCC apparatus, hydrotreated LCO, naphtha and straight-run gas oil is brought into contact with a reforming catalyst inside a fluidized bed reactor, wherein the method includes transporting a reforming catalyst that has been extracted from the fluidized bed reactor to a heating tank, heating the reforming catalyst in the heating tank to a temperature at least as high as the reaction temperature inside the fluidized bed reactor, and following heating, transporting the heated reforming catalyst to the fluidized bed reactor.

1 . A method for producing aromatic hydrocarbons by bringing at least one feedstock oil selected from the group consisting of light cycle oil produced from a fluid catalytic cracking apparatus, hydrotreated light cycle oil, naphtha and straight-run gas oil into contact with a reforming catalyst inside a fluidized bed reactor, wherein the method comprises:
 transporting a reforming catalyst that has been extracted from the fluidized bed reactor to a heating tank,   heating the reforming catalyst in the heating tank to a temperature at least as high as a reaction temperature inside the fluidized bed reactor, and   following heating, transporting the heated reforming catalyst to the fluidized bed reactor.   
     
     
         2 . The method for producing aromatic hydrocarbons according to  claim 1 , wherein the heating of the reforming catalyst in the heating tank is performed by combusting, in presence of an oxygen-containing gas, a heating fuel supplied to the heating tank from an external source. 
     
     
         3 . The method for producing aromatic hydrocarbons according to  claim 2 , wherein the heating fuel is a distillation tower bottom oil from the product oil. 
     
     
         4 . The method for producing aromatic hydrocarbons according to  claim 3 , wherein an amount of the distillation tower bottom oil supplied to the heating tank is within a range from 0.005 to 0.08 tons per 1 ton of feedstock oil supplied to the fluidized bed reactor. 
     
     
         5 . The method for producing aromatic hydrocarbons according to  claim 1 , wherein an amount of the reforming catalyst extracted from the fluidized bed reactor is within a range from 5 to 30 tons per 1 ton of feedstock oil supplied to the fluidized bed reactor. 
     
     
         6 . The method for producing aromatic hydrocarbons according to  claim 1 , wherein a pressure inside the fluidized bed reactor is within a range from 0.1 to 1.5 MPaG. 
     
     
         7 . The method for producing aromatic hydrocarbons according to  claim 1 , wherein a reaction temperature inside the fluidized bed reactor is within a range from 350 to 700° C. 
     
     
         8 . The method for producing aromatic hydrocarbons according to  claim 1 , wherein a contact time between the feedstock oil and the reforming catalyst inside the fluidized bed reactor is within a range from 5 to 300 seconds.