Method for treating refinery waste streams in a fluid catalytic cracking unit and an improved catalytic cracking unit for processing refinery waste streams

Abstract

A method of processing the waste stream includes introducing the waste stream into the Fluid Catalytic Cracking Unit 10 such that waste stream is processed within the regenerator unit 12 or in CO boiler unit 13 such that the waste stream and the regenerator flue gas are burned within the regenerator unit 12 or the CO boiler unit 13. The waste stream contains NH 3 and the NH 3 is converted to the NOx and N 2 . The fluid catalytic cracking unit may further include an assembly for converting NOx to N 2 . Flue gas from the CO boiler unit containing NOx and N 2 is fed to the assembly to NOx to N 2 within the assembly. The assembly for converting NOx to N 2 preferably includes a selective catalytic reduction unit 14 containing a catalyst, and wherein converting NOx to N 2 includes reacting the NOx with the catalyst to produce N 2 and H 2 O.

1 . A method of processing a waste stream in a fluid catalytic cracking unit, comprising:
 introducing the waste stream into the fluid catalytic cracking unit, wherein the waste stream contains NH 3 ; and   processing the waste stream within the fluid catalytic cracking unit, wherein processing the waste stream includes converting NH 3  to NOx and N 2 .   
     
     
         2 . The method according to  claim 1 , wherein the fluid catalytic cracking unit includes a reactor unit for reacting a process stream with a catalyst contained therein, and a regenerator unit for regenerating the catalyst, and wherein introducing the waste stream into the fluid catalytic cracking unit comprising introducing the waste stream into the regenerator unit. 
     
     
         3 . The method according to  claim 2 , processing the waste stream within the fluid catalytic cracking unit includes burning the waste stream within the regenerator unit. 
     
     
         4 . The method according to  claim 3 , wherein the fluid catalytic cracking unit further includes an assembly for converting NOx to N 2 , and wherein processing the waste stream further includes converting NOx to N 2  within the assembly. 
     
     
         5 . The method according to  claim 4 , wherein the assembly for converting NOx to N 2  includes a selective catalytic reduction unit containing a catalyst, and wherein converting NOx to N 2  includes reacting the NOx to N 2  within the assembly. 
     
     
         6 . The method according to  claim 2 , wherein the fluid catalytic cracking unit includes a regenerator air line for introducing air to the regenerator unit for regenerating the catalyst, and wherein introducing the waste stream into the regenerator unit includes mixing with the waste stream with the air for introduction into the regenerator unit. 
     
     
         7 . The method according to  claim 6 , processing the waste stream within the fluid catalytic cracking unit includes burning the waste stream within the regenerator unit. 
     
     
         8 . The method according to  claim 6 , wherein the fluid catalytic cracking unit further includes an assembly for converting NOx to N 2 , and wherein processing the waste stream further includes converting NOx to N 2  within the assembly. 
     
     
         9 . The method according to  claim 8 , wherein the assembly for converting NOx to N 2  includes a selective catalytic reduction unit containing a catalyst, and wherein converting NOx to N 2  includes reacting the NOx with NH3 over the catalyst to produce N 2  and H 2 O. 
     
     
         10 . The method according to  claim 1 , wherein the fluid catalytic cracking unit includes a regenerator unit for regenerating catalyst, wherein processing the waste stream comprising:
 feeding the waste stream to the regenerator unit; and   burning the waste stream in the regenerator unit to convert the NH 3  to NOx and N 2 .   
     
     
         11 . The method according to  claim 10 , wherein the fluid catalytic cracking unit further includes an assembly for converting NOx to N 2 , and wherein processing the waste stream further comprising:
 processing the waste stream in the assembly by converting NOx to N 2 .   
     
     
         12 . The method according to  claim 11 , wherein the assembly for converting NOx to N 2  includes a selective catalytic reduction unit containing a catalyst, and wherein converting NOx to N 2  includes reacting the NOx with NH3 over the catalyst to produce N 2  and H 2 O.