Process for reducing corrosive contaminants in process water

Abstract

The disclosure relates to a process for the reduction of corrosive contaminants in process water, mainly through air or oxygen-containing gas or even pure oxygen injection into the riser, converting part of the ammonia carried from the regenerator to the riser into N 2 , and reducing the ammonia and cyanide content in the process water condensed in the product recovery section.

What is claimed is: 
     
         1 . A process for a reduction of corrosive contaminants in process water, the process comprising:
 injecting feedstock into a feedstock injection nozzle located 4 m above a base of a riser;   injecting air or oxygen-containing gas or even pure oxygen into the base of the riser through a lift steam injection nozzle below the feedstock injection nozzle; and   using a combustion promoter to a catalyst.   
     
     
         2 . The process of  claim 1 , wherein the combustion promoter to the catalyst is selected from platinum, palladium, rhodium, and iridium. 
     
     
         3 . The process of  claim 2 , wherein the combustion promoter has a maximum noble metal content in the catalyst inventory equivalent to 1 ppm on a mass basis in the catalyst. 
     
     
         4 . A process for a reduction of corrosive contaminants in process water, the process comprising:
 injecting feedstock into a feedstock injection nozzle located 4 m above a base of a riser;   injecting air or oxygen into a specific nozzle below the feedstock injection nozzle; and   using a combustion promoter to a catalyst.   
     
     
         5 . The process of  claim 4 , wherein the combustion promoter to the catalyst is selected from platinum, palladium, rhodium, and iridium. 
     
     
         6 . The process of  claim 5 , wherein the combustion promoter has a maximum noble metal content in the catalyst inventory equivalent to 1 ppm on a mass basis in the catalyst.