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.sub.2, and reducing the ammonia and cyanide content in the process water condensed in the product recovery section.

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.sub.2, and reducing the ammonia and cyanide content in the process water condensed in the product recovery section.