Waste Caustic Treatment - WAO (Wet Air Oxidation)


NPCC WAO Process

Nippon Petrochemical Co., Ltd. developed a process to treat waste caustic from ethylene plants by converting Na2S to Na2SO4 under Wet Air Oxidation. TOYO acquired the right to license the process to third parties and is prepared to supply a Basic Design Package on behalf of Nippon Oil Corporation, the present assignee of the process. Since 1975 TOYO has licensed the Wet Air Oxidation Process to 15 projects.


  • Use of Complete Mixing Type Reactor
  • Mild Reaction and No Expensive Materials of Construction
  • Simple Process Configuration and Easy Operation
If you have any questions, please click here.
Inquiry Form