Abstract: High temperature wet air oxidation system for spent caustic, as an important environmental treatment unit of ethylene plant, plays an important role in cleaner production. This paper introduces the problems and deficiencies of high pressure wet air oxidation unit for spent caustic during its operation, and puts forward some technical improvement proposals with no major changes to the existing process, so as to guarantee the stable and long period operation of spent caustic oxidation system.

Key words: wet air oxidation of spent caustic, operational problem, corrective action