Abstract: The development and industrial application of a treatment technology for the spent caustic containing sulfur from propane dehydrogenation unit were introduced. The technology consisted of alkalization neutralization-wet air oxidation-acid neutralization. The industrial unit using the technology operated stably. The S2- mass concentration of the effluent of this unit was less than 1 mg/L, and the COD was less than 200 mg/L. Up to now, a number of units have been built adopting the developed treatment technology.

Key words: propane dehydrogenation unit, spent caustic, wet air oxidation