Caustic Treatment

Caustic treatment, specifically Gasoline/LPG Sweetening using caustic, stands as a popular method for removing traces of H2S and mercaptans from these process streams. Several variants of this process exist, with one of the most common involving caustic washing followed by catalytic oxidation of sulfides and thiosulfates, thereby returning regenerated caustic to the process. This chapter highlights key process parameters and areas prone to caustic-related corrosion.