A small Brazilian refiner uses an oxidation process to treat caustic from gasoline-sweetening efforts
Processing low-sulfur fuels will require refiners to use more
polishing and sweetening processes to strip out sulfidic and acidic
compounds. Caustic pre-washings and gasoline sweetening processes
effectively remove mercaptans and disulfides from hydrocarbon
streams. However, the spent caustic is considered a hazardous
stream and must be handled as such. It cannot be directly managed
by biological wastewater treatment processes. Thus, refiners must
dispose of this product offsite or use other treatment
methodologies. Consequently, as refiners use more polishing and
caustic-washing applications to produce cleaner fuels,
disposal/treatment of spent caustic is more crucial.
Case
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