Air oxidation of sour condensates

This operation involves oxidation of sulfides initially present in the form of NH4SH along with low coexisting (NH4)2S and NH4OH content. 

Workable for S concentrations of 30 to 300 mg-l but involving instantaneous flows of about 20 to 200 m h h air oxidation does not serve the same purposes as when spent caustic is oxidized. 

It has relatively low concentrations of S to oxidize, usually in the absence of mercaptans, and tlie condensates contain very few oxides and S3. 

It is acceptable chat a certain amount of H2S may escape during the treatment, provided the polluted air is deodorized. Alternatively, if it does not meet standards, it must be used 

Catalytic oxidation by air ensures oxidation to the thiosulfate 8203 stage of sulfides. Process kinetics are accelerated by adding a catalyst (divalent metal Mn , Fe, Co or trivalent Fe ). 

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