Off-gas processing | Sour water stripping

Sour water derived from stripping column overhead accumulators and water washing operations contain impurities most notably sulfur compounds and ammonia which must be removed before the water can be reused in the refinery for desalting or is discharged to waste water treatment facilities.

The sour water stripping process uses a gas stream to force both hydrogen sulfide and ammonia out of the solution and into the gas phase. The off-gas from the sour water stripper is sent to a conventional sulfur recovery unit or to a wet gas sulfuric acid unit (WSA) for further treatment.

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Applications within this area

Amine regeneration

H₂S in refinery recycle and off-gasses is removed from the process by absorption in amine absorbers. Sour refinery off-gasses contain large amounts of H₂S.

Claus tail gas treatment

Topsoe offers a range of tail gas treatment catalysts that allow you to reach sulfur recoveries of 99.9% and comply with today’s tight regulations.

Fuel gas hydrotreating

Haldor Topsoe’s customized catalytic solution to clean up refinery fuel gas is the only offering of its kind and is commercially proven to improve refinery operations.

Sour water stripping

Topsoe’s technology helps you to remove the sulfur compounds and ammonia impurities from your derived sour water before you reuse it in the refinery or discharge it.