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Treating foul refinery waste waters with absorber gas

Image Number 2 for United States Patent #3984316.

Refinery waste waters containing dissolved hydrogen sulfide and ammonia are stripped of hydrogen sulfide by a countercurrent stream of refinery absorber gas which removes substantially all of the hydrogen sulfide and none of the ammonia. The dissolved ammonia is subsequently removed by steam stripping, leaving a waste water sufficiently clean to be non-polluting.

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