Process for removing hydrogen sulfide and ammonia from gaseous streams
AssigneeEiC Corporation
InventorsWalter W. Harvey, Alkis C. Makrides
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Abstract
A process is described for the simultaneous removal of H.sub.2 S and ammonia from gaseous streams containing other acid and basic gases. The process comprises closed loop scrubbing of the gaseous stream with a copper sulfate-ammonium sulfate solution to yield a copper sulfide precipitate, concurrent neutralization of the acidity generated in the scrubbing step by addition or scrubbing of ammonia and other basic gases, separating the precipitate, hydrothermally leaching the precipitate with oxygen or air under controlled temperature and pressure to reoxidize the sulfide to copper sulfate, recycling the copper sulfate to the scrubber, and rejecting sulfur from the system in the form of (NH.sub.4).sub.2 SO.sub.4.
Claims11
A process for removing hydrogen sulfide from a gas stream also containing ammonia, comprising
- establishing a recirculating liquid stream comprising a liquid solution of a scrubbing agent consisting essentially of copper sulfate, said stream being buffered to an acidic pH with ammonium sulfate, said pH being sufficiently acidic to prevent the precipitation of copper as hydroxide or basic hydrated oxides at the operating conditions,
- contacting said liquid stream with said gas stream to react said copper sulfate with said hydrogen sulfide to precipitate copper sulfide, and
- removing copper sulfide precipitate from said recirculating liquid stream.
Dependencies are inferred from the claim text.