| 摘要 |
H2S is removed from a gas stream and sulfur is produced by the steps of: (1) sequentially scrubbing the gas stream with a first recycle water stream containing NH4OH and then with a second recycle water stream which is sbustantially free of NH4OH to produce a treated gas stream which is reduced in H2 S content and is substantially free of NH3 and a bottom water stream containing NH4HS; (2) catalytically treating the bottom water stream with an air stream to produce an effluent stream containing ammonium polysulfide; (3) treating the ammonium polysulfide-containing stream to recover sulfur and to produce a water stream which is substantially free of NH4 OH and a water stream containing NH4OH; and, (4) separately recycling at least a portion of these last two streams to the scrubbing step.
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