Continuous process for scrubbing h2s from a gas stream and selectively producing elemental sulfur
Abstract
Abstract 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 SUBSTANTIALLY FREE OF ANY NH4OH TO PRODUCE A TREATED GAS STREAM WHICH IS REDUCED H2A CONTENT AND IS SUBSTANTIALLY FREE OF NH3 AND A RICH ABSORBENT STREAM CONTAINING NH4HS; (2) CATALYTICALLY REACTING THE RICH ABSORBENT STREAM WITH A FIRST AIR STREAM TO PRODUCE AN EFFLUENT STREAM CONTAINING AMMONIUM POLYSULFIDE; (3) CATALYTICALLY REACTING THE RESULTING AMMONIUM POLYSULFIDE-CONTAINING LUQID STREAM WITH A SECOND AIR STREAM AT OXIDIZING CONDITIONS EFFECTIVE TO PRODUCE LIQUID SULFUR AND A SUBSTANTIALLY SULFIDE-FREE WATER STREAM CONTAINING NH3OH AND A MINOR AMOUNT OF (NH4)2SO3 (4) STRIPPING NH3 FROM AT LEAST A PORTION OF THIS LAST WATER STREAM IN ORDER TO PRODUCE A WATER STREAM WHICH IS SUBSTANTIALLY FREE OF AMMONIA AND SULFIDE; AND (5) SEPARATELY RECYCLING A PORTION OF THE WATER STREAM FORMED IN STEP (3) AS THE FIRST RECYCLE WATER STREAM AND A PORTION OF THE WATER STREAM FORMED IN STEP (4) AS THE SECOND RECYCLE WATER STREAM TO THE SCRUBBING STEP.
Inventors
- 👤 R Hamblin
Bibliographic Details
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