Treatment of an aqueous waste stream from a hydrocarbon conversion process
Abstract
Abstract AN AQUEOUS WASTE STREAM CONTAINING NH4HS, WHICH IS TYPICALLY PRODUCED N A PROCESS FOR CONVERTING A HYDROCARBON CHARGE STOCK CONTAINING SULFUROUS AND NITROGENOUS CONTAMINATNS, IS TREATED TO PRODUCE ELEMENTAL SULFUR AND A TREATED WATER STREAM SUITABLE FOR RECYCLE TO THE HYDROCARBON CONVERSION PROCESS, BY THE STEPS OF: (A) CATALYTICALLY TREATING THE AQUEOUS WASTE STREAM WITH OXYGEN AT OXIDIZING CONDITIONS EFFECTIVE TO PRODUCE AN EFFLUENT STREAM CONTAINING NH4OH, (NH4)2SIO3 AND ELEMENTAL SULFUR OR AMMONIUM POLYSULFIDE; (B) SEPARATING SULFUR FROM THE EFFLUENT STREAM FROM STEP (A) TO PRODUCE AN AQUEOUS EFFLUENT STREAM CONTAINING (NH4)2S2O3; AND (C) TREATING THE AQUEOUS STREAM FROM STEP (B) WITH CARBON MONOXIDE AT REDUCTION CONDITIONS EFFECTIVE TO FORM A SUBSTANTIALLY THIOSULFATE-FREE TREATED WATER STREAM. KEY FEATURE OF THE TREATMENT METHOD IS THE USE OF A CARBON MONOXIDE REDUCTION STEP TO ENABLE THE CONTINUOUS RECYCLE OF THE TREATED WATER STREAM BACK TO THE HYDROCARBON CONVERSION PROCESS WITH CONSEQUENTIAL ABATEMENT OF WATER POLLUTION PROBLEMS AND SUBSTANTIAL REDUCTION OF REQUIREMENTS FOR MAKE-UP WATER.
Inventors
- 👤 Peter Urban
- 👤 Robert H Rosenwald
Bibliographic Details
Claims Analysis
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