Treating a water stream containing a sulfite compound to produce elemental sulfur
Abstract
Abstract A WATER STREAM CONTAINING A WATER-SOLUBLE SULFITE COMPOUND IS TREATED IN ORDER TO PRODUCE ELEMENTAL SULFUR WHILE MINIMIZING THE FORMATION OF SULFATE BY-PRODUCTS BY THE STEPS OF: (A) CONVERTING THE SULFITE COMPOUND CONTAINED IN THE WATER STREAM TO THE CORRESPONDING THIOSULFATE COMPOUND; (B) TREATING THE RESULTING THIOSULFATE COMPOUND WITH A WATER-SOLUBLE SULFIDE COMPOUND AND A REDUCING AGENT, SELECTED FROM THE GROUP CONSISTING OF CARBON MONOXIDE, HYDROGEN AND MIXTURES THEREOF, AT REDUCTION CONDITIONS SELECTED TO RESULT IN AN EFFLUENT STREAM CONTAINING A POLYSULFIDE COMPOUND; (C) DECOMPOSING THE RESULTING POLYSULFIDE COMPOUND TO FORM ELEMENTAL SULFUR, A SULFIDE COMPOUND, A TREATED WATER STREAM AND; (D) RECOVERING THE RESULTING SULFIDE COMPOUND AND PASSING SAME TO STEP (B). PRINCIPAL UTILITY OF THIS TREATMENT PROCEDURE IS ASSOCIATED WITH THE REGENERATION OF A SULFITE-CONTAINING ABSORBENT STREAM WHICH IS COMMONLY PRODUCED BY CONTACTING A FLUE GAS STREAM CONTAINING SULFUR DIOXIDE WITH A SUITABLE AQUEOUS ABSORBENT STREAM CONTAINING AN ALKALINE REAGENT.
Inventors
- 👤 P Urban
Bibliographic Details
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