Recovery of sulfur values from spent sulfuric acid

Details Recovery of sulfur values from spent sulfuric acid Recovery of sulfur values from spent sulfuric acid

C - Chemistry, Metallurgy

01

B

23/123

C01B 17/58 (2006.01)

Patent

CA 1073634

INVENTION: RECOVERY OF SULFUR VALUES FROM SPENT SULFURIC ACID INVENTORS: T. S. HARRER B. I. KARSAY R. L. STURTEVANT ABSTRACT OF THE DISCLOSURE Improvement in the method for recovering sulfur values in the form of sulfur dioxide from spent sulfuric acid by decom- posing the spent sulfuric acid at elevated temperature in the presence of elemental sulfur to generate a sulfur dioxide-containing gas stream, which involves: (a) introducing the spent sulfuric acid into a pool of molten sulfur maintained at temperature of at least about 250°C. to thereby generate a gaseous stream comprising sulfur dioxide, vaporous elemental sulfur, and water; (b) cooling said gaseous stream to temperature above the melting point of the sulfur but below about 160°C. to condense elemental sulfur there- from, separating the condensed elemental sulfur and returning it to the pool of molten sulfur; followed by (c) further cooling the gaseous stream from which elemental sulfur has been condensed to condense water therefrom, and separating the condensed water from the gaseous stream.

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