Chemistry of inorganic compounds – Sulfur or compound thereof – Oxygen containing
Patent
1975-11-20
1977-10-11
Vertiz, O. R.
Chemistry of inorganic compounds
Sulfur or compound thereof
Oxygen containing
423525, 423531, 423543, 423DIG2, C01B 1750, C01B 1772, C01B 1790
Patent
active
040535738
ABSTRACT:
Improvement in the method for recovering sulfur values in the form of sulfur dioxide from spent sulfuric acid by decomposing 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.degree. 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.degree. C. to condense elemental sulfur therefrom, 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.
REFERENCES:
patent: 3359069 (1967-12-01), Furkert
patent: 3667908 (1972-06-01), Torrence
patent: 3810968 (1974-05-01), Renault et al.
patent: 3833715 (1974-09-01), Deschamps et al.
Beck et al., Alein Property Custodian, Ser. No. 393,258, July 13, 1943.
Harrer, deceased T. S.
Karsay Bela I.
Sturtevant Robert L.
Allied Chemical Corporation
Fuchs Gerhard H,.
Straub Gary P.
Vertiz O. R.
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