Chemistry of inorganic compounds – Sulfur or compound thereof – Elemental sulfur
Patent
1978-12-05
1979-08-14
Peters, G. O.
Chemistry of inorganic compounds
Sulfur or compound thereof
Elemental sulfur
423242, 423431, 423512A, 423571, C01B 1704
Patent
active
041645545
ABSTRACT:
A method for converting calcium sulfoxy compounds selected from the group consisting of CaSO.sub.x and Ca(HSO.sub.x).sub.2 where x is 3 or 4, into calcium carbonate by a method consisting essentially of: (a) converting the Ca(HSO.sub.x).sub.2 compounds into CaSO.sub.x compounds by reacting the CA(HSO.sub.x).sub.2 compounds with CaCO.sub.3 in the presence of water; (b) reacting the CaSO.sub.x compounds with NH.sub.3 and CO.sub.2 in the presence of water to produce NH.sub.4 HSO.sub.x and CaCO.sub.3 ; (c) separating the NH.sub.4 HSO.sub.x and CaCO.sub.3 ; (d) reacting the NH.sub.4 HSO.sub.x with H.sub.2 S to produce ammonium polysulfide (NH.sub.4).sub.2 S.sub..omega. wherein .omega. is from 1 to about 4; (e) decomposing the ammonium polysulfide to produce NH.sub.3, H.sub.2 S, elemental sulfur and water; and (f) recovering the elemental sulfur from the NH.sub.3, H.sub.2 S and water.
REFERENCES:
patent: 2073039 (1937-03-01), Wilton et al.
patent: 3687620 (1972-08-01), Witte et al.
patent: 3714338 (1973-01-01), Urban
patent: 3846535 (1974-11-01), Fonseca
patent: 3904743 (1975-09-01), Urban
patent: 4060588 (1977-11-01), Mandelik
Continental Oil Company
Mikesell, Jr. William A.
Peters G. O.
Scott F. Lindsey
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