The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 14, 1979
Filed:
Dec. 05, 1978
Metro D Kulik, Pittsburgh, PA (US);
Continental Oil Company, Stamford, CT (US);
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.