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:
May. 13, 1986
Filed:
Jan. 28, 1985
Ralph Miller, Pleasantville, NY (US);
Other;
Abstract
This invention is a regenerable process for producing gaseous hydrogen sulfide in concentrated form from sulfur dioxide obtained from a dilute gas source by (1) reacting the SO.sub.2 with a concentrated solution of Na.sub.2 SO.sub.3 to form Na.sub.2 S.sub.2 O.sub.5 in solution and then either: (2) reacting the Na.sub.2 S.sub.2 O.sub.5 with Na.sub.2 CO.sub.3 to form solid Na.sub.2 SO.sub.3, a concentrated solution of Na.sub.2 SO.sub.3 which is recycled to the SO.sub.2 reaction and concentrated gaseous CO.sub.3 which is used in a subsequent step, (3) reducing the Na.sub.2 SO.sub.3 to Na.sub.2 S, (4) reacting the Na.sub.2 S with solid NaHCO.sub.3 to form gaseous H.sub.2 S and Na.sub.2 CO.sub.3, (5) recycling part of the Na.sub.2 CO.sub.3 to (2) above and reacting the remainder with concentrated CO.sub.2 from (2) above to form solid NaHCO.sub.3 and recycling the solid NaHCO.sub.3 to (4) above, or; (2) reacting the Na.sub.2 S.sub.2 O.sub.5 with NaHCO.sub.3 to form solid Na.sub.2 SO.sub.3, a concentrated solution of Na.sub.2 SO.sub.3 which is recycled to the SO.sub.2 reaction, and concentrated, gaseous CO.sub.2 which is used in a subsequent step, (3A) reducing the Na.sub.2 SO.sub.3 to Na.sub.2 S, (4A) reacting the Na.sub.2 S in solution with water and gaseous CO.sub.2 from (2A) above to form gaseous H.sub.2 S and solid NaHCO.sub.3 and (5A) recycling the solid NaHCO.sub.3 to (2A) above.