Chemistry of inorganic compounds – Sulfur or compound thereof – Elemental sulfur
Patent
1977-02-16
1978-03-07
Peters, G. O.
Chemistry of inorganic compounds
Sulfur or compound thereof
Elemental sulfur
423567A, 23262, 23283, C01B 1704
Patent
active
040780481
ABSTRACT:
Process and apparatus for removing sulfur dioxide from gases such as stack gases. The gases are scrubbed with an alkali metal compound in an aqueous solution to form alkali metal sulfite/sulfate salts which are then reacted with barium sulfide to precipitate barium sulfite/sulfate and form alkali metal sulfide/bisulfide in solution. The alkali metal sulfide/bisulfide is oxidized to form elemental sulfur and regenerated wash liquid; and the barium sulfite/sulfate is reduced by roasting to form the barium sulfide required. In a preferable embodiment, coal is used as both the reductant and fuel in the roasting of the barium sulfite/sulfate and the stack gases from the roasting are scrubbed along with the primary stack gases. As an optional step a portion of the alkali metal sulfite salts may be oxidized to sulfate prior to reaction with barium sulfide.
REFERENCES:
patent: 1732905 (1929-10-01), Morgen et al.
patent: 3752875 (1973-08-01), O'Hern et al.
patent: 3935100 (1976-01-01), Alagy et al.
"Acta Chimica" Academy of Science of Hungary, Budapest, 1953; pp. 130-138.
Combustion Equipment Associates Inc.
Lepper Bessie A.
Peters G. O.
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