Chemistry of inorganic compounds – Sulfur or compound thereof – Elemental sulfur
Patent
1987-02-27
1989-06-06
Doll, John
Chemistry of inorganic compounds
Sulfur or compound thereof
Elemental sulfur
423242, 423422, 423563, B01D 5302, C01B 1704, C01B 1726, C01D 700
Patent
active
048370010
ABSTRACT:
This invention is a regenerable process for producing elemental sulfur from SO.sub.2 initially contained in a dilute gas source by: (1) absorbing the SO.sub.2 in a concentrated Na.sub.2 SO.sub.3 solution to convert most of the Na.sub.2 SO.sub.3 to Na.sub.2 S.sub.2 O.sub.5 ; (2) separating one third of the absorbed SO.sub.2 ; (3) reacting the residual mixture with solid NaHCO.sub.3 to form gaseous carbon dioxide used in a subsequent step and a slurry composed of solid Na.sub.2 SO.sub.3 suspended in a Na.sub.2 SO.sub.3 solution; (4) separating solid Na.sub.2 SO.sub.3 from the solution which is recycled to (1) above; (5) reducing solid Na.sub.2 SO.sub.3 to Na.sub.2 S; (6) reacting the Na.sub.2 S with H.sub.2 O and CO.sub.2 to form solid NaHCO.sub.3 which is recycled to (3) above and gaseous H.sub.2 S; (6) reacting gaseous H.sub.2 S with SO.sub.2 separated in (2) above to form water and elemental sulfur.
REFERENCES:
patent: 690502 (1902-01-01), Wing
patent: 3932587 (1976-01-01), Grantham et al.
patent: 3991162 (1976-11-01), Taylor
patent: 4107015 (1978-08-01), Chlanda et al.
patent: 4241041 (1980-12-01), Farin
patent: 4588567 (1986-05-01), Miller
Doll John
Russel Jeffrey Edwin
T-Thermal Inc.
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