Recovery of concentrated H.sub.2 S from SO.sub.2 contained in fl

Details Recovery of concentrated H.sub.2 S from SO.sub.2 contained in fl Recovery of concentrated H.sub.2 S from SO.sub.2 contained in fl

1985-01-28

1986-05-13

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

423428, 423438, 423563, C01B 1700, C01B 3120, C01B 1760

Patent

active

045885672

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.

REFERENCES:
patent: 651569 (1900-06-01), Howard
patent: 3542511 (1970-11-01), Shah
patent: 4141961 (1979-02-01), Miller
patent: 4340572 (1982-07-01), Ben-Shmuel et al.

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