Method and composition for removing sulfur dioxide from flue gas

Details Method and composition for removing sulfur dioxide from flue gas Method and composition for removing sulfur dioxide from flue gas

1977-07-18

1979-06-12

Gantz, Delbert E.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

423242, 423244, 252191, B01J 2702, C01B 1700

Patent

active

041579887

ABSTRACT:
In a "first" scrubbing operation, the sulfur dioxide containing flue gas is scrubbed with an aqueous solution containing ferric sulfate and aluminum sulfate. The ferric sulfate oxidizes the sulfur dioxide to sulfuric acid, which dissolves in the solution, and is reduced to ferrous sulfate. In a subsequent "second" scrubbing operation, the solution, now containing ferrous sulfate, aluminum sulfate, and sulfuric acid, is scrubbed with air. This regenerates, or re-oxidizes the ferrous sulfate to ferric sulfate. The presence of aluminum sulfate accelerates the rate of regeneration. The regenerated solution is then returned to its function in a "first" scrubbing operation, and the indicated cycle of "first" and "second" scrubbing operations are repeated.

REFERENCES:
patent: 2021939 (1935-11-01), Johnstone
patent: 2115874 (1938-05-01), Rehm
patent: 2173877 (1939-09-01), Clark et al.
patent: 2188324 (1940-01-01), Walthall
patent: 3238272 (1966-03-01), Nixon
patent: 3836630 (1974-09-01), Noguchi et al.

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