Method for removing sulfur dioxide from flue gases

Details Method for removing sulfur dioxide from flue gases Method for removing sulfur dioxide from flue gases

1976-04-19

1978-05-23

Vertiz, O. R.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

423522, C01B 1700, C01B 1772, B01D 53034

Patent

active

040910750

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: 2173877 (1939-09-01), Clark et al.
patent: 3565575 (1971-02-01), Warshaw
patent: 3848058 (1974-11-01), Poncet et al.
patent: 3943230 (1976-03-01), Yamamichi et al.

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