Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1978-12-26
1981-08-18
Vertiz, O. R.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
423558, C01B 1700
Patent
active
042846080
ABSTRACT:
It is known to remove sulfur dioxide from gas streams, particularly waste or flue gases, by contact with aqueous scrubbing solutions containing a metal salt, such as ferric sulfate, in which the valence of the metal is reduced by the sulfur dioxide. It is also known that such scrubbing solutions can be regenerated by oxidizing the reduced metal salt, such as ferrous sulfate, back to the higher valence for further use in removing sulfur dioxide. According to the invention, the regeneration of the scrubbing solution is advantageously effected by electrolytic or anodic oxidation, rather than air oxidation, of the reduced metal salt, since anodic oxidation is not adversely affected by the increase in sulfuric acid content of the scrubbing solution which results from the conversion of the sulfur dioxide absorbed in the scrubbing solution.
REFERENCES:
patent: 2188324 (1940-01-01), Walthall
patent: 3836630 (1974-09-01), Noguchi et al.
patent: 3943228 (1976-03-01), Dezael et al.
patent: 4091075 (1978-05-01), Pessel
patent: 4113588 (1978-09-01), Watanabe et al.
Mellor, Comprehensive Treatise on Inorganic and Theoretical Chemistry, 1935, pp. 262, 266, 303, 304 and 315.
American Electronic Laboratories, Inc.
Heller Gregory A.
Vertiz O. R.
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