Process for selectively removing sulfur dioxide

Details Process for selectively removing sulfur dioxide Process for selectively removing sulfur dioxide

1986-09-10

1989-05-30

Doll, John

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

C01B 1700

Patent

active

048349593

ABSTRACT:
Gas feed streams containing sulfur dioxide such as flue gas streams are first contacted with an aqueous solution of inorganic sulfites and bisulfites having a pH range from about 2 to about 6.5 to remove a minor amount of sulfur dioxide. The same gas stream is then contact with a second aqueous solution of sulfites and bisulfites having a pH range from about 7.0 to about 12.5. Alkali metal hydroxide or ammonium hydroxide solution is added to the liquid inlet of the second contactor and the solution of the second contactor is pumped to the liquid inlet of the first contactor.

REFERENCES:
patent: 3790660 (1974-02-01), Earl et al.
patent: 3971844 (1976-07-01), Schneider
patent: 4170628 (1979-10-01), Kosseim et al.
patent: 4201755 (1980-05-01), Nofal

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