Flue gas treatment

Details Flue gas treatment Flue gas treatment

1979-06-11

1981-02-10

Vertiz, O. R.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

C01B 1700

Patent

active

042501539

ABSTRACT:
An improved process for removing, by absorption, sulfur dioxide from a gaseous mixture such as a flue gas by scrubbing said mixture with an aqueous scrubbing liquor to which a solution of an alkaline reagent such as sodium carbonate is added to maintain alkalinity of the scrubbing liquor. The solution also has dissolved in it a quantity of silica which tends to precipitate when the solution is added to the scrubbing liquor. The silica precipitated in this manner tends to form extremely hard solid deposits in the scrubbing device and associated equipment. If a water soluble salt such as ferrous or ferric sulfate is added to the alkaline reagent solution prior to its use in the process, the precipitate formed has a minimum deleterious effect. The improvement to the process comprises the lowering of the pH of the alkaline reagent solution prior to the addition of the salt, thereby minimizing the amount of salt required.

REFERENCES:
patent: 2088281 (1937-07-01), Smith
patent: 3653812 (1972-04-01), Schneider et al.
patent: 3971844 (1976-07-01), Schneider
patent: 3989797 (1976-11-01), Brady et al.
The Condensed Chemical Dictionary 6 ed., 1962, 1053.

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