Flue gas treatment with intermittent addition of alkaline reagen

Details Flue gas treatment with intermittent addition of alkaline reagen Flue gas treatment with intermittent addition of alkaline reagen

1979-08-30

1981-03-17

Vertiz, O. R.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

C01B 1700

Patent

active

042567130

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. The improvement to the process comprises the cyclic, intermittent, batchwise and rapid addition of the alkaline reagent solution to the scrubbing liquor, the addition beginning upon the scrubbing liquor pH reaching a certain minimum value and ending upon the scrubbing liquor reaching a certain maximum value.

REFERENCES:
patent: 3989797 (1976-11-01), Brady et al.

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