Sulfur dioxide scrubbing system

Details Sulfur dioxide scrubbing system Sulfur dioxide scrubbing system

1975-02-24

1976-11-02

Scovronek, Joseph

Chemistry: physical processes

Physical processes

Crystallization

B01J 100, B01J 800

Patent

active

039894649

ABSTRACT:
Sulfur dioxide is scrubbed from stack gases in an absorption device by a sodium-based aqueous scrubbing solution, a portion of which is subsequently and continuously regenerated outside the absorption apparatus by a causticizing reaction with slaked lime. The causticized solution is routed through a settling device wherefrom a portion of the aqueous sediment is returned to the causticizing zone to provide seed crystals which encourage the formation of larger sized solid particles; also, a portion of the aqueous sediment from the settling device is continuously mechanically dewatered and then removed from the system. The liquid effluent solution from the settling device is passed to a solids-contacting and reaction device for mixing with sodium carbonate in order to reduce the calcium ion concentration and the solids content of the solution. The underflow of the solids-contacting device is conveyed back to the causticizing zone and the clarified overflow, i.e., the regenerated scrubbing liquor, is conveyed to the absorption apparatus.

REFERENCES:
patent: 3775532 (1973-11-01), Shah
patent: 3870781 (1975-03-01), Klein et al.

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