Process for removing sulfur-containing gases from waste gases

Details Process for removing sulfur-containing gases from waste gases Process for removing sulfur-containing gases from waste gases

1975-12-22

1977-11-29

Vertiz, O. R.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

423431, 423561A, 423561R, 423573R, B01J 800, C01B 1700, C01F 524, C01B 1702

Patent

active

040605884

ABSTRACT:
Sulfur-containing compounds, particularly sulfur dioxide, are removed from stack gas streams by wet scrubbing the gases wherein an alkaline earth metal sulfate and/or sulfite are formed. Example processes are lime/limestone and Double Alkali scrubbing processes. These processes produce sludge material containing primarily the alkaline earth metal sulfate which is disposed of only with significant difficulty. An improvement is described herein whereby the aqueous sludge is reduced in contact with sufficient coal to produce the corresponding sulfide and effluent gases from the reduction step having a sufficient heating value to be used to dry the mixture of sludge and coal prior to the reducing step. The alkaline earth metal carbonate and elemental sulfur are recovered from the sulfide.

REFERENCES:
patent: 3574530 (1971-04-01), Suriani et al.
patent: 3599610 (1971-08-01), Spector
patent: 3625164 (1971-12-01), Spector
patent: 3784680 (1974-01-01), Strong et al.

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