Regenerative process for flue gas desulfurization

Details Regenerative process for flue gas desulfurization Regenerative process for flue gas desulfurization

1976-12-17

1978-04-11

Peters, G. O.

Chemistry of inorganic compounds

Sulfur or compound thereof

Elemental sulfur

423571, 423574L, 423578, C01B 1704

Patent

active

040839443

ABSTRACT:
A continuous process is disclosed for removing sulfur dioxide from stack gases or other gaseous effluents without prior gas cleaning or dust removal and for converting the sulfur values to industrially useable elemental sulfur. The uncleaned gaseous effluent is scrubbed using a buffered absorbent to absorb the SO.sub.2 and remove particulate material, and the undissolved particulate material is removed from the scrubbing liquor as by filtration. The scrubbing liquor is then contacted with sulfide ion to form elemental sulfur while regenerating the absorbent in the liquor. Most of the liquor is separated from the precipitated sulfur and solid impurities, and the remaining material is heated to permit gravity separation of molten sulfur, scrubbing liquor and impurities. The separated scrubbing liquor is recycled for the scrubbing steps.
The process is particularly advantageous when employing a sulfide ion source, such as sodium bisulfide or the like, to precipitate elemental sulfur. The NaHS solution is regenerated, for example by treating a portion of the scrubber effluent with calcium sulfide.

REFERENCES:
patent: 1990602 (1935-02-01), Guennsey et al.
patent: 3535083 (1970-10-01), Smith
patent: 3600131 (1971-08-01), Shah
patent: 3773900 (1973-11-01), Roberts et al.

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