Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1972-10-26
1976-01-13
Vertiz, Oscar R.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
423422, 423428, 423563, C01B 1700
Patent
active
039325873
ABSTRACT:
A method is shown for removing sulfur dioxide from a hot flue gas by absorption of the sulfur dioxide in an aqueous solution or slurry containing no more than 40 wt.% of an alkali metal carbonate or bicarbonate, preferably sodium carbonate and/or sodium bicarbonate using a spray-dryer scrubber to produce a dry mixture of sodium sulfite, sodium sulfate, and sodium carbonate and/or bicarbonate. Such a mixture is directly suitable as a feed to a regeneration stage.
It is particularly preferred to regenerate the absorbent and recover commercial sulfur values in a closed-cycle process by next treating the solid absorption product in a molten salt reduction step with a reducing agent, preferably a carbonaceous material, to reduce the sodium sulfite and sulfate to sodium sulfide. Concurrently, a source of oxygen is fed to the reducer to generate sufficient heat therein for the reduction step by a combustion reaction. In the subsequent aqueous reformation step, the resulting sodium sulfide-carbonate melt from the reduction step is dissolved in water and reacted with carbon dioxide or a carbon dioxide-yielding material to form hydrogen sulfide as a recoverable product for further processing and regenerate the sodium carbonate-bicarbonate absorbent.
REFERENCES:
patent: 1983789 (1934-12-01), Bradley
patent: 2231309 (1941-02-01), Weber
patent: 3438727 (1969-04-01), Heredy
patent: 3524720 (1970-08-01), Bauer
Gehri Dennis C.
Grantham LeRoy F.
Katz Bruno
Heller Gregory A.
Humphries L. Lee
Kolin Henry
Rockwell International Corporation
Vertiz Oscar R.
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