Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1990-07-09
1991-11-19
Straub, Gary P.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
423153, 423566, 423567A, 423571, C01G 100, C01B 1700, C01F 774
Patent
active
050664700
ABSTRACT:
In accordance with the invention, gases containing sulfur dioxide are passed through a solution rich in ferric iron and containing barium chloride or calcium chloride. Sulfur dioxide is oxidized by the ferric ion to sulfur trioxide when then forms sulfuric acid in the water. The sulfuric acid reacts with the barium ion to form barium sulfate, while the ferric ion is reduced to the ferrous state. The barium sulfate is separated from the mother liquor by filtration and is then reduced to barium sulfide with a carbonaceous material or any reducing gas. Then, the barium sulfide is reacted with another portion of solution rich in ferric iron to form elemental sulfur, while the barium ion or calcium ion combines with the chloride ion to regenerate barium chloride or calcium chloride as the case may be. The resulting solution, after the sulfur has been removed, is now rich in ferrous iron. This ferrous solution is combined with the solution from which the barium sulfate has been removed and is subjected to oxidation with oxygen, air, or other oxidizing gases. A portion of the oxidized solution, now rich in ferric iron, is recycled to be in contact with the sulfur dioxide-containing gas and another portion is used to react with the barium sulfide. In such a sequence of operations, a processing cycle is completed. Practically all of the sulfur dioxide in a flue gas can be removed using this process.
REFERENCES:
patent: 2021936 (1935-11-01), Johnstone
patent: 3632306 (1972-01-01), Fisher et al.
patent: 3848058 (1974-11-01), Poncet et al.
patent: 3864223 (1975-02-01), Colwell
patent: 4078048 (1978-03-01), Naokarni
Straub Gary P.
Vanoy Timothy C.
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