Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1974-08-23
1976-05-18
Vertiz, Oscar R.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
C01B 1700
Patent
active
039579514
ABSTRACT:
A process for removing sulfur dioxide and other contaminants from a hot waste gas stream in which the waste gas stream is cooled to a temperature below 100.degree.F and then passed in sequence through two separate absorption zones utilizing as the absorbent a recirculated aqueous solution of ammonium sulfite-bisulfite salts. Heat is continuously withdrawn from the recirculated salt solution in each zone. The absorbent solution in the first zone has an initial pH of from 6 to 7.2 and a salt concentration of from 1 to 20% by weight. The absorbent solution in the second zone has an initial pH of from 5.2 to 6.5 and a salt concentration, lower than said first zone of, from 0.1 to 5% by weight. The process provides for the efficient absorption and substantial removal of SO.sub.2, SO.sub.3 and particulate contaminants and for the economic recovery and use of heat from stack gases of a variety of industrial and commercial operations.
REFERENCES:
patent: 2134481 (1938-10-01), Johnstone
patent: 2233841 (1941-03-01), Lepsoe
patent: 3645671 (1972-02-01), Griffin et al.
patent: 3733777 (1973-05-01), Huntington
patent: 3822339 (1974-07-01), Mizuno et al.
Button Edward F.
Hokanson Allan E.
Katzen Raphael
Heller Gregory A.
Holt Harold J.
International Telephone and Telegraph Corporation
Raden James B.
Vertiz Oscar R.
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