Removal of contaminants and recovery of by-products from hot was

Details Removal of contaminants and recovery of by-products from hot was Removal of contaminants and recovery of by-products from hot was

1979-03-05

1981-02-03

Vertiz, O. R.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

423547, C01B 1700

Patent

active

042488427

ABSTRACT:
A process for the removal of sulfur dioxide and other contaminants and the recovery of ammonium sulfate as a by-product from a hot waste gas stream comprising cooling the waste gas stream to a temperature below 120.degree. F., passing said waste gas stream in sequence through at least two separate absorption zones utilizing as an absorbent a recirculated aqueous salt solution of ammonium sulfite-bisulfite, withdrawing and oxidizing a portion of said aqueous ammonium sulfite-bisulfite salt solution under pressures and temperatures sufficient to substantially convert the salts to sulfate salts, and recycling the ammonia and sulfur dioxide vapors liberated during oxidation to the first absorption zone.

REFERENCES:
patent: 1740342 (1929-12-01), Hansen
patent: 1931408 (1933-10-01), Hodsman et al.
patent: 2233841 (1941-03-01), Lepsoe
patent: 3957951 (1976-05-01), Hokanson et al.
Sulfur Oxide Removal From Power Plant Stack Gas-Ammonia Scrubbing-Conceptual Design and Cost Study Series-TVA-Sep. 1970.

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