US 4,690,807 A · Process for the simultaneous absorption of sulfur oxides and production of ammonium sulfate

Abstract

Process and apparatus for the removal of sulfur oxides from sulfur oxide-containing gas with simultaneous production of ammonium sulfate. The process is carried out in a single vessel having an ammonium sulfate scrubbing zone; an ammonium sulfate liquor reservoir having a neutralization zone, a sulfur oxide oxidation zone, and a product removal zone; and a scrubbed gas removal zone. The sulfur oxide-containing gas is introduced into the ammonium sulfate scrubbing zone and passes countercurrent to droplets or a spray of ammonium sulfate liquor. The ammonium sulfate liquor absorbs the sulfur oxide in the scrubbing zone, and the liquor having the absorbed sulfur oxide therein collects in the ammonium sulfate liquor reservoir where aqueous ammonia is introduced into the neutralization zone and an oxygen-containing gas is introduced into the sulfur oxide oxidation zone. The sulfur oxide is converted to ammonium sulfate which is circulated from the ammonium sulfate liquor reservoir to the ammonium sulfate scrubbing zone. Ammonium sulfate product is removed from the product removal zone.

Claims26

Dependent claims

A multi-step process for treating a gas containing a sulfur oxide in a single vessel comprising:

(a) passing the gas containing sulfur oxide through a spray of aqueous ammonium sulfate in the vessel to form an aqueous ammonium sulfate having sulfur oxide absorbed therein and a scrubbed gas;
(b) collecting in a reservoir in the vessel the aqueous ammonium sulfate having sulfur oxide gas absorbed therein;
(c) introducing aqueous ammonia into the aqueous ammonium sulfate having sulfur oxide gas absorbed therein;
(d) introducing an oxygen-containing gas into the aqueous ammonium sulfate having sulfur dioxide absorbed therein in the reservoir whereby ammonium sulfate product is formed in the reservoir by the reaction of the absorbed sulfur oxide gas with the ammonia in the aqueous ammonia and the oxygen in the oxygen-containing gas;
(e) forming the spray of aqueous ammonium sulfate through which the gas containing sulfur oxide is passed, from aqueous ammonium sulfate liquor removed from the reservoir;
(f) withdrawing scrubbed gas;
and
(g) withdrawing ammonium sulfate product.

5 more elements

Dependencies are inferred from the claim text.

Process for the simultaneous absorption of sulfur oxides and production of ammonium sulfate

Life of this patent

Process for the simultaneous absorption of sulfur oxides and production of ammonium sulfate

Life of this patent

Abstract

Claims26