Process for removing oxides of nitrogen and sulfur from exhaust

Details Process for removing oxides of nitrogen and sulfur from exhaust Process for removing oxides of nitrogen and sulfur from exhaust

1975-05-20

1977-07-26

Vertiz, O. R.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

423242, 423351, C01B 2100

Patent

active

040383687

ABSTRACT:
A process for wet-treating an exhaust gas to remove oxides of sulfur and of nitrogen including:
1. washing the exhaust gas with a slurry containing one or more magnesium compounds to remove oxides of sulfur from the exhaust gas;
2. washing the exhaust gas treated in step (1) with an aqueous solution of an alkali metal iodide and/or an alkaline earth metal iodide to remove the oxide of nitrogen; and
3. contacting the slurry from step (1) with the aqueous solution from step (2) to regenerate the solution of alkali metal iodide and/or alkaline earth metal iodide and to decompose any nitrite formed in step (2) to nitrogen.

REFERENCES:
patent: 1918622 (1933-07-01), van der Melilen
patent: 2800390 (1957-07-01), Behrman
patent: 2828184 (1958-03-01), Behrman
patent: 3733393 (1973-05-01), Couillaud et al.
patent: 3758668 (1973-11-01), Lapple et al.
patent: 3904742 (1975-09-01), Akimoto
Chem. Abstracts-Vol. 37-No. 3999-4000-1943.

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