Method for removing SO.sub.2 and NO.sub.x simultaneously from th

Details Method for removing SO.sub.2 and NO.sub.x simultaneously from th Method for removing SO.sub.2 and NO.sub.x simultaneously from th

1975-04-30

1976-05-25

Peters, G. O.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

423242, B01D 5334

Patent

active

039594408

ABSTRACT:
NO.sub.x gas remaining in a purified exhaust, which has been desulfurized, in accordance with a publicly known method using coke oven gas, by washing the original exhaust containing SO.sub.2 and NO.sub.x with a water solution mainly consisting of ammonium sulfite concentrated to about 30 percent by weight, the pH value and the temperature thereof being adjusted to 6.1 to 6.5 and 50.degree. to 55.degree.C respectively, can be reformed into harmless N.sub.2 by passing said desulfurized exhaust through a reducing catalyst at a temperaure of 200.degree. to 450.degree.C, wherein ammonia gas naturally brought into said desulfurized exhaust from the washing solution acts as a reducing agent.

REFERENCES:
patent: 3822339 (1974-07-01), Mizuno et al.
patent: 3864451 (1974-02-01), Lee et al.
Markvart et al., "Journal of Catalysis" Vol. 7, No. 3, Mar. 1967; pp. 279-281.

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