Process for purifying gaseous effluents

Details Process for purifying gaseous effluents Process for purifying gaseous effluents

1980-02-01

1981-10-20

Thomas, Earl C.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Organic component

423238, 423242, 585857, 585861, B01D 5334

Patent

active

042960819

ABSTRACT:
A process for purifying gaseous effluents containing aldehydes comprises submitting the gaseous effluents to the simultaneous action of SO.sub.2 and NH.sub.3 followed by washing with water. The ratio of the required quantities of NH.sub.3 and SO.sub.2 is between 2:1 and 3:1.
When the gas to be purified naturally contains NH.sub.3, as is for instance the case in rendering plants, the quantity of NH.sub.3 to be added to the gas is reduced accordingly. Conversely when the gas to be treated naturally contains SO.sub.2, the quantity of SO.sub.2 to be added to the gas is also reduced accordingly. The most favorable ratio would correspond to a pH of the washing waters of between 7 and 7.5. ;

REFERENCES:
patent: 2110971 (1938-03-01), Carter
patent: 2460056 (1948-01-01), Yowell et al.
patent: 3909408 (1975-09-01), Ishida et al.
patent: 4158045 (1979-06-01), Schaffer et al.
Dickerson et al., "Scope of Wet Scrubbers for Odor Control", Annals of the New York Academy of Sciences, vol. 237, pp. 374--388, 1974.

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