Process for removing SO.sub.2 and NO.sub.x from gases

Details Process for removing SO.sub.2 and NO.sub.x from gases Process for removing SO.sub.2 and NO.sub.x from gases

1982-06-28

1984-04-24

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

423239, 423242, 423244, 423561R, 423561A, 423571, C01B 2100, C01B 1700

Patent

active

044447361

ABSTRACT:
A process for removing SO.sub.2 and NO.sub.x from waste gas and recovering sulfur comprising scrubbing the waste gases with a water slurry of FeS in the presence of FeSO.sub.4 and Na.sub.2 SO.sub.4. SO.sub.2 is captured by the formation of FeS.sub.2 and FeSO.sub.4 in the scrubber. By thermal regeneration in a reducing atmosphere the FeS.sub.2 is converted to FeS and Na.sub.2 SO.sub.4 to Na.sub.2 S. The FeS is recycled to the scrubber. The Na.sub.2 S is returned to the system reacting with FeSO.sub.4 to form Na.sub.2 SO.sub.4 and FeS. The last reaction reduces the amount of FeSO.sub.4 entering the regenerator where by an undesirable side reaction, it may be partially converted to SO.sub.2 and Fe.sub.3 O.sub.4.

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Thermal Decomposition of Iron Sulphates II, Huuska et al., J. Appl. Chem. Biotechnol., 1976, 26, 729-734.

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