Method for regenerating iron-EDTA solutions used for scrubbing p

Details Method for regenerating iron-EDTA solutions used for scrubbing p Method for regenerating iron-EDTA solutions used for scrubbing p

1976-07-01

1978-05-23

Vertiz, O. R.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

423242, 423243, C01B 2100

Patent

active

040910741

ABSTRACT:
A method for purifying industrial exhaust gases containing nitrogen oxides and sulfur oxides, by treating the gases with a circulating absorbing solution containing Fe-EDTA complex salt and ammonium sulfite is provided.
The treatment comprises a combination of the main absorbing step with the following steps:
(a) a circulation step of the absorbing solution in part or total, (b) an oxidation step of sulfite, (c) a separation step of EDTA, (d) a decomposition step of dithionate, etc., (e) a separation step of iron compound, and (f) a separation step of ammonium sulfate.
According to this invention, a long time continuous operation for said purification is possible.

REFERENCES:
patent: 3329478 (1967-07-01), Garlet et al.
patent: 3984522 (1976-10-01), Saito et al.
patent: 3991161 (1976-11-01), Saitoh et al.
patent: 3992508 (1970-11-01), Saitoh et al.
patent: 4013430 (1977-03-01), Adachi
Chem. Abstr. - 85: 12986a.
Chem. Abstr. - 85: 12987o.

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