Process of treating exhaust gas containing nitrogen oxides and s

Details Process of treating exhaust gas containing nitrogen oxides and s Process of treating exhaust gas containing nitrogen oxides and s

1979-07-16

1981-09-08

Peters, G. O.

Chemistry of inorganic compounds

Nitrogen or compound thereof

Oxygen containing

423242, B01D 5334

Patent

active

042884217

ABSTRACT:
A process of treating an exhaust gas containing NO.sub.x and SO.sub.2 comprising bringing the gas into contact with an absorbing solution containing iron chelate salt and potassium sulfite, cooling the solution to crystallize and separate absorption products of potassium imidodisulfonate, potassium dithionate and potassium sulfate, heating the separated products at 250.degree. to 400.degree. C. to decompose the potassium dithionate into potassium sulfate and sulfur dioxide, then decomposing the potassium imidodisulfonate into ammonia and simultaneously reducing the potassium sulfate into potassium polysulfide and potassium carbonate, and converting the potassium polysulfide into hydrogen sulfide, gaseous sulfur and potassium carbonate.

REFERENCES:
patent: 3904743 (1975-09-01), Urban
patent: 3932587 (1976-01-01), Grantham et al.
patent: 3987147 (1976-10-01), Guerrieri
patent: 3991161 (1976-11-01), Saitoh et al.
patent: 4122148 (1978-10-01), Nicholson et al.
patent: 4141961 (1979-02-01), Miller
patent: 4186176 (1980-01-01), Kitamura et al.

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