Process for absorption of sulfur dioxide and nitric oxide from f

Details Process for absorption of sulfur dioxide and nitric oxide from f Process for absorption of sulfur dioxide and nitric oxide from f

1992-10-21

1994-06-14

Niebling, John

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

42324307, 42324314, 204130, 204131, 204151, 204152, B01D 5334

Patent

active

053208161

ABSTRACT:
The simultaneous abatement of NO and SO.sub.2 in flue gas is provided by an absorption process and apparatus utilizing an absorbent composition comprising an aqueous solution of chelates and sulfite salts. Metal chelates oxidized to an inactive state are electrochemically reduced. In the electrochemical cell, nickel or stainless steel anode materials are stable and may be used in the place of platinum coated anode materials when the anolyte pH is maintained greater than 12. At these conditions, the anode is corrosion resistant with a long operating time between replacement. Ultrafiltration or Donnan dialysis may be used to separate the chelate sorbents from the waste salts to reduce the loss of expensive chelate sorbents. Alternatively, an anionic exchange membrane can be used to electrodialytically separate waste sulfur
itrogen salts from the absorbent solution.

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