Process for removing SO.sub.2 from effluent gases and for removi

Details Process for removing SO.sub.2 from effluent gases and for removi Process for removing SO.sub.2 from effluent gases and for removi

1978-05-30

1979-10-09

Vertiz, O. R.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

423242, C01B 1700

Patent

active

041706285

ABSTRACT:
Improvement in processes for the selective removal of sulfur dioxide with respect to carbon dioxide from a gas mixture containing same wherein the gas mixture is contacted with an aqueous absorbent solution, such as alkanolamine, alkali metal hydroxide, ammonium hydroxide or sulfites thereof, to remove sulfur dioxide from the gas mixture and form a SO.sub.2 -rich aqueous absorbent solution which is moved to a stripping zone where sulfur dioxide is driven off to form a SO.sub.2 -depleted aqueous absorbent solution which is recycled and re-contacted with the gas mixture, the improvement comprising removing sulfur oxyanions of heat stable salts which accumulate in the aqueous absorbent solution by contacting a portion of it with an anion exchange resin having hydroxyl anions displaceable by the heat stable sulfur oxyanions whereby the hydroxyl anions of the resin are replaced by the heat stable divalent sulfur oxyanions which are thus taken out of the solution. The anion exchange resin preferably is a strong base anion exchange resin which can be regenerated by contacting it with aqueous sodium hydroxide to replace the heat stable sulfur oxyanions on said resin with hydroxyl anions.

REFERENCES:
patent: 1639905 (1927-08-01), Sperr et al.
patent: 2713077 (1955-07-01), Reeve
patent: 3330621 (1967-07-01), Vian-Ortuno et al.
patent: 3896214 (1975-07-01), Newman
patent: 3904735 (1975-09-01), Atwood et al.
patent: 4071602 (1978-01-01), Pearce

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