Process for removal of sulfur dioxide from gases

Abstract

An improvement is provided in the regeneration system of agueous regenerative processes for the removal of SO.sub.2 from SO.sub.2 -containing gas streams which have a scrubbing system containing (1) a scrubbing zone through which a recirculating stream of sodium, potassium or ammonium thiosulfate solution continuously passes as a vehicle for the SO.sub.2 absorbent--sodium, potassium, or ammonium carbonate--under conditions favorable to the formation of sulfite by the reaction of carbonate and SO.sub.2 and (2) a thiosulfate generation zone in which the sulfite is converted by sulfide to thiosulfate. The improvement comprises converting in a regenerating system, the net make of thiosulfate to sulfide and carbonate by converting one portion of the thiosulfate to formate and the reacting the other portion with said formate.

Description

Continuations (1)

	Number	Date	Country
Parent	966685	Dec 1978