Stabilization of catalyzed aqueous sulfite and bisulfite ion solutions
AssigneeBetzDearborn Inc.
InventorsGregory J. Pomrink, Bruce K. Fillipo, Eric R. Carver, Paul R. Burgmayer
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Abstract
A method for stabilizing an aqueous solution containing sulfite or bisulfite ions and a water-soluble metal catalyst. The method comprises incorporating a stabilizing amount of a alpha substituted carboxylic acid or salt thereof or a vinyl carboxylic acid or salt thereof in the solution. The carboxylic acid inhibits sludge formation when the aqueous solution is stored. The preferred carboxylic acid, citric acid, also enhances the oxygen scavenging rate of the sulfite and bisulfite when the solution is used to treat aqueous systems for oxygen removal.
Claims9
A method for stabilizing an aqueous solution containing sulfite or bisulfite ion oxygen scavengers and a cobalt catalyst against precipitation without diminishing the catalytic effect of the cobalt catalyst, said method comprising adding to said solution a citric acid or salt thereof effective as a stabilizer, in an amount effective for the purpose of solution stabilization.
A method of increasing the oxygen scavenging rate of cobalt catalyzed sulfite or bisulfite in an aqueous solution, said method comprising incorporating in said solution citric acid or salts thereof, in an amount effective for the purpose of increasing the oxygen scavenging rate.
A method for inhibiting the formation of insoluble sludges in an aqueous solution containing sulfite or bisulfite ions and a water-soluble cobalt catalyst, and for increasing the oxygen scavenging rate of said sulfite or bisulfite ions and said catalyst, said method comprising adding to said solution an amount of citric acid or salts thereof effective as a solution stabilizer and effective as an oxygen scavenging rate increaser.
Dependencies are inferred from the claim text.