Cyclohexanedione oxygen scavengers
AssigneeBetz Laboratories, Inc.
InventorPaul V. Roling
Life of this patent
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Abstract
An oxygen scavenger for aqueous mediums is disclosed. The oxygen scavengers comprise cyclohexanediones which, when added to basic aqueous solutions, effectively scavenge oxygen from the aqueous solutions. The oxygen scavenger has particular utility as an oxygen scavenger from water in heating systems such as boilers and heat exchangers.
Claims15
A method for reducing the amount of oxygen in an aqueous solution comprising adding to an oxygen containing aqueous solution having a pH greater than 7 an oxygen scavenging amount of a cyclohexanedione effective as an oxygen scavenger to reduce the amount of oxygen in said solution.
A method for reducing the amount of oxygen in an aqueous solution comprising adding to reduce the amount of oxygen in said solution from about 1 ppm to about 10,000 ppm of a composition comprising 1,4-cyclohexanedione to reduce the amount of oxygen in said solution and adding methoxypropylamine to said aqueous solution in an amount sufficient to raise the pH of said aqueous solution to greater than 7.
A method for reducing the amount of oxygen in an aqueous solution comprising adding to an oxygen containing aqueous solution having a pH greater than 7 an oxygen scavenging amount of an oxygen scavenging composition, said composition comprising:
- a) a cyclohexanedione effective as an oxygen scavenger;
- and
- b) an oxygen scavenger selected from the group consisting of hydroquinones, hydroxylamine, hydrazine, dihydroxyacetone, hydroquinone catalyzed furfural, ascorbic acid, isoascorbic acid, water soluble salt forms of ascorbic and isoascorbic acid, salicyclaldehyde catalyzed by hydroquinone, aminophenols and polyethyleneamines to reduce the amount of oxygen in said solution.
Dependencies are inferred from the claim text.