Polymers and use thereof as scale inhibitors
AssigneeOndeo Nalco Company
InventorsSergey M. Shevchenko, Prasad Y. Duggirala
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Abstract
Compositions and methods for inhibiting scale are provided. Pursuant to the present invention, a composition for inhibiting scale is provided that includes a carbohydrate polymer having both nitrogen-containing groups and carboxyl groups. The nitrogen-containing groups include amino groups, amido groups and mixtures thereof. The present invention has been found useful for inhibiting scale in industrial waters, such as, pulp bleach plant process waters which contain calcium oxalate and barium sulfate scale.
Claims20
A polymer comprising repeating mer units of the formula:
- where X is selected from the group consisting of CO, C(H)OH, and mixtures thereof, R is selected from the group consisting of H, alkyl groups, acyl groups, and mixtures thereof, and n is an integer from 1 to 400,000.
A method of producing a polymer, the method comprising the steps of:
- providing a base polymer;
- oxidizing the base polymer in a solution containing an oxidizing agent;
- and
- recovering a polymer comprising repeating mer units of the formula:
- where X is selected from the group consisting of CO, C(H)OH, and mixtures thereof:
- R is selected from the group consisting of H, alkyl groups, acyl groups, and mixtures thereof, and n is an integer from 1 to 400,000.
A method for inhibiting scale derived from an industrial water system containing an amount of scale, the method comprising the steps of:
- providing a polymer comprising repeating mer units of the formula:
- where X is selected from the group consisting of CO, C(H)OH, and mixtures thereof;
- and R is selected from the group consisting of H, alkyl groups, acyl groups, and mixtures thereof;
- and n is an integer from 1 to 400,000;
- and adding an effective amount of said polymer to the industrial water system.
Dependencies are inferred from the claim text.