Compositions – Water-softening or purifying or scale-inhibiting agents – Plant or organic material containing
Patent
1990-11-13
1991-06-11
Willis, Prince E.
Compositions
Water-softening or purifying or scale-inhibiting agents
Plant or organic material containing
252181, 252 80, 252 82, C00F 510
Patent
active
050230115
ABSTRACT:
An in-service formulation for the removal of scale deposits from metallic working surfaces of cooling towers and for the ongoing prevention of build-up of such deposits on cooling tower surfaces, with such deposits commonly consisting of insoluble salts of calcium together with oxides of iron. The formulation comprises a blend of selected phosphonates, one or more scale-modifying polymers, along with one or more chelants. Sodium gluconate is utilized for its ability to inhibit corrosion of ferrous surfaces as well as its synergistic effect in conjunction with other constituents for the removal of scale components (as demonstrated in U.S. Pat. No. 4,279,768). In those systems having non-ferrous metallic surfaces, such surfaces have been found to be adequately protected by the formulation through the incorporation of a triazole inhibitor. The formulation of the present invention provides a significant capacity for the removal of scale while remaining fully compatible with the water present in the system during and after scale removal, and the materials remain effective with contaminants present in the cooling water following a substantial number of cycles of concentration.
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Busch Bruce D.
Nicholls Jeffrey R.
Fremont Industries, Inc.
Silbermann James
Willis Prince E.
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