Cooling water corrosion inhibitor

Details Cooling water corrosion inhibitor Cooling water corrosion inhibitor

1980-10-31

1982-05-04

Richman, Barry

Chemical apparatus and process disinfecting, deodorizing, preser

Process disinfecting, preserving, deodorizing, or sterilizing

Maintaining environment nondestructive to metal

210697, 210699, 210700, 210701, 210765, 252389A, 252396, 422 16, 422 17, 422 18, C23F 1116

Patent

active

043281800

ABSTRACT:
The waters used for cooling generally contain hard ions of the group consisting of calcium and magnesium ions concentration of from about 10 to 600 parts per million. Such waters also contain bicarbonate ions. When cooling waters are recirculated through a cooling tower, they are saturated with oxygen and tend to be corrosive and tend to promote formation of calciferous scale. Such propensities are inhibited by the injection of appropriate chemicals so that the inhibited water contains dispersants effective in dispersing incipient calcium compounds and inhibiting calciferous scale, so that the inhibited water contains a plurality of components forming a dynamic layer on metal surfaces protecting such metal from oxidation. The inhibited water contains about 1 part per million of polyacrylic acid having a molecular weight of about 1,000 and terminated by thioglycolic acid, plus about 2 parts per million of dispersants comprising both sodium sulfonate dispersants and phosphate ester salt types of dispersants plus about 300 parts per billion of a mixture of organic phosphonates selected from the group consisting of diphosphonates, triphosphonates, tetraphosphonates and polyphosphonates, plus about 400 parts per billion of an aromatic trizaole, plus about 6 parts of added phosphate. The effluent from such cooling water has a sufficiently low concentration of toxic components to be suitable for discharge into some natural streams.

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