Nalco Chemical Company

Binaifer S Khambatta

Donald A Johnson

James F Kneller

Vytas Narutis

Dodd W Fong

Richard J Strittmatter

Kenneth E Fulks

An improved method is disclosed for the preparation of novel alkali metal diphosphinate salts by the reaction of an acetylenic compound with an alkali metal hypophosphite in the presence of a free radical source, the use of these novel compounds in further reactions to prepare diphosphonate compounds and diphosphinate containing adducts, oligomers and polymers and utilization of these compounds, polymers and oligomers to control calcium carbonate scale and mild steel corrosion in cooling water.

Phosphinate compounds prepared from acetylenic compounds and inorganic

Method for the control of calcium carbonate scale using compounds

A method for increasing the effectiveness of ozone as a treating agent for alkaline cooling tower waters. This is accomplished by reducing pH of the solutions in contactor loops which supply ozone to cooling tower waters with an acidic substance.

Method for using ozone in cooling towers

A method of inhibiting corrosion of iron and steel alloys in contact with industrial waters is claimed. The method comprises treating said waters with an effective corrosion inhibiting amount of a water soluble polymer having an average molecular weight ranging from about 2,000 to about 50,000, said polymer containing at least four mole percent of a hydroxamic acid mer unit.

Hydroxamic acid containing polymers used as corrosion inhibitors

We have determined that simultaneous use in industrial waters of certain water soluble polymers in the presence of ozone is acceptable for scale control, corrosion control, microbiological control and the like. The preferred polymers used with ozone and those polymers that are homopolymers and copolymers containing at least 50 mole percent of acrylic acid or methacrylic acid, mixtures thereof. Certain other monomers may be used with the acrylic acid and methacrylic acid monomers, and still function as scale inhibitors and corrosion inhibitors in the presence of ozone in industrial waters. The industrial waters are particularly recirculating cooling waters.

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Orland Park, IL, United States of America

Binaifer S Khambatta