Betz Laboratories, Inc.

Frederick C Klaessig

Donald F Jacques

David W Reichgott

E Paul Holder

Pamela J Peerce-Landers

Methods for removing iron oxide and other accumulated corrosion products from metal surfaces in contact with aqueous systems, such as cooling water systems, are disclosed. The method steps can be performed without requirement of system shutdown and without requirement of acidic conditions. The methods comprise contacting the corroded surface with an organic reductant/chelant and an inorganic reducing agent while the pH of the aqueous system is maintained within the substantially neutral range of about 6.5-7.5. Pyrogallol and methyl gallate may be used as the organic reductant/chelant.

Method and compositions for penetrating and removing accumulated

A method is disclosed for inhibiting soft scale precipitation in black liquor systems by adding thereto polyacrylic acid.

Method for treating black liquor using acrylic acid polymer

A method is disclosed for inhibiting soft scale precipitation in black liquor systems by adding thereto a treatment comprising in combination polyacrylic acid and methyl vinyl ether/maleic anhydride copolymer.

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Doylestown, PA, United States of America

Frederick C Klaessig