Corrosion inhibitors for aqueous systems

• US 6,572,789 B1
• Filed: 12/06/2001
• Issued: 06/03/2003
• Est. Priority Date: 04/02/2001
• Status: Expired due to Term

• Current Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Original Assignee: ONDEO Nalco Company (Ecolab, Inc.)
• Inventors: Reed, Peter E., Morris, John D., Yang, Bo
• Primary Examiner(s): ANTHONY, JOSEPH DAVID
• Application Number:
  US10/010,021
• Time in Patent Office: 544 Days
• Field of Search: 252/387, 252/389.23, 252/389.24, 252/397, 252/400.23, 252/400.24, 252/80, 252/82, 422/12, 422/13, 422/15, 210/699, 210/697
• US Class Current: 252/389.23
• CPC Class Codes: C02F 2103/023 Water in cooling circuits
• CPC Class Codes: C02F 5/14 containing phosphorus
• CPC Class Codes: C02F 5/145 combined with inorganic substances
• CPC Class Codes: C09K 5/10 Liquid materials
• CPC Class Codes: C09K 8/54 Compositions for in situ inhibition of corrosion in boreholes or wells
• CPC Class Codes: C23F 11/10 using organic inhibitors
• CPC Class Codes: C23F 11/128 Esters of carboxylic acids
• CPC Class Codes: C23F 11/167 Phosphorus-containing compounds
• CPC Class Codes: C23F 11/173 Macromolecular compounds
• CPC Class Codes: C23F 14/02 by chemical means

Abstract

A method of inhibiting corrosion in aqueous systems comprising adding to the system a composition comprising mono, bis and oligomeric phosphinosuccinic acid adducts and a method of preparing a composition comprising mono, bis and oligomeric phosphinosuccinic acid adducts comprising adding hypophosphite to fumaric acid slurry or solution in water to create a reaction mixture; and effecting a reaction by introducing a free radical initiator to the reaction mixture.

Claims

1. A method of inhibiting corrosion in aqueous systems comprising adding to the system a phosphonosuccinic acid composition comprising mono, bis and oligomeric phosphinosuccinic acid adducts, wherein the phosphinosuccinic acid composition comprises about 36 to about 49 mole percent bis phosphinosuccinic acid adducts and about 26 to about 35 mole percent oligomeric phosphinosuccinic acid adducts.

2. The method of claim 1 wherein the aqueous system is an industrial aqueous system.

3. The method of claim 1 wherein the industrial aqueous system is a cooling water system.

4. The method of claim 1 further comprising adding to the aqueous system an effective amount of one or more ferrous metal corrosion inhibitors, yellow metal corrosion inhibitors, scale inhibitors, dispersants, biocides, and industrial aqueous system additives.