Maleic anhydride homopolymer and maleic acid homopolymer and methods for preparing thereof, and non-phosphorus corrosion inhibitor and use thereof
AssigneeEcolab USA Inc.
InventorsJasbir S. Gill, Peter E. Reed, Santanu Banerjee, Anand Harbindu, Yinyin Tong
Life of this patent
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Abstract
Maleic anhydride homopolymer corrosion inhibitors, maleic acid homopolymer corrosion inhibitors, methods for preparing the same, and methods of inhibiting corrosion are provided. The corrosion inhibitors may exclude phosphorus and may contain a hydrolysate of a maleic anhydride homopolymer or a hydrolysate of a maleic acid homopolymer. The maleic acid homopolymer may include from about 2 to about 5 maleic acid repeating units and the maleic anhydride homopolymer may include from about 2 to about 5 maleic anhydride repeating units.
Claims8
A method of inhibiting corrosion of a metallic surface in an aqueous industrial system, comprising:
- adding a corrosion inhibitor to the aqueous industrial system, wherein the corrosion inhibitor comprises a maleic acid homopolymer having 2 maleic acid repeating units, wherein a weight average molecular weight of the maleic acid homopolymer is in a range of 200 Da to 250 Da, and wherein the corrosion inhibitor excludes phosphorous and molybdates.
A method of inhibiting corrosion of a metallic surface in an aqueous industrial system, comprising:
- adding a corrosion inhibitor to the aqueous industrial system, wherein the corrosion inhibitor comprises a member selected from the group consisting of a hydrolysate of a maleic anhydride homopolymer having 2 maleic anhydride repeating units, a hydrolysate of a maleic acid homopolymer having 2 maleic acid repeating units, and any combination thereof, wherein a molecular weight of the hydrolysate of the maleic anhydride homopolymer or the hydrolysate of the maleic acid homopolymer is in a range from 200 Da to 250 Da, and wherein the corrosion inhibitor excludes phosphorous and molybdates.
A method of inhibiting corrosion of a metallic surface in an aqueous industrial system, comprising:
- adding a corrosion inhibitor to the aqueous industrial system, wherein the corrosion inhibitor comprises:
- a maleic acid homopolymer having 2 maleic acid repeating units;
- and
- a phenylethyl capping group,
- wherein a weight average molecular weight of the maleic acid homopolymer is in a range of 200 Da to 250 Da, and wherein the corrosion inhibitor excludes phosphorous and molybdates.
Dependencies are inferred from the claim text.