Maleic anhydride homopolymer and maleic acid homopolymer and methods for preparing thereof, and non-phosphorus corrosion inhibitor and use thereof

Patent metadata

Field	Value
Publication number	US-2018305617-A1
Application number	US-201615768089-A
Country	US
Kind code	A1
Filing date	Oct 17, 2016
Priority date	Oct 16, 2015
Publication date	Oct 25, 2018
Grant date	—

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.

First claim

1 . 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 anhydride homopolymer having from about 2 to about 5 maleic anhydride repeating units, wherein a weight average molecular weight of the maleic anhydride homopolymer is in a range of about 200 Daltons (Da) to about 600 Da.

2 . The method of claim 1 , wherein the maleic anhydride homopolymer comprises a capping group selected from the group consisting of benzyl, methylbenzyl, phenylethyl, hydrogen, and any combination thereof.

3 . The method of claim 1 , wherein the corrosion inhibitor excludes phosphorus.

4 . The method of claim 1 , wherein the corrosion inhibitor comprises a member selected from the group consisting of a maleic acid homopolymer, a hydrolysate of a maleic anhydride homopolymer, a hydrolysate of a maleic acid homopolymer, a zinc salt, a molybdate, a tungstate, a silicate, and any combination thereof.

5 . The method of claim 1 , wherein the maleic anhydride homopolymer comprises 2 or 3 maleic anhydride repeating units.

6 . 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 from about 2 to about 5 maleic acid repeating units, wherein a weight average molecular weight of the maleic acid homopolymer is in a range of about 200 Da to about 600 Da.

7 . The method of claim 6 , wherein the maleic acid homopolymer comprises a capping group selected from the group consisting of benzyl, methylbenzyl, phenylethyl, hydrogen, and any combination thereof.

8 . The method of claim 6 , wherein the corrosion inhibitor excludes phosphorus.

9 . The method of claim 6 , wherein the corrosion inhibitor comprises a member selected from the group consisting of a maleic anhydride homopolymer, a hydrolysate of a maleic anhydride homopolymer, a hydrolysate of a maleic acid homopolymer, a zinc salt, a molybdate, a tungstate, a silicate, and any combination thereof.

10 . The method of claim 6 , wherein the maleic acid homopolymer comprises 2 or 3 maleic acid repeating units.

11 . 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, a hydrolysate of a maleic acid homopolymer, 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 about 200 Da to about 600 Da.

12 . The method of claim 11 , wherein the corrosion inhibitor excludes phosphorus.

13 . The method of claim 11 , wherein the corrosion inhibitor comprises a member selected from the group consisting of a maleic acid homopolymer, a maleic anhydride homopolymer, a zinc salt, a molybdate, a tungstate, a silicate, and any combination thereof.

14 . The method of claim 11 , wherein the hydrolysate of the maleic anhydride homopolymer comprises 2 or 3 maleic anhydride repeating units and the hydrolysate of the maleic acid homopolymer comprises 2 or 3 maleic anhydride repeating units.

15 . The method of claim 1 , wherein the corrosion inhibitor comprises a polymer comprising acrylic acid, t-butyl acrylamide, itaconic acid, and 2-acrylamido-2-methylpropane sulfonic acid.

16 . (canceled)

Assignees

• Ecolab Usa Inc

Inventors

• Gill Jasbir S
• Reed Peter E
• Banerjee Santanu
• Harbindu Anand
• Tong Yinyin

Classifications

• C09K15/06 Primary

  containing oxygen · CPC title

• C08F122/06

  Maleic anhydride · CPC title

• C23F11/124

  Carboxylic acids · CPC title

• C08F122/02 Primary

  Acids; Metal salts or ammonium salts thereof {, e.g. maleic acid or itaconic acid} · CPC title

• C08F4/40

  Redox systems · CPC title