# US 10,246,629 B2 · Mitigation of corrosion in geothermal systems

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,246,629 B2
- Document ID: US10246629B2
- Status: Granted
- Kind: B2
- Application number: 15/602,484
- Filed: 2017-05-23
- Published: 2017-09-14
- Granted: 2019-04-02
- Earliest claimed: 2014-12-30
- Assignees: Ecolab USA Inc.
- Applicants: Ecolab USA Inc.
- Inventors: Jasbir S. Gill
- Web page: https://patentgrep.com/patent/US10246629B2

## CPC

- C09K 8/54: Compositions for in situ inhibition of corrosion in boreholes or wells
- C23F 11/10: using organic inhibitors
- C23F 11/12: Oxygen-containing compounds
- C23F 11/122: {Alcohols; Aldehydes; Ketones}
- C23F 11/141: {Amines; Quaternary ammonium compounds}
- C23F 11/145: {Amides; N-substituted amides}
- C09K 2208/32: Anticorrosion additives
- Y02E 10/10: Geothermal energy
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C23F: NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE (working metal by laser beams B23K26/00; desurfacing by applying flames B23K7/00; working of metal by electro-erosion B23H; producing decorative effects by removing surface material, e.g. by engraving, by etching, B44C1/22; electrolytic etching or polishing C25F); INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Corrosion inhibitor blends including one or more ether compounds, one or more quaternary ammonium compounds, and one or more fatty acid amine condensates are disclosed. The corrosion inhibitor blends can be used in methods of inhibiting corrosion of a metallic surface in a geothermal process. In one method, an effective amount of a corrosion inhibitor blend may be added to a production well in a geothermal process. In another method, an effective amount of a corrosion inhibitor blend may be added to a geothermal medium, which could be, for example, steam or liquid brine.

## Claims

### Claim 1

A corrosion inhibitor blend comprising an ether compound, a quaternary ammonium compound, and a fatty acid amine condensate, wherein the quaternary ammonium compound is selected from the group consisting of benzyldimethyldodecylammonium chloride, benzyldimethylhexadecylam monium chloride, benzyldimethyloctadecyl ammonium chloride, and any combination thereof.

### Claim 2 (depends on 1)

The corrosion inhibitor blend of claim 1, wherein the ether compound is selected from the group consisting of butoxyethanol, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, and any combination thereof.

### Claim 3 (depends on 1)

The corrosion inhibitor blend of claim 1, wherein the fatty acid amine condensate is prepared by reacting an amine with a fatty acid comprising a carboxylic acid and a hydrocarbon chain comprising about 10 to about 30 carbon atoms.

### Claim 4 (depends on 3)

The corrosion inhibitor blend of claim 3, wherein the fatty acid is selected from the group consisting of tall oil fatty acid, lauric acid, stearic acid, phosphate esters, propenoic acid, oleic acid, and any combination thereof.

### Claim 5 (depends on 3)

The corrosion inhibitor blend of claim 3, wherein the amine is aminoethyl-1,2-ethanediamine.

### Claim 6 (depends on 1)

The corrosion inhibitor blend of claim 1, wherein the ether compound comprises an alcohol functional group.

### Claim 7 (depends on 1)

The corrosion inhibitor blend of claim 1, wherein the corrosion inhibitor blend comprises about 10% to about 30%, by weight, of the ether compound.

### Claim 8 (depends on 1)

The corrosion inhibitor blend of claim 1, wherein the corrosion inhibitor blend comprises about 50% to about 60%, by weight, of the quaternary ammonium compound.

### Claim 9 (depends on 1)

The corrosion inhibitor blend of claim 1, wherein the corrosion inhibitor blend comprises about 10% to about 20%, by weight, of the fatty acid amine condensate.

### Claim 10

A corrosion inhibitor blend comprising an ether compound, quaternary ammonium compounds, and a fatty acid amine condensate, wherein the quaternary ammonium compounds are a combination of at least two quaternary ammonium compounds selected from the group consisting of benzyldimethyldodecylammonium chloride, benzyldimethyltetradecylammonium chloride, benzyldimethylhexadecylam monium chloride, and benzyldimethyloctadecyl ammonium chloride.

### Claim 11 (depends on 10)

The corrosion inhibitor blend of claim 10, wherein the quaternary ammonium compounds are a combination of at least three quaternary ammonium compounds selected from the group consisting of benzyldimethyldodecylammonium chloride, benzyldimethyltetradecylammonium chloride, benzyldimethylhexadecylam monium chloride, and benzyldimethyloctadecyl ammonium chloride.

### Claim 12 (depends on 10)

The corrosion inhibitor blend of claim 10, wherein the ether compound is selected from the group consisting of butoxyethanol, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, and any combination thereof.

### Claim 13 (depends on 10)

The corrosion inhibitor blend of claim 10, wherein the fatty acid amine condensate is prepared by reacting an amine with a fatty acid comprising a carboxylic acid and a hydrocarbon chain comprising about 10 to about 30 carbon atoms.

### Claim 14 (depends on 13)

The corrosion inhibitor blend of claim 13, wherein the fatty acid is selected from the group consisting of tall oil fatty acid, lauric acid, stearic acid, phosphate esters, propenoic acid, oleic acid, and any combination thereof.