# US 8,771,594 B2 · Inhibition of corrosion in boiler systems with etheramines

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- Number: US 8,771,594 B2
- Document ID: US8771594B2
- Status: Granted
- Kind: B2
- Application number: 13/471,797
- Filed: 2012-05-15
- Published: 2013-11-21
- Granted: 2014-07-08
- Earliest claimed: 2012-05-15
- Assignees: ExxonMobil Research and Engineering Company
- Applicants: Michael Siskin; Robert B. Fedich; Michel A. Daage
- Inventors: Michael Siskin; Robert B. Fedich; Michel A. Daage
- Web page: https://patentgrep.com/patent/US8771594B2

## CPC

- C23F 11/146: {containing a multiple nitrogen-to-carbon bond}
- C23F 11/141: {Amines; Quaternary ammonium compounds}
- F22B 1/00: Methods of steam generation characterised by form of heating method
- F22B 37/025: {Devices and methods for diminishing corrosion, e.g. by preventing cooling beneath the dew point}
- 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
- F22B: METHODS OF STEAM GENERATION; STEAM BOILERS

## Abstract

Aminoethers are used as corrosion inhibitors in boiler systems in which a working fluid comprising water with an aminoether corrosion inhibitor is circulated from a heater to a utilization site at which the working fluid gives up energy and decreases in temperature. A preferred class of aminoethers are the alkoxytriethyleneglycol-tert-alkylamines such as methoxy triethyleneglycol-tert-butylamine.

## Claims

### Claim 1

A closed loop boiler system having a circuit in which a working fluid comprising water and an aminoether corrosion inhibitor is circulated from a heater to a utilization site comprising a radiator and/or a heat exchanger at which the working fluid gives up energy and decreases in temperature in which the aminoether corrosion inhibitor comprises a diamino ether and an aminoether alcohol represented by the respective formulae:
where x is an integer ranging from 2 to 6.

### Claim 2 (depends on 1)

A system according to claim 1 which is a single phase, closed loop system in which the water is heated in the heater and circulated to the utilization site.

### Claim 3 (depends on 1)

A system according to claim 1 which is a closed loop system having a circuit in which the water is converted to steam in the heater and condensed to water at at least one condensation site comprising a radiator and/or a heat exchanger in the circuit.

### Claim 4 (depends on 1)

A system according to claim 1 in which the aminoether corrosion inhibitor comprises the diamino ether and aminoalcohol where the weight ratio of the diamino ether to the aminoalcohol ranges from 0.23:1 to 2.3:1.

### Claim 5 (depends on 1)

A system according to claim 1 in which the aminoether corrosion inhibitor comprises a mixture of bis-(tert-butylaminoethoxy) ethane and tert-butylaminoethoxyethoxyethanol.

### Claim 6 (depends on 1)

A system according to claim 1 in which the steam temperature is up to about 250° C.