# US 8,465,640 B2 · Method for inhibiting fouling in vapor transport system

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- Number: US 8,465,640 B2
- Document ID: US8465640B2
- Status: Granted
- Kind: B2
- Application number: 13/169,572
- Filed: 2011-06-27
- Published: 2012-01-19
- Granted: 2013-06-18
- Earliest claimed: 2010-07-13
- Assignees: Baker Hughes Incorporated
- Applicants: Roger D. Metzler; Zhenning Gu; Bradley Harrell
- Inventors: Roger D. Metzler; Zhenning Gu; Bradley Harrell
- Web page: https://patentgrep.com/patent/US8465640B2

## CPC

- C23F 11/00: Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent (adding inhibitors to mineral oil, fuels, or lubricants C10; adding inhibitors to pickling solutions C23G)
- C01B 7/0706: {of hydrogen chloride}
- C23F 11/02: in air or gases by adding vapour phase inhibitors
- C23F 11/04: in markedly acid liquids
- F28F 19/00: Preventing the formation of deposits or corrosion, e.g. by using filters {or scrapers}
- 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
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)

## Abstract

Elimination and/or mitigation of fouling in a vapor transport systems, such as vent lines and scrubber feed lines may be accomplished using an antifouling additive. The method for employing the antifouling additive includes introducing into the vapor transport system an additive including a polar solvent and corrosion inhibitor wherein: the vapor transport system is substantially water free; the vapor transport system is used to transport acidic materials; the additive is a liquid at vapor transport system operating conditions; and the additive is stable at the vapor transport system operating conditions.

## Claims

### Claim 1

A method for the prevention or mitigation of fouling in vapor transport systems comprising introducing into the vapor transport system an additive comprising a polar solvent and corrosion inhibitor wherein:
the vapor transport system is substantially water free;
the vapor transport system is used to transport at least one acidic material;
the additive is a liquid at vapor transport system operating conditions; and
the additive is stable at the vapor transport system operating conditions;
wherein the polar solvent is: an aliphatic amide selected from the group consisting of N, N-dimethylacrylamide, N-isopropylacrvlamide, N-methacrvlamide, N,N-diethylacrylamide, and combinations thereof; or the polar solvent is N-methyl-2-pyrrolidone.

### Claim 2

A method for the prevention or mitigation of fouling in vapor transport systems comprising introducing into the vapor transport system an additive comprising a polar solvent and corrosion inhibitor wherein:
the vapor transport system is substantially water free;
the vapor transport system is used to transport at least one acidic material;
the additive is a liquid at vapor transport system operating conditions; and
the additive is stable at the vapor transport system operating conditions wherein the corrosion inhibitor is a quaternary amine selected from the group consisting of quaternized alkylpyridines, quaternized fatty amines, and combinations thereof.

### Claim 3 (depends on 1)

The method of claim 1 wherein the at least one acidic material is also a source of fouling.

### Claim 4 (depends on 1)

The method of claim 1 wherein the additive is introduced into the vapor transport system continuously.

### Claim 5 (depends on 4)

The method of claim 4 wherein the continuous introduction of the additive functions to prevent or mitigate deposition of fouling deposits.

### Claim 6 (depends on 1)

The method of claim 1 wherein the additive is introduced into the vapor transport system intermittently.

### Claim 7 (depends on 6)

The method of claim 6 wherein the intermittent introduction of the additive functions to at least partially remove existing fouling deposits.