# US 9,752,083 B2 · Method of scavenging hydrogen sulfide and/or sulfhydryl compounds

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- Number: US 9,752,083 B2
- Document ID: US9752083B2
- Status: Granted
- Kind: B2
- Application number: 13/970,082
- Filed: 2013-08-19
- Published: 2014-02-27
- Granted: 2017-09-05
- Earliest claimed: 2012-08-21
- Assignees: Lonza Ltd.
- Applicants: Lonza, Inc.
- Inventors: Kevin Edward Janak
- Web page: https://patentgrep.com/patent/US9752083B2

## CPC

- C10G 29/24: Aldehydes or ketones
- C09K 8/532: Sulfur
- C10G 29/20: Organic compounds not containing metal atoms
- C09K 2208/20: Hydrogen sulfide elimination
- C10G: CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION (cracking to hydrogen or synthesis gas C01B; cracking or pyrolysis of hydrocarbon gases to individual hydrocarbons or mixtures thereof of definite or specified constitution C07C; cracking to cokes C10B); RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

A method of reducing the amount of sulfhydryl compounds from sour hydrocarbon fluids is described. In the method, an aldehyde-releasing compound, which is high temperature stable and is highly water-soluble, is introduced to a hydrocarbon fluid stream as a scavenger for sulfhydryl compounds. The aldehyde-releasing compound is allowed to mix with the hydrocarbon fluid stream and the aldehyde-releasing compound is allowed to react with the sulfhydryl compounds present in the hydrocarbon fluid stream, thereby reducing the presence sulfhydryl compound in the hydrocarbon fluid stream.

## Claims

### Claim 1

A method for reducing the amount of sulfhydryl compounds from an oil and gas production well or injection well, said method comprising
(i) providing a high temperature stable, highly water soluble aldehyde-releasing compound comprising hydantoins; and
(ii) adding an effective amount of the aldehyde-releasing compound to the production well or the injection well at a position downhole and below ground surface, the aldehyde-releasing compound being added to a hydrocarbon fluid stream downhole and below ground during production of oil or gas from the production well or injection well.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the downhole addition, below ground surface, is achieved using a capillary string, umbilical cord, a perforation in the annulus of a production pipe, addition at the backside of the production or injection well.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the hydantoin comprises a hydroxymethyl hydantoin, a bis(hydroxymethyl)hydantoin or a mixture thereof.

### Claim 4 (depends on 3)

The method according to claim 3, wherein the hydroxymethylhydantion is selected from the group consisting of 1-hydroxymethyl-5,5-dimethylhydantoin, 3-hydroxymethyl-5,5-dimethylhydantoin, and mixtures thereof; and the bis(hydroxymethyl)hydantoin is 1,3 -bis(hydroxymethyl)-5 ,5 -dimethylhydantoin.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the sulfhydryl compound present in the hydrocarbon fluid comprises hydrogen sulfide.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the aldehyde-releasing compound is continuously fed, below ground surface, to the production well or injection well.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the aldehyde-releasing compound is fed, below ground surface, to the production well or injection well in a batchwise manner.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the aldehyde-releasing compound is added in amount of at least 0.3 moles of the aldehyde-releasing compound per mole of the sulfhydryl present in the hydrocarbon fluid stream to be treated.

### Claim 9 (depends on 8)

The method according to claim 8, wherein the aldehyde-releasing compound is added in amount between about 1 to about 10 moles of the aldehyde-releasing compound per mole of the sulfhydryl present in the hydrocarbon fluid stream to be treated.

### Claim 10 (depends on 1)

The method according to claim 1, wherein the aldehyde-releasing compound is stable at a temperature of 80° C. for a period of at least 6 hours.