Patent US4515759A successfully refreshed from Google Patents.
US4515759A
Expired / Lapsed
US
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Process of removing hydrogen sulfide from gas mixtures
Assignee: Nalco Energy Services LP
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Filing: 1983-11-03
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Granted: 1985-05-07
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Expires: 2003-11-03
Abstract
Abstract Process for the removal of hydrogen sulfide from gas mixtures, particular gas mixtures containing hydrocarbons, wherein the gas mixture is treated with an aqueous solution of a water soluble nitrite such as sodium nitrite, the pH of the aqueous solution being at least 5.5 or greater.
Inventors
- 👤 Edward E. Burnes
- 👤 Kishan Bhatia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:43
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/14; B01D53/1493; B01D53/1456; B01D53/1468; C; C07; C07C; C07C7/00; C07C7/148; C07C7/14833; C07C7/1485
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
38 words
A process for removing hydrogen sulfide from a gas mixture comprising treating said gas mixture with an aqueous medium containing an effective amount of a inorganic water soluble metal nitrite at a pH of about 5.5 or greater.
Claim 2
Dependent Claim
38 words
A process for removing hydrogen sulfide from a gas mixture comprising treating said gas mixture with an aqueous medium containing an effective amount of a inorganic water soluble metal nitrite at a pH of about 5.5 or greater.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein said gas mixture contains gaseous hydrocarbons.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein said gas mixture comprises natural gas.
Claim 5
Dependent Claim
33 words
The process of claim 1 wherein said water soluble nitrite, calculated as nitrite, is present in said aqueous medium in an amount of from about 0.1 percent by weight up to about saturation.
Claim 6
Dependent Claim
23 words
The process of claim 1 wherein said water soluble nitrite is selected from the class consisting of alkali metal an alkaline earth-metal nitrites.
Claim 7
Dependent Claim
13 words
The process of claim 5 wherein said water soluble nitrite comprises sodium nitrite.
Claim 8
Dependent Claim
25 words
The process of claim 1 wherein said aqueous solution is buffered to provide a pH in the range of from about 6 to about 10.
Claim 9
Dependent Claim
30 words
The process of claim 6 wherein a buffering agent selected from the class consisting of borates, phosphates, phthalates, bicarbonates, ammonium chloride, and mixtures thereof is present in said aqueous medium.
Claim 10
Dependent Claim
23 words
The process of claim 1 wherein said treating comprises scrubbing said gas mixture by passing said gas mixture upwardly through said aqueous medium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-06 | 1988-11-05 | 1989-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-06 | 1992-11-05 | 1993-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-06 | 1996-11-05 | 1997-05-07 | $7700.00 | Window Closed / Lapsed |