US4238463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for desulfurizing gases with iron oxide
Assignee: Chevron USA Inc
•
Filing: 1979-06-28
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Granted: 1980-12-09
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Expires: 1999-06-28
Abstract
Abstract Removal of hydrogen sulfide from gases using iron oxide-containing solids is improved by introducing a liquid containing a primary or secondary amine into the iron oxide-containing solids.
Inventors
- 👤 Stephen W. Nicksic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:53
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/14; B01D53/1493; B01D53/1456; B01D53/1475; C; C07; C07C; C07C7/00; C07C7/148; C07C7/14833; C07C7/14841; Y; Y02; Y02C; Y02C20/00; Y02C20/40; Y02P; Y02P20/00; Y02P20/151
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
109 words
In a method for removing hydrogen sulfide from a gas, wherein said gas is contacted with a bed of subdivided solids containing iron oxide, hydrogen sulfide is reacted with iron oxide to form iron sulfide; iron sulfide is reacted with molecular oxygen in said gas to form iron oxide and elemental sulfur; elemental sulfur is deposited in said bed; and said gas is recovered from said bed, the improvement comprising: introducing into said bed a liquid comprising an amine having the formula ##STR3## where R 1 and R 2 are selected from hydrocarbon radicals having from 1 to 10 carbon atoms, and where R 1 may be hydrogen ion.
Claim 2
Dependent Claim
109 words
In a method for removing hydrogen sulfide from a gas, wherein said gas is contacted with a bed of subdivided solids containing iron oxide, hydrogen sulfide is reacted with iron oxide to form iron sulfide; iron sulfide is reacted with molecular oxygen in said gas to form iron oxide and elemental sulfur; elemental sulfur is deposited in said bed; and said gas is recovered from said bed, the improvement comprising: introducing into said bed a liquid comprising an amine having the formula ##STR3## where R 1 and R 2 are selected from hydrocarbon radicals having from 1 to 10 carbon atoms, and where R 1 may be hydrogen ion.
Claim 3
Dependent Claim
20 words
An improved method according to claim 1 wherein said bed of solid comprises ferric oxide disposed on a cellulosic support.
Claim 4
Dependent Claim
41 words
An improved method according to claim 1 wherein a carbon atom in at least one of R 1 and R 2 is bonded to (a) the nitrogen atom of said amine, (b) two other carbon atoms, and (c) a hydrogen atom.
Claim 5
Dependent Claim
40 words
An improved method according to claim 1 wherein said gas includes at least one compound selected from a C 1 -C 4 paraffin, a C 1 -C 4 olefin, carbon dioxide, molecular nitrogen, molecular oxygen, molecular hydrogen and water vapor.
Claim 6
Dependent Claim
26 words
An improved method according to claim 1 wherein at least one of R 1 and R 2 is selected from 2-propyl, 2-n-butyl, 3-n-pentyl, 3-methyl-2-butyl and cyclohexyl.
Claim 7
Dependent Claim
15 words
An improved method according to claim 1 wherein said gas is a produced fuel gas.
Claim 8
Dependent Claim
17 words
An improved method according to claim 1 wherein said liquid comprises an aqueous solution of said amine.
Claim 9
Dependent Claim
18 words
An improved method according to claim 1 wherein said liquid comprises a solution of said amine in dimethylsulfoxide.
Claim 10
Dependent Claim
14 words
An improved method according to claim 1 wherein said amine is a secondary amine.
References Cited (Backward Citations)
US76544A
Cited
US2733979A
Cited
US1105578A
Cited
US1479852A
Cited
US1507105A
Cited
US3071433A
Cited
US3822341A
Cited
US4100257A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-09 | 1984-06-09 | 1984-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-09 | 1988-06-09 | 1988-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-09 | 1992-06-09 | 1992-12-09 | $7700.00 | Window Closed / Lapsed |