US4789488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyzed oxygen removal with hydrogen for steam generator systems
Assignee: Westinghouse Electric Co LLC
•
Filing: 1987-08-21
•
Granted: 1988-12-06
•
Expires: 2007-08-21
Abstract
Abstract Water for use in steam generation systems, which is contained in a storage tank, is deoxygenated for use in the system by adding hydrogen to a stream of the water and intimately mixing the same, pressurizing the stream to a pressure of 60-150 psig, and contacting the pressurized stream with a catalyst bed of palladium or platinum dispersed on a solid carrier. The hydrogen reacts with the dissolved oxygen in the presence of the catalyst at ambient temperatures, to produce a deoxygenated stream of water containing less than 10 ppb of oxygen. The deoxygenated water can be returned to the storage tank or supplied directly to the steam generation system.
Inventors
- 👤 Sunil G. DeSilva
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:15
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/02; B01J31/06; B01J31/08; B01D; B01D19/00; B01D19/0005; C; C02; C02F; C02F1/00; C02F1/20; C02F1/72; C02F1/725; C23; C23F; C23F11/00; C23F11/08; C23F11/18
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
137 words
A method for removing dissolved oxygen from a supply of aqueous medium comprising: discharging a stream of aqueous medium containing dissolved oxygen from said supply thereof; injecting hydrogen gas into said discharged stream of aqueous medium; intimately mixing said hydrogen with said aqueous medium; pressurizing the intimately mixed stream to a pressure of between 60-150 psig; and contacting said pressurized, intimately mixed stream, for a period of time of 0.5 to 2 minutes, at a temperature of between 15°-40° C., with an effective amount of a noble metal selected from the group consisting of palladium and platinum, dispersed on a stable carrier material, for a period of time effective to react the hydrogen and dissolved oxygen to produce a deoxygenated aqueous medium stream having a dissolved oxygen content of below about 2 parts per billion by weight.
Claim 2
Independent Claim
137 words
A method for removing dissolved oxygen from a supply of aqueous medium comprising: discharging a stream of aqueous medium containing dissolved oxygen from said supply thereof; injecting hydrogen gas into said discharged stream of aqueous medium; intimately mixing said hydrogen with said aqueous medium; pressurizing the intimately mixed stream to a pressure of between 60-150 psig; and contacting said pressurized, intimately mixed stream, for a period of time of 0.5 to 2 minutes, at a temperature of between 15°-40° C., with an effective amount of a noble metal selected from the group consisting of palladium and platinum, dispersed on a stable carrier material, for a period of time effective to react the hydrogen and dissolved oxygen to produce a deoxygenated aqueous medium stream having a dissolved oxygen content of below about 2 parts per billion by weight.
Claim 3
Dependent Claim
32 words
The method as defined in claim 1 wherein said supply of aqueous media is contained within a storage tank and wherein said deoxygenated aqueous media stream is returned to said storage tank.
Claim 4
Dependent Claim
19 words
The method as defined in claim 1 wherein said noble metal is dispersed on a polystyrene-based anion exchange resin.
Claim 5
Dependent Claim
26 words
The method as defined in claim 1 wherein said hydrogen and aqueous medium are intimately mixed by passage thereof through a column containing solid particulate matter.
Claim 6
Dependent Claim
15 words
The method as defined in claim 4 wherein said solid particulate matter comprises glass beads.
Claim 7
Dependent Claim
13 words
The method as defined in claim 1 wherein said noble metal is palladium.
Claim 8
Dependent Claim
13 words
The method as defined in claim 1 wherein said noble metal is platinum.
Claim 9
Dependent Claim
190 words
In a method for removing dissolved oxygen from a supply of aqueous medium contained in a storage tank, for use in a steam generation system through which the aqueous medium is to be circulated, wherein prior to introduction into the steam generation system, the dissolved oxygen content of said aqueous medium is reduced, the improvement comprising: discharging a stream of aqueous medium containing dissolved oxygen from said storage tank; injecting hydrogen gas into said discharged stream of aqueous medium; intimately mixing said hydrogen with said aqueous medium by passage thereof through a column containing solid particulate matter; pressurizing the intimately mixed stream to a pressure of between 60-150 psig; and contacting said pressurized, intimately mixed stream, for a period of time of 0.5 to 2 minutes, at a temperature of between 15°-40° C., with an effective amount of a noble metal selected from the group consisting of palladium and platinum, dispersed on a stable carrier material, for a period of time effective to react the hydrogen and dissolved oxygen to produce a deoxygenated aqueous medium stream having a dissolved oxygen content of below about 2 parts per billion by weight.
Claim 10
Dependent Claim
190 words
In a method for removing dissolved oxygen from a supply of aqueous medium contained in a storage tank, for use in a steam generation system through which the aqueous medium is to be circulated, wherein prior to introduction into the steam generation system, the dissolved oxygen content of said aqueous medium is reduced, the improvement comprising: discharging a stream of aqueous medium containing dissolved oxygen from said storage tank; injecting hydrogen gas into said discharged stream of aqueous medium; intimately mixing said hydrogen with said aqueous medium by passage thereof through a column containing solid particulate matter; pressurizing the intimately mixed stream to a pressure of between 60-150 psig; and contacting said pressurized, intimately mixed stream, for a period of time of 0.5 to 2 minutes, at a temperature of between 15°-40° C., with an effective amount of a noble metal selected from the group consisting of palladium and platinum, dispersed on a stable carrier material, for a period of time effective to react the hydrogen and dissolved oxygen to produce a deoxygenated aqueous medium stream having a dissolved oxygen content of below about 2 parts per billion by weight.
Claim 11
Dependent Claim
19 words
The method as defined in claim 8 wherein the solid particulate the matter in said column comprises glass beads.
Claim 12
Dependent Claim
19 words
The method as defined in claim 8 wherein said deoxygenated aqueous medium stream is returned to said storage tank.
Claim 13
Dependent Claim
20 words
The method as defined in claim 8 wherein said deoxygenated aqueous medium stream is introduced into said steam generation system.
Claim 14
Dependent Claim
19 words
The method as defined in claim 8 wherein said noble metal is dispersed on a polystyrene-based anion exchange resin.
Claim 15
Dependent Claim
13 words
The process as defined in claim 12 wherein said noble metal is palladium.
References Cited (Backward Citations)
US1531989A
Cited
US2155435A
Cited
US3296125A
Cited
US4009252A
Cited
US4129502A
Cited
US4278635A
Cited
US4278635B1
Cited
JPS5879590A
Cited
JPS58174285A
Cited
US4557835A
Cited
US4574071A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-06 | 1992-06-06 | 1992-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-06 | 1996-06-06 | 1996-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-06 | 2000-06-06 | 2000-12-06 | $7700.00 | Window Closed / Lapsed |