US4017276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deoxygenation of water
Assignee: Lummus Technology LLC
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Filing: 1976-06-22
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Granted: 1977-04-12
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Expires: 1996-06-22
Abstract
Abstract Seawater is deoxygenated with a nitrogen stripping gas, with the nitrogen stripping gas containing stripped oxygen, being subjected to low temperature fractionation to separate oxygen from the nitrogen. The nitrogen recovered from the fractionation is then recycled to the stripping operation. Air is also employed as feed to the fractionation to provide additional nitrogen and reflux requirements.
Inventors
- 👤 Bert Bloem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:15
CPC Classifications
B; B01; B01D; B01D19/00; B01D19/0005; C; C02; C02F; C02F1/00; C02F1/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
49 words
A process for deoxygenating water, comprising: stripping oxygen from the water, said stripping being effected with a nitrogen stripping gas; recovering oxygen containing nitrogen stripping gas from said stripping; fractionating the oxygen containing nitrogen stripping gas to recover nitrogen; and employing recovered nitrogen as stripping gas for said stripping.
Claim 2
Dependent Claim
49 words
A process for deoxygenating water, comprising: stripping oxygen from the water, said stripping being effected with a nitrogen stripping gas; recovering oxygen containing nitrogen stripping gas from said stripping; fractionating the oxygen containing nitrogen stripping gas to recover nitrogen; and employing recovered nitrogen as stripping gas for said stripping.
Claim 3
Dependent Claim
10 words
The process of claim 1 wherein the water is seawater.
Claim 4
Dependent Claim
38 words
The process of claim 2 wherein said stripping is effected at a temperature of from about 275° K to about 330° K and a pressure of from about 0.8 kg/cm 2 a to about 1.3 kg/cm 2 a.
Claim 5
Dependent Claim
25 words
The process of claim 3 wherein the oxygen containing nitrogen stripping gas is combined with air and the combined stream is subjected to said fractionating.
Claim 6
Dependent Claim
28 words
The process of claim 4 wherein an oxygen enriched stream is recovered from said fractionating, said oxygen enriched stream being employed to provide cooling requirements for said fractionation.
Claim 7
Dependent Claim
18 words
The process of claim 5 wherein the nitrogen stripping gas contains no more than 0.5 volume percent oxygen.
Claim 8
Dependent Claim
32 words
The process of claim 6 wherein the seawater prior to stripping contains from about 7.5 to 12 ppm of oxygen and subsequent to stripping contains no more than about 0.5 ppm oxygen.
Claim 9
Dependent Claim
32 words
The process of claim 7 wherein the combined oxygen containing nitrogen stripping gas and air stream is employed to provide heat requirements for the fractionation prior to being subjected to the fractionation.
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) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |