US4089938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering oxygen from air
Assignee: Hudson Engineering Corp
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Filing: 1977-07-15
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Granted: 1978-05-16
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Expires: 1997-07-15
Abstract
Abstract A process is provided for recovering oxygen from air and particularly providing a product stream comprising a mixture of oxygen and steam useful, for example, in coal gasification processes. The instant process involves contacting a suspension of manganese dioxide in an aqueous solution of sodium or potassium hydroxide with air in a low pressure absorbing zone. The resulting liquid oxygen enriched stream is then pumped into a relatively high pressure generating zone where it is contacted with steam to release oxygen absorbed in the absorbing zone and thereby provide the above mentioned product.
Inventors
- 👤 Nelson C. Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:09
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/02; C01B13/08; C01B13/086
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
152 words
A process for producing a mixture consisting essentially of oxygen and steam comprising the steps of: contacting in an absorbing zone, a suspension of manganese dioxide in an aqueous solution of sodium or potassium hydroxide with air at a pressure not substantially exceeding atmospheric and at a temperature within the range of 400° to 550° F to provide an oxygen enriched stream; pumping said oxygen enriched stream into a generating zone maintained at a pressure within the range of 150 to 1035 psig and at a temperature within the range of 350° to 550° F, contacting said oxygen enriched stream while in said generating zone with steam to provide an oxygen depleted stream, said steam being sufficiently superheated to avoid substantially any condensation thereof in said generating zone; flowing said oxygen depleted stream back into said absorbing zone, and flowing a stream consisting essentially of oxygen and steam from said generating zone.
Claim 2
Dependent Claim
152 words
A process for producing a mixture consisting essentially of oxygen and steam comprising the steps of: contacting in an absorbing zone, a suspension of manganese dioxide in an aqueous solution of sodium or potassium hydroxide with air at a pressure not substantially exceeding atmospheric and at a temperature within the range of 400° to 550° F to provide an oxygen enriched stream; pumping said oxygen enriched stream into a generating zone maintained at a pressure within the range of 150 to 1035 psig and at a temperature within the range of 350° to 550° F, contacting said oxygen enriched stream while in said generating zone with steam to provide an oxygen depleted stream, said steam being sufficiently superheated to avoid substantially any condensation thereof in said generating zone; flowing said oxygen depleted stream back into said absorbing zone, and flowing a stream consisting essentially of oxygen and steam from said generating zone.
Claim 3
Dependent Claim
29 words
The process of claim 1, wherein said sodium or potassium hydroxide is present in said aqueous solution in an amount within the range of 60 to 95 weight percent.
Claim 4
Dependent Claim
21 words
The process of claim 2, wherein the temperature in the absorbing zone is within the range of 450° to 500° F.
Claim 5
Dependent Claim
21 words
The process of claim 3, wherein the pressure in the generating zone is within the range of 300 to 600 psig.
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) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |