US3909409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery system for oxygen from waste water oxygenation
Assignee: Chicago Bridge and Iron Co
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Filing: 1974-06-12
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Granted: 1975-09-30
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Expires: 1994-06-12
Abstract
Abstract The method of introducing substantially pure gaseous oxygen through waste water, having a high biochemical oxygen demand (BOD), in an enclosed receptacle, separating an effluent stream of gas containing oxygen mixed with nitrogen, carbon dioxide, water vapor, and other gases present in trace quantities, from the oxygenated waste water, feeding the effluent stream of gas into a pool of liquid oxygen in an enclosed receptacle and thereby solidifying carbon dioxide and water vapor, separating a stream of gas containing oxygen, nitrogen, and other gases present in trace quantities, from the liquid oxygen, cooling the gas stream to a temperature low enough to condense the oxygen, but not the nitrogen, in the said gas stream, returning the liquefied oxygen to the pool of liquid oxygen and venting the remaining gas to a disposal means, and vaporizing liquid oxygen from the pool and delivering the pure oxygen gas to the waste water in the enclosed receptacle.
Inventors
- 👤 Kenneth Wilson Lange
- 👤 James Bernard Maher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:14
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/1278; C02F3/1284; C02F3/26; F; F25; F25J; F25J3/00; F25J3/08; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
176 words
THE METHOD WHICH COMPRISES: INTRODUCING SUBSTANTIALLY PURE GASEOUS OXYGEN THROUGH WASTE WATER, HAVING A HIGH BIOCHEMICAL OXYGEN DEMAND (BOD), IN A FIRST ENCLOSED RECEPTACLE, SEPARATING AN EFFLENT STREAM OF GAS CONTAINING OXYGEN MIXED WITH NITROGEN, CARBON DIOXIDE, WATER VAPOR, AND OTHER GASES PRESENT IN TRACE QUANTITIES, FROM THE OXYGENATED WASTE WATER, FEEDING THE EFFLUENT STREAM OF GAS INTO A POOL OF LIQUID OCYGEN IN A SECOND ENCLOSED RECEPTACLE AND THEREBY SOLIDIFYING THE CARBON DIOXIDE AND CONVERING THE WATER VAPOR TO ICE, SEPARATING A GAS STREAM CONTAINING OXYGEN, NITROGEN, AND OTHHER GASES PRESENT IN TRACE QUANTITIES, FROM THE LIQUID OXYGEN, COOLING THE GAS STREAM FROM THE LIQUID OXYGEN TO A TEMPERATURE LOW ENOUGH TO CONDENSE THE OXYGEN, BUT NOT THE NITROGEN, IN THE SAID GAS STREAM, SEPARATING THE CONDENSED AND LIQUEFIED OXYGEN FROM THE NITROGEN GAS, RETURNING THE LIQUIDFIED OYGEN TO THE POOL OF LIQUID OXYGEN, AND VENTING THE REMAINING GAS TO A DISPOSAL MEANS, AND VAPORIZING LIQUID OXYGEN FROM THE POOL AND DELIVERING THE PURE OXYGEN GAS TO THE WASTE WATER IN THE FIRST ENCLOSED RECEPTACLE.
Claim 2
Independent Claim
176 words
THE METHOD WHICH COMPRISES: INTRODUCING SUBSTANTIALLY PURE GASEOUS OXYGEN THROUGH WASTE WATER, HAVING A HIGH BIOCHEMICAL OXYGEN DEMAND (BOD), IN A FIRST ENCLOSED RECEPTACLE, SEPARATING AN EFFLENT STREAM OF GAS CONTAINING OXYGEN MIXED WITH NITROGEN, CARBON DIOXIDE, WATER VAPOR, AND OTHER GASES PRESENT IN TRACE QUANTITIES, FROM THE OXYGENATED WASTE WATER, FEEDING THE EFFLUENT STREAM OF GAS INTO A POOL OF LIQUID OCYGEN IN A SECOND ENCLOSED RECEPTACLE AND THEREBY SOLIDIFYING THE CARBON DIOXIDE AND CONVERING THE WATER VAPOR TO ICE, SEPARATING A GAS STREAM CONTAINING OXYGEN, NITROGEN, AND OTHHER GASES PRESENT IN TRACE QUANTITIES, FROM THE LIQUID OXYGEN, COOLING THE GAS STREAM FROM THE LIQUID OXYGEN TO A TEMPERATURE LOW ENOUGH TO CONDENSE THE OXYGEN, BUT NOT THE NITROGEN, IN THE SAID GAS STREAM, SEPARATING THE CONDENSED AND LIQUEFIED OXYGEN FROM THE NITROGEN GAS, RETURNING THE LIQUIDFIED OYGEN TO THE POOL OF LIQUID OXYGEN, AND VENTING THE REMAINING GAS TO A DISPOSAL MEANS, AND VAPORIZING LIQUID OXYGEN FROM THE POOL AND DELIVERING THE PURE OXYGEN GAS TO THE WASTE WATER IN THE FIRST ENCLOSED RECEPTACLE.
Claim 3
Dependent Claim
23 words
The method of claim 1 in which the solid carbon dioxide and ice are removed from the liquid oxygen pool at least periodically.
Claim 4
Dependent Claim
21 words
The method of claim 1 in which the waste water is under a pressure of at least 30 psig when oxygenated.
Claim 5
Dependent Claim
54 words
The method of claim 1 in which the stream of gas containing oxygen and nitrogen from the liquid oxygen is cooled by passing it in direct or indirect heat exchange with a stream of cold oxygen from the liquid oxygen pool and the cold oxygen is then warmed and introduced into the waste water.
Claim 6
Dependent Claim
19 words
The method of claim 4 in which the stream of cold oxygen fed in indirect heat exchange is liquid.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |