US4731102A
Expired / Lapsed
US
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Oxygen gas production apparatus
Assignee: Air Water Inc
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Filing: 1986-08-08
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Granted: 1988-03-15
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Expires: 2006-08-08
Abstract
Abstract The invention provides an apparatus for production of highly pure oxygen gas by cryogenic liquefaction and separation of air which does not include an expansion turbine which is known to frequently cause operation troubles. The apparatus comprises an oxygen gas production apparatus comprising an air compression means for compressing air from an outside source, a purification means for removing carbon dioxide gas and water vapor from the air compressed by said air compression means, a heat exchange means for chilling the compressed air from said purification means to a cryogenic temperature, a fractionation column for liquefying and fractionating the compressed air chilled to a cryogenic temperature by said heat exchange means and holding nitrogen in gaseous state and oxygen in liquid state, a liquid oxygen storage means for receiving liquid oxygen from an outside source and storing the same, a line for continuously introducing into said fractionation column the liquid oxygen from said liquid oxygen storage means in lieu of the generated refrigeration from a cold heat generating expansion means, an oxygen gas withdrawal line for guiding the liquid oxygen within said fractionation column as a refrigerant to said heat exchange means and withdrawing the gasified oxygen produced by heat exchange as a product oxygen gas, and a pressurizing means for pressurizing the product oxygen gas withdrawn from said oxygen withdrawal line.
Inventors
- 👤 Akira Yoshino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:22
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04151; F25J3/04163; F25J3/04169; F25J3/04181; F25J3/04006; F25J3/04012; F25J3/04018; F25J3/04078; F25J3/0409; F25J3/04157; F25J3/04187; F25J3/04193; F25J3/04206; F25J3/04212; F25J3/04218; F25J3/04248; F25J3/04254; F25J3/04406; F25J3/04412; F25J3/04636; F25J3/04763; F25J3/04769; F25J3/04854; F25J3/0486; F25J3/04866; F25J2200/00; F25J2200/04; F25J2200/06; F25J2205/00; F25J2205/30; F25J2205/32; F25J2205/34; F25J2205/60; F25J2205/66; F25J2205/70; F25J2210/00; F25J2210/50; F25J2230/00; F25J2230/04; F25J2235/00; F25J2235/50; F25J2250/00; F25J2250/30; F25J2250/40; F25J2250/50; Y; Y10; Y10S; Y10S62/00; Y10S62/912; Y10S62/913
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
195 words
An oxygen gas production apparatus comprising an air compression means for compressing air from an outside source, a purification means for removing carbon dioxide gas and water vapor from the air compressed by said air compression means, a heat exchange means for chilling the compressed air from said purification means to a cryogenic temperature, a fractionation column for liquefying and fractionating the compressed air chilled to a cryogenic temperature by said heat exchange means and holding nitrogen in gaseous state and oxygen in liquid state, a liquid oxygen storage means for receiving liquid oxygen from an outside source and storing the same, a line for continuously introducing into said fractionation column the liquid oxygen from said liquid oxygen storage means for use as a refrigerant for liquefaction of compressed air in lieu of the generated refrigeration from a cold heat generating expansion means, an oxygen gas withdrawal line for guiding the liquid oxygen within said fractionation column as a refrigerant to said heat exchange means and withdrawing the gasified oxygen produced by heat exchange as a product oxygen gas, and a pressurizing means for pressurizing the product oxygen gas withdrawn from said oxygen withdrawal line.
Claim 2
Dependent Claim
195 words
An oxygen gas production apparatus comprising an air compression means for compressing air from an outside source, a purification means for removing carbon dioxide gas and water vapor from the air compressed by said air compression means, a heat exchange means for chilling the compressed air from said purification means to a cryogenic temperature, a fractionation column for liquefying and fractionating the compressed air chilled to a cryogenic temperature by said heat exchange means and holding nitrogen in gaseous state and oxygen in liquid state, a liquid oxygen storage means for receiving liquid oxygen from an outside source and storing the same, a line for continuously introducing into said fractionation column the liquid oxygen from said liquid oxygen storage means for use as a refrigerant for liquefaction of compressed air in lieu of the generated refrigeration from a cold heat generating expansion means, an oxygen gas withdrawal line for guiding the liquid oxygen within said fractionation column as a refrigerant to said heat exchange means and withdrawing the gasified oxygen produced by heat exchange as a product oxygen gas, and a pressurizing means for pressurizing the product oxygen gas withdrawn from said oxygen withdrawal line.
Claim 3
Dependent Claim
208 words
An oxygen gas production apparatus comprising an air compression means for compressing air from an outside source, a purification means for removing carbon dioxide gas and water vapor from the air compressed by said air compression means, a heat exchange means for chilling the compressed air from said purification means to a cryogenic temperature, a fractionation column for liquefying and fractionating the compressed air chilled to a cryogenic temperature by said heat exchange means and holding nitrogen in gaseous state and oxygen in liquid state, a liquid oxygen storage means for receiving liquid oxygen from an outside source and storing the same, a line for continuously introducing into said fractionation column the liquid oxygen from said liquid oxygen storage means for use as a refrigerant for liquefaction of compressed air in lieu of the generated refrigeration from a cold heat generating expansion means, a liquid oxygen withdrawal line for withdrawing liquid oxygen from said fractionation column, a pressurizing means for pressurizing the liquid oxygen from said liquid oxygen withdrawal line, and an oxygen gas withdrawal line for guiding the liquid oxygen pressurized by said pressurizing means to said heat exchange means as a refrigerant and withdrawing the gasified oxygen produced by heat exchange as a product oxygen gas.
Claim 4
Dependent Claim
208 words
An oxygen gas production apparatus comprising an air compression means for compressing air from an outside source, a purification means for removing carbon dioxide gas and water vapor from the air compressed by said air compression means, a heat exchange means for chilling the compressed air from said purification means to a cryogenic temperature, a fractionation column for liquefying and fractionating the compressed air chilled to a cryogenic temperature by said heat exchange means and holding nitrogen in gaseous state and oxygen in liquid state, a liquid oxygen storage means for receiving liquid oxygen from an outside source and storing the same, a line for continuously introducing into said fractionation column the liquid oxygen from said liquid oxygen storage means for use as a refrigerant for liquefaction of compressed air in lieu of the generated refrigeration from a cold heat generating expansion means, a liquid oxygen withdrawal line for withdrawing liquid oxygen from said fractionation column, a pressurizing means for pressurizing the liquid oxygen from said liquid oxygen withdrawal line, and an oxygen gas withdrawal line for guiding the liquid oxygen pressurized by said pressurizing means to said heat exchange means as a refrigerant and withdrawing the gasified oxygen produced by heat exchange as a product oxygen gas.
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) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |