US2918802A - Process of separation of air into its elements - Google Patents

Process of separation of air into its elements Download PDF

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US2918802A
US2918802A US612441A US61244156A US2918802A US 2918802 A US2918802 A US 2918802A US 612441 A US612441 A US 612441A US 61244156 A US61244156 A US 61244156A US 2918802 A US2918802 A US 2918802A
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pressure
air
liquid
expansion
oxygen
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US612441A
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Jacques F Grunberg
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Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Air Liquide SA
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04151Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04187Cooling of the purified feed air by recuperative heat-exchange; Heat-exchange with product streams
    • F25J3/04218Parallel arrangement of the main heat exchange line in cores having different functions, e.g. in low pressure and high pressure cores
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04078Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
    • F25J3/0409Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression of oxygen
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/04309Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of nitrogen
    • F25J3/04315Lowest pressure or impure nitrogen, so-called waste nitrogen expansion
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04406Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system
    • F25J3/04412Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2200/00Processes or apparatus using separation by rectification
    • F25J2200/20Processes or apparatus using separation by rectification in an elevated pressure multiple column system wherein the lowest pressure column is at a pressure well above the minimum pressure needed to overcome pressure drop to reject the products to atmosphere
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2200/00Processes or apparatus using separation by rectification
    • F25J2200/50Processes or apparatus using separation by rectification using multiple (re-)boiler-condensers at different heights of the column
    • F25J2200/52Processes or apparatus using separation by rectification using multiple (re-)boiler-condensers at different heights of the column in the high pressure column of a double pressure main column system
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2205/00Processes or apparatus using other separation and/or other processing means
    • F25J2205/24Processes or apparatus using other separation and/or other processing means using regenerators, cold accumulators or reversible heat exchangers

Description

1386- 1959 J; F. GRUNBERG PROCESS OF SEPARATION OF AIR INTO ITS ELEMENTS Filed. Sept. 27, 1956 17zue/2ZZ/ JYCQUES FT GRUIVBFRG United States P n PROCESS OF SEPARATION OF AIR' INTO ITS ELEMENTS Jacques F. Grunberg, Outremont, Quebec, Canada, as-

signor to LAir Liquide, Societe Anonyme pour lEtude et l'Exploitation des Procedes Georges Claude, Paris, France, a body politic and corporate Application September 27, 1956, Serial No. 612,441

7 Claims. (CI. 62-25) section of the unit, or a part of the gaseous nitrogen.

obtained in the rectification high pressure column of a two-column rectification process.

It is characteristic of the present invention that the: low pressure stage used for the rectification is appre ciably higher than atmospheric pressure and that at least: one of the product gases delivered by the low pressure column is expanded, at least in part, with production of:'

external work.

As the flow of expanded gas can be important (for ex-- ample, the total amount of nitrogen product can be ex+' panded), the refrigeration produced is considerable, even for a relatively small expansion ratio, and it is possible: to produce all the refrigeration necessary for the operation of the unit in expanding nitrogen from a relatively lowpressure, for example, from 2 kg./cm. absolute pressure down to a pressure close to the atmospheric pres-- sure.

The expansion of the product gas can be carried out: in a turbine, this type of machine having a'high efficiency for low expansion ratios, and being particularly con-' venient when the actual volume of gases to be expanded. is relatively considerable. In the case of small units,. where generally reciprocating engines are used for the: expansion of high pressure air, the reciprocating engine: can be replaced by a turbine expanding low pressure nitrogen, as per the invention. The turbine will give greater running security, will be less cumbersome, and. cheaper than the conventional reciprocating expansion. engine.

It should be also noticed that, due to the low intake and discharge pressures of the turbine, smaller gas leaks will be experienced than on turbines running at higher" pressures.

The gas, which leaves the top of the low pressure column at a very low temperature, must first be reheated before expansion in order to increase the efliciency of' the expansion and avoid a partial liquefaction. In a preferred arrangement of the invention, the gas which must be expanded, is first reheated before expansion by heat transfer with a liquid leaving the high pressure column. The liquid is further expanded and delivered to a low pressure column.

Besides, the gas which is expanded in the turbine leavesit too cold to be sent directly to the heat exchanger sec-- tion destined to cool the air to be treated. In another type of arrangement of the present invenion, the expanded gas is reheated as above, by heat transfer with a liquid. leaving the high pressure column and sent to a low pressure column.

It is seen that for the reheating of the gas, before and" after expansion, the liquid coolers can be used. These liquid coolers are standard on these plants to reduce the: amount of liquid vaporized through the expansion. The" liquid coolers can be used as super heaters for the gas,. due to the relatively low temperature drop, which results from the expansion of the gas.

An interesting application of the present invention con-1- cerns the units where the separation of air produces'v gaseous oxygen under pressure through the vaporization.-

of liquid-oxygen compressed beforehand.

' It is well known that, in order to produce oxygenunder pressure, the compressed air to be separated is used both for the vaporization of the liquid-oxygen under pressure by heat transfer with the liquid-oxygen, and for the production of refrigeration through expansion with external work. Due to the fact that the vaporization of liquidperature of the oxygen, in order to obtain a good efiiciency oxygen under pressure requires a large amount of heat supplied at a relatively high temperature, it is necessary in the conventional processes to compress air at a pressure which is appreciably higher than that of the pro-' Y duced oxygen, so that the heat transfer can be carried out.

a If a part of the high pressure air has to be expanded with external work in the conventional processes, it is generally necessary to send it to the expansion engine at a temperature which is higher than the vaporization temof the expansion without partial liquefaction in the engine.

The total amount of air which remains available for the vaporization of the high pressure oxygen, is then reduced and the air pressure appreciably increased in order t compensate for the reduction of the output.

The present invention permits avoidance of the abovementioned inconveniences. Refrigeration is suppliedby expansion with external work of at least one of the product gases collected at one of the low pressures used for whereas the second fraction is sent after cooling at about its initial pressure to the rectification section of the plant.-

A non-limitative example has been described below and is illustrated in the attached drawing, which shows a unit made of two columns for the production of gaseous oxygen under pressure.

The atmospheric air to be separated is compressed in a blower 1 at an absolute pressure of about 8.5 kg./cm. and cooled in a water-cooler 2. It leaves the cooler at about 27 C. The air is then divided into two fractions. The first one (about 77.5% of the total of air treated) enters regenerator 4A through pipe 3 and loses its moisture and its carbon dioxide. The purified air leaves the regenerator at a temperature which is slightly higher than its dew point and, through pipe 6, enters the high pressure rectification column 18 at an absolute pressure of about 8.3 kg./cm. The second air fraction, about 22.5% of the total amount, is fed through pipe 7 to a compressor 8, where it is further compressed to a pressure high enough to allow the vaporization of the compressed liquid oxygen. If, for example, it is desired to produce oxygen under an absolute pressure of about 6.3 kg./cm. the air is compressed in the compressor 8 at an absolute pressure of about 21 kg./cm.

Through pipe 9, the air is fed to the water-cooler 10. It then enters the decarbonation tower 11, where carbon dioxide is removed through caustic soda scrubbing. The air is then dried in the desiccation unit 12 and sent through pipe 12A to the exchanger 13, then to the liquefier 14, in which the air is cooled down and liquefied by indirect heat exchange with the liquid-oxygen under pressure.

aaiaeoa Through pipe 15, the liquefied air enters coil 16, which is placed in the lower section of the high pressure column 18. In this coil, the high pressure liquid air is further cooled by indirect heat exchange with the liquid boiling in the lower part of this column. The liquid air is then expanded to an absolute pressure of 8.4 kg/cm. through valve 17, and sent to column 18. This column separates the air into two fractions: a liquid rich in oxygen, and liquid-nitrogen. The liquid rich in oxygen leaves the lower part of this column through pipe 19 and is then cooled down in exchanger 20. It is then filtered in ab sorption filter 21, in order to remove acetylene, and sent through valve 22 to the low pressure column 23. The high pressure column produces a second fraction which is liquid-nitrogen. This liquid-nitrogen leaves column 18 through pipe 24, is cooled in heat exchanger 25 and sent through valve 26 to the top of the low pressure column 23.

The low pressure column 23 works under an absolute pressure of about 2.1 kg./cm. It gives two products:

(a) Liquid-oxygen, which is later compressed to an absolute pressure of 6.3 kg./cm. through pump 27 and sent through pipe 27A to the exchangers 14 and 13, where it is heated, vaporized and finally reheated in the gaseous state, before leaving the unit approximately at ambient temperature.

(b) Gaseous nitrogen, which leaves the top of column 23, is reheated in heat exchanger 25, expanded to an absolute pressure of about 1.25 l g./c1n. in expansion turbine 28. It is then reheated in heat exchanger 20, before entering regenerator 48 through conduit 29. The nitrogen leaves the unit through pipe 30 at approximately ambient temperature and pressure.

I claim:

1. In a process of production of oxygen under pressure by the liquefaction and rectification of air in at least two rectifying zones under successively lower pressures, wherein the air to be separated is divided into two fractions, the first one of which is compressed to a higher pressure than the second one and cooled by heat exchange with liquid oxygen under pressure, then introduced into a rectifying zone and the second one of which is introduced under its original pressure into a rectifying zone, the improvement of maintaining a higher than atmospheric pressure in the rectifying zone under the lowest pressure, and expanding with external work the whole of the separated nitrogen from said lowest pressure to nearly atmospheric pressure.

2. A process according to claim 1, wherein the nitrogen is reheated before its expansion by heat exchange with a liquid leaving a rectification zone and sent to a lower pres! sure rectification zone.

3. A process according to claim 1, wherein the expanded nitrogen is reheated by heat exchange with a liquid originating from a rectification zone and sent to a lower pressure rectification zone.

4, A process of production of oxygen under pressure by the liquefaction and rectification of air in two rectification zones under successively lower pressures, comprising, compressing the air to be. separated, dividing it into two fractions, further compressing a first fraction of the air, cooling said fraction byheat exchange with liquid oxygen under pressure, introducing it into at least a rectification zone, cooling a second fraction of the air by heat exchange with cold gaseous nitrogen and introducing it under its original pressure into a rectification zone, compressing liquid oxygen issued from the lower pressure rectification zone and reheating it by heat exchange with said first fraction of the air, and expanding with external work the.

whole of the gaseous nitrogen issued from the lower pressure rectification zone and. reheating it by heat exchange with said second fraction of the air. t

5. A process according to claim 4, wherein the first fraction of the, air is introduced into the higher pressure column.

6. A process according to claim 5, wherein the gaseous nitrogen is reheated before its expansion with external work by heat exchange with liquid nitrogen extracted in the high pressure rectification zone and sent to the lower.

pressure rectification zone.

7. A process according to claim 5, wherein the gaseous nitrogen is reheated after its expansion with external work,

by heat exchange with a liquid enriched with oxygen originating from the higher pressure rectification zone and sent to the. lower pressure rectification zone.

References Cited in the file of this patent UNITED STATES PATENTS 2,496,380 Crawford Feb. 7, 1950 2,499,043 Voorhees Feb. 28, 1950 2,627,731 Benedict Feb. 10, 1953 2,699,047 Karwat Jan. 11, 1955 2,763,138 Tsunoda Sept. 18, 1956 2,779,174 Vesque Jan. 29, 1957 2,827,775 Linde Mar. 25, 1958 2,873,583 Potts Feb. 17, 1959 FOREIGN PATENTS 1,108,033 France Aug. 17, 1955

Claims (1)

1. IN A PROCESS OF PRODUCTION OF OXYGEN UNDER PRESSURE BY THE LIQUEFACTION AND RECTIFICATION OF AIR IN AT LEAST TWO RECTIFYING ZONES UNDER SUCCESSIVELY LOWER PRESSURES, WHEREIN THE AIR TO BE SEPARATED IS DIVIDED INTO TWO FRACTIONS, THE FIRST ONE OF WHICH IS COMPRESSED TO A HIGHER PRESSURE THAN THE SECOND ONE AND COOLED BY HEAT EXCHANGE WITH LIQUID OXYGEN UNDER PRESSURE, THEN INTRODUCED INTO A RECTIFYING ZONE AND THE SECOND ONE OF WHICH IS INTRODUCED UNDER ITS ORIGINAL PRESSURE INTO A RECTIFYING ZONE, THE IMPROVEMENT OF MAINTAINING A HIGHER THAN ATMOSPHERIC PRESSURE IN THE RECTIFYING ZONE UNDER THE LOWEST PRESSURE, AND EXPANDING WITH EXTERNAL WORK THE WHOLE OF THE SEPARATED NITROGEN FROM SAID LOWEST PRESSURE TO NEARLY ATMOSPHERIC PRESSURE.
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Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3059438A (en) * 1957-05-13 1962-10-23 Air Prod & Chem Apparatus and method for fractionation of gas
US3086371A (en) * 1957-09-12 1963-04-23 Air Prod & Chem Fractionation of gaseous mixtures
US3100696A (en) * 1957-07-04 1963-08-13 Linde Eismasch Ag Method and apparatus for separating gases
US3113854A (en) * 1960-08-25 1963-12-10 Air Prod & Chem Method and apparatus for separating gaseous mixtures
US3129080A (en) * 1960-09-13 1964-04-14 Philips Corp Equipment for supplying both air compressed to high pressure and liquid oxygen
US3180101A (en) * 1959-07-20 1965-04-27 Linde Eismasch Ag Process and apparatus for the production of cold through work-yielding release of pressure
US3210947A (en) * 1961-04-03 1965-10-12 Union Carbide Corp Process for purifying gaseous streams by rectification
US3214925A (en) * 1960-08-13 1965-11-02 Linde Eismasch Ag System for gas separation by rectification at low temperatures
US3216206A (en) * 1961-11-29 1965-11-09 Linde Eismasch Ag Low temperature distillation of normally gaseous substances
US3257814A (en) * 1962-01-05 1966-06-28 Air Liquide Process for the manufacture of oxygen-enriched air
US3261168A (en) * 1961-11-03 1966-07-19 Petrocarbon Dev Ltd Separation of oxygen from air
US3280574A (en) * 1960-10-14 1966-10-25 Linde Ag High pressure pure gas for preventing contamination by low pressure raw gas in reversing regenerators
US3375673A (en) * 1966-06-22 1968-04-02 Hydrocarbon Research Inc Air separation process employing work expansion of high and low pressure nitrogen
US3416323A (en) * 1966-01-13 1968-12-17 Linde Ag Low temperature production of highly compressed gaseous and/or liquid oxygen
US3447331A (en) * 1966-06-01 1969-06-03 British Oxygen Co Ltd Air separation employing waste nitrogen reheated by incoming air in work expansion
US3490246A (en) * 1965-08-20 1970-01-20 Linde Ag Split pressure low temperature process for the production of gases of moderate purity
US3500651A (en) * 1966-01-13 1970-03-17 Linde Ag Production of high pressure gaseous oxygen by low temperature rectification of air
US3699695A (en) * 1965-10-29 1972-10-24 Linde Ag Process of separating air into an oxygen-rich fraction suitable for blast furnace operation
US3754406A (en) * 1970-03-16 1973-08-28 Air Prod & Chem The production of oxygen
US3798917A (en) * 1970-05-12 1974-03-26 Messer Griesheim Gmbh Fractionation of air to obtain oxygen of about seventy percent purity
US4022030A (en) * 1971-02-01 1977-05-10 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Thermal cycle for the compression of a fluid by the expansion of another fluid
US4133662A (en) * 1975-12-19 1979-01-09 Linde Aktiengesellschaft Production of high pressure oxygen
US5165244A (en) * 1991-05-14 1992-11-24 Air Products And Chemicals, Inc. Process to produce oxygen and nitrogen at medium pressure
US5515688A (en) * 1993-02-25 1996-05-14 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process and installation for the production of oxygen and/or nitrogen under pressure

Families Citing this family (2)

* Cited by examiner, † Cited by third party
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FR2461906A1 (en) * 1979-07-20 1981-02-06 Air Liquide Cryogenic air separation method and installation with oxygen production at high pressure
GB2080929B (en) * 1980-07-22 1984-02-08 Air Prod & Chem Producing gaseous oxygen

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US2496380A (en) * 1946-04-18 1950-02-07 Elliott Co Gas purifying method and apparatus
US2499043A (en) * 1947-03-26 1950-02-28 Standard Oil Co Heat exchange
US2627731A (en) * 1949-06-18 1953-02-10 Hydrocarbon Research Inc Rectification of gaseous mixtures
US2699047A (en) * 1950-10-27 1955-01-11 Linde Eismasch Ag Process for cooling and purifying compressed gas mixtures
FR1108033A (en) * 1954-06-29 1956-01-09 Air Liquide A method of cooling separation of gaseous mixtures comprising at least three components
US2763138A (en) * 1954-02-16 1956-09-18 American Messer Corp Process and apparatus for separating gases
US2827775A (en) * 1949-11-11 1958-03-25 Linde Eismasch Ag Process for separating a compressed gas mixture
US2873583A (en) * 1954-05-04 1959-02-17 Union Carbide Corp Dual pressure cycle for air separation

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2496380A (en) * 1946-04-18 1950-02-07 Elliott Co Gas purifying method and apparatus
US2499043A (en) * 1947-03-26 1950-02-28 Standard Oil Co Heat exchange
US2627731A (en) * 1949-06-18 1953-02-10 Hydrocarbon Research Inc Rectification of gaseous mixtures
US2827775A (en) * 1949-11-11 1958-03-25 Linde Eismasch Ag Process for separating a compressed gas mixture
US2699047A (en) * 1950-10-27 1955-01-11 Linde Eismasch Ag Process for cooling and purifying compressed gas mixtures
US2763138A (en) * 1954-02-16 1956-09-18 American Messer Corp Process and apparatus for separating gases
US2873583A (en) * 1954-05-04 1959-02-17 Union Carbide Corp Dual pressure cycle for air separation
FR1108033A (en) * 1954-06-29 1956-01-09 Air Liquide A method of cooling separation of gaseous mixtures comprising at least three components
US2779174A (en) * 1954-06-29 1957-01-29 Air Liquide Low temperature separation of gaseous mixtures

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3059438A (en) * 1957-05-13 1962-10-23 Air Prod & Chem Apparatus and method for fractionation of gas
US3100696A (en) * 1957-07-04 1963-08-13 Linde Eismasch Ag Method and apparatus for separating gases
US3086371A (en) * 1957-09-12 1963-04-23 Air Prod & Chem Fractionation of gaseous mixtures
US3180101A (en) * 1959-07-20 1965-04-27 Linde Eismasch Ag Process and apparatus for the production of cold through work-yielding release of pressure
US3214925A (en) * 1960-08-13 1965-11-02 Linde Eismasch Ag System for gas separation by rectification at low temperatures
US3113854A (en) * 1960-08-25 1963-12-10 Air Prod & Chem Method and apparatus for separating gaseous mixtures
US3129080A (en) * 1960-09-13 1964-04-14 Philips Corp Equipment for supplying both air compressed to high pressure and liquid oxygen
US3280574A (en) * 1960-10-14 1966-10-25 Linde Ag High pressure pure gas for preventing contamination by low pressure raw gas in reversing regenerators
US3210947A (en) * 1961-04-03 1965-10-12 Union Carbide Corp Process for purifying gaseous streams by rectification
US3261168A (en) * 1961-11-03 1966-07-19 Petrocarbon Dev Ltd Separation of oxygen from air
US3216206A (en) * 1961-11-29 1965-11-09 Linde Eismasch Ag Low temperature distillation of normally gaseous substances
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