WO1983003983A1 - Systeme de concentration d'oxygene - Google Patents

Systeme de concentration d'oxygene Download PDF

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Publication number
WO1983003983A1
WO1983003983A1 PCT/US1983/000703 US8300703W WO8303983A1 WO 1983003983 A1 WO1983003983 A1 WO 1983003983A1 US 8300703 W US8300703 W US 8300703W WO 8303983 A1 WO8303983 A1 WO 8303983A1
Authority
WO
WIPO (PCT)
Prior art keywords
tank
flow
oxygen
pressure
molecular sieve
Prior art date
Application number
PCT/US1983/000703
Other languages
English (en)
Inventor
Robert B. Smith
Original Assignee
Marathon Medical Equipment Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Marathon Medical Equipment Corporation filed Critical Marathon Medical Equipment Corporation
Publication of WO1983003983A1 publication Critical patent/WO1983003983A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/047—Pressure swing adsorption
    • B01D53/053—Pressure swing adsorption with storage or buffer vessel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/106—Silica or silicates
    • B01D2253/108—Zeolites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2256/00—Main component in the product gas stream after treatment
    • B01D2256/12—Oxygen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/10—Single element gases other than halogens
    • B01D2257/102—Nitrogen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/80—Water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40003—Methods relating to valve switching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40011—Methods relating to the process cycle in pressure or temperature swing adsorption
    • B01D2259/40043—Purging
    • B01D2259/40045—Purging with two sub-steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40011—Methods relating to the process cycle in pressure or temperature swing adsorption
    • B01D2259/40043—Purging
    • B01D2259/4005—Nature of purge gas
    • B01D2259/40052—Recycled product or process gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40011—Methods relating to the process cycle in pressure or temperature swing adsorption
    • B01D2259/40058—Number of sequence steps, including sub-steps, per cycle
    • B01D2259/40064—Five
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40011—Methods relating to the process cycle in pressure or temperature swing adsorption
    • B01D2259/40077—Direction of flow
    • B01D2259/40079—Co-current
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40011—Methods relating to the process cycle in pressure or temperature swing adsorption
    • B01D2259/40077—Direction of flow
    • B01D2259/40081—Counter-current

Definitions

  • the present invention relates to oxygen. concentra ⁇ tion systems, and more particularly to a novel .and improved oxygen concentration system employing fewer components than heretofore achievable.
  • a flow from the atmosphere is established by means of a port cou ⁇ pled to a pump which provides an airflow through a four-way valve, connected to have a first position which passes a directed flow of atmospheric air through a molecular sieve tank, and thence to an oxygen storage tank.
  • Pressure moni ⁇ toring of the pressure within the oxygen storage tank, pre ⁇ set at a predetermined level, causes the valve to switch at a predetermined point and thereby reverse the operation of the pump,.
  • the pressure monitoring device detects further drops of pressure in the oxygen storage tank and returns the sys-r tem to its initial format, thereby allowing the cycle to re ⁇ peat.
  • an entire purge cycle can be achieved without interrupting the flow of oxygen from the oxygen storage tank and without requiring the use of a second mole ⁇ cular sieve tank.
  • Figure 1 is a schematic diagram of a prior art system.
  • Figure 2 is a schematic diagram of the preferred embodiment of the present invention.
  • Figures 3A and 3B are an enlarged sectional view of the flow valve or switch of Figure 2 shown . in its position I.
  • Figure 4 is similar to Figure 3B showing the flow valve or switch in its position II.
  • Figure 5 is an enlarged schematic diagram of the solenoid valve and needle valve of Figure 2.
  • an inlet port 10 is provided, contianing a suitable filter material 12, for filtering out dust and other atmospheric impurities or the like, coupled by suitable means to a muffler 14.
  • the muffler contains a plurality of baffles and is provided for the purpose of generally reducing noise, quieting vibration and the like.
  • the air flow is maintained by virtue of an electrically driven pump 16, coupled to the output of the muffler 14, which channels air through a suitable hose or fitting to the molecular sieve tanks 26,36.
  • the molecular sieve tanks conventional devices, contain a molecular sieve material 27.
  • the molecular sieve material 27 is generally, a material having a crystalline lattice in the form of a relatively large open structure. It is sufficiently large so that foreign molecules can fit inside
  • the nitrogen component thereof when gas is applied to the molecular sieve tank under pressure, the nitrogen component thereof will be adsorbed, leaving the oxygen content to pass through in greater con ⁇ centration.
  • the output of the pump 16 is coupled by means of suitable couplings to a filter 18 containing a filter mate ⁇ rial for the purpose of further purifying the air passing therethrough, particularly necessary when the pump 16 is a carbon vane pump.
  • the oxygen passes through the fil ⁇ ter, it is diverted through a suitable T-coupling 22.
  • T-coupling 22 On the other side of the T-coupling 22 are further valves 24, 28.
  • the operation of the system is such that when one of the valves is open the other shuts, so that air is directed to the molecular sieve tank 26 in the first in ⁇ stance.
  • the oxygen is passed through a check valve 30 into a storage tank 32, which holds the oxygen therein for delivery.
  • the output port 34 allows for delivery of oxygen from the system.
  • the nature of the molecular sieve tank is that after passing gas therethrough at a typical input pressure of, for example 15 PSI, or a time period typically somewhere between 15 and 25 seconds, the sieve material will no longer adsorb any further nitro ⁇ gen and the nitrogen will pass through the filter, thereby decreasing the concentration of oxygen.
  • the valve 24 is shut and the valve 28 is opened, allowing the flow of atmospheric air through the second molecular sieve tank 36, also connected to the storage tank 32, and the operation repeats itself.
  • the molecular sieve tank 26 is purged by means of a suitable mechanism 40, typically utilizing part of the pres ⁇ sure contained within either oxygen tank 32 or the opposite sieve tank, 36.
  • the purge is a reverse flow of gas through the molecular sieve material which dislodges the adsorbed nitrogen, thereby renewing the molecular sieve material for the next cycle.
  • the tank 36 has become saturated with nitrogen, the situation is reversed and the cycle begins again.
  • This cycle of pressurization, adsorption, oxygen collection and depressurization, along with purging with oxy ⁇ gen, is known as a pressure swing cycle.
  • a continual flow of oxygen from the storage tank 32 out the outlet port 34 is achieved.
  • the foregoing prior art system has certain disadvantages, including and principally the rather complex valving and switching mechanism required, along with the inconvenience and bulk necessitated by having two molecular sieve tanks required in a single system, Since the sieve tanks must be necessarily large in order to provide even 15 or 20 seconds saturation time, the use of two systems or two tanks, along with their attendant val ⁇ - ving and switching disadvantages with respect to both main-- tenance, economy and bulk.
  • the use of the oxygen for purging further .decreases the amount of oxygen available to the ultimate user, thereby undermining the very nature and objectives of this sytem.
  • the com- pressor or pump 16 first performs compression, and then may assist in the purge by evacuation, along with the use of oxygen from the storage tank.
  • the oxygen from the storage tank accomplishes two major objectives. First, it removes any residual nitrogen from the end of the oxygen storage tank, and secondly, lowers the partial pressure of the ni- trogen in the tank so that any nitrogen remaining will tend to be pushed out. As a result, part of the oxygen supply will go to the purging of each tank, alternately, each time a purge cycle is necessary.
  • the present invention utilizes a novel- and unique concept which results in the necessity of only a single molecular sieve tank.
  • a system employing the concepts of the present invention wherein only a single molecular sieve tank is utilized, is illustra ⁇ ted.
  • a port 50 capable of both inlet and exhaust functions.
  • a suitable filter 52 for filtering out impurities, dust, dirt and the like, is located within. the port 50.
  • Suitable ducting is provided for directing the air stream from the port 50 through a muffler 54 containing baffle structures 56 for the purpose of reducing noise, vibration, and. other undesirable vibration characteristics.
  • Suitable output ducting directs the output of the muffler to a flow switch or valve 58.
  • the flow switch 58 is a two position device having a first posi ⁇ tion I shown in solid line and a second flow position II shown in dotted line. In its first position, as shown, the air stream is then continually coupled by means of sui'- table ducting 60 to an electrically operated compressor or pump 62, having an air flow direction shown by the arrows 64.
  • a secondary filter 66 may be coupled to the output of the pump 62, and contains a filter element 68 for futher air purification, particularly if pump 62 is a carbon pump,
  • the output of the secondary filter 66 passes through the flow switch 58 to a molecular sieve tank 70, which may be of conventional construction including a molecular sieve material 72 operating as described hereinabove with respect to prior art systems.
  • the output of the molecular sieve tank 70 is coupled through a one way or check valve 74 to an oxygen storage or ballast tank 76,
  • the output of the oxygen ballast tank is provided via an output port 78 through a pressure regulator 80 of conventional design to a flow adjustment mechanism 82, which includes a flow gauge 84 for measuring the through-flow.
  • the output of the flow adjustment mechanism 82 is coupled to a further-bacterial filter 86, containing a suitable bacterial filtering ate- rial 88, and thence via an output port 90, for' use external to the system.
  • the flow switch 58 described above operates as a four-way valve and can be constructed as four two-way valves, two three-way valves, or one four-way valve for purposes of this invention.
  • Air entering the system passes the muffler 54 and through the valving system 58 to the pump 62.
  • Pas ⁇ sing again through the flow switch 58 the air low enters the molecular sieve tank 70.
  • Cycling occurs by virtue of monitoring pressure in the ballast tank 76. Alterna ⁇ tively, cycling could be done by other -means, such as time monitoring or by monitoring pressure at the oxygen end of the sieve tank.
  • the condition of the entire system may be indicated. This is a key feature of the solution to the problem of cycling.
  • position I that is the solid line position of the flow switch 58
  • air flow is in the direction of arrows 64 through the inlet, muffler, pump, sieve tank 70, oxygen tank 76 and output.
  • pressure slowly increases in the storage tank 76.
  • the pressure switch 93 trips, the pressure switch may be acti ⁇ vated by virtue of a pressure transducer 95 or similar con- ventional pressure measuring device connected to the bal ' - last tank 76. The tripping of the pressure switch causes the flow switch 58 to switch from the position I indicated in solid lines to the position II indicated in dashed lines.
  • the pressure switch 93 causes the flow switch 58 to trip as a result of a motor drive, or air flow through duct 93A to control port 104, located in the flow switch 58, Alter ⁇ natively, switch 93 may be solenoid-activited by means of an electrical contact. In either event, activation of the pressure switch 93 due to predetermined pressure levels in the ballast tank 76 cause the flow switch 58 to switch from the first position I to the second position II, .
  • pump 62 applies suction through ports 96 and 94 of valve 58 to the inlet side 70A of sieve tank 70 which then draws air from the tank 70 backwards through the molecular sieve 72, thence through ports 94 and 96 to and through the pump 62 and fi ⁇ nally-through ports 92 and 98 through filter 52 and out through exhaust 50, thereby drawing down the tank 70 and evacuating same to a partial vacuum condition.
  • purge solenoid valve 97 is activated to open allowing a flow of oxygen from tank- 76, in an amount controlled by a predeter ⁇ - mined orifice such as needle valve 97A, through port 70B of the sieve tank 70, and through the sieve material 72 as a final oxygen purge.
  • the purge solenoid 97 and valve 97A will be described in further detail in later paragraphs, ' This new arrangement and system gives rise to sev ⁇ eral advantages.
  • the purging action required for restoring the molecular sieve filter material 72 to its initial condition is effected by means of the evacuation caused by virtue of the pump 62, Secondly, reversal of the air flow through the port 50 causes the filter 52, which may- have had accumulated dirt, dust, etc, formed along its inlet side to be exhausted b means of the reverse flow effect. Thus, lint and dirt are blown off the inlet filter and back out the exhaust port. As a result, the filter is cleaned each cycle, automatically, and it is no longer necessary to change filters as often as in prior systems. In fact, it is now only necessary to inspect the filter occasionally a year because of various oils or greases or impurities that can ⁇ not be simply purged by air flow. Thus, the life of the filter is significantly increased.
  • the solenoid and nee ⁇ dle valve system is not essential, it is only required that some means of limiting back flow of oxygen from the ballast tank 76 through the molecular sieve tank at a lower pressure be established.
  • a small drilled orifice allowing a small leak of oxygen back through the molecular sieve tank at a certain minimal pressure may be sufficient.
  • the present ' invention actually uses the air pump and the ballast in the ballast tank 76 for purging purposes.
  • the second sieve tank is therefore no longer required, thereby giving rise to the principal advantage of the present invention.
  • the ballast tank 76 is structured sufficiently large to ' handle the flow to a patient and to handle the flow to purge the sieve tank 70,
  • the pressure in the ballast tank reaches its secondary level, i.e., 20 PSI
  • the small amount of oxygen vented back to the sieve tank 70 to purge the remainder of the nitrogen is pumped out by virtue of the action of the evacuation caused by pump 62 through the flow switch 58 to its second position.
  • the present inven ⁇ tion employs an evacuation concept, not simply air pres ⁇ sure flow, for purging purposes.
  • the pressure switch 93 again causes the flow switch 58 to return to its initial position and the cycle begins again.
  • the flow switch " 58 consists of a body 90 having a plurality of inlet and outlet ports, 92, 94, 96 and 98.
  • the central communica ⁇ ting bore 100 is traversed by means of a piston 102 having two positions, position I shown in Figure 3 and indicated by solid lines in Figure 2, and position II shown in Figure 4 and indicated by dotted lines in Figure 2.
  • a further orifice or port 104 shown in Figures 2, 3 and 4 communicates duct 93A with oxygen tank 76 via air flow valve 99 which is acti- vated by pressure switch 93, as previously described.
  • valve 99 causes a vacuum pressure or air pressure to be introduced to the part 104 for the purposes of moving the piston from its solid line position I to its dotted line position II.
  • port 92 is connected through to port 94, and port 96 is con ⁇ nected through to port 98.
  • port 92 is con ⁇ nected through to port 98, and port 94 is connected through to port 96, corresponding to the second position of flow switch 58 indicated in dotted lines.
  • the piston 102 could be solenoid operated, air operated, or motor driven. In the preferred .operation, the piston 102 is driven into position by means of a motor drive 93 as shown in Figure 3A.
  • the motor drive 93 includes a threaded drive 95 which in turn cooperates with an inter- nally threaded opening 97 in the center of the piston 102.
  • the motor drive 93 can force the piston into the initial position as shown in the drawing by virtue of the action of the motor drive 93.
  • An alternative embodiment for positioning the piston 102 is shown in Figure 3B.
  • a third spool 102A is provided on the piston 102 with the additional chamber 102B ( Figure 4) cooperating therewith to create in essence, a smaller air drive chamber.
  • a spring 120 is provided in the end cap 122 for providing a further positive force urging the piston into into position I at normal atmospheric pressure, so that no matter when the machine is turned off, whether pressurizing or de-pressurizing, the spool valve will always start out in the position the pressurizing cycle.
  • the -initial gas purge cycle begins when the pressure switch 93 senses 30 PSI, for example, in tank 76 and acti- vates flow switch 58 as described earlier.
  • the final step is the oxygen purge which occurs when the pressure switch senses 20 PSI, for example, in oxygen tank 76 and activates solenoid valve 97 which allows a flow of oxygen from tank 76 through needle valve 97A at a flow-limiting orifice provided in substitution for the needle valve, through port 107A and into molecular sieve tank 70 to flow backward through the molecular filter material.
  • solenoid valve 97 which allows a flow of oxygen from tank 76 through needle valve 97A at a flow-limiting orifice provided in substitution for the needle valve, through port 107A and into molecular sieve tank 70 to flow backward through the molecular filter material.
  • An additional value 150 may be provided in communi ⁇ cation with the check valve 74 chamber, which may be coupled directly to the flow switch 58 for activation thereof. More specifically, the output of the additional valve 150 may be coupled to the vacuum port 104 of the flow switch 58.
  • valves may be employed in conjunction with the present invention.
  • the four-way valve may be in any form suitable for effecting the passage communi ⁇ cation function described above.
  • the needle valve structure in valve unit 107 for providing a final back flow of oxygen can be provided in various additional forms, such as in component form, rather than integral.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
  • Oxygen, Ozone, And Oxides In General (AREA)

Abstract

Système de concentration d'oxygène délivrant de l'oxygène sans qu'il soit nécessaire d'effectuer une commutation entre deux réservoirs d'absorption à tamis moléculaire. Un réservoir tampon d'oxygène (76) pouvant stocker et fournir l'oxygène stocké est pourvu d'un dispositif de contrôle (94) de la pression à l'intérieur du réservoir et est alimenté par un réservoir à tamis à cycle simple (70) contenant un matériau d'adsorption moléculaire. Un courant de gaz à pression atmosphérique traverse le réservoir à tamis (70) pour en extraire l'azote, et l'oxygène est dirigé du réservoir à tamis (70) vers le réservoir tampon (76). Le dispositif de contrôle (94) est sensible à une augmentation prédéterminée de la pression dans le réservoir tampon (76), et coupe le courant de gaz vers le réservoir tampon (76) et invertit le courant dans le réservoir à tamis (70) pendant un laps de temps prédéterminé pour purger le réservoir à tamis (70) par évacuation. Une bouffée finale d'oxygène depuis le réservoir tampon (76) vers le réservoir à tamis (70) complète la purge.
PCT/US1983/000703 1982-05-07 1983-05-06 Systeme de concentration d'oxygene WO1983003983A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US37618882A 1982-05-07 1982-05-07
US376,188 1982-05-07

Publications (1)

Publication Number Publication Date
WO1983003983A1 true WO1983003983A1 (fr) 1983-11-24

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ID=23484039

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1983/000703 WO1983003983A1 (fr) 1982-05-07 1983-05-06 Systeme de concentration d'oxygene

Country Status (2)

Country Link
EP (1) EP0108140A1 (fr)
WO (1) WO1983003983A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0199430A2 (fr) * 1985-03-21 1986-10-29 Dowty Fuel Systems Limited Installation d'un filtre d'adsorption réactivable
GB2208106A (en) * 1987-05-15 1989-03-01 Medical & Ind Manufacturing Co Apparatus for supplying oxygen
US5858062A (en) * 1997-02-10 1999-01-12 Litton Systems, Inc. Oxygen concentrator
KR20010057308A (ko) * 1999-12-21 2001-07-04 허지석 차량용 직류산소농축기
US6805122B2 (en) 1997-10-01 2004-10-19 Invacare Corporation Oxygen conserving device utilizing a radial multi-stage compressor for high-pressure mobile storage
US7204249B1 (en) 1997-10-01 2007-04-17 Invcare Corporation Oxygen conserving device utilizing a radial multi-stage compressor for high-pressure mobile storage
US9624918B2 (en) 2012-02-03 2017-04-18 Invacare Corporation Pumping device
CN116617814A (zh) * 2023-07-21 2023-08-22 湖南一特医疗股份有限公司 一种多腔体结构的分子筛吸附氧气分离器

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US2955673A (en) * 1958-08-18 1960-10-11 Kahn And Company Inc Process and apparatus for dehydrating gas
US3147095A (en) * 1960-08-19 1964-09-01 Great Lakes Mfg Corp Dehydration apparatus
US3160486A (en) * 1962-04-24 1964-12-08 Gilbert & Barker Mfg Co Fluid operated timing apparatus
US3182435A (en) * 1960-04-29 1965-05-11 Exxon Research Engineering Co Apparatus for fractionation of gaseous mixtures
US3395511A (en) * 1963-10-03 1968-08-06 Atlas Copco Ab Method and means for obtaining dry gas or air
US3399510A (en) * 1966-05-25 1968-09-03 Air Technologies Inc Process and apparatus for dehydrating compressed gas
US3464186A (en) * 1967-02-10 1969-09-02 Hankison Corp Dryer for compressed fluid systems
US3659399A (en) * 1970-06-29 1972-05-02 Air Technologies Inc Fractionation by adsorption
US3778967A (en) * 1971-01-18 1973-12-18 Air Technologies Inc Apparatus and process for the fractionation by the adsorption of a compressed gas
US3922149A (en) * 1974-01-30 1975-11-25 Garrett Corp Oxygen air enrichment method
US4065272A (en) * 1975-01-02 1977-12-27 Boc International Limited Oxygen-enriched air

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2955673A (en) * 1958-08-18 1960-10-11 Kahn And Company Inc Process and apparatus for dehydrating gas
US3182435A (en) * 1960-04-29 1965-05-11 Exxon Research Engineering Co Apparatus for fractionation of gaseous mixtures
US3147095A (en) * 1960-08-19 1964-09-01 Great Lakes Mfg Corp Dehydration apparatus
US3160486A (en) * 1962-04-24 1964-12-08 Gilbert & Barker Mfg Co Fluid operated timing apparatus
US3395511A (en) * 1963-10-03 1968-08-06 Atlas Copco Ab Method and means for obtaining dry gas or air
US3399510A (en) * 1966-05-25 1968-09-03 Air Technologies Inc Process and apparatus for dehydrating compressed gas
US3464186A (en) * 1967-02-10 1969-09-02 Hankison Corp Dryer for compressed fluid systems
US3659399A (en) * 1970-06-29 1972-05-02 Air Technologies Inc Fractionation by adsorption
US3778967A (en) * 1971-01-18 1973-12-18 Air Technologies Inc Apparatus and process for the fractionation by the adsorption of a compressed gas
US3922149A (en) * 1974-01-30 1975-11-25 Garrett Corp Oxygen air enrichment method
US4065272A (en) * 1975-01-02 1977-12-27 Boc International Limited Oxygen-enriched air

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0199430A2 (fr) * 1985-03-21 1986-10-29 Dowty Fuel Systems Limited Installation d'un filtre d'adsorption réactivable
EP0199430A3 (fr) * 1985-03-21 1987-09-30 Dowty Fuel Systems Limited Installation d'un filtre d'adsorption réactivable
GB2208106A (en) * 1987-05-15 1989-03-01 Medical & Ind Manufacturing Co Apparatus for supplying oxygen
GB2208106B (en) * 1987-05-15 1991-10-16 Medical & Ind Manufacturing Co Apparatus for supplying oxygen
US5858062A (en) * 1997-02-10 1999-01-12 Litton Systems, Inc. Oxygen concentrator
US6805122B2 (en) 1997-10-01 2004-10-19 Invacare Corporation Oxygen conserving device utilizing a radial multi-stage compressor for high-pressure mobile storage
US6923180B2 (en) 1997-10-01 2005-08-02 Invacare Corporation Oxygen conserving device utilizing a radial multi-stage compressor for high-pressure mobile storage
US7204249B1 (en) 1997-10-01 2007-04-17 Invcare Corporation Oxygen conserving device utilizing a radial multi-stage compressor for high-pressure mobile storage
US7294170B2 (en) 1997-10-01 2007-11-13 Invacare Corporation Apparatus for compressing and storing oxygen enriched gas
KR20010057308A (ko) * 1999-12-21 2001-07-04 허지석 차량용 직류산소농축기
US9624918B2 (en) 2012-02-03 2017-04-18 Invacare Corporation Pumping device
CN116617814A (zh) * 2023-07-21 2023-08-22 湖南一特医疗股份有限公司 一种多腔体结构的分子筛吸附氧气分离器
CN116617814B (zh) * 2023-07-21 2023-09-19 湖南一特医疗股份有限公司 一种多腔体结构的分子筛吸附氧气分离器

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Publication number Publication date
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