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USRE38001E1 - Cleaning with liquid gases - Google Patents

Cleaning with liquid gases Download PDF

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Publication number
USRE38001E1
USRE38001E1 US09/585,581 US58558100A USRE38001E US RE38001 E1 USRE38001 E1 US RE38001E1 US 58558100 A US58558100 A US 58558100A US RE38001 E USRE38001 E US RE38001E
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United States
Prior art keywords
carbon dioxide
cleaning
pressure
temperature
pressure vessel
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Expired - Lifetime
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US09/585,581
Inventor
Robert Adler
Stefan Rief
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Linde Gas AG
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Linde Gas AG
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Priority to US09/585,581 priority Critical patent/USRE38001E1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B08B7/0021—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by liquid gases or supercritical fluids
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/50—Solvents
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
    • D06L1/00—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
    • C11D2111/10—Objects to be cleaned
    • C11D2111/14—Hard surfaces
    • C11D2111/20—Industrial or commercial equipment, e.g. reactors, tubes or engines

Definitions

  • the invention relates to a method for cleaning objects in pressure vessel with liquefied gases.
  • a method of this kind for cleaning workpieces, especially metal pipes, containing organic residues such as oils and greases is known from patent application WO92/14558.
  • liquefied gases such as carbon dioxide are used as the cleaning fluid.
  • the cleaning fluid is conducted into a pressure vessel loaded with the workpieces and circulated therein by means of an impeller. After the cleaning process is complete, a portion of the fluid laden with organic residues is conducted out of the pressure vessel together with fresh cleaning fluid into another pressure vessel. The surface tension of the remainder of the fluid loaded with impurities is reduced by a turbine, causing the impurities to precipitate out.
  • the cleaned workpieces are then removed from the empty pressure vessel, while additional workpieces can be cleaned in the second pressure vessel.
  • German patent document DE-42 30 385 a device for cleaning smaller workpieces that uses liquefied gases is known from German patent document DE-42 30 385.
  • a drum is mounted rotatably and/or pivotably in a pressure-tight container and is connected to a drive device. The rotation of the drum sets both the cleaning fluid in the pressure-tight vessel and the objects present in the drum in turbulent motion, thus increasing the cleaning effect.
  • Chemical solvents, mechanical scouring agents, and added insert gases can increase the cleaning effect.
  • at least one lock for loading and unloading the objects is provided on the pressure-tight vessel. These locks make it unnecessary to completely vent the pressure-tight vessel to load or remove the objects.
  • Liquid carbon dioxide at temperatures between 20° C. and approximately 30° C. is used in the method in the two patent documents mentioned above, with pressures corresponding to the vapor pressure values.
  • a method for cleaning textiles by means of liquefied or supercritical carbon dioxide is known from WO 94/01613.
  • the carbon dioxide is conducted into a pressure vessel loaded with the textiles at temperatures between 20° C. and 100° C. and corresponding pressures between 60 and 350 bars.
  • displacement rinsing is performed using a second fluid.
  • the second fluid is again a compressed gas such as air or nitrogen.
  • a method for removing impurities from a substrate is known from WO 90/06189.
  • a substrate is brought into contact by means of a compressed gas with fluid-like density at critical or supercritical pressure, with the phase of the gas being shifted between the liquid state and the supercritical state by varying the temperature of the gas in a series of stages between supercritical temperatures and subcritical temperatures.
  • This multistage temperature variation is discontinued by a change in the cohesion energy content of the gas in the dense phase.
  • An effort is therefore made to adjust the solvency of the compressed gas relative to an impurity in an effective manner. Mechanical interactions between the compressed gas and the impurities are not taken into account.
  • the goal of the present invention is therefore to develop a cleaning method using liquefied gases in which the same cleaning results can be achieved at lower cost.
  • This goal is achieved according to the invention by virtue of the fact that gas liquefied under pressure is conducted into the pressure vessel containing objects to be cleaned. The temperature of the liquefied gas is then (or even earlier) lowered below the critical temperature of the gas. Cleaning is conducted at least primarily below the critical temperature and below the critical temperature of the gas.
  • the figure is a schematic diagram of a pressure vessel having a drum therein for use with the method according to the present invention.
  • the increased mechanical interaction lies in a higher mass transport of fluid to the surface to be cleaned because of the increased density and in the greater shearing forces between the fluid and the substrate surface because of the increased viscosity of the fluid.
  • the viscosity increases exponentially with the reciprocal of the temperature.
  • noble gases such as helium or argon
  • hydrocarbons such as methane, ethylene, propane, ethene, or propene, as well as trifluoromethane, carbon dioxide, dinitrogen monoxide, and sulfur hexafluoride are suitable as fluids for example.
  • the liquefied gas is loaded into the pressure vessel until it fills a portion thereof.
  • the liquefied gas is then in equilibrium with its gaseous phase.
  • the pressure vessel may be further filled with liquefied gas until it is exclusively in the liquid phase. Then, the density and viscosity of the liquid can be increased even further when the pressure in the pressure vessel is increased while keeping the temperature constant.
  • carbon dioxide is especially preferable and is used at pressures from below 60 bars with an equilibrium of the liquid and gaseous phases at temperatures between ⁇ 20° C. and +20° C. for the cleaning method according to the invention.
  • the pressure vessel can be filled completely with liquid carbon dioxide, with the temperature then being kept constant at a value between ⁇ 20° C. and +20° C., and the pressure being raised to a value above the corresponding value on the vapor pressure curve.
  • the mechanical interactions can be increased if the liquefied gas and/or the object to be cleaned are circulated in the pressure vessel 10 (see the Figure). This is accomplished in known fashion via an impeller or a rotatable drum 12 in the pressure vessel 10 .
  • the pressure vessel is only partially filled with liquefied gas, additional frictional action on the surface of the contaminated objects takes place when the objects to be cleaned are circulated, as a result of the objects being constantly lifted out of, and submerged in, the liquid phase.
  • the mechanical interaction can be increased if the drum is operated intermittently and/or with a change in the direction of rotation (see arrows in the Figure).
  • pressure values that are lower by comparison with the known method are especially advantageous, beginning with a temperature drop in contrast to the temperature increase required in earlier cleaning methods.
  • liquefied carbon dioxide which is liquid at room temperature (25° C., 67 bars) is cooled to 10° C. and placed in a pressure vessel designed for approximately 100 bars.
  • the addition of enzymes, emulsifiers, and/or surfactants (detergents) that are suitable for liquefied carbon dioxide for example can further increase the success of cleaning. Suitable additives will be found by the individual skilled in the art in the pertinent literature, for example in the specification of European Patent document EP-0 530 949-A1.
  • the method according to the invention has proven in many tests to be especially effective for cleaning textiles. It is also suitable for cleaning metal surfaces or electronic assemblies such as PC boards to remove impurities that mostly contain organic residues.
  • test fabric contaminated with various greases was cleaned in a pressure vessel to which liquefied carbon dioxide had been added.
  • the pressure vessel contains a drum that rotates inside the pressure vessel, causing the textiles and the liquefied gas to move relative to one another.
  • the gas is drawn from a supply container in which carbon dioxide liquefied under pressure is at ambient temperature, and the pressure vessel is partially filled.
  • the temperature in the pressure vessel is lowered to about 10° C., while the drum is set rotating.
  • the pressure vessel can be filled completely once again, and the temperature of the liquid carbon dioxide is kept constant at about 10° C. while the pressure is raised to more than 45 bars.
  • the pressure can be increased up to 70 bars (below critical pressure), for example. Cleaning results however are completely sufficient with a lesser pressure increase, so that operating and system costs can be reduced significantly in comparison to previous cleaning methods.
  • the working of the method and possible addition of surfactants can be selected as a function of the type of contamination. After cleaning, the contaminated carbon dioxide is removed and can be reused after reduction of surface tension, when the impurities precipitate out. This contributes to environmental protection and reduces costs further.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Textile Engineering (AREA)
  • Organic Chemistry (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Cleaning In General (AREA)
  • Treating Waste Gases (AREA)
  • Gas Separation By Absorption (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

A method for cleaning objects in a pressure vessel with liquefied gases is provided. The gas liquefied under pressure is conducted into the pressure vessel. The temperature of the liquefied gas then, or beforehand, is lowered below the critical temperature of the gas and cleaning is performed at least primarily below the critical temperature and below the critical pressure of the gas. Carbon dioxide at temperatures between −20° C. and +20° C. is especially suitable. The mechanical interactions produced by the increased density and viscosity of the liquefied gas reinforce cleaning. Reduced solvent capacity does not influence the effectiveness of the cleaning. Textiles or components can therefore be cleaned at lower pressure and temperature.

Description

BACKGROUND AND SUMMARY OF THE INVENTION
The invention relates to a method for cleaning objects in pressure vessel with liquefied gases.
A method of this kind for cleaning workpieces, especially metal pipes, containing organic residues such as oils and greases is known from patent application WO92/14558. In this application, liquefied gases such as carbon dioxide are used as the cleaning fluid. The cleaning fluid is conducted into a pressure vessel loaded with the workpieces and circulated therein by means of an impeller. After the cleaning process is complete, a portion of the fluid laden with organic residues is conducted out of the pressure vessel together with fresh cleaning fluid into another pressure vessel. The surface tension of the remainder of the fluid loaded with impurities is reduced by a turbine, causing the impurities to precipitate out. The cleaned workpieces are then removed from the empty pressure vessel, while additional workpieces can be cleaned in the second pressure vessel.
In addition, a device for cleaning smaller workpieces that uses liquefied gases is known from German patent document DE-42 30 385. In the German patent document, a drum is mounted rotatably and/or pivotably in a pressure-tight container and is connected to a drive device. The rotation of the drum sets both the cleaning fluid in the pressure-tight vessel and the objects present in the drum in turbulent motion, thus increasing the cleaning effect. Chemical solvents, mechanical scouring agents, and added insert gases can increase the cleaning effect. To permit quasi-continuous operation, at least one lock for loading and unloading the objects is provided on the pressure-tight vessel. These locks make it unnecessary to completely vent the pressure-tight vessel to load or remove the objects.
Liquid carbon dioxide at temperatures between 20° C. and approximately 30° C. is used in the method in the two patent documents mentioned above, with pressures corresponding to the vapor pressure values.
In addition, a method for cleaning textiles by means of liquefied or supercritical carbon dioxide is known from WO 94/01613. In this patent document, the carbon dioxide is conducted into a pressure vessel loaded with the textiles at temperatures between 20° C. and 100° C. and corresponding pressures between 60 and 350 bars. After the textiles have been washed, displacement rinsing is performed using a second fluid. The second fluid is again a compressed gas such as air or nitrogen.
A method for removing impurities from a substrate is known from WO 90/06189. In this patent document, a substrate is brought into contact by means of a compressed gas with fluid-like density at critical or supercritical pressure, with the phase of the gas being shifted between the liquid state and the supercritical state by varying the temperature of the gas in a series of stages between supercritical temperatures and subcritical temperatures. This multistage temperature variation is discontinued by a change in the cohesion energy content of the gas in the dense phase. An effort is therefore made to adjust the solvency of the compressed gas relative to an impurity in an effective manner. Mechanical interactions between the compressed gas and the impurities are not taken into account.
These known cleaning methods utilize the cleaning ability of compressed fluids, which increases drastically in the supercritical range. Supercritical carbon dioxide with a temperature above 31° C. at pressures above 73.7 bars has a density comparable to the liquid phase and a good solvency that increases even further with an increase in temperature. Of course, the interactions of the fluid with the substance to be dissolved (impurities) are important for the success of the cleaning.
In the practical application, these cleaning methods suffer from an important disadvantage that lies in the use of high (supercritical) pressures, which in turn necessitates the use of expensive pressure vessels with high energy and equipment costs.
The goal of the present invention is therefore to develop a cleaning method using liquefied gases in which the same cleaning results can be achieved at lower cost.
This goal is achieved according to the invention by virtue of the fact that gas liquefied under pressure is conducted into the pressure vessel containing objects to be cleaned. The temperature of the liquefied gas is then (or even earlier) lowered below the critical temperature of the gas. Cleaning is conducted at least primarily below the critical temperature and below the critical temperature of the gas.
Other objects, advantages and novel features of the present invention will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawing.
BRIEF DESCRIPTION OF THE DRAWING
The figure is a schematic diagram of a pressure vessel having a drum therein for use with the method according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Surprisingly, it has been found that the density and viscosity of gases to be compressed to the liquid phase can be increased by lowering the temperature sufficiently far below its critical temperature. The mechanical interactions between the cleaning fluid and the impurities guarantee cleaning success although the solvency of the liquefied gas under these physical parameters is drastically reduced in comparison to the previous method.
The increased mechanical interaction lies in a higher mass transport of fluid to the surface to be cleaned because of the increased density and in the greater shearing forces between the fluid and the substrate surface because of the increased viscosity of the fluid. The viscosity increases exponentially with the reciprocal of the temperature.
To remove organic residues for example, noble gases such as helium or argon, hydrocarbons such as methane, ethylene, propane, ethene, or propene, as well as trifluoromethane, carbon dioxide, dinitrogen monoxide, and sulfur hexafluoride are suitable as fluids for example.
For cleaning, the liquefied gas is loaded into the pressure vessel until it fills a portion thereof. The liquefied gas is then in equilibrium with its gaseous phase. After a certain cleaning time, the pressure vessel may be further filled with liquefied gas until it is exclusively in the liquid phase. Then, the density and viscosity of the liquid can be increased even further when the pressure in the pressure vessel is increased while keeping the temperature constant.
For known reasons, carbon dioxide is especially preferable and is used at pressures from below 60 bars with an equilibrium of the liquid and gaseous phases at temperatures between −20° C. and +20° C. for the cleaning method according to the invention.
Unexpectedly, in this parameter range the mechanical interactions of the liquefied carbon dioxide with high density and viscosity overcome the reduced solvency.
During cleaning or at the beginning thereof, the pressure vessel can be filled completely with liquid carbon dioxide, with the temperature then being kept constant at a value between −20° C. and +20° C., and the pressure being raised to a value above the corresponding value on the vapor pressure curve.
The mechanical interactions can be increased if the liquefied gas and/or the object to be cleaned are circulated in the pressure vessel 10 (see the Figure). This is accomplished in known fashion via an impeller or a rotatable drum 12 in the pressure vessel 10.
If the pressure vessel is only partially filled with liquefied gas, additional frictional action on the surface of the contaminated objects takes place when the objects to be cleaned are circulated, as a result of the objects being constantly lifted out of, and submerged in, the liquid phase.
When a rotating drum is used, the mechanical interaction can be increased if the drum is operated intermittently and/or with a change in the direction of rotation (see arrows in the Figure).
Especially good cleaning results for contamination with organic residues such as oils and greases are obtained by using carbon dioxide at temperatures of 5° C. to 15° C., preferably 10° C.
In this type of cleaning, pressure values that are lower by comparison with the known method are especially advantageous, beginning with a temperature drop in contrast to the temperature increase required in earlier cleaning methods. This means firstly a reduced energy expenditure and secondly, lower system costs for system components that are resistant to high pressure. For the cleaning method according to the invention for example, liquefied carbon dioxide which is liquid at room temperature (25° C., 67 bars) is cooled to 10° C. and placed in a pressure vessel designed for approximately 100 bars. The addition of enzymes, emulsifiers, and/or surfactants (detergents) that are suitable for liquefied carbon dioxide for example can further increase the success of cleaning. Suitable additives will be found by the individual skilled in the art in the pertinent literature, for example in the specification of European Patent document EP-0 530 949-A1.
The method according to the invention has proven in many tests to be especially effective for cleaning textiles. It is also suitable for cleaning metal surfaces or electronic assemblies such as PC boards to remove impurities that mostly contain organic residues.
In one version of the method according to the invention, test fabric contaminated with various greases was cleaned in a pressure vessel to which liquefied carbon dioxide had been added. The pressure vessel contains a drum that rotates inside the pressure vessel, causing the textiles and the liquefied gas to move relative to one another. The gas is drawn from a supply container in which carbon dioxide liquefied under pressure is at ambient temperature, and the pressure vessel is partially filled. The temperature in the pressure vessel is lowered to about 10° C., while the drum is set rotating.
During cleaning, the liquid and gaseous phases through which the test fabrics are transported mix with one another, so that frictional effects occur that promote cleaning. If necessary, after a certain period of cleaning, the pressure vessel can be filled completely once again, and the temperature of the liquid carbon dioxide is kept constant at about 10° C. while the pressure is raised to more than 45 bars. The pressure can be increased up to 70 bars (below critical pressure), for example. Cleaning results however are completely sufficient with a lesser pressure increase, so that operating and system costs can be reduced significantly in comparison to previous cleaning methods.
The working of the method and possible addition of surfactants can be selected as a function of the type of contamination. After cleaning, the contaminated carbon dioxide is removed and can be reused after reduction of surface tension, when the impurities precipitate out. This contributes to environmental protection and reduces costs further.
Although the invention has been described and illustrated in detail, it is to be clearly understood that the same is by way of illustration and example, and is not to be taken by way of limitation. The spirit and scope of the present invention are to be limited only by the terms of the appended claims.

Claims (24)

What is claimed is:
1. A method for cleaning objects in a pressure vessel using carbon dioxide, the method comprisingthe steps of :
conducting the carbon dioxide under pressure into the pressure vessel containing the objects to be cleaned, wherein the pressure vessel is only partially filled with liquid carbon dioxide;
maintaining or lowering the temperature of the carbon dioxide below the critical temperature; and
performing a cleaning operation at least primarily below the critical temperature and below the critical pressure of the carbon dioxide, wherein liquid and gas phases of the carbon dioxide are in equilibrium for a portion of the cleaning, ;
wherein the temperature is kept constant at a value between −20° C. and +20° C. and the pressure is raised to a value above the corresponding vapor pressure during a portion of the cleaning.
2. The method according to claim 1, wherein the cleaning operation further comprises the step of circulating at least one of the carbon dioxide and the objects to be cleaned in the pressure vessel.
3. The method according to claim 2, wherein said circulating step is carried out via a drum mounted at least one of rotatably and pivotably in the pressure vessel, and wherein said drum is operated at least one of intermittently and with a changing direction of rotation.
4. The method according to claim 1, wherein the carbon dioxide in the cleaning step is at a temperature of 5° C. to 15° C.
5. The method according to claim 1, wherein the carbon dioxide in the cleaning step is at a temperature of 15° C.
6. The method according to claim 1, further comprising the step of adding at least one of enzymes, emulsifiers, surfactants, and detergents to the carbon dioxide.
7. The method according to claim 1, wherein said method is used for cleaning textiles.
8. The method according to claim 1, wherein said method is used for cleaning components.
9. The method according to claim 1, wherein the pressure vessel is only partially filled with the carbon dioxide.
10. The method according to claim 1, wherein the pressure vessel is completely filled with the carbon dioxide.
11. The method according to claim 1, wherein the pressure of the carbon dioxide is below 60 bars.
12. The method according to claim 2, wherein the carbon dioxide in the cleaning step is at a temperature of 5° C. to 15° C.
13. The method according to claim 4, wherein the carbon dioxide in the cleaning step is at a temperature of 10° C.
14. The method according to claim 2, further comprising the step of adding at least one of enzymes, emulsifiers, surfactants, and detergents to the carbon dioxide.
15. The method according to claim 4, further comprising the step of adding at least one of enzymes, emulsifiers, surfactants, and detergents to the carbon dioxide.
16. The method according to claim 1, wherein the pressure of the carbon dioxide is between 45 and 70 bars.
17. The method according to claim 4, wherein the pressure of the carbon dioxide is between 45 and 70 bars.
18. The method according to claim 12, wherein the pressure of the carbon dioxide is between 45 and 70 bars.
19. The method according to claim 15, wherein the pressure of the carbon dioxide is between 45 and 70 bars.
20. The method according to claim 1, wherein the pressure of the carbon dioxide is above 45 bars.
21. The method according to claim 4, wherein the pressure of the carbon dioxide is above 45 bars.
22. A method according to claim 1, wherein the temperature of the carbon dioxide is maintained below the critical temperature.
23. A method for cleaning objects in a pressure vessel using carbon dioxide, the method comprising:
conducting the carbon dioxide under pressure into the pressure vessel containing the objects to be cleaned, wherein the pressure vessel is only partially filled with liquid carbon dioxide;
maintaining or lowering the temperature of the carbon dioxide below the critical temperature;
adding enzymes to the carbon dioxide; and
performing a cleaning operation at least primarily below the critical temperature and below the critical pressure of the carbon dioxide, wherein liquid and gas phases of the carbon dioxide are in equilibrium for a portion of the cleaning;
wherein the temperature is kept constant at a value between −20° C. and +20° C. and the pressure is raised to a value above the corresponding vapor pressure during a portion of the cleaning.
24. A method for cleaning objects in a pressure vessel using carbon dioxide, the method comprising:
conducting the carbon dioxide under pressure into the pressure vessel containing at least one of an electronic assembly or an object having a metal surface, wherein the pressure vessel is only partially filled with liquid carbon dioxide;
maintaining or lowering the temperature of the carbon dioxide below the critical temperature; and
performing a cleaning operation at least primarily below the critical temperature and below the critical pressure of the carbon dioxide, wherein liquid and gas phases of the carbon dioxide are in equilibrium for a portion of the cleaning;
wherein the temperature is kept constant at a value between −20° C. and +20° C. and the pressure is raised to a value above the corresponding vapor pressure during a portion of the cleaning.
US09/585,581 1995-03-16 2000-06-02 Cleaning with liquid gases Expired - Lifetime USRE38001E1 (en)

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DE19509573A DE19509573C2 (en) 1995-03-16 1995-03-16 Cleaning with liquid carbon dioxide
DE19509573 1995-03-16
US08/616,751 US5759209A (en) 1995-03-16 1996-03-15 Cleaning with liquid gases
US09/585,581 USRE38001E1 (en) 1995-03-16 2000-06-02 Cleaning with liquid gases

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1618970A1 (en) * 2004-07-22 2006-01-25 Linde Aktiengesellschaft Carbon dioxide cleaning method
US20090305187A1 (en) * 2006-07-24 2009-12-10 Koninklijke Philips Electronics N.V. Liquid interdental cleaner
US9091017B2 (en) 2012-01-17 2015-07-28 Co2Nexus, Inc. Barrier densified fluid cleaning system

Families Citing this family (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6148644A (en) * 1995-03-06 2000-11-21 Lever Brothers Company, Division Of Conopco, Inc. Dry cleaning system using densified carbon dioxide and a surfactant adjunct
EP0893166A4 (en) * 1996-09-25 2004-11-10 Shuzurifuresher Kaihatsukyodok Washing means using liquefied gas of high density
US7338563B2 (en) * 1996-10-16 2008-03-04 Clark Steve L Process for cleaning hydrocarbons from soils
US7534304B2 (en) 1997-04-29 2009-05-19 Whirlpool Corporation Non-aqueous washing machine and methods
US6045588A (en) 1997-04-29 2000-04-04 Whirlpool Corporation Non-aqueous washing apparatus and method
US6200352B1 (en) 1997-08-27 2001-03-13 Micell Technologies, Inc. Dry cleaning methods and compositions
US6218353B1 (en) 1997-08-27 2001-04-17 Micell Technologies, Inc. Solid particulate propellant systems and aerosol containers employing the same
US5858022A (en) * 1997-08-27 1999-01-12 Micell Technologies, Inc. Dry cleaning methods and compositions
US6012307A (en) * 1997-12-24 2000-01-11 Ratheon Commercial Laundry Llc Dry-cleaning machine with controlled agitation
TW426775B (en) * 1998-03-16 2001-03-21 Ind Tech Res Inst Method of fibers scouring
US6098430A (en) * 1998-03-24 2000-08-08 Micell Technologies, Inc. Cleaning apparatus
US5977045A (en) * 1998-05-06 1999-11-02 Lever Brothers Company Dry cleaning system using densified carbon dioxide and a surfactant adjunct
CA2255413A1 (en) 1998-12-11 2000-06-11 Fracmaster Ltd. Foamed nitrogen in liquid co2 for fracturing
DE19859408A1 (en) * 1998-12-22 2000-07-06 Preussag Ag Minimax Procedure for cleaning vessels for liquids, and preferably steel vessels used in drinks industry, entails bringing internal faces of vessel into contact with liquid carbon dioxide
US6212916B1 (en) 1999-03-10 2001-04-10 Sail Star Limited Dry cleaning process and system using jet agitation
US6260390B1 (en) 1999-03-10 2001-07-17 Sail Star Limited Dry cleaning process using rotating basket agitation
US7044143B2 (en) * 1999-05-14 2006-05-16 Micell Technologies, Inc. Detergent injection systems and methods for carbon dioxide microelectronic substrate processing systems
EP1144565A3 (en) * 1999-06-11 2001-11-28 Raytheon Company Liquid carbon dioxide cleaning utilizing natural solvents
US6355072B1 (en) * 1999-10-15 2002-03-12 R.R. Street & Co. Inc. Cleaning system utilizing an organic cleaning solvent and a pressurized fluid solvent
US6558432B2 (en) * 1999-10-15 2003-05-06 R. R. Street & Co., Inc. Cleaning system utilizing an organic cleaning solvent and a pressurized fluid solvent
US7097715B1 (en) 2000-10-11 2006-08-29 R. R. Street Co. Inc. Cleaning system utilizing an organic cleaning solvent and a pressurized fluid solvent
US6755871B2 (en) 1999-10-15 2004-06-29 R.R. Street & Co. Inc. Cleaning system utilizing an organic cleaning solvent and a pressurized fluid solvent
US6776801B2 (en) 1999-12-16 2004-08-17 Sail Star Inc. Dry cleaning method and apparatus
US6475403B2 (en) * 2000-01-31 2002-11-05 Matsushita Electric Industrial Co., Ltd. Etching method and apparatus
US6248136B1 (en) 2000-02-03 2001-06-19 Micell Technologies, Inc. Methods for carbon dioxide dry cleaning with integrated distribution
WO2001060534A1 (en) * 2000-02-18 2001-08-23 Eco2 Sa Device and method for the precision cleaning of objects
US7513132B2 (en) 2003-10-31 2009-04-07 Whirlpool Corporation Non-aqueous washing machine with modular construction
US6679067B1 (en) 2001-07-16 2004-01-20 C W Holdings Llc Cryogenic processes for treating pantyhose
RU2209166C1 (en) 2002-06-07 2003-07-27 ООО "Марс" Package with sound reproduction
EP1442802A1 (en) * 2003-01-28 2004-08-04 Linde Aktiengesellschaft Cleaning with liquid carbon dioxide
US7300468B2 (en) 2003-10-31 2007-11-27 Whirlpool Patents Company Multifunctioning method utilizing a two phase non-aqueous extraction process
US7739891B2 (en) 2003-10-31 2010-06-22 Whirlpool Corporation Fabric laundering apparatus adapted for using a select rinse fluid
US7695524B2 (en) 2003-10-31 2010-04-13 Whirlpool Corporation Non-aqueous washing machine and methods
US7513004B2 (en) 2003-10-31 2009-04-07 Whirlpool Corporation Method for fluid recovery in a semi-aqueous wash process
EP1740757A1 (en) 2004-04-29 2007-01-10 Unilever N.V. Dry cleaning method
KR20070092955A (en) 2004-10-25 2007-09-14 나논 에이/에스 Method for preparing silicone rubber items and products obtainable by the method
US7966684B2 (en) 2005-05-23 2011-06-28 Whirlpool Corporation Methods and apparatus to accelerate the drying of aqueous working fluids
DE102007049286A1 (en) 2007-10-12 2009-04-23 Thomas Zundel Cleaning textiles, furs, leather or leather imitations, comprises cleaning the parts with a liquid cleaning agent by adding a cleaning enhancer in a cleaning drum and adding prespray soap wetted sponges to increase the cleaning capacity
CA3153460A1 (en) 2021-03-30 2022-09-30 Kyata Capital Inc. Systems and methods for removing contaminants from surfaces of solid material

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990006189A1 (en) * 1988-12-07 1990-06-14 Hughes Aircraft Company Cleaning process using phase shifting of dense phase gases
WO1992014558A1 (en) * 1991-02-19 1992-09-03 Union Industrie Comprimierter Gase Gmbh Nfg. Kg Process for cleaning workpieces contaminated with organic matter
US5267455A (en) * 1992-07-13 1993-12-07 The Clorox Company Liquid/supercritical carbon dioxide dry cleaning system
DE4230485A1 (en) * 1992-09-11 1994-03-17 Linde Ag System for cleaning with liquefied or supercritical gases
EP0530949B1 (en) * 1991-09-04 1995-09-06 The Clorox Company Cleaning through perhydrolysis conducted in dense fluid medium
US5467492A (en) * 1994-04-29 1995-11-21 Hughes Aircraft Company Dry-cleaning of garments using liquid carbon dioxide under agitation as cleaning medium

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5316591A (en) 1992-08-10 1994-05-31 Hughes Aircraft Company Cleaning by cavitation in liquefied gas
CA2120537A1 (en) 1993-04-12 1994-10-13 Thomas B. Stanford, Jr. Megasonic cleaning system using compressed, condensed gases

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990006189A1 (en) * 1988-12-07 1990-06-14 Hughes Aircraft Company Cleaning process using phase shifting of dense phase gases
WO1992014558A1 (en) * 1991-02-19 1992-09-03 Union Industrie Comprimierter Gase Gmbh Nfg. Kg Process for cleaning workpieces contaminated with organic matter
EP0530949B1 (en) * 1991-09-04 1995-09-06 The Clorox Company Cleaning through perhydrolysis conducted in dense fluid medium
US5267455A (en) * 1992-07-13 1993-12-07 The Clorox Company Liquid/supercritical carbon dioxide dry cleaning system
WO1994001613A1 (en) * 1992-07-13 1994-01-20 The Clorox Company Liquid/supercritical carbon dioxide dry cleaning system
DE4230485A1 (en) * 1992-09-11 1994-03-17 Linde Ag System for cleaning with liquefied or supercritical gases
US5467492A (en) * 1994-04-29 1995-11-21 Hughes Aircraft Company Dry-cleaning of garments using liquid carbon dioxide under agitation as cleaning medium

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Kirk-Othmer Encyclopedia of Chemical Technology, 3rd ed., vol. 4, p. 737 (month unknown), 1978. *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1618970A1 (en) * 2004-07-22 2006-01-25 Linde Aktiengesellschaft Carbon dioxide cleaning method
WO2006008035A1 (en) * 2004-07-22 2006-01-26 Linde Aktiengesellschaft Carbon dioxide cleaning method
US20080223406A1 (en) * 2004-07-22 2008-09-18 Linde Aktiengesellschaft Carbon Dioxide Cleaning Method
US20090305187A1 (en) * 2006-07-24 2009-12-10 Koninklijke Philips Electronics N.V. Liquid interdental cleaner
US8668493B2 (en) * 2006-07-24 2014-03-11 Koninklijke Philips N.V. Liquid interdental cleaner
US9091017B2 (en) 2012-01-17 2015-07-28 Co2Nexus, Inc. Barrier densified fluid cleaning system
US9752273B2 (en) 2012-01-17 2017-09-05 Co2Nexus, Inc. Barrier densified fluid cleaning system

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EP0732154B1 (en) 1999-06-16
US5759209A (en) 1998-06-02
DE19509573A1 (en) 1996-09-19
DE59602213D1 (en) 1999-07-22

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