WO1994012265A1 - Method and apparatus for preventing contamination of substrate or substrate surface - Google Patents
Method and apparatus for preventing contamination of substrate or substrate surface Download PDFInfo
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- WO1994012265A1 WO1994012265A1 PCT/JP1992/001579 JP9201579W WO9412265A1 WO 1994012265 A1 WO1994012265 A1 WO 1994012265A1 JP 9201579 W JP9201579 W JP 9201579W WO 9412265 A1 WO9412265 A1 WO 9412265A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
- B01D46/12—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces in multiple arrangements
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- 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
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- 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
- B01D53/0407—Constructional details of adsorbing systems
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- 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
- B01D53/26—Drying gases or vapours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
- F24F3/1411—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification by absorbing or adsorbing water, e.g. using an hygroscopic desiccant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/16—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by purification, e.g. by filtering; by sterilisation; by ozonisation
- F24F3/167—Clean rooms, i.e. enclosed spaces in which a uniform flow of filtered air is distributed
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- 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
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- 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
- B01D2253/102—Carbon
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- 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
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- 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
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- 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
- B01D2256/10—Nitrogen
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- 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
- B01D2257/11—Noble gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/702—Hydrocarbons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/80—Water
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0216—Other waste gases from CVD treatment or semi-conductor manufacturing
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- 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
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2267/00—Multiple filter elements specially adapted for separating dispersed particles from gases or vapours
- B01D2267/40—Different types of filters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
- B01D2279/50—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for air conditioning
- B01D2279/51—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for air conditioning in clean rooms, e.g. production facilities for electronic devices, laboratories
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- 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
- B01D53/0462—Temperature swing adsorption
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
- F24F2003/144—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification by dehumidification only
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
- F24F8/15—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means
- F24F8/158—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means using active carbon
Definitions
- the present invention relates to a method and an apparatus for preventing contamination of a substrate or a substrate surface in a space, and particularly to a method for preventing contamination of a substrate of a raw material, a semi-finished product, or a product in a high-tech industry such as semiconductor manufacturing and liquid crystal manufacturing. About.
- Fields of application of the present invention include, for example, (1) prevention of wafer contamination in a semiconductor manufacturing process, (2) prevention of glass substrate contamination in a liquid crystal manufacturing process, and (3) prevention of substrate contamination in a precision machine manufacturing process. is there.
- locations to which the contamination prevention method and apparatus of the present invention are applied include spaces in clean rooms such as semiconductor manufacturing factories, liquid crystal manufacturing factories, precision instrument manufacturing factories, such as safety cabinets, clean boxes, valuable storage, and wafers.
- Storage space closed transfer space for valuables, clean closed space under the presence of various gases or under reduced pressure or vacuum, transfer space, space containing gas to be supplied to the cleaning device, air supply for air knife Space, including. Background art
- the conventional technology will be described below by taking air purification in a clean room in a semiconductor manufacturing plant as an example.
- gaseous substances such as fine particles (particulate matter) and extremely low-concentration hydrocarbons (H C) other than methane in the air due to exhaust gas from automobiles, etc.
- H C extremely low-concentration hydrocarbons
- HC must be removed as a gaseous harmful component that has a very low concentration in normal air (indoor air and outside air), causing contamination.
- various solvents alcohols, ketones, etc. generated during clean room operations also pose a problem as pollutants.
- the contact angle refers to the contact angle of wetting with water, and indicates the degree of contamination of the substrate surface. That is, when a hydrophobic (oil-based) substance adheres to the substrate surface, the surface repels water and becomes less wettable. Then, the contact angle between the substrate surface and the water droplet increases. Therefore, a large contact angle results in a high degree of contamination, while a small contact angle results in a low degree of contamination. No.
- HEPA filters mechanical filtration methods
- electrostatically collecting fine particles and charging by high voltage.
- a filtration method using a conductive filter such as a HESA filter. Both of these methods are intended to remove particulates and are ineffective at removing gaseous pollutants that increase the contact angle, such as hydrocarbons (H C) other than methane.
- the present inventors have already proposed a method and an apparatus using an adsorbent / absorbent for preventing the increase in the contact angle as a method and an apparatus for preventing the contamination of the substrate or the substrate surface.
- an object of the present invention is to provide a method and an apparatus capable of effectively removing fine particles contained in air introduced into a clean room, gaseous harmful substances that increase the contact angle between the substrate and the substrate surface.
- a gas that comes into contact with a base material or a substrate is purified by a dust removing means and an adsorption and absorption or absorption means, and the concentration of fine particles in the gas is classified into Class 100.
- a dust removing means for removing fine particles in a gas which comes into contact with a base material or a substrate to a class of 1000 or less, and a non-methane hydrocarbon to a concentration of 0.2 ppm or less.
- Adsorption means and Z or absorption means for An apparatus is provided that comprises: BRIEF DESCRIPTION OF THE FIGURES
- FIG. 1 shows an apparatus of the present invention, which is an example applied to purification of supply air for an air knife in a semiconductor manufacturing plant.
- FIGS. 2, 3 and 4 are graphs showing the relationship between the exposure time of a glass substrate or a wafer to air and the measured contact angle S.
- the present invention will be described in detail by taking, as an example, a case where the gas contacting the substrate or the substrate surface is air.
- the dust removing means in the present invention may be any means as long as it can remove fine particles in the air to a low concentration.
- a well-known dust filter that efficiently collects fine particles to a low concentration is used.
- HEPA filters, U.LPA filters, and electrostatic filters are preferred because they are simple and effective.
- one or more of these filters are used in an appropriate combination.
- the fine particle concentration is reduced to class 1000 (1000 ft 3 ) or less, and preferably to class 100 or less.
- the class is a unit of particle concentration, and represents the number of particles in 1 ft 3 .
- Non-methane hydrocarbons cause pollution at concentrations in normal air (room air and outside air).
- the component that increases the contact angle is considered to differ depending on the type of substrate (eg, wafer and glass material) and the type and properties of the thin film on the substrate. As a result of intensive studies, the present inventor has found that it is effective to remove non-methane hydrocarbons as an index to 0.2 ppm or less, preferably 0.1 ppm or less.
- activated carbon silica gel, synthetic zeolite, molecular sieve, polymer compound (for example, styrene-based polymer, styrene-divinylbenzene copolymer), glass, fluorine compound, metal and the like are used.
- an oxide glass system for example, a gate glass or a phosphate glass is generally used.
- N20-B203-S1O2 is preferred because it is easy to mold, has a high adsorption effect, and is inexpensive. When the glass surface is coated with a metal thin film of Ti, Au, Al, Cr, etc., the adsorption effect is enhanced.
- the fluorine compound include tetrafluoride resin, tetra-hexafluoride resin, PFA resin, titanium trifluoride resin, tetrafluoroethylene-ethylene copolymer, vinylidene fluoride resin, vinyl fluoride resin, and graphite fluoride. , And Teflon.
- the shapes of glass and fluorine compounds used include filter, fiber, net, sphere, pellet, lattice, rod, and pleated.
- a filter shape is preferable because of its large adsorption effect.
- a forming method in the case of using a filter there is a method in which a fluorine compound resin is used as a binder and a fibrous glass material is solidified into a filter.
- the dust removal performance is added to the HC removal performance, so that the filter configuration is simplified. Therefore, incorporating such an adsorbent into a pollution control device is preferable depending on the field of use, the scale of the device, and the shape of the device.
- the metal examples include Fe, Ag, Ni, Cr, Ti, Au, and Pt.Powder, plate, sponge, wire, fiber, or those added to an appropriate carrier, such as For example, a silica-alumina gel supporting Ag and a zirconium phosphate supporting Ag can be suitably used.
- silica gel, synthetic zeolite, polymer compound, glass, fluorine compound, and metal are more preferable because of their high adsorption effect.
- These adsorbents can be used alone or in combination of two or more as appropriate (see Japanese Patent Application Nos. 3-341802 and 4-180580).
- the degree of the influence of the H-edge varies depending on the type of glass substrate or the surface condition of the substrate.
- dehydration, dehumidification or dehumidification of the air to be treated before passing air through the adsorbent can improve the adsorbent's adsorption performance and extend its life.
- a well-known system such as a cooling system, an adsorption system, an absorption system, a compression system, and a system using membrane separation can be used.
- the application field, scale, shape, and usage conditions of the apparatus of the present invention (for example, Perform preliminary tests as appropriate under atmospheric pressure or under pressure, etc., and use one or more of them as appropriate.
- the dehumidification method used is one that maintains stable dehumidification performance for a long period of time, usually several months to six months or more.
- cooling type and Z or adsorption type are simple and effective.
- the cooling type is preferably an electronic dehumidifying type or a cooling coil type
- the adsorption type is a type (fixed type, rotary type, etc.) that continuously dehumidifies for a long time while performing dehumidification and regeneration of the dehumidifier itself.
- Silica gel, zeolite, activated carbon, activated alumina, magnesium perchlorate, calcium chloride, and the like can be used as the dehumidifying material by the adsorption method. Of these, silica gel and zeolite are preferred because they have an HC removing effect, can be recycled, and can be used for a long time.
- the adsorbent's HC adsorption performance is improved, and the performance is stable for a long time. Will be maintained.
- the dehumidification method and critical moisture concentration can be determined by appropriate preliminary tests depending on the type and scale of the applied equipment, the type of HC removal material, the required performance, and economic efficiency.
- the HC removal performance of the adsorbent is stably maintained for a long time. Especially when a hydrophobic substance such as silica gel / fluorine compound is used as the adsorbent, the performance is remarkably stabilized.
- the amount of dehumidification is small or when the moisture concentration of the gas to be treated is low, the dehumidification can be omitted. In other words, dehumidification can be determined by conducting appropriate preliminary tests depending on the type of adsorbent, the field of application of the equipment, the concentration of water in the gas to be treated, the scale, shape, required performance, and economics of the applied equipment.
- PSA pressure swing adsorption
- TSA thermo swing adsorption
- the HC absorbent can be used as long as it reacts with low-concentration HC and can fix it.
- the former is effective for low molecular weight HC
- the latter is effective for high molecular weight HC.
- a salt aqueous solution containing hexavalent chromium H 2 S0 4 acidic carrier surface such Zeorai bets Ya alumina glass beads or suitable Yichun shape (e.g. Perez preparative shape).
- the term “absorption” refers to absorption by chemical reaction.
- the conditions for using the adsorbent and / or the absorbent can be determined by appropriate preliminary tests depending on the application field of the apparatus of the present invention, the scale of the apparatus, the shape, the required performance, and the like.
- the space velocity (SV) of the air to be treated in the apparatus is usually 100 to 20000 (h- 1 ), preferably 100 to 5000 (h- 1 ).
- activated carbon an activated carbon to which an acid, an alkali, or the like has been impregnated, or that has been appropriately modified by a known method can be used.
- the method proposed by the present inventor which has been proposed by the present inventors to form HC into fine particles by irradiation with ultraviolet rays or radiation (Japanese Patent Application No. 3-105092), can also be used. .
- FIG. 1 is an example in which the method of the present invention is applied to purification of supply air for an air knife in a semiconductor manufacturing plant.
- reference numeral 1 denotes a clean room of class 10000, in which air 2 contains a dehumidifier 3, an adsorbent 4 that adsorbs gaseous harmful components (in this example, mainly HC) that increase the contact angle, and a dust filter 5 It is treated in the clean room 1 by a pollution control device 6. After passing through the device 6, the air 7 is clean air from which dust is removed and gaseous harmful components are removed, and is supplied to an air knife device 8 for cleaning a wafer (substrate).
- a pollution control device 6 After passing through the device 6, the air 7 is clean air from which dust is removed and gaseous harmful components are removed, and is supplied to an air knife device 8 for cleaning a wafer (substrate).
- the outside air 9 before entering the clean room 1 is first processed by the coarse filter 10 and the air conditioner 11.
- the air is removed by the HEPA filter 12, and becomes air 13 having a concentration of 10000 in the class in which extremely low concentration HC is present.
- extremely low-concentration HC mainly generated from automobiles is not removed by the coarse filter 10, the air conditioner 11, and the HEPA filter 12, and is introduced into the clean room 1.
- the concentration of HC in air 13 is 0.5 to 0.8 ppm of non-methane HC.
- the air 2 in the clean room 1 containing moisture (RH 40 to 60%), fine particles (class 1000), and extremely low concentration of HC is first dehumidified by a dehumidifier (dehumidifier) 3. It is dehumidified so as to be below a certain concentration.
- the dehumidifier of this example is based on the electronic dehumidification method, and is operated so that the humidity (RH 40 to 60%) in the clean room 1 becomes 30% or less.
- the dehumidified air is then processed by an H 2 C adsorbent, that is, a gas adsorption and removal device 4, thereby removing an extremely low concentration of HC.
- the H C adsorbent 4 may be any material that removes an extremely low concentration of H C which is usually present in the atmosphere.
- silica gel is used as the adsorbent 4. This removes non-methane HC in the air to a concentration of 0.1 ppm. If the moisture in the introduced air 2 is high, the silica gel also absorbs the moisture and the performance deteriorates. Therefore, the moisture is removed in advance by the dehumidifier 3 as described above.
- the position of the dust removing filter 5 can be on the upstream side of the HC adsorbent 4, on the downstream side of the HC adsorbent as in this example, or on both the upstream side and the downstream side. However, assuming the case where fine particles flow out from the adsorbent 4, it is usually preferable to install at least one of them downstream as in this example for safety.
- the dust filter 5 may be of any type as long as it can efficiently collect fine particles having a concentration of class 1000 in the clean room and fine particles flowing out of the adsorbent.
- an ULPA filter is used. The ULPA filter removes particles down to class 10 or lower.
- the removal of HC is performed by an adsorbent, but an absorbent (a reactant with an extremely low concentration of HC) may be used instead of the adsorbent.
- an absorbent a reactant with an extremely low concentration of HC
- the adsorbent and the absorbent may be used at the same time.
- the positions of the dust filter and the adsorbent relative to the dehumidifier in the above embodiment are not particularly limited as long as the purpose of performing the dehumidification in advance for removing HC is achieved.
- the combination of the method (apparatus) already proposed by the present inventor with the method of the present invention, and the use and combination of materials for removing harmful gases other than HC can be appropriately selected and used.
- the conditions for using the dust filter, the adsorbent and / or the absorbent can be determined as appropriate. In other words, these are appropriately determined according to the concentration and type of contaminants (fine particles, HC, and other harmful gases) in the clean room used, the type of applied equipment, structure, scale, required performance, efficiency, economy, etc. It can be determined by conducting preliminary tests.
- the space to which the present invention can be applied refers to, besides the above-mentioned atmospheric pressure, under a pressurized condition, under a reduced pressure, and under a vacuum.
- the HC component in the air is said to be a mixture of hundreds or thousands or more components, and it is not clear which of these various HC components contributes to the increase in contact angle and to what extent. is there. For this reason, there are many unclear points about the mechanism to prevent the increase of the contact angle due to the adsorbent and / or the absorbent, but the following is considered. In other words, it is presumed that the increase in the contact angle is largely affected by the substances with particularly high molecular weight and high activity among the HC components, and these are effectively adsorbed and collected by the adsorbent / absorbent. .
- Fine particle concentration in clean room before treatment Class 10000
- Non-medium HC concentration in clean room before treatment 0.51 ppm
- Dehumidifier Electronic dehumidifier (Peltier effect method) (Shinei Sangyo Co., Ltd.)
- Dust removal Filter ULPA (Nippon Pall Co., Ltd. Gas Clean Filter)
- HC adsorbent Silica gel (medium, SV: 100 Oh " 1 )
- Figure 2 shows the relationship between the exposure time of the glass substrate to air and the measured contact angle of 0.
- the present invention (A) dehumidifier, dust filter, silica gel Is shown by- ⁇
- that of the present invention (A) with the dehumidifier removed (B) is shown by 1 O-.
- those exposed to air before treatment in a clean room (Ichiichi) those exposed to air passed only through a dust filter (I ⁇ 1), and those exposed only to HC adsorbents Things ( ⁇ ⁇ ⁇ ) are also shown.
- the frequency at which the contact angle meter used to detect the contact angle (the lower limit of contact angle detection) is 3 to 4 degrees.
- the detection limit ( ) showed that.
- the concentration of fine particles at the outlet of the device was less than class 10 (measuring device: light scattering type particle counter), and the concentration of non-methane HC was less than 0.1 ppm (measuring device: gas chromatograph).
- the moisture concentration at the outlet of the dehumidifier was 25-30%.
- Synthetic zeolite, polymer compound (styrene-based polymer), fluorine powder, and fluorinated graphite were used as the adsorbent, and the other conditions were the same as in the case of the present invention (A) in Example 1; The contact angle after 100 hours was measured. Table 1 shows the results.
- Moisture, fine particles and H 2 C were removed from the air (containing 10 to 50 ppm of NOx and SOx) in the clean room, which had been washed with acid using nitric acid and sulfuric acid.
- the wafer was exposed to the resulting clean air and the contact angle was measured.
- the concentration of fine particles and the concentration of non-methane HC were measured.
- the water concentration at the outlet of the dehumidifier was also measured. The same measurement was performed when the wafer was exposed to air before processing in a clean room.
- Adsorbent (1) Silica gel (for HC adsorption) (medium size, SV: lOOOh- 1 )
- Moisture meter Electronic humidity sensor
- FIG. 3 shows the relationship between the exposure time of the wafer to air and the measured contact angle of 0.
- the thing (C) of the present invention (using a dehumidifier, a dust filter, and an adsorbent (2)) is shown in a one-to-one manner, and the one obtained by removing the dehumidifier from (C) of the present invention (D ) Is indicated by 1-, and that of the present invention (E) (using a dehumidifier, a dust filter, and an adsorbent (1)) is indicated by 1 ⁇ .
- the results of exposure to air before treatment in a clean room are indicated by "-".
- the concentration of fine particles at the outlet of the device was less than class 10 and the concentration of non-methane HC was less than 0.1 ppm.
- the water concentration at the outlet of the dehumidifier was 30-35%.
- Moisture, fine particles and HC were removed from the air in the clean room by the equipment shown in Fig. 1 (however, the following dust filter and adsorbent were used).
- the glass substrate was exposed to the clean air thus obtained, and the contact angle was measured.
- the concentration of fine particles and the concentration of non-methane HC were measured.
- the water concentration at the outlet of the dehumidifier was also measured. The same measurement was performed for the case where the dehumidifier was removed from the device shown in Fig. 1 and the case where the glass substrate was exposed to air before treatment in a clean room.
- HC Adsorbent Silica gel (medium particle, SV: l OOOh “ 1 ) (Wako Pure Chemical Industries, Ltd.)
- Contact angle measuring device CA-D type contact angle meter, manufactured by Kyowa Interface Science Co., Ltd.
- Moisture meter Electronic humidity sensor
- Figure 4 shows the relationship between the exposure time of the glass substrate to air and the measured contact angle of 0.
- the (F) of the present invention (using a dehumidifier, a dust filter, and an HC adsorbent) is indicated by - ⁇
- the (G) in which the dehumidifier is removed from the (F) of the present invention is shown. Indicated by ⁇ -.
- those exposed to air before treatment in a clean room are indicated by Hataichi.
- the concentration of fine particles at the outlet of the device was less than Class 10 and the concentration of non-methane HC was less than 0.1 lpm.
- the water concentration at the outlet of the dehumidifier was 25 to 30%.
- a clean gas can be obtained by removing fine particles in a gas and adsorbing and Z or absorbing a hydrocarbon by the method of the present invention. If this cleaning gas is exposed on a substrate or substrate such as a semiconductor or a liquid crystal, contamination of the substrate and the surface of the substrate is prevented.
- the concentration of gaseous harmful components such as NOx and SOx other than hydrocarbons in the gas to be treated is high, a method for removing these harmful components (for example, the method already proposed by the present inventors) should be selected as appropriate.
- contamination c further more is prevented when so effectively, in order to remove hydrocarbons, dehumidified air to be treated.
- the performance of removing hydrocarbons by the adsorbent is stably maintained over a long period of time. As a result, the frequency of replacement of the adsorbent is reduced, and the practicality is improved.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Separation Of Gases By Adsorption (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Treating Waste Gases (AREA)
- Drying Of Gases (AREA)
- Cleaning Or Drying Semiconductors (AREA)
- Central Air Conditioning (AREA)
Description
Claims
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69224917T DE69224917T2 (de) | 1992-12-02 | 1992-12-02 | Methode und vorrichtung zur verhinderung von kontamination eines substrates oder einer substratoberfläche |
PCT/JP1992/001579 WO1994012265A1 (en) | 1992-12-02 | 1992-12-02 | Method and apparatus for preventing contamination of substrate or substrate surface |
US08/424,545 US6733570B2 (en) | 1992-12-02 | 1992-12-02 | Method and apparatus for the preparation of clean gases |
JP51296194A JP3320730B2 (ja) | 1992-12-02 | 1992-12-02 | 清浄気体の調製方法および調製装置 |
EP92924872A EP0672445B1 (en) | 1992-12-02 | 1992-12-02 | Method and apparatus for preventing contamination of substrate or substrate surface |
US09/044,235 US5922105A (en) | 1992-12-02 | 1998-03-19 | Method and apparatus for the preparation of clean gases |
US09/620,247 US6340381B1 (en) | 1991-12-02 | 2000-07-20 | Method and apparatus for the preparation of clean gases |
US10/746,278 US6911064B2 (en) | 1992-12-02 | 2003-12-29 | Method and apparatus for the preparation of clean gases |
US11/079,252 US7029518B2 (en) | 1992-12-02 | 2005-03-15 | Method and apparatus for the preparation of clean gases |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP1992/001579 WO1994012265A1 (en) | 1992-12-02 | 1992-12-02 | Method and apparatus for preventing contamination of substrate or substrate surface |
Related Child Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08424545 A-371-Of-International | 1992-12-02 | ||
US09/620,247 Continuation US6340381B1 (en) | 1991-12-02 | 2000-07-20 | Method and apparatus for the preparation of clean gases |
US10/746,278 Continuation US6911064B2 (en) | 1992-12-02 | 2003-12-29 | Method and apparatus for the preparation of clean gases |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994012265A1 true WO1994012265A1 (en) | 1994-06-09 |
Family
ID=14042686
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1992/001579 WO1994012265A1 (en) | 1991-12-02 | 1992-12-02 | Method and apparatus for preventing contamination of substrate or substrate surface |
Country Status (5)
Country | Link |
---|---|
US (3) | US6733570B2 (ja) |
EP (1) | EP0672445B1 (ja) |
JP (1) | JP3320730B2 (ja) |
DE (1) | DE69224917T2 (ja) |
WO (1) | WO1994012265A1 (ja) |
Cited By (2)
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JP2009030974A (ja) * | 2008-11-12 | 2009-02-12 | National Institute Of Advanced Industrial & Technology | 小型デシカント空調装置 |
CN105381694A (zh) * | 2015-12-07 | 2016-03-09 | 兴边富民(北京)清洁能源技术有限公司 | 一种煤矿乏风及抽放瓦斯的掺混处理系统 |
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US6733570B2 (en) * | 1992-12-02 | 2004-05-11 | Ebara Research Co., Ltd. | Method and apparatus for the preparation of clean gases |
JP3519212B2 (ja) * | 1995-06-13 | 2004-04-12 | 高砂熱学工業株式会社 | 清浄な資材用保管庫 |
US6620385B2 (en) * | 1996-08-20 | 2003-09-16 | Ebara Corporation | Method and apparatus for purifying a gas containing contaminants |
US7361206B1 (en) * | 2004-09-07 | 2008-04-22 | United States Of America As Represented By The Secretary Of The Navy | Apparatus and method for water vapor removal in an ion mobility spectrometer |
JP3879762B2 (ja) * | 2005-03-29 | 2007-02-14 | ダイキン工業株式会社 | 調湿装置 |
US8783099B2 (en) * | 2011-07-01 | 2014-07-22 | Baker Hughes Incorporated | Downhole sensors impregnated with hydrophobic material, tools including same, and related methods |
CN106794441B (zh) * | 2014-10-17 | 2022-06-21 | 香港科技大学 | 用于从空气中湿气去除和水富集的材料 |
JP2019536611A (ja) | 2016-10-07 | 2019-12-19 | ハルドール・トプサー・アクチエゼルスカベット | オゾンを用いた低温ガス洗浄方法及びこの方法で使用するための触媒作用バッグフィルタ |
KR102539338B1 (ko) * | 2017-09-14 | 2023-06-02 | 가부시키가이샤 세이부 기켄 | 가스 치환용 드라이룸 |
CN113967393A (zh) * | 2020-07-24 | 2022-01-25 | 惠亚科技(东台)有限公司 | 改良型隔离病房结构 |
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- 1992-12-02 DE DE69224917T patent/DE69224917T2/de not_active Expired - Fee Related
- 1992-12-02 JP JP51296194A patent/JP3320730B2/ja not_active Expired - Lifetime
- 1992-12-02 WO PCT/JP1992/001579 patent/WO1994012265A1/ja active IP Right Grant
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009030974A (ja) * | 2008-11-12 | 2009-02-12 | National Institute Of Advanced Industrial & Technology | 小型デシカント空調装置 |
CN105381694A (zh) * | 2015-12-07 | 2016-03-09 | 兴边富民(北京)清洁能源技术有限公司 | 一种煤矿乏风及抽放瓦斯的掺混处理系统 |
Also Published As
Publication number | Publication date |
---|---|
DE69224917T2 (de) | 1998-10-22 |
EP0672445A4 (en) | 1996-09-11 |
EP0672445B1 (en) | 1998-03-25 |
US7029518B2 (en) | 2006-04-18 |
US20050178267A1 (en) | 2005-08-18 |
EP0672445A1 (en) | 1995-09-20 |
US20030089231A1 (en) | 2003-05-15 |
JP3320730B2 (ja) | 2002-09-03 |
DE69224917D1 (de) | 1998-04-30 |
US20040149128A1 (en) | 2004-08-05 |
US6733570B2 (en) | 2004-05-11 |
US6911064B2 (en) | 2005-06-28 |
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