WO2010113863A1 - ガス溶解水供給装置及びガス溶解水の製造方法 - Google Patents
ガス溶解水供給装置及びガス溶解水の製造方法 Download PDFInfo
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- WO2010113863A1 WO2010113863A1 PCT/JP2010/055551 JP2010055551W WO2010113863A1 WO 2010113863 A1 WO2010113863 A1 WO 2010113863A1 JP 2010055551 W JP2010055551 W JP 2010055551W WO 2010113863 A1 WO2010113863 A1 WO 2010113863A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2312—Diffusers
- B01F23/23124—Diffusers consisting of flexible porous or perforated material, e.g. fabric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/21—Measuring
- B01F35/2132—Concentration, pH, pOH, p(ION) or oxygen-demand
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/22—Control or regulation
- B01F35/221—Control or regulation of operational parameters, e.g. level of material in the mixer, temperature or pressure
- B01F35/2211—Amount of delivered fluid during a period
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/80—Forming a predetermined ratio of the substances to be mixed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/58—Mixing semiconducting materials, e.g. during semiconductor or wafer manufacturing processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2312—Diffusers
- B01F23/23124—Diffusers consisting of flexible porous or perforated material, e.g. fabric
- B01F23/231244—Dissolving, hollow fiber membranes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/0318—Processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8158—With indicator, register, recorder, alarm or inspection means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/85978—With pump
- Y10T137/86083—Vacuum pump
Definitions
- the present invention relates to a gas-dissolved water supply device and a method for producing gas-dissolved water.
- the present invention has a gas-permeable membrane module partitioned into a gas phase chamber and a liquid phase chamber by a gas permeable membrane, and the liquid phase chamber is covered with the gas-permeable membrane module.
- Treated water is passed and gas is supplied to the gas phase chamber, and the gas is dissolved from the gas phase chamber through the gas permeable membrane into the water to be treated in the liquid phase chamber.
- the present invention relates to a gas-dissolved water supply device that uses gas-dissolved water and a method for producing gas-dissolved water using the gas-dissolved water supply device.
- cleaning of a silicon substrate for a semiconductor, a glass substrate for a liquid crystal, etc. has mainly been performed by a mixed solution of hydrogen peroxide solution and sulfuric acid, a mixed solution of hydrogen peroxide solution, hydrochloric acid and water, hydrogen peroxide solution, ammonia solution and water.
- This is performed by a so-called RCA cleaning method in which a concentrated chemical solution based on hydrogen peroxide, such as a mixed solution, is washed at a high temperature and then rinsed with ultrapure water.
- this RCA cleaning method uses a large amount of hydrogen peroxide water, high-concentration acid, alkali, etc., so the cost of the chemical solution is high, and the cost of rinsing ultrapure water, the cost of waste liquid treatment, and chemical vapor are exhausted.
- a large cost is required, such as an air conditioning cost for newly preparing clean air.
- a typical example is a technique for cleaning an object to be processed by ultrasonic cleaning or the like using gas-dissolved water in which a specific gas is dissolved.
- a specific gas oxygen gas, ozone, carbon dioxide gas, rare gas, inert gas, hydrogen gas, or the like is used.
- Japanese Patent Application Laid-Open No. 11-077023 describes that after degassing ultrapure water to lower the saturation of dissolved gas, hydrogen gas is dissolved in this ultrapure water.
- FIG. 2 is a process flow diagram of the same publication.
- the ultrapure water is sent to the deaeration membrane module 2 via the flow meter 1.
- the degassing membrane module 2 the gas phase in contact with the ultrapure water through the gas permeable membrane is kept in a reduced pressure state by the vacuum pump 3, and the gas dissolved in the ultrapure water is degassed.
- the ultrapure water from which the dissolved gas has been degassed is then sent to the hydrogen gas dissolving membrane module 4.
- the hydrogen gas supplied from the hydrogen gas supplier 5 is sent to the gas phase side and supplied to ultrapure water through the gas permeable membrane.
- a chemical solution such as ammonia water is added from the chemical solution storage tank 6 to the ultrapure water in which the dissolved hydrogen gas concentration has reached a predetermined value by the chemical injection pump 7 and adjusted to a predetermined pH value.
- the hydrogen-containing ultrapure water that has become alkaline due to the dissolution of hydrogen gas is finally sent to the microfiltration device 8 and fine particles are removed by an MF filter or the like.
- the dissolved gas measurement sensors 9 installed at the inlet and outlet of the degassing membrane module 2 measure the amount of gas in the ultrapure water to determine the saturation, and send a signal to the vacuum pump to determine the saturation and the desired purity of the ultrapure water.
- the amount of deaeration is adjusted by comparing the degree of saturation.
- the deaeration amount is adjusted, for example, by adjusting the degree of vacuum by the vacuum pump by adjusting the degree of opening of the vacuum degree adjusting valve.
- the gas saturation of the ultrapure water after deaeration is measured by the dissolved gas measuring sensor 9, and the hydrogen gas concentration in the hydrogen-containing ultrapure water flowing out from the hydrogen gas dissolving membrane module is measured by the dissolved hydrogen measuring sensor 9A.
- These measurement signals are sent to a hydrogen gas supply device, and the supply amount of hydrogen gas is controlled by adjusting, for example, the opening degree of a valve provided in the hydrogen gas supply path.
- the gas permeable membrane of the hydrogen gas dissolving membrane module 4 has a characteristic of allowing only gas to pass and not allowing liquid to pass through, and water vapor passes through this gas permeable membrane. For this reason, water vapor diffuses from the liquid phase chamber to the gas phase chamber through the gas permeable membrane, dew condensation in the gas phase chamber becomes condensed water, and accumulates in the gas phase chamber.
- the degassing level of raw water (degassing membrane module 2 in FIG. 2). If the degree of degassing due to (2) is high, the condensed water tends to accumulate in the gas phase chamber of the gas dissolving membrane module (hydrogen gas dissolving membrane module 4 in FIG. 2) and the influence of the condensed water cannot be ignored. As in the case of producing the gas-dissolved water, it was difficult to stabilize the dissolved gas concentration in the gas-dissolved water.
- An object of the present invention is to provide a gas-dissolved water supply apparatus and a gas-dissolved water production method capable of stably supplying gas-dissolved water having a low dissolved gas concentration (low saturation). .
- the gas-dissolved water supply apparatus includes a gas permeable membrane module partitioned into a gas phase chamber and a liquid phase chamber by a gas permeable membrane, and allows water to be treated to flow into the liquid phase chamber by water passing means.
- the gas supply means supplies gas to the gas phase chamber, and the gas is dissolved in the water to be processed in the liquid phase chamber from the gas phase chamber through the gas permeable membrane.
- the vacuum exhaust means is provided so as to supply the gas into the gas phase chamber by the gas supply means while evacuating the gas phase chamber by the vacuum exhaust means. It is characterized by that.
- the gas-dissolved water supply device is the first aspect, wherein the dissolved gas concentration measuring means for measuring the dissolved gas concentration of the gas-dissolved water and the supply amount of the gas from the gas supplying means according to the measurement value of the measuring means And control means for controlling the dissolved gas concentration by adjusting.
- the gas-dissolved water supply device of the third aspect is characterized in that, in the first or second aspect, a connection port with the vacuum evacuation means is provided below the gas phase chamber.
- the gas-dissolved water supply device of the fourth aspect is characterized in that, in any one of the first to third aspects, the gas contains oxygen.
- the gas-dissolved water supply device is characterized in that, in the fourth aspect, the dissolved gas concentration of the gas-dissolved water is 1/400 or less of the solubility of the gas.
- the gas-dissolved water supply device of the sixth aspect is characterized in that, in any one of the first to third aspects, the gas contains carbon dioxide gas.
- the gas-dissolved water supply device is characterized in that, in the sixth aspect, the dissolved gas concentration of the gas-dissolved water is 1/50 or less of the solubility of the gas.
- the gas-dissolved water supply apparatus is characterized in that, in any one of the first to third aspects, the gas includes at least one of nitrogen, argon, ozone, hydrogen, clean air, and a rare gas. .
- a method for producing gas-dissolved water according to a ninth aspect is a method for producing gas-dissolved water using the gas-dissolved water supply device according to any one of the first to eighth aspects, wherein water to be treated is disposed in the liquid phase chamber.
- the gas is supplied to the gas phase chamber while evacuating the gas phase chamber, and the gas is supplied from the gas phase chamber to the treated water in the liquid phase chamber through the gas permeable membrane. By dissolving, the water to be treated is gas-dissolved water.
- the gas is supplied into the gas phase chamber by the gas supply means while the gas chamber is evacuated by the vacuum exhaust means.
- the gas supply means is supplied into the gas phase chamber by the gas supply means while the gas chamber is evacuated by the vacuum exhaust means.
- the present invention can be used for a gas-dissolved water supply device that stably supplies low-concentration gas-dissolved water and a method for producing gas-dissolved water. Especially for the production of low concentration gas dissolved water with strictly controlled dissolved gas concentration and ultrapure water with strictly controlled dissolved gas concentration, which are used in cleaning processes in the semiconductor industry. It is suitable for application to a gas-dissolved water supply device and a method for producing gas-dissolved water.
- the dissolved gas concentration is measured by adjusting the dissolved gas concentration of the gas dissolved water, and adjusting the supply amount of the gas from the gas supply unit according to the measurement value of the measurement unit. It is preferable to have control means for controlling. By such feedback control, it is possible to supply gas-dissolved water having a stable dissolved gas concentration even in a low concentration region (low saturation region).
- connection port with the vacuum exhaust means is provided at the lower part of the gas phase chamber, the condensed water accumulated in the gas phase chamber can be efficiently discharged.
- the gas may contain oxygen.
- the dissolved gas concentration of the gas-dissolved water is preferably 1/400 or less of the solubility of the gas.
- the gas may contain carbon dioxide gas.
- the dissolved gas concentration of the gas-dissolved water is preferably 1/50 or less of the solubility of the gas.
- the gas may include at least one of nitrogen, argon, ozone, hydrogen, clean air, and a rare gas.
- FIG. 1 is a system diagram for explaining a gas-dissolved water supply device and a method for producing gas-dissolved water according to an embodiment.
- the raw water pipe 21 is connected to the lower part of the liquid phase chamber 11 of the gas permeable membrane module 10.
- the gas permeable membrane module 10 is partitioned into the liquid phase chamber 12 and the gas phase chamber 13 by a gas permeable membrane 11.
- a gas-dissolved water supply pipe 22 equipped with a dissolved gas concentration meter 23 is connected to the upper part of the liquid phase chamber 12.
- One end of a gas supply pipe 31 having a gas flow rate control valve 32 is connected to the upper part of the vapor phase chamber 13.
- the other end of the gas supply pipe 31 is connected to a gas source such as a gas cylinder.
- An exhaust pipe 33 including a pressure gauge 34 and a vacuum pump 35 is connected to the lower part of the gas phase chamber 13.
- the detection signal of the dissolved gas concentration meter 23 is input to the control device 24.
- the control device 24 controls the gas flow rate control valve 32 so that the detected concentration of the dissolved gas concentration meter 23 becomes the target concentration.
- the target gas is dissolved in the raw water passed through the raw water pipe 21 to produce a low-concentration (low saturation) gas-dissolved water.
- the target gas to be dissolved is almost not dissolved and is not saturated with a gas other than the target gas, and the target gas can be dissolved without being oversaturated. It is preferable.
- deaerated water obtained by sufficiently degassing dissolved gas from ultrapure water or the like can be used.
- the deaeration can be performed using, for example, the deaeration membrane module 2 shown in FIG.
- the gas permeable membrane 10 is not particularly limited as long as it does not permeate water and permeates gas dissolved in water.
- polypropylene, polydimethylsiloxane, polycarbonate-polydimethylsiloxane block copolymer examples thereof include a polymer film such as polyvinylphenol-polydimethylsiloxane-polysulfone block copolymer, poly (4-methylpentene-1), poly (2,6-dimethylphenylene oxide), and polytetrafluoroethylene.
- the vacuum pump 35 is not limited, and a water seal type or a scroll type is used. However, those using oil for generating the vacuum are preferably oil-less because the oil may diffuse back and contaminate the gas permeable membrane 11.
- oxygen, carbon dioxide, nitrogen, argon, ozone, hydrogen, clean air, a mixed gas of two or more of these gases, and the like are used.
- these gases may be diluted with a diluent gas.
- a rare gas such as argon or helium
- an inert gas such as nitrogen, carbon dioxide gas, clean air, or a mixed gas of two or more of these gases is used.
- the gas flow control valve 32 is preferably oilless.
- oxygen is used as the gas and the water temperature is 25 ° C.
- the solubility of oxygen in water at 25 ° C. and 1 atm is 40.9 mg / L.
- gas flow control valve 32 By opening the gas flow control valve 32, oxygen gas is supplied from the gas supply pipe 31 into the gas phase chamber 13, and the vacuum pump 35 is operated to evacuate the gas phase chamber 13 through the exhaust pipe 33. Exhaust. Further, raw water is supplied from the raw water pipe 21 into the liquid phase chamber 12.
- the degree of vacuum in the gas phase chamber 13 needs to be higher than the degree of deaeration of raw water.
- a part of the gas (oxygen) in the gas phase chamber 13 is dissolved in the raw water in the liquid phase chamber 12 through the gas permeable membrane 11.
- the pressure in the gas phase chamber 13 is preferably ⁇ 90 kPa or less, more preferably ⁇ 90 to ⁇ 97 kPa, and particularly preferably ⁇ 93 to ⁇ 96 kPa. When it is ⁇ 90 kPa or less, the condensed water in the gas phase 13 can be discharged well.
- a part of oxygen supplied from the gas supply pipe 31 into the gas phase chamber 13 passes through the gas permeable membrane 11 as described above and is dissolved in the raw water in the liquid phase chamber 12.
- the gas dissolved water thus obtained flows out from the gas dissolved water supply pipe 22.
- the remainder of the oxygen supplied into the gas phase chamber 13 is sucked by the vacuum pump 35 together with water vapor that has passed through the gas permeable membrane 11 from the liquid phase chamber 12 side and condensed water formed by condensation of the water vapor.
- the gas is discharged from the exhaust pipe 33.
- the dissolved gas concentration in the gas-dissolved water supply pipe 22 is measured by a dissolved gas concentration meter 23 and a measurement signal is input to the control device 24.
- the control device 24 controls the gas flow rate by adjusting the opening of the gas flow control valve 32 so that the dissolved oxygen concentration of the dissolved gas concentration meter 23 becomes a target value (or target range). By this feedback control, gas-dissolved water having a desired dissolved gas concentration is produced.
- the dissolved oxygen concentration in the gas-dissolved water is determined as appropriate according to the use of the gas-dissolved water. For example, when used as a low-concentration oxygen-dissolved water (cleaning water) in a cleaning process in the semiconductor industry field.
- the dissolved oxygen concentration is preferably about 1 to 100 ⁇ g / L, particularly about 10 to 60 ⁇ g / L.
- the flow rate of raw water in the raw water pipe 21 is, for example, about 2 to 10 L / min, and the flow rate of oxygen in the gas supply pipe 31 is, for example, about 0.1 to 10 mL / min.
- the condensed water in the gas phase chamber 13 is discharged by the vacuum pump 35, the condensed water is prevented from accumulating in the gas phase chamber 13. Therefore, the dissolved gas concentration fluctuation caused by the pressure fluctuation in the gas phase chamber 13 generated when the condensed water accumulated in the gas phase chamber 13 is discharged, or the condensed water in the gas phase chamber 13 is gasified. Variations in the dissolved gas concentration of the gas-dissolved water due to the partial penetration of the permeable membrane 12 are prevented.
- the drain pipe 33 is connected to the lower part of the gas phase chamber 13, it is possible to sufficiently prevent the condensed water from accumulating in the gas phase chamber 13.
- the dissolved gas concentration in which the dissolved gas concentration is in the low concentration region or the low saturation region can be stably produced by feedback control.
- the above embodiment is an example of the present invention, and the present invention is not limited to the above embodiment.
- the gas is not limited to oxygen.
- carbon dioxide may be dissolved in raw water instead of oxygen.
- the dissolved carbon dioxide concentration is preferably about 1 to 100 mg / L, particularly about 10 to 60 mg / L.
- the dissolved gas concentration is preferably 1 to 50 ⁇ g / L, particularly 5 to 30 ⁇ g / L.
- the dissolved gas concentration is preferably 1 to 100 ⁇ g / L, particularly 10 to 60 ⁇ g / L.
- the dissolved gas concentration is preferably 10 to 1000 ⁇ g / L, particularly 50 to 500 ⁇ g / L.
- the dissolved gas concentration is preferably 5 to 500 ⁇ g / L, particularly 10 to 100 ⁇ g / L.
- the dissolved gas concentration is preferably about 1 to 50 ⁇ g / L, particularly about 5 to 30 ⁇ g / L.
- the apparatus of FIG. 1 was used as a gas dissolved water supply apparatus.
- the specifications and operating conditions of the gas permeable membrane module 10 and the dissolved gas concentration meter 23 are as follows.
- Gas permeable membrane module Gas dissolving membrane manufactured by Celgard (trade name: Liquicell) Dissolved gas concentration meter: Dissolved oxygen meter manufactured byhack Ultra Analytics Japan, model 3610 Volume of raw water delivered: 5L / min Required dissolved oxygen concentration: 5 ⁇ g / L Water temperature: 25 ° C
- Example 1 The amount of oxygen gas supplied from the gas supply pipe 31 was controlled to 0.5 mL (standard state) / min by the gas flow rate control valve 32. Further, the gas phase chamber 13 was evacuated by the vacuum pump 35 so that the pressure in the gas phase chamber 13 became ⁇ 97 kPa.
- the dissolved oxygen concentration in the obtained oxygen-dissolved water was continuously controlled to 5 ⁇ g / L ⁇ 5% or less. Further, the condensed water does not accumulate in the gas phase chamber 13, and there is no need to separately perform the condensed water discharge operation.
- Comparative Example 1 In the first embodiment, the vacuum pump 35 is normally stopped and the gas phase chamber 13 is not evacuated. When the condensed water accumulates in the gas phase chamber 13, the vacuum pump 35 is operated to condense water. Oxygen-dissolved water was produced in the same manner except that the discharging operation was performed.
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Abstract
Description
溶存ガス濃度計:ハックウルトラアナリティクスジャパン社製溶存酸素計、モデル3610
原水の送水量:5L/min
要求溶存酸素濃度:5μg/L
水温:25℃
ガス流量制御弁32により、ガス供給配管31から供給する酸素ガス量を0.5mL(標準状態)/minに制御した。また、気相室13内の圧力が-97kPaとなるように真空ポンプ35で気相室13内を真空排気した。
実施例1において、通常時は真空ポンプ35を停止して気相室13内の真空排気を行わず、気相室13内に凝縮水が溜まったときに真空ポンプ35を作動して凝縮水の排出動作を行ったこと以外は同様にして酸素溶解水を製造した。
なお、本出願は、2009年3月31日付で出願された日本特許出願(特願2009-086343)に基づいており、その全体が引用により援用される。
Claims (9)
- 気体透過膜によって気相室と液相室に区画された気体透過膜モジュールを有し、通水手段によって該液相室に被処理水を通水すると共に、ガス供給手段によって該気相室にガスを供給し、該ガスを該気相室から該気体透過膜を介して該液相室内の該被処理水に溶解させることにより、該被処理水をガス溶解水とするガス溶解水供給装置において、
真空排気手段によって該気相室内を真空排気しながら、前記ガス供給手段によって該気相室内に該ガスを供給するように該真空排気手段を設けたことを特徴とするガス溶解水供給装置。 - 請求項1において、該ガス溶解水の溶存ガス濃度の測定手段と、
該測定手段の測定値に応じて該ガス供給手段からの該ガスの供給量を調整することにより、該溶存ガス濃度を制御する制御手段と
を有することを特徴とするガス溶解水供給装置。 - 請求項1又は2において、前記気相室の下部に、前記真空排気手段との接続口が設けられていることを特徴とするガス溶解水供給装置。
- 請求項1ないし3のいずれか1項において、前記ガスが酸素を含むことを特徴とするガス溶解水供給装置。
- 請求項4において、該ガス溶解水の溶存ガス濃度が、該ガスの溶解度の1/400以下であることを特徴とするガス溶解水供給装置。
- 請求項1ないし3のいずれか1項において、前記ガスが炭酸ガスを含むことを特徴とするガス溶解水供給装置。
- 請求項6において、該ガス溶解水の溶存ガス濃度が、該ガスの溶解度の1/50以下であることを特徴とするガス溶解水供給装置。
- 請求項1ないし3のいずれか1項において、前記ガスが、窒素、アルゴン、オゾン、水素、クリーンエア及び希ガスの少なくとも1つを含むことを特徴とするガス溶解水供給装置。
- 請求項1ないし8のいずれか1項に記載のガス溶解水供給装置を用いたガス溶解水の製造方法であって、
前記液相室に被処理水を通水すると共に、該気相室内を真空排気しながら該気相室内にガスを供給し、該ガスを該気相室から前記気体透過膜を介して前記液相室内の該被処理水に溶解させることにより、該被処理水をガス溶解水とすることを特徴とするガス溶解水の製造方法。
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CN113412146A (zh) * | 2019-03-07 | 2021-09-17 | 日本多宁股份有限公司 | 加氢装置以及氢透过膜的消耗度判定方法 |
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JP5872321B2 (ja) * | 2012-02-24 | 2016-03-01 | 柴田 猛 | 透析液・原液水素還元装置 |
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JP2016064386A (ja) * | 2014-09-18 | 2016-04-28 | 株式会社荏原製作所 | ガス溶解水製造装置および製造方法 |
WO2016042740A1 (ja) * | 2014-09-18 | 2016-03-24 | 株式会社荏原製作所 | ガス溶解水製造装置および製造方法 |
JP6407764B2 (ja) * | 2015-02-26 | 2018-10-17 | 東京エレクトロン株式会社 | 基板処理システム、基板処理システムの制御方法、及び記憶媒体 |
JP6565347B2 (ja) * | 2015-06-08 | 2019-08-28 | 栗田工業株式会社 | ガス溶解水の製造方法 |
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