WO2023090270A1 - ウルトラファインバブル濃縮液の製造方法およびウルトラファインバブル液の濃縮装置 - Google Patents

ウルトラファインバブル濃縮液の製造方法およびウルトラファインバブル液の濃縮装置 Download PDF

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WO2023090270A1
WO2023090270A1 PCT/JP2022/042096 JP2022042096W WO2023090270A1 WO 2023090270 A1 WO2023090270 A1 WO 2023090270A1 JP 2022042096 W JP2022042096 W JP 2022042096W WO 2023090270 A1 WO2023090270 A1 WO 2023090270A1
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liquid
fluid
vaporization container
ultra
stock solution
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PCT/JP2022/042096
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English (en)
French (fr)
Japanese (ja)
Inventor
宏一 寺坂
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慶應義塾
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Priority to JP2023561571A priority Critical patent/JPWO2023090270A1/ja
Priority to CN202280075870.8A priority patent/CN118338955A/zh
Publication of WO2023090270A1 publication Critical patent/WO2023090270A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • 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
    • B01F23/237—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media
    • B01F23/2373—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media for obtaining fine bubbles, i.e. bubbles with a size below 100 µm
    • B01F23/2375—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media for obtaining fine bubbles, i.e. bubbles with a size below 100 µm for obtaining bubbles with a size below 1 µm
    • 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
    • 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
    • B01F35/90—Heating or cooling systems

Definitions

  • the present invention relates to an ultra-fine bubble concentrate manufacturing technology and an ultra-fine bubble liquid concentrator.
  • Patent Document 1 discloses that by heating an ultra-fine bubble liquid under reduced pressure conditions, a part of the liquid component of the ultra-fine bubble water is vaporized to form high-density ultra-fine bubbles. A method of obtaining water is described.
  • An ultra-fine bubble liquid is a liquid in which a large number of fine bubbles are present, and the diameter of each of the large number of bubbles is less than 1 ⁇ m. It is generally known as an ultra-fine bubble liquid in which a large number of fine air bubbles are present in the liquid, and because it has different characteristics from water, carbonated water, and aqueous solutions, it is used in various industrial fields. being considered. Further, in consideration of stabilizing the performance of the ultra-fine bubble liquid or facilitating the handling of the ultra-fine bubble liquid, a technique for controlling the number density of the ultra-fine bubbles, in other words, the number concentration of the ultra-fine bubbles is desired.
  • Patent Document 1 in the case of the concentration method of vaporizing the liquid component of the ultra-fine bubble liquid under a reduced pressure atmosphere, a high-concentration ultra-fine bubble liquid can be obtained.
  • Patent Literature 1 it is necessary to collect the ultra-fine bubble concentrate in the container for each concentration treatment and to newly supply the ultra-fine bubble solution before concentration to the container. For this reason, in order to obtain a large amount of ultra-fine bubble concentrated liquid, there is room for improvement in terms of work efficiency or further densification.
  • An object of the present invention is to provide a technology for producing an ultra-fine bubble liquid with a high number density of ultra-fine bubbles.
  • a method for producing an ultra-fine bubble concentrate includes the following steps. (a) preparing an undiluted liquid containing a first fluid in a liquid state and a second fluid in a gaseous state, in which bubbles of the second fluid having a diameter of less than 1 ⁇ m are mixed in the first fluid, in a liquid feeder; process, (b) sending part of the stock solution from the stock solution supply unit to a vaporization container under a reduced pressure atmosphere; (c) rotating the vaporization container while heating the stock solution in the vaporization container under a reduced pressure atmosphere to selectively remove the first fluid contained in the stock solution;
  • step (c) another part of the stock solution is continuously supplied from the stock solution supply unit into the vaporization container.
  • an ultra-fine bubble liquid having a high number density of ultra-fine bubbles can be obtained.
  • FIG. 4 is an explanatory diagram schematically showing the behavior of non-ultrafine bubbles and ultrafine bubbles present in water. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows an example of the flow of the manufacturing method of the ultra-fine bubble concentrate which is one Embodiment.
  • FIG. 4 is a cross-sectional view showing an ultra-fine bubble liquid before concentration treatment;
  • FIG. 2 is an explanatory diagram showing a configuration example of a concentrating device used for producing an ultra-fine bubble concentrated liquid according to one embodiment.
  • FIG. 5 is an explanatory view showing a state in which part of the undiluted solution is fed from the undiluted solution supply unit shown in FIG. 4 to the vaporized solution;
  • FIG. 4 is a cross-sectional view showing an ultra-fine bubble liquid before concentration treatment
  • FIG. 2 is an explanatory diagram showing a configuration example of a concentrating device used for producing an ultra-fine bubble concentrated liquid according to one embodiment.
  • FIG. 5 is an explanatory view showing
  • FIG. 6 is an explanatory diagram showing an enlarged view of the vaporization container and the periphery of the heating unit shown in FIG. 5;
  • FIG. 6 is an explanatory view showing a state in which part of the undiluted solution shown in FIG. 5 has been recondensed and stored in a liquid reservoir.
  • FIG. 2 is an explanatory diagram schematically showing the potential generated in an electrically conductive liquid containing ultrafine bubbles and the force generated by the potential.
  • FIG. 9 is an explanatory diagram schematically showing a state in which part of the liquid shown in FIG. 8 is vaporized;
  • FIG. 7 is a cross-sectional view taken along line AA of FIG. 6;
  • FIG. 11 is a cross-sectional view showing a modification to FIG. 10;
  • FIG. 3 is an explanatory diagram showing an example of the flow of a method for producing an ultra-fine bubble concentrated liquid, which is a modified example of FIG. 2 .
  • FIG. 8 is an explanatory diagram showing a state in which the liquid in the liquid storage section shown in FIG. 7 is discharged;
  • FIG. 14 is an explanatory view showing a state in which the inside of the liquid storage section shown in FIG. 13 is again communicated with the vaporization container, and the concentration process is restarted;
  • FIG. 5 is an explanatory view showing a modified example of the concentrating device shown in FIG. 4;
  • FIG. 1 is an explanatory diagram schematically showing the behavior of non-ultrafine bubbles and ultrafine bubbles present in water.
  • the liquid 10 is water.
  • Each of the ultra-fine bubbles 20A and the non-ultra-fine bubbles 20B is air bubbles.
  • Various substances can be used for the liquid and bubbles of the ultra-fine bubble liquid produced by the technique described below, but in the following embodiments, the liquid 10 is water and the ultra-fine bubbles 20A are air. A case will be taken up and explained as an example.
  • a plurality of bubbles 20 including ultrafine bubbles 20A and non-ultrafine bubbles 20B are present in the liquid 10.
  • the ultra-fine bubbles 20A and the non-ultra-fine bubbles 20B can be distinguished by the diameter of the air bubbles 20.
  • the bubble diameter D1 of the ultra-fine bubbles 20A is less than 1 ⁇ m.
  • the bubble diameter D2 of the non-ultra-fine bubbles 20B is 1 ⁇ m or more. Since the ultra-fine bubbles 20A have a small bubble diameter, they have a shape that can be regarded as almost spherical.
  • the non-ultra-fine bubbles 20B include those existing in the liquid 10 in various shapes such as elliptical spheres as illustrated in FIG.
  • the short diameter of the elliptical sphere is shown as the bubble diameter D2 for convenience, but the bubble diameter D2 of the non-ultra-fine bubbles 20B is defined as the diameter of the non-ultra-fine bubbles 20B converted to a sphere.
  • the bubble diameter D1 of the ultra-fine bubbles 20A is defined as the diameter when each bubble 20 is converted into a sphere, like the bubble diameter D2 described above.
  • the non-ultra-fine bubbles 20B float toward the liquid surface 10t due to the buoyancy generated in the liquid 10 and burst at the liquid surface 10t.
  • the ultra-fine bubbles 20A have a small bubble diameter D1 of less than 1 ⁇ m, they can stably maintain their shape in the liquid 10.
  • the bubble diameter D1 of the ultra-fine bubbles 20A is small, the floating speed of the ultra-fine bubbles 20A calculated by the Stokes equation is faster than the random movement speed of the ultra-fine bubbles 20A in the up, down, left, right, front and back due to the Brownian motion. slow.
  • the ultra-fine bubbles 20A do not float toward the liquid surface 10t and can continue to float in the liquid 10 for a long period of time.
  • non-ultra-fine bubbles 20B those with a relatively small bubble diameter D2 (for example, less than 100 ⁇ m) are called microbubbles, and are sometimes collectively called fine bubbles as the ultra-fine bubbles 20A. It can be visually identified as follows. That is, water containing microbubbles is cloudy. On the other hand, water containing only the ultra-fine bubbles 20A is colorless and transparent. This is because most of the ultra-fine bubbles 20A do not scatter visible light due to the small bubble diameter D1 of the ultra-fine bubbles 20A.
  • the inventor of the present application is studying a technique for controlling the number density of ultra-fine bubbles.
  • the “ultra-fine bubble number density” is the number of ultra-fine bubbles contained in a unit volume of ultra-fine bubble liquid.
  • “Ultra-fine bubble number density” can also be read as “ultra-fine bubble number concentration”.
  • the number density of ultra-fine bubbles in the ultra-fine bubble liquid can be measured, for example, as follows.
  • the ultrafine bubble liquid is irradiated with a two-dimensional plane laser beam, and the number of ultrafine bubbles in the volume of the field of view is determined from the photographing of the laser scattered light spots from the ultrafine bubbles moving in Brownian motion.
  • the number density can be obtained by counting .
  • the gas-liquid mixed fluid shearing production method is a method of pulverizing a gas-liquid mixed fluid in which gas and liquid are mixed to generate fine bubbles.
  • Methods for pulverizing the gas-liquid mixed fluid include, for example, a method of swirling the gas-liquid mixed fluid and utilizing its swirling force, and a method of passing the gas-liquid mixed fluid through a static mixer and utilizing its shearing force. and can be exemplified.
  • the aeration type manufacturing method is a method of supplying gas into a liquid through a porous film having fine pores formed therein.
  • an ultra-fine bubble liquid can be produced, but it is difficult to control the number density of ultra-fine bubbles in the liquid. Therefore, the inventors of the present application have investigated a method of controlling the number density of ultra-fine bubbles by diluting or concentrating the ultra-fine bubble liquid obtained by the above-described methods.
  • a method for increasing the number density of ultra-fine bubbles to a predetermined value as described in Patent Document 1, an evaporator is used to heat ultra-fine bubble water under reduced pressure conditions to evaporate moisture.
  • the method for producing an ultra-fine bubble concentrate according to the present embodiment includes a stock solution preparation step, a liquid transfer start step, and a concentration step.
  • FIG. 2 is an explanatory diagram showing an example of the flow of the method for producing an ultra-fine bubble concentrate according to the present embodiment.
  • FIG. 3 is a cross-sectional view showing the ultra-fine bubble liquid before concentration treatment.
  • FIG. 4 is an explanatory diagram showing a configuration example of a concentrating device used for producing an ultra-fine bubble concentrated liquid according to the present embodiment.
  • the concentrating device 100 used in the method for producing the ultra-fine bubble concentrated liquid shown in FIG. It has a portion 80 and a liquid storage portion 90 .
  • the undiluted solution supply unit 50 is connected to the vaporization container 40 and has a function of continuously supplying the unconcentrated undiluted solution UFB1 to the vaporization container 40 .
  • the cooling unit 60 is connected to the vaporization container 40 and has a function of condensing the vaporized fluid 11 .
  • the decompression mechanism section 70 is connected to the condenser 61 of the cooling section 60 .
  • the decompression mechanism 70 reduces the pressure of the vaporization container 40 and the space (condenser 61 , the internal pressures of the vaporization container 40 and the liquid reservoir 91) can be brought to a reduced pressure state lower than 1 atm.
  • the heating unit 80 includes a heating mechanism unit 83 that heats the liquid in the vaporization container 40 while adjusting its temperature.
  • the liquid storage part 90 has a function of storing the condensed liquid state fluid 11 after selectively vaporizing. The operation of each unit will be described later.
  • the undiluted solution UFB1 shown in FIG. 3 is prepared.
  • the undiluted solution UFB 1 contains a liquid state fluid (first fluid) 11 and a gaseous state fluid (second fluid) 21 .
  • the undiluted liquid UFB1 is a so-called ultra-fine bubble liquid, and the diameter of the bubbles 21A of the fluid 21 (bubble diameter D1 shown in FIG. 1) is less than 1 ⁇ m.
  • a liquid 11B composed of the fluid 11 is mixed with bubbles 21A at a first number density. Since the undiluted solution UFB1 is an ultra-fine bubble solution before concentration treatment, the value of the first number density is arbitrary.
  • the first number density (the number of bubbles 21A contained in 1 ml of undiluted solution UFB1) is, for example, about 0.1 ⁇ 10 8 to 30 ⁇ 10 8 /mL.
  • the liquid 11B made up of the fluid 11 is water
  • the bubbles 21A made up of the fluid 21 are air.
  • the materials used for fluid 11 and fluid 21 have various applications.
  • a liquid obtained by dissolving another substance in the fluid 11, which is water, can be used instead of the liquid 11B.
  • a fluid containing an inert gas such as nitrogen or a rare gas, or a reactive gas such as ozone can be used.
  • a known method can be adopted as the method for producing the undiluted solution UFB1.
  • the pressure dissolution type production method, the gas-liquid mixed fluid shearing type production method, the gas-liquid mixed fluid pulverization method, or the air diffusion type production method described above can be used.
  • the undiluted solution UFB1 which is an ultra-fine bubble liquid in which ultra-fine bubbles are dispersed at the first number density, is obtained.
  • the manufactured undiluted solution UFB1 is transported to the undiluted solution supply unit 50 shown in FIG.
  • the liquid transfer start step includes a decompression step of reducing the internal pressure of the vaporization container 40 to a decompression state lower than the atmospheric pressure by operating the decompression mechanism 70 .
  • the decompression mechanism 70 includes an intake path 72 connected to the vacuum pump 71 and a pressure gauge 73 connected to the intake path 72 .
  • the intake path 72 has one end connected to the vacuum pump 71 and the other end connected to the condenser 61 of the cooling section 60 .
  • the condenser 61 communicates with the space inside the vaporization container 40 .
  • the three-way valve 92 connected to the liquid storage section (first fluid storage section) 91 has a path from the condenser 61 to the liquid storage section 91 in an open state and a path to the outside in a closed state. controlled to be Further, in the depressurization process, the valve 94 connecting the liquid storage section 91 and the waste liquid recovery section 93 is controlled to be in a closed state. Further, in the depressurization step, the valve 52 connecting the undiluted solution supply unit 50 and the vaporization container 40 is controlled to be closed. In other words, in the decompression step, the flow path 49 communicating between the vaporization container 40 and the liquid storage section 90 is not blocked, and the flow path P54 connecting the raw liquid supply section 50 and the vaporization container 40 is blocked. be implemented.
  • the pressure is reduced until the value measured by the pressure gauge 73 reaches 70 hPa (hPa), and then the pressure reduction mechanism 70 is intermittently operated so as to maintain 70 hPa. make it work.
  • the liquid transfer start step after the decompression step, part of the undiluted solution UFB1 is fed from the undiluted solution storage portion 51 of the undiluted solution supply portion 50 to the vaporization container 40 .
  • the valve 52 and the needle valve 53 are opened.
  • the channel P54 that connects the undiluted solution supply unit 50 and the vaporization container 40 is opened.
  • the valve 52 and the needle valve (flow control valve) 53 are opened, the undiluted solution UFB1 in the undiluted solution storage part 51 automatically evaporates due to the pressure difference. is sucked up and transferred into the vaporization container 40 .
  • a flow meter 55 is connected to a liquid feeding path (a path for transporting the undiluted solution UFB1 between the undiluted liquid reservoir 51 and the valve 52).
  • the flow rate of the undiluted solution UFB1 (in other words, the liquid feeding speed) is monitored by a flow meter 55, and the opening of the needle valve 53 is controlled based on the measurement value of the flow meter 55, thereby controlling the liquid feeding speed of the undiluted solution UFB1. can be done.
  • FIG. 6 is an enlarged explanatory view showing the vicinity of the vaporization container and heating unit shown in FIG.
  • FIG. 7 is an explanatory view showing a state in which part of the undiluted solution shown in FIG. 5 is recondensed and stored in the liquid reservoir.
  • the inner surface 42 of the evaporation container 40 of the concentrator 100 is curved.
  • the bottom surface 40b of the vaporization container 40 is round and has no boundary with the side surface.
  • the vaporization container 40 is, for example, an eggplant-shaped flask.
  • the vaporization container 40 is rotatably supported around an axis (first axis) VL1.
  • Axis VL1 is inclined at an angle of less than 90 degrees with respect to the vertical or horizontal direction.
  • the axis VL1 is inclined at an angle of about 20 to 30 degrees with respect to the horizontal direction.
  • the heating unit 80 of the concentrator 100 includes circulating water 81 arranged around the evaporation container 40 and a bathtub 82 containing the circulating water 81 . Moreover, in the example shown in FIG. 6, the heating unit 80 has a heating mechanism unit 83 capable of heating while controlling the temperature of the circulating water 81 .
  • the circulating water 81 sequentially flows into the heating mechanism portion 83 , and the circulating water 81 is heated by contact between the heat source 84 such as a heater and the circulating water 81 .
  • the temperature of the circulating water 81 is monitored by a thermometer 85, and by controlling the operation of the heat source 84 based on the measurement result of the thermometer 85, the temperature of the circulating water 81 can be controlled.
  • a fluid other than water can be used as the circulating water 81 .
  • the heating temperature in the concentration step is, for example, 70° C. or lower. Therefore, considering versatility, it is preferable to use water as the circulating water 81 .
  • the vaporization container 40 shown in FIG. 6 is heated by the heating unit 80 while rotating about the axis VL1 in a reduced pressure atmosphere.
  • the rotation speed is 30 187 rpm
  • the pressure in the vaporization container 40 (strictly, the measured value of the pressure gauge 73 shown in FIG. 5) is 100 hPa or less (particularly preferably 70 hPa or less)
  • the heating temperature by the heating unit 80 (strictly, FIG. 6 (measured value of the thermometer 85 shown in ) is preferably 70° C. or less (particularly preferably 60° C. or less).
  • the liquid-phase fluid 11 of the undiluted fluid UFB1 shown in FIG. 5 is vaporized.
  • the disappearance of the air bubbles 21A is hardly confirmed when the fluid 11 is vaporized. That is, in this step, since the liquid-phase fluid 11 is selectively vaporized, the ultra-fine bubble liquid UFB2 after part of the fluid 11 shown in FIG. 6 is vaporized is compared with the undiluted liquid UFB1 (see FIG. 5). It is an ultra-fine bubble concentrate with a high number density of bubbles 21A.
  • the mechanism by which the fluid 11 is selectively vaporized and the bubbles 21A are less likely to disappear will be described later. As shown in FIG.
  • the vaporized fluid 11 is recondensed in the cooling section 60 and stored in the liquid storage section 91 as the liquid 11B.
  • the cooling section 60 has a condenser 61 and a refrigerant circulator 62 .
  • the vaporized fluid 11 is cooled and condensed by exchanging heat with the refrigerant supplied from the refrigerant circulator 62 in the condenser 61 .
  • the condensed fluid 11 falls due to gravity and is stored in a reservoir 91 arranged below the condenser 61 .
  • the ultra-fine bubble liquid UFB2 in the vaporization container 40 is taken out to the outside, and the process from the stock solution preparation step shown in FIG. 2 again or from the liquid transfer start step to the concentration step shown in FIG. The cycle will repeat.
  • the time required for the concentration step is long and the preparation time is long, so there is room for improvement in terms of production efficiency when it is necessary to obtain a large amount of ultra-fine bubble concentrate.
  • the undiluted solution UFB1 is continuously supplied from the undiluted solution supply unit 50 into the vaporization container 40 in the concentration step.
  • the undiluted solution UFB1 is continuously supplied from the undiluted solution supply unit 50 during the concentration process.
  • the raw solution UFB1 is automatically removed by utilizing the pressure difference between the internal pressure of the vaporization container 40 and the atmospheric pressure around the raw solution storage part 51. can be supplied to Therefore, as long as there is an empty space in the liquid reservoir 91 shown in FIG. 7, the concentration process can be performed continuously.
  • the undiluted solution storage unit 51 is replenished with new undiluted solution UFB1 as needed.
  • the feed rate of the stock solution UFB1 is the same as the vaporization rate of the fluid 11 in the vaporization container 40 .
  • the volume reduction rate of the liquid in the vaporization container 40 and the flow rate of the undiluted liquid UFB1 per unit time are the same.
  • the vaporization container 40 Since the fluid 11 in the vaporization container 40 is selectively vaporized as described above and transferred to the liquid storage section 91, the vaporization container 40 is less likely to become full. As described above, according to the present embodiment, the concentration process can be performed continuously until the liquid storage section 91 becomes full. Manufacturing efficiency can be improved.
  • the volume of the liquid contained in the vaporization container 40 is substantially constant. Strictly speaking, the volume of the liquid slightly decreases as the number density of the bubbles 21A increases, but it can be considered substantially constant.
  • the number density of the bubbles 21A in the ultra-fine bubble liquid UFB2 in the vaporization container 40 can be further increased. In other words, according to the present embodiment, the number density of the bubbles 21A in the obtained ultra-fine bubble concentrate can be increased compared to the batch method.
  • the ultra-fine bubble liquid UFB2 obtained by recovering from the vaporization container 40 shown in FIG. 7 contains bubbles 21A at a second number density higher than the first number density of the undiluted liquid UFB1.
  • the second number density (number of bubbles 21A contained in 1 ml of ultra-fine bubble liquid UFB2) is, for example, about 40 ⁇ 10 8 to 53 ⁇ 10 8 /mL.
  • the valve 52 shown in FIG. 7 is closed once the liquid reservoir 91 is full, and the concentration process is once stopped.
  • the channel P54 that communicates the undiluted solution supply unit 50 and the vaporization container 40 is temporarily blocked.
  • the operation of the vacuum pump 71 is stopped to return the pressure inside the vaporization container 40 to the atmospheric pressure.
  • the ultra-fine bubble liquid UFB2 in the vaporization container 40 is recovered. By this recovery process, an ultra-fine bubble concentrate can be obtained.
  • the three-way valve 92 only needs to be able to change the opening/closing state of the flow path P49.
  • a normal valve that is not a three-way valve (a valve that can change the open state and the closed state of one channel) can be used.
  • the liquid 11 in the liquid reservoir 91 may be discharged without recovering the ultra-fine bubble liquid UFB2 in the vaporization container 40, and the concentration step may be performed again.
  • FIG. 8 is an explanatory diagram schematically showing the potential generated in an electrically conductive liquid containing ultrafine bubbles and the force generated by the potential.
  • FIG. 9 is an explanatory diagram schematically showing a state in which part of the liquid shown in FIG. 8 is vaporized.
  • Liquid 11B comprising fluid 11 is an electrically conductive liquid such as water.
  • a potential zeta potential
  • a negative potential is generated on the surface of the bubble 21A as shown in FIG.
  • a surface 11t of the liquid 11B is a gas-liquid free interface, and a negative potential is generated on the surface 11t.
  • the distance from the bottom surface 45b of the vaporization container 45 to the surface 11t of the liquid 11, ie, the water depth, is about several centimeters to several tens of centimeters.
  • the situation is different when the liquid 11B is vaporized under a reduced pressure atmosphere as in the present embodiment. That is, by lowering the atmospheric pressure during heating, the influence of the water pressure due to the water depth of the liquid 11B increases.
  • the liquid 11B is heated to about 60° C. to 70° C. under an ambient pressure of 100 hPa or less, vaporization occurs near the surface 11t of the liquid 11B, but does not occur near the bottom surface 45b.
  • the repulsive force F2 shown in FIG. 8 there are almost no bubbles 21A in the vicinity of the surface 11t.
  • the distance between the surface 11t and the bottom surface 45b gradually decreases, so that the distance between the vicinity of the surface 11t and the vicinity of the bottom surface 45b is reduced. Water pressure difference becomes smaller. As a result, the possibility of losing the bubble 21A increases.
  • part of the undiluted solution UFB1 (see FIG. 7) from the undiluted solution supply unit 50 (see FIG. 7) is transferred to the vaporization container (40). continuously fed into the Accordingly, even when the liquid 11B is continuously vaporized, it is possible to prevent the distance between the surface 11t and the bottom surface 45b from approaching.
  • the volume of the liquid 11B vaporized per unit time is equal to the volume of the undiluted solution UFB1 supplied per unit time.
  • FIG. 10 is a cross-sectional view taken along line AA of FIG. 6.
  • FIG. 11 is a cross-sectional view showing a modification to FIG. 10.
  • FIG. 6 which schematically shows the rotation direction R1 of the vaporization container 40 in FIG. 10 and FIG.
  • a first trajectory 43 is defined as a trajectory having the longest trajectory distance among trajectories that make one round of the inner surface 42 of the vaporization container 40 along a plane perpendicular to the plane.
  • 10 and 11 are cross-sectional views including the first track 43.
  • selective removal of the fluid 11 is achieved by controlling the pressure and heating temperature within the vaporization container 40 so that the liquid 11B is vaporized near the surface 11t of the liquid 11B. In order to improve the efficiency of the concentration process, it is preferable to increase the amount of vaporization of the liquid 11B per unit time.
  • the liquid film portion 11F is formed along the inner surface 42 of the vaporization container 40.
  • the liquid 11B that is rotating in the concentration step is composed of the liquid film portion 11F formed along the inner surface 42 of the vaporization container 40, the liquid film portion 11F formed along the inner surface 42 of the vaporization container 40, and and a body portion 11M connected to the liquid film portion 11F.
  • the area of the surface 11t of the liquid 11B can be increased.
  • the liquid 11B is vaporized in the vicinity of the surface 11t of the liquid 11B. volume can be increased. That is, the efficiency of concentration processing can be improved.
  • the range in which the liquid film portion 11F is formed increases in proportion to the rotational speed of the vaporization container 40.
  • the vaporization container rotates at such a rotational speed that 3/4 or more of the first track 43 is in contact with the fluid 11 .
  • part of the liquid 11B drops to the main body portion 11M as droplets 11D.
  • the vaporization container 40 rotates at such a rotational speed that the entire first track 43 is in contact with the fluid 11 . In this case, since the droplet 11D as shown in FIG. 11 is not generated, it is possible to prevent the bubble 21A from disappearing when the droplet 11D falls.
  • the inventor of the present application experimentally confirmed that 300 ml of undiluted solution UFB1 (see FIG. 5) was supplied to a vaporization container 40 having a capacity of 1000 ml (ml), and found that the rotation speed of the vaporization container 40 was 30 rpm (round per minute). ), the liquid film portion 11F could be confirmed. Further, it was confirmed that the entire first track 43 was in contact with the fluid 11 when the rotation speed of the vaporization container 40 was 187 rpm, as shown in FIG. During the above experiment, the axis VL1, which is the rotation axis of the evaporation container 40 shown in FIG.
  • the thickness T1 from the surface 11t of the liquid 11B to the inner surface 42 in the main body portion 11M is larger than the thickness T2 from the surface 11t to the inner surface 42 of the liquid 11B in the liquid film portion 11F.
  • the thickness T1 of the main body portion 11M varies depending on the measurement location and is not constant. If the thickness T1 of the body portion 11M is not constant, it is sufficient if there is a portion thicker than the thickness T2 of the liquid film portion 11F in one or more locations of the body portion 11M.
  • FIG. 12 is an explanatory diagram showing an example of the flow of a method for producing an ultra-fine bubble concentrate, which is a modification of FIG.
  • the modification shown in FIG. 12 is different from the ultra-fine bubble concentrate production method shown in FIG. 2 in that it includes a liquid discharge step and a concentration restart step after the concentration step.
  • the flow shown in FIG. 12 will be described below.
  • this modified example is the same as the manufacturing flow described using FIG. 2 from the active preparation process to the concentration process. Therefore, redundant description will be omitted, and the liquid discharge process and the concentration restart process will be described.
  • FIG. 13 is an explanatory diagram showing a state in which the liquid in the liquid reservoir shown in FIG. 7 is discharged.
  • the three-way valve 92 is operated to block the flow path P49.
  • the three-way valve 92 is used as the valve for changing the opening/closing state of the flow path P49, so the liquid storage section 91 communicates with the outside. As a result, air enters the liquid storage section 91 from the outside and the pressure becomes atmospheric pressure.
  • the valve 94 is changed to the open state, the liquid 11B is discharged from the liquid storage section 91 to the waste liquid collection section 93 . After the liquid 11B in the liquid storage part 91 is discharged, the valve 95 is changed to the closed state.
  • the undiluted liquid UFB1 is replenished in the undiluted liquid storage unit 51 as necessary.
  • FIG. 14 is an explanatory diagram showing a state in which the inside of the liquid storage portion shown in FIG. 13 is again communicated with the vaporization container, and the concentration process is restarted.
  • the channel P49 is unblocked.
  • the three-way valve 92 is operated to open the flow path P49.
  • the liquid storage section 91 communicates with the evaporation container 40 and the condenser 61 of the cooling section 60 , so that the gas in the liquid storage section 91 is sucked by the vacuum pump 71 .
  • the valve 52 is closed in the liquid discharging step, the valve 52 is opened in the concentration restarting step. As a result, it is possible to perform the same processing as the concentration step described with reference to FIG.
  • the number density of the bubbles 21A in the ultra-fine bubble liquid UFB2 in the vaporization container 40 can be increased to an arbitrary value.
  • the number density of the bubbles 21A at the time when the concentration efficiency decreases can be set to a limit value, and the liquid discharging process and the re-concentration process can be repeatedly performed until this limit value is reached.
  • an ultra-fine bubble concentrated liquid is obtained.
  • the method for obtaining the ultra-fine bubble concentrate is the same as the method described with reference to FIGS. 2 and 7.
  • the operation of the vacuum pump 71 is stopped to return the pressure inside the vaporization container 40 to the atmospheric pressure.
  • the ultra-fine bubble liquid UFB2 in the vaporization container 40 is recovered. By this recovery process, an ultra-fine bubble concentrate can be obtained.
  • the ultra-fine bubble liquid UFB2 obtained by recovering from the vaporization container 40 shown in FIG. 7 contains bubbles 21A at a second number density higher than the first number density of the undiluted liquid UFB1.
  • the second number density (number of bubbles 21A contained in 1 ml of ultra-fine bubble liquid UFB2) is, for example, about 40 ⁇ 10 8 to 53 ⁇ 10 8 /mL.
  • FIG. 15 is an explanatory diagram showing a modified example of the concentrator shown in FIG.
  • a concentrating device 101 shown in FIG. 15 differs from the concentrating device 100 shown in FIG. 4 in that it includes a control device 101C.
  • the control device 101C includes a driving portion 41, a valve 52, a needle valve 53, a flow meter 54, a refrigerant circulator 62, a vacuum pump 71, a pressure gauge 73, and a heating mechanism portion 83 (more specifically, It is connected to each of the heat source 84 and the thermometer 85), the three-way valve 92, and the valve 94 shown in FIG. 6 in a state in which signals can be transmitted.
  • "connected in a state in which signal transmission is possible” includes a state in which signal transmission is possible by wireless communication as well as a state in which they are electrically connected via an electric wire or the like.
  • the control device 101C can control the opening and closing operations of the valve 52, the three-way valve 92, and the valve 94 by transmitting command signals.
  • the control device 101C also receives the measurement data of the flow meter 54, generates a command signal for changing the opening of the needle valve 53 based on the received data, and transmits the command signal to open the needle valve 53. degree can be controlled. Further, the control device 101C can control the temperature of the refrigerant and the ON/OFF operation of the refrigerant circulator 62 by transmitting command signals to the refrigerant circulator 62 .
  • the control device 101C also receives the measurement data of the pressure gauge 73, generates a command signal for changing the operating state of the vacuum pump 71 (for example, on-off operation and pump rotation speed) based on the received data, By transmitting the signal, the operating state of the vacuum pump 71 can be controlled.
  • the control device 101C also receives measurement data from the thermometer 85 (see FIG. 6) and generates a command signal for changing the operating state of the heat source 84 (for example, on-off operation or set temperature) based on the received data. , the operating state of the heat source 84 can be controlled by transmitting this command signal.
  • the operation of each part of the concentrating device 101 can be automated by the control device 101C, so that the working efficiency can be improved compared to the case of manual operation.
  • the present invention is not limited to the above-described embodiments and examples, and can be modified in various ways without departing from the spirit of the present invention.
  • the second fluid for example, an inert gas such as nitrogen or a rare gas, or a fluid containing radical molecules such as ozone can be used.
  • the first fluid can be replaced with a fluid that becomes liquid at room temperature other than water. If the fluid is liquid phase and has electrical conductivity, the relationship between the repulsive force F1 and the repulsive force F2 described with reference to FIG. 8 can be established.
  • various modifications have been described above, but a part of the embodiment can be applied in combination with another embodiment.
  • the present invention can be used for ultra-fine bubble liquids that are used in various industrial fields.

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  • Engineering & Computer Science (AREA)
  • Nanotechnology (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
PCT/JP2022/042096 2021-11-16 2022-11-11 ウルトラファインバブル濃縮液の製造方法およびウルトラファインバブル液の濃縮装置 WO2023090270A1 (ja)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5990602A (ja) * 1982-11-16 1984-05-25 Tokyo Rika Kikai Kk エバポレ−タ
JPS5995901A (ja) * 1982-11-25 1984-06-02 Yamato Scient Co Ltd ロ−タリエバポレ−タの回転制御方法
JP2017094300A (ja) * 2015-11-26 2017-06-01 三菱重工交通機器エンジニアリング株式会社 微小気泡生成システム
JP2018102293A (ja) * 2016-12-22 2018-07-05 トスレック株式会社 飲料製造システムおよび飲料製造方法
JP2020131057A (ja) * 2019-02-13 2020-08-31 東京理化器械株式会社 ロータリーエバポレーター
JP2021126607A (ja) * 2020-02-12 2021-09-02 キヤノン株式会社 ウルトラファインバブル生成方法およびウルトラファインバブル生成装置
JP2021126603A (ja) * 2020-02-12 2021-09-02 キヤノン株式会社 ウルトラファインバブル生成装置
JP2021137796A (ja) * 2020-02-28 2021-09-16 キヤノン株式会社 ウルトラファインバブル含有液の製造装置、製造方法、およびウルトラファインバブル含有液

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5990602A (ja) * 1982-11-16 1984-05-25 Tokyo Rika Kikai Kk エバポレ−タ
JPS5995901A (ja) * 1982-11-25 1984-06-02 Yamato Scient Co Ltd ロ−タリエバポレ−タの回転制御方法
JP2017094300A (ja) * 2015-11-26 2017-06-01 三菱重工交通機器エンジニアリング株式会社 微小気泡生成システム
JP2018102293A (ja) * 2016-12-22 2018-07-05 トスレック株式会社 飲料製造システムおよび飲料製造方法
JP2020131057A (ja) * 2019-02-13 2020-08-31 東京理化器械株式会社 ロータリーエバポレーター
JP2021126607A (ja) * 2020-02-12 2021-09-02 キヤノン株式会社 ウルトラファインバブル生成方法およびウルトラファインバブル生成装置
JP2021126603A (ja) * 2020-02-12 2021-09-02 キヤノン株式会社 ウルトラファインバブル生成装置
JP2021137796A (ja) * 2020-02-28 2021-09-16 キヤノン株式会社 ウルトラファインバブル含有液の製造装置、製造方法、およびウルトラファインバブル含有液

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