JP2007229714A - Apparatus and method of manufacturing carbonated water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for manufacturing carbonated water with a constant concentration of carbon dioxide inexpensively with a simple operation. <P>SOLUTION: The apparatus for manufacturing carbonated water supplies carbon dioxide while running raw water in a membrane type carbon dioxide dissolution receptacle 3 to dissolve carbon dioxide in raw water, which apparatus is equipped with a means preliminarily recording correlation data of a flow rate of raw water, a supply pressure of carbon dioxide, and a concentration of carbon dioxide of carbonated water to be obtained, detecting the flow rate of raw water upon manufacturing carbonated water, and controlling the supply pressure of carbon dioxide from the correlation data so that the carbonated water to be obtained has a target concentration of carbon dioxide. The method of manufacturing carbonated water employs the apparatus. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an apparatus and method for producing carbonated water useful for, for example, hydrotherapy for the purpose of improving physiological functions.

  Carbonated water is said to be effective in treating degenerative lesions, peripheral circulation disorders, and the like. As a method for artificially producing carbonated water, for example, there is a method (bubble method) in which carbon dioxide gas is fed into the bathtub in the form of bubbles (bubble method), but this method has a low dissolution rate and a long dissolution time. In addition, there is a chemical method (drug method) in which carbonate and acid are reacted. However, this method requires a large amount of drug and cannot maintain cleanliness. In addition, there is a method (pressure injection method) in which hot water and carbon dioxide gas are pressurized and sealed in a tank for a certain period of time, but this method is not practical because the apparatus becomes large.

  Moreover, the commercially available apparatus for producing carbonated water is usually for producing carbonated water having a low carbon dioxide concentration of about 100 to 140 ppm, and does not have means for controlling the carbon dioxide concentration.

  On the other hand, Patent Document 1 describes a method in which carbon dioxide gas is supplied through a hollow fiber semipermeable membrane and absorbed in warm water. Further, Patent Document 2 describes a method of adjusting the carbon dioxide supply amount to the carbon dioxide dissolver by installing a pH sensor in the bathtub in order to keep the carbon dioxide concentration in the bathtub constant. Further, Patent Document 3 calculates the carbon dioxide concentration data of carbonated water generated from the measured pH value of carbonated water and the alkalinity value of raw water, and the carbon dioxide gas so that the carbon dioxide concentration of carbonated water becomes a target value. A method for adjusting the feed rate is described. These are methods using a so-called one-pass type apparatus that produces carbonated water by passing raw water once through a carbon dioxide gas dissolver equipped with a hollow membrane.

  In this one-pass type device, in order to produce high-concentration carbonated water excellent in physiological effects (such as increased blood flow), the membrane area of the hollow membrane is increased or the pressure of carbon dioxide gas is increased. There is a need. However, when the membrane area is increased, the apparatus becomes larger and the cost increases. Moreover, when a gas pressure is made high, a dissolution rate will fall. Furthermore, in a one-pass type device, piping / hose connection between hot water such as tap water and the device is indispensable, so it is necessary to set each time the device is moved and used in each place.

  On the other hand, according to a so-called circulation type apparatus in which hot water in a bathtub is circulated through a carbon dioxide dissolver by a circulation pump, highly concentrated carbonated water can be produced efficiently and at low cost. In addition, connection work like a one-pass type device is unnecessary, and since it can be used simply by storing hot water in a bathtub and turning on the carbonated water circulation hose of the device, setting is very simple. Examples of such a circulation type carbonated water device include those described in Patent Document 2 and Patent Document 4.

JP-A-2-279158 JP-A-8-215270 WO 98/34579 pamphlet JP-A-8-215270

  An object of the present invention is to realize a more practical circulation-type carbonated water production apparatus, and to produce carbonated water having a desired carbon dioxide gas concentration (particularly a high concentration capable of obtaining a physiological effect) at low cost and in a simple manner. It is to provide an apparatus and method that can be manufactured by operation.

  The present invention provides a flow rate of raw water and a supply pressure of carbon dioxide in advance in a carbonated water production apparatus that dissolves carbon dioxide in raw water by supplying carbon dioxide while flowing raw water into the membrane-type carbon dioxide dissolver. Correlation data with the carbon dioxide concentration of carbonated water is recorded, the flow rate of raw water is detected during the production of carbonated water, and based on the correlation data, carbon dioxide gas is obtained so that the obtained carbonated water has a target carbon dioxide gas concentration. It is a carbonated water manufacturing apparatus characterized by including the means to adjust the supply pressure of this.

  Furthermore, the present invention provides a carbonated water production method in which carbon dioxide gas is supplied while flowing raw water into a membrane-type carbon dioxide gas dissolver to dissolve the carbon dioxide gas in the raw water. Correlation data with the carbon dioxide concentration of carbonated water is recorded, the flow rate of raw water is detected during the production of carbonated water, and based on the correlation data, the carbon dioxide gas concentration is adjusted so that the obtained carbonated water has the target carbon dioxide concentration. A method for producing carbonated water characterized by adjusting a supply pressure.

  According to the present invention, complicated control is not required, the configuration of the apparatus can be greatly simplified, and carbonated water having a target carbon dioxide gas concentration can be easily produced in a small size and at low cost.

  In particular, the present invention can be applied to the case where raw water is supplied from a tap, and the apparatus is compact. Therefore, the present invention is very useful as a water treatment apparatus that can easily accommodate existing bathtubs, including bathtubs in the home. It is.

  Hereinafter, preferred embodiments of the present invention will be described.

  FIG. 1 is a flow sheet showing an example when the circulating carbonated water producing apparatus of the present invention is used. In this example, hot water in the bathtub (water tank) 11 is circulated. In the present invention, the temperature of the water in the bathtub 11 is not particularly limited. However, a temperature around or below the body temperature is preferable because the physiological effect of carbonated water is exhibited and an extra burden is not imposed on the body and the affected part. Specifically, about 32-42 degreeC is preferable.

  In this example, the water in the bathtub 11 is circulated. Applying the device of the present invention to a bathtub in this way is a very useful example. However, the present invention is not limited to this. The present invention can also be applied to water tanks other than bathing baths, for example, water storage tanks or water supply tanks that need to be filled with a desired concentration of carbonated water.

  Moreover, the water which is the object to be circulated in the present invention is not particularly limited. If water containing no carbon dioxide gas is circulated before being circulated, carbonated water whose carbon dioxide concentration is gradually increased will circulate. Further, the carbon dioxide concentration can be recovered to a high level by circulating the carbonated water having a low carbon dioxide concentration.

  In the example shown in FIG. 1, the hot water in the bathtub 11 is sucked up by the circulation pump 1, guided to the carbon dioxide gas dissolver 3 through the prefilter 2 for trapping dust in the hot water, and returned to the bathtub 11 again. . On the other hand, carbon dioxide gas is supplied from the carbon dioxide gas cylinder 4 into the carbon dioxide gas dissolver 3 through the pressure reducing valve 5 and the electromagnetic valve 6 which is a carbon dioxide gas cutoff valve.

  The carbon dioxide gas dissolver 5 is a membrane-type carbon dioxide gas dissolver configured with a built-in membrane module in which a hollow fiber membrane is disposed. In this example, the carbon dioxide gas supplied into the carbon dioxide dissolver 5 is guided to the outer surface of the hollow fiber membrane. On the other hand, the hot water supplied into the carbon dioxide dissolver 5 flows through the hollow portion of the hollow fiber membrane. Here, the carbon dioxide gas on the outer surface of the hollow fiber membrane comes into contact with the warm water flowing through the hollow portion of the hollow fiber membrane through the membrane surface, and the carbon dioxide gas dissolves in the warm water to produce carbonated water. Is supplied into the bathtub 11. Thus, if the hot water in the bathtub 11 is circulated by the circulation pump 1 for an arbitrary time, the bathtub 11 is filled with carbonated water having a high carbon dioxide gas concentration.

  When the carbon dioxide gas is contacted / dissolved through the membrane surface of the membrane module as in this example, the gas-liquid contact area can be increased, and the carbon dioxide gas can be dissolved with high efficiency. As such a membrane module, for example, a hollow fiber membrane module, a flat membrane module, or a spiral module can be used. In particular, the hollow fiber membrane module can dissolve carbon dioxide gas with the highest efficiency.

  The warm water in the bathtub 11 increases in carbon dioxide gas concentration with the passage of time to circulate. If the correlation data between the circulation time and the carbon dioxide gas concentration is obtained in advance, the necessary circulation time can be determined if the target carbon dioxide gas concentration and the carbon dioxide gas supply pressure are determined. However, if the amount of circulating water is not constant at all times, this correlation data cannot be used. Therefore, as the circulation pump 1, it is necessary to use a metering pump. However, according to the knowledge of the present inventors, even in the case of a metering pump, the flow rate of the pump fluctuates due to a change in the head, such as clogging of the prefilter, and the correlation data cannot be used. In addition, when the carbonated water has a high concentration, the pump stops due to bubbles.

  Therefore, in the present invention, by using a positive displacement metering pump having a self-priming performance as the circulation pump 1, a stable circulation and a constantly constant circulating water amount are realized. This positive displacement metering pump has a self-priming performance that can be started without priming during initial operation. Moreover, although the carbonated water tends to generate bubbles when the concentration is high, the positive displacement metering pump can stably supply water even in a bubble-rich state.

  In the present invention, this positive displacement metering pump, in particular, records the correlation data of the circulation flow rate of the positive displacement metering pump in advance, the gas supply pressure in the amount of water in the tank, the carbon dioxide concentration of carbonated water in the tank and the circulation time, When producing carbonated water, adjusting the circulation time based on the correlation data is very effective when the carbonated carbon dioxide concentration in the water tank is in the range of 600 ppm to 1400 ppm.

  Examples of the positive displacement metering pump having such a self-priming performance include a diaphragm pump, a screw pump, a tube pump, and a piston pump. Among current commercial products, a diaphragm pump is most suitable in terms of price, capacity, size, and the like. Specifically, for example, a 3-head diaphragm pump manufactured by SHURflo (USA), a 5-head diaphragm pump manufactured by Aquatec Water System (USA), a 4-head diaphragm pump manufactured by FLOJET (USA), and the like can be used. These commercial products are usually sold as booster pumps in beverage filtration devices. That is, these commercially available products are unrelated to the carbonated water production apparatus.

  The pressure of carbon dioxide gas supplied to the carbon dioxide dissolver 3 is set by the pressure reducing valve 5. The lower the pressure, the lower the generation of undissolved gas in the carbon dioxide gas dissolver 3, and the higher the dissolution efficiency. Further, the carbon dioxide gas permeation amount of the hollow fiber membrane in the carbon dioxide gas dissolver 3 is proportional to the carbon dioxide gas supply pressure, and the permeation amount increases as the pressure increases. From these points and the point that the production time becomes longer as the carbon dioxide pressure becomes lower, it is appropriate that the pressure is about 0.01 to 0.3 MPa. The amount of carbon dioxide gas absorbed in the circulating hot water also depends on the carbon dioxide concentration of the warm water and the amount of circulating water. When carbon dioxide gas exceeding the absorption amount is supplied, it becomes undissolved gas.

  When a hollow fiber membrane is used for the carbon dioxide gas dissolver 5, any hollow fiber membrane may be used as long as it has excellent gas permeability, and it may be a porous membrane or a non-porous gas permeable membrane. (Hereinafter abbreviated as “non-porous membrane”). As the porous hollow fiber membrane, those having a surface opening pore diameter of 0.01 to 10 μm are preferable. A hollow fiber membrane including a non-porous membrane is also preferably used. The most preferable hollow fiber membrane is a composite hollow fiber membrane having a three-layer structure in which both sides of a thin non-porous layer are sandwiched between porous layers. Specific examples thereof include a three-layer composite hollow fiber membrane (MHF, trade name) manufactured by Mitsubishi Rayon Co., Ltd. FIG. 2 is a schematic view showing an example of such a composite hollow fiber membrane. In the example shown in FIG. 3, the non-porous layer 19 is formed as a very thin film having excellent gas permeability, and the porous layer 20 is formed on both sides thereof, and the non-porous layer 19 is damaged. It is protected from receiving.

  Here, the non-porous layer (membrane) is a membrane that allows gas to permeate through a dissolution / diffusion mechanism into the membrane substrate, and substantially includes pores through which gas can pass in a gaseous state like a Knudsen flow. Anything that doesn't exist is acceptable. Using this non-porous membrane, gas can be supplied and dissolved without releasing carbon dioxide as bubbles in warm water, so efficient dissolution is possible, and it can be easily dissolved at any concentration with good controllability. Can do. Further, there is no reverse flow that occurs rarely in the case of a porous membrane, that is, warm water does not flow back to the gas supply side through the pores.

  The film thickness of the hollow fiber membrane is preferably 10 to 150 μm. If the film thickness is 10 μm or more, it tends to show sufficient film strength. Moreover, if it is 150 micrometers or less, it exists in the tendency which shows the permeation | transmission rate and dissolution efficiency of a sufficient carbon dioxide gas. In the case of a three-layer composite hollow fiber membrane, the thickness of the non-porous membrane is preferably 0.3 to 2 μm. When the thickness is 0.3 μm or more, the film is hardly deteriorated, and a leak due to the film deterioration is hardly generated. Moreover, if it is 2 micrometers or less, it exists in the tendency which shows sufficient permeation | transmission rate and dissolution efficiency of a carbon dioxide gas.

Further, for example, a hollow fiber membrane of the membrane one passing water to 0~30L / min per, when the gas pressure and 0.01Mpa～0.3Mpa, membrane area is preferably much as 0.1m ² ~15m ^2.

  As the membrane material of the hollow fiber membrane, for example, materials such as silicone, polyolefin, polyester, polyamide, polysulfone, cellulose, polyurethane and the like are preferable. As the material for the non-porous membrane of the three-layer composite hollow fiber membrane, polyurethane, polyethylene, polypropylene, poly-4-methylpentene-1, polydimethylsiloxane, polyethylcellulose, polyphenylene oxide and the like are preferable. Of these, polyurethane is particularly preferred because it has good film-forming properties and little eluate.

  The inner diameter of the hollow fiber membrane is preferably 50 to 1000 μm. If the inner diameter is 50 μm or more, the flow resistance of the fluid flowing in the hollow fiber membrane is appropriately reduced, and the fluid can be easily supplied. If the thickness is 1000 μm or less, the size of the dissolver can be reduced, which is advantageous in terms of downsizing the apparatus.

  When a hollow fiber membrane is used in a carbon dioxide gas dissolver, carbon dioxide gas is supplied to the hollow side of the hollow fiber membrane, hot water is supplied to the outer surface side to dissolve the carbon dioxide gas, and the outer surface side of the hollow fiber membrane There is a method in which carbon dioxide gas is supplied and hot water is supplied to the hollow side to dissolve the carbon dioxide gas. Among these, the latter method is particularly preferable because carbon dioxide gas can be dissolved at a high concentration in warm water regardless of the form of the membrane module.

  As the carbon dioxide dissolver used in the present invention, a carbon dioxide dissolver having an aeration means in which an air diffuser made of a porous material is installed at the bottom of the carbon dioxide dissolver can be used. The material and shape of the porous body arranged in the diffuser portion may be any, but the porosity, that is, the volume ratio of the voids existing in the porous body itself to the whole porous body is What is 5-70 vol% is preferable. In order to further increase the dissolution efficiency of carbon dioxide gas, a lower porosity is suitable, and it is more preferably 5 to 40 vol%. If the porosity is 70 vol% or less, the flow rate of carbon dioxide gas can be easily controlled, the gas flow rate can be reduced appropriately, and the dissolution efficiency can be improved without enlarging the bubbles of carbon dioxide gas diffused from the diffused gas. It is hard to decline. Moreover, if the porosity is 5 vol% or more, a sufficient supply amount of carbon dioxide gas can be maintained, and dissolution of carbon dioxide gas tends to take a relatively short time.

  Moreover, it is preferable that the opening hole diameter in the surface of a porous body is 0.01-10 micrometers in order to control the flow volume of the carbon dioxide gas to diffuse and to form a fine bubble. When the pore diameter is 10 μm or less, bubbles rising in water are appropriately reduced, and the dissolution efficiency of carbon dioxide gas is improved. Further, if the thickness is 0.01 μm or more, the amount of air diffused into the water is increased moderately, and even when a high concentration carbonated water is obtained, a relatively short time is required.

  The larger the surface area of the porous body arranged in the air diffuser of the air diffuser, the more bubbles can be generated, the contact between the carbon dioxide gas and the raw water proceeds efficiently, and the dissolution before the bubbles are generated is also possible. As a result, dissolution efficiency increases. Therefore, although it does not stick to the shape of the porous body, one having a large surface area is preferable. As a means for increasing the surface area, there are various methods such as making the porous body into a cylindrical shape or making the surface uneven by making it into a flat plate shape, but it is preferable to use a porous hollow fiber membrane, In particular, it is effective to use a bundle of many porous hollow fiber membranes.

  Examples of the material of the porous body include various materials such as metal, ceramic, and plastic, but are not particularly limited. However, a hydrophilic material is not preferable because warm water enters the aeration means from the pores on the surface when the supply of carbon dioxide gas is stopped.

  In the case where carbon dioxide gas is supplied to the outer surface side of the hollow fiber membrane and hot water is supplied to the hollow side to dissolve the carbon dioxide gas, a pipe for backflow cleaning may be provided. When scale accumulates at the end of the potting opening corresponding to the supply port to the hollow portion of the hollow fiber membrane, the scale can be removed relatively easily by backflow cleaning.

  Regarding the carbonated water produced according to the present invention, the concentration of carbon dioxide gas is not particularly limited. In the above-described example, if the desired carbon dioxide concentration value is input to the apparatus, and the hot water in the bathtub 11 is circulated by the circulation pump 1, the apparatus is automatically activated according to the desired carbon dioxide concentration. Since the circulation time is adjusted, carbonated water having a desired carbon dioxide concentration is filled in the bathtub 11.

  However, in order to obtain a sufficient medical physiological effect, the carbon dioxide concentration of carbonated water generally needs to be 600 ppm or more. From this point, it is preferable that the carbon dioxide concentration of the carbonated water produced in the present invention is 600 ppm or more. On the other hand, the higher the carbon dioxide gas concentration is, the lower the carbon dioxide dissolution efficiency is, and the physiological effect becomes flat at a certain concentration or higher. From this point, the upper limit of the carbon dioxide gas concentration is reasonable about 1400 ppm.

  The carbonated water production apparatus of the present invention can be further provided with a bubble generating device or a pressure injection device. The bubble generation device generates bubbles in the bath water, and the pressure injection device generates a water flow in the bath water, thereby giving physical stimulation to the affected area of the body and promoting blood circulation by its massage effect. It is intended to relieve back pain, stiff shoulders, and muscle fatigue. Such devices are currently sold by various companies and are widely used in hospitals, health facilities and homes.

  On the other hand, the carbonated water produced according to the present invention has the effect of transcutaneously absorbing carbon dioxide in the water and expanding blood vessels to promote blood circulation. In other words, if the action by bubbles or pressure injection is a dynamic action, the action by carbonated water can be said to be a static action. The treatment with carbonated water has the advantage that there is no physical irritation compared to the bubble generating device and the pressure injection device, and there is no unreasonable burden on the body and the affected area and there are few side effects.

  In the example shown in FIG. 1, the apparatus for producing carbonated water according to the present invention is further provided with a bubble generating device and unitized into one package, thereby providing a multi-function device capable of performing both functions with one device. The bubble generating device is composed of a diffuser plate 9 disposed at the lower part of the bathtub at least in use, a compressor 8 for supplying air to the diffuser plate 9, and a pipe communicating the both. By starting the compressor 9, bubbles are generated from the diffuser plate 8 and give physical stimulation to the affected area of the bather.

  However, in such a multi-function device, it is preferable not to generate bubbles when the bathtub is filled with carbonated water. This is because the inside of the bathtub is disturbed by the bubbles, and the carbon dioxide dissolved in the carbonated water tends to evaporate in the air, and the concentration of the carbonated water tends to drastically decrease in an instant. For this reason, it is preferable that the carbonated water production function and the bubble generation function are not used in combination, but are provided separately with a changeover switch.

  FIG. 3 shows an example of another multifunctional device of the carbonated water production apparatus of the present invention. This pressure injection device includes at least a jet nozzle 10 disposed in a bathtub 11 at the time of use, an ejector 12 that sucks in air supplied to the jet nozzle 10, and a pipe that communicates the two. A water flow or bubbles are generated from the jet nozzle 10 to give a physical stimulus to the affected area of the bather. This water flow or bubble generation function is not performed in combination with carbonated water production, but is switched by the switching valve 13 and performed separately.

  In the apparatus shown in FIG. 1, automatic water draining means is further provided. Specifically, the automatic water draining means includes a drain drain pipe for the hollow fiber membrane in the carbon dioxide dissolver 3 and an electromagnetic valve (open valve) 7 arranged in the middle of the pipe. In the carbon dioxide gas dissolver 3, water vapor evaporated from the hollow portion of the hollow fiber membrane is condensed at the outer portion of the hollow fiber membrane and the drain accumulates, and the drain blocks the membrane surface and effective gas permeation cannot be performed. There is. The automatic water draining means automatically and periodically opens the electromagnetic valve (open valve) 7 and discharges the drain accumulated in the carbon dioxide gas dissolver 3 to the outside of the apparatus.

In the example shown in FIG. 1, for example, in the carbon dioxide dissolver 3 (hollow fiber membrane area 0.6 m ² ), the electromagnetic valve 7 is opened for 1 second at the start of operation (or at the end), and the drain is discharged to the outside. To do. At this time, the carbon dioxide electromagnetic valve 6 is opened, and the drain is discharged at an appropriate gas pressure (about 0.15 Mpa). The amount of discharge to the outside during each operation is too frequent and wastes carbon dioxide. Therefore, the operation time is integrated and water is automatically drained at the start of the next operation every operation for 4 hours or more.

  In this way, by setting the time and gas pressure that match the device and automatically draining, it is not necessary to perform draining manually as in the prior art, and the effective membrane area is always available. Is ensured, and high-concentration carbonated water can be produced.

  Hereinafter, the present invention will be described more specifically with reference to examples.

<Example 1>
Using the flow sheet apparatus shown in FIG. 1, carbonated water was produced as follows. The carbon dioxide dissolver 3 uses a dissolver containing the above-mentioned three-layer composite hollow fiber membrane (trade name MHF, manufactured by Mitsubishi Rayon Co., Ltd.) with an effective total membrane area of 0.6 m ² . Carbon dioxide gas was supplied to the outer surface side, and raw water was supplied to the hollow side to dissolve the carbon dioxide gas. As the circulation pump 1, a 3-head diaphragm pump manufactured by SHURflo, which is a diaphragm type metering pump, was used.

  Then, 10 L of water filled in the bathtub 11 and hot water having a temperature of 35 ° C. were circulated by the circulation pump 1 at a flow rate of 5 L / min, and at the same time, carbon dioxide was supplied to the carbon dioxide dissolver 5 at a pressure of 0.05 MPa. Due to this circulation, the carbon gas concentration in the hot water in the bathtub 11 gradually increased. The carbon dioxide concentration was measured with an ion meter IM40S manufactured by Toa Denpa Kogyo Co., Ltd. and a carbon dioxide electrode CE-235. Table 1 shows the measurement results of the carbon dioxide concentration for each circulation time. In addition, in the production of carbonated water, draining was automatically performed by an automatic extraction function, and degassing was also appropriately performed.

  Further, carbonated water was produced in the same manner except that the carbon dioxide supply pressure was changed to 0.10 MPa and 0.15 MPa. The circulation time and carbon dioxide concentration in this case are also shown in Table 2. A graph of these is shown in FIG.

  From the data shown in Table 1, for example, if the target carbon dioxide concentration to be produced is 1000 ppm, the carbon dioxide supply pressure is 0.05 MPa, 0.10 MPa, and 0.15 MPa. The time required for this is determined as shown in Table 2.

  In the present invention, since a positive displacement metering pump having self-priming performance is used, stable circulation is possible even with carbonated water having a high concentration of about 1000 ppm. Therefore, when the gas was circulated again for the required time at the three gas supply pressures shown in Table 2, carbonated water having a high concentration of about 1000 ppm could be produced.

<Comparative Example 1>
A centrifugal pump is used as the circulation pump 1 instead of the diaphragm metering pump, and a submersible pump (spiral type) is also provided at the tip of the suction hose in the bathtub to make the pressure at the pump suction port positive. An attempt was made to produce carbonated water in the same manner as in Example 1 except that. However, before reaching high concentration carbonated water (1000 ppm), the pump stopped due to the generation of bubbles.

  Table 3 shows the time from the start of operation until the vortex pump stops due to bubble entrainment, and the carbon dioxide concentration at the time of stoppage.

  From the results shown in Table 3, it can be seen that when a centrifugal pump is used, carbonated water becomes a high concentration and the pump is stopped by bubbles, so that a high concentration of about 1000 ppm cannot be produced.

It is a flow sheet which shows an example at the time of using the circulation type carbonated water manufacturing apparatus of the present invention. It is a schematic diagram which shows an example of a three-layer composite hollow fiber membrane. It is a flow sheet which shows an example at the time of using the circulation type carbonated water manufacturing apparatus of the present invention. 3 is a graph showing the relationship between the circulation time and the carbon dioxide concentration in Example 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Circulation pump 2 Pre-filter 3 Carbon dioxide gas dissolver 4 Carbon dioxide gas cylinder 5 Pressure reducing valve 6 Electromagnetic valve 7 Electromagnetic valve 8 Compressor 9 Air diffuser plate 10 Jet nozzle 11 Bath 12 Ejector 13 Switching valve 19 Non-porous layer 20 Porous layer

Claims (6)

  In a carbonated water production apparatus that feeds carbon dioxide gas while flowing raw water into the membrane-type carbon dioxide gas dissolver and dissolves carbon dioxide gas in the raw water, the flow rate of the raw water, the supply pressure of the carbon dioxide gas, and the carbonated water of the obtained carbonated water Correlation data with gas concentration is recorded, the flow rate of raw water is detected during the production of carbonated water, and the supply pressure of carbon dioxide gas is adjusted based on the correlation data so that the obtained carbonated water has the target carbon dioxide gas concentration. An apparatus for producing carbonated water, comprising means for adjusting.   The carbonated water manufacturing apparatus according to claim 1, wherein the membrane of the membrane-type carbon dioxide gas dissolver includes a non-porous gas permeable membrane.   Furthermore, the carbonated water manufacturing apparatus of Claim 1 provided with a bubble generator or a pressure injection apparatus.   Furthermore, the carbonated water manufacturing apparatus of Claim 1 provided with an automatic water extraction means.   In a carbonated water production method in which carbon dioxide gas is supplied while flowing raw water into a membrane-type carbon dioxide gas dissolver, and carbon dioxide gas is dissolved in the raw water, the flow rate of the raw water, the supply pressure of the carbon dioxide gas, and the carbonated water of the obtained carbonated water Record the correlation data with gas concentration, detect the flow rate of raw water at the time of carbonated water production, and adjust the supply pressure of carbon dioxide gas so that the obtained carbonated water becomes the target carbon dioxide concentration based on the correlation data The manufacturing method of carbonated water characterized by the above-mentioned.   The method for producing carbonated water according to claim 5, wherein the target carbon dioxide concentration is in the range of 600 ppm to 1400 ppm.

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