JP5119557B2 - Production method of carbonated water - Google Patents

Description

The present invention relates to the production how carbonated water suitably used for carbonated bath.

  The carbonate bath is said to be effective in treating degenerative lesions, peripheral circulatory disorders, etc. due to its blood circulation promoting action. Various methods and apparatuses for producing carbonated water for such carbonated baths have been proposed.

  For example, Japanese Patent Application Laid-Open No. 2001-293344 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2004-305286 (Patent Document 2) describe a method and an apparatus for producing carbonated water in which carbonated water is obtained by dissolving carbon dioxide in water. Is disclosed. In particular, Japanese Patent Laid-Open No. 2001-293344 (Patent Document 1) discloses a method of dissolving carbon dioxide gas from a carbon dioxide cylinder in water using a membrane-type carbon dioxide dissolver such as a hollow fiber membrane (the carbon dioxide gas produced by the membrane) Dissolution method) is disclosed. Japanese Patent Laying-Open No. 2004-305286 (Patent Document 2) discloses a method of dissolving carbon dioxide gas from a carbon dioxide gas cylinder as fine bubbles using an injector (a method for dissolving carbon dioxide gas using fine bubbles). .

  Japanese Patent Application Laid-Open No. 08-196456 (Patent Document 3), Japanese Patent Application Laid-Open No. 08-196880 (Patent Document 4) and Japanese Patent Application Laid-Open No. 08-252192 (Patent Document 5) are disclosed in Japanese Patent Application Laid-Open No. 08-252192. By electrolyzing water using an electrode for electrolysis constructed using a carbonaceous electrode, carbon dioxide gas is generated in the carbonaceous electrode and dissolved in water (carbon gas by electrolysis of water using a carbonaceous electrode) The production method and the production apparatus of carbonated water for obtaining carbonated water by the generation and dissolution of the above are disclosed.

JP 2001-293344 A JP 2004-305286 A Japanese Patent Laid-Open No. 08-196456 Japanese Patent Laid-Open No. 08-196880 Japanese Patent Laid-Open No. 08-252192

  However, the method for dissolving carbon dioxide gas using a membrane disclosed in Japanese Patent Application Laid-Open No. 2001-293344 (Patent Document 1) has a problem that the membrane is clogged due to generation of scale and / or bacteria and the carbon dioxide gas cannot be dissolved. In addition, the method for dissolving carbon dioxide gas using fine bubbles disclosed in Japanese Patent Application Laid-Open No. 2004-305286 (Patent Document 2) has a problem that a large apparatus is required and the production cost of carbon dioxide gas is high. Further, water using a carbonaceous electrode disclosed in Japanese Patent Application Laid-Open No. 08-196456 (Patent Document 3), Japanese Patent Application Laid-Open No. 08-196880 (Patent Document 4) and Japanese Patent Application Laid-Open No. 08-252192 (Patent Document 5). The method of obtaining carbonated water by generating and dissolving carbon gas by electrolysis has a problem that it is difficult to produce high-concentration carbonated water suitable for a carbon bath.

Accordingly, the present invention is to solve the above problems, and an object thereof is to provide a manufacturing how the carbonated water can be efficiently produced a high concentration of carbonated water.

The present invention includes a step of flowing water into an electrolytic cell in which an anode containing carbon and a cathode are disposed, and a frequency of 10 kHz to 1000 MHz and a duty ratio of 0.2 to 0.8 intermittently. A method for producing carbonated water comprising: applying a DC voltage between an anode and a cathode to dissolve carbonated gas generated in the anode in water to obtain carbonated water. Here, the anode may further contain iridium.

According to the present invention, it is possible to provide a manufacturing how the carbonated water can be efficiently produced a high concentration of carbonated water.

It is the schematic which shows an example of the manufacturing method and manufacturing apparatus of carbonated water concerning this invention. It is the schematic which shows the example of the sequence of the voltage applied between the anode and cathode used in the manufacturing method and manufacturing apparatus of carbonated water in this invention. Here, (A) shows a square wave pattern, and (B) shows a curved wave pattern. It is the schematic which shows an example of the carbonic acid bath apparatus concerning this invention. It is a graph which shows a time-dependent change of the free carbonic acid density | concentration in an Example. It is a graph which shows the time-dependent change of the free chlorine concentration in an Example.

(Embodiment 1)
Referring to FIG. 1, an apparatus for producing carbonated water according to an embodiment of the present invention is intermittently generated at an electrolytic cell 10 in which an anode 11 containing carbon and a cathode 13 are disposed, and at a frequency of 10 kHz to 1000 MHz. And a power supply unit 20 for applying a voltage between the anode 11 and the cathode 13. Since the carbonated water manufacturing apparatus of the present embodiment includes the electrolytic cell 10 and the power supply unit 20, the diameter of the gas bubbles of carbon dioxide gas generated at the anode can be reduced from nm order to μm order. A high concentration carbonated water with a high free carbonate concentration can be produced. Details will be described below.

The apparatus for producing carbonated water of this embodiment includes an electrolytic cell 10 in which an anode 11 containing carbon and a cathode 13 are arranged. When water is electrolyzed in the electrolytic cell 10, the carbon contained in the anode 11 is oxidized in the anode 11 to generate carbon dioxide gas (carbon dioxide gas), and the generated carbon dioxide gas dissolves in water. Carbonated water containing can be obtained. Here, free carbonic acid means carbon dioxide present in water as dissolved carbon gas (CO ₂ ).

At this time, if chloride ions (Cl ⁻ ) are present in the water, the chloride ions are also oxidized at the anode 11 to generate chlorine gas (Cl ₂ ), and the chlorine gas is dissolved in the water. Free chlorine. Here, the free chlorine refers to chlorine existing in water as at least one of dissolved chlorine gas (Cl ₂ ), hypochlorous acid (HOCl), and hypochlorite ion (OCl ⁻ ). The free chlorine reacts with water to generate active oxygen such as singlet oxygen gas ( ¹ O ₂ ). Here, the active oxygen, oxygen means a chemical species that become chemically active, another singlet oxygen gas, hydrogen peroxide (HOOH), superoxide anion radicals (O ₂ · ^-), hydroxy radicals ( HO.) And the like are included. That is, when water containing chloride ions (for example, tap water) is electrolyzed, free chlorine and active oxygen having high chemical activity are generated in addition to free carbonic acid. For this reason, the bactericidal effect by free chlorine and active oxygen can also be expected.

  The free carbonic acid concentration can be measured by a strontium chloride-hydrochloric acid titration method defined in JIS K0101: 1998. The free chlorine concentration can be measured by a diethyl-p-phenylenediamine (DPD) colorimetric method defined in JIS K0101: 1998. The active oxygen concentration can be measured by an ESR (electron spin resonance) method, a luminol light emission reaction method using light emission by a reaction between luminol and active oxygen, and the like.

  Here, the anode 11 containing carbon is not particularly limited as long as it is an electrode containing carbon, but from the viewpoint of efficiently generating carbon dioxide gas and suppressing impurities from being contained in water, the carbon content High is preferred. For example, it is preferable to use the carbon electrode 11a. Moreover, in order to suppress the embrittlement by electrolysis, this carbon electrode 11a may be reinforced with various binders.

  The anode 11 preferably contains iridium in addition to carbon. The anode 11 containing carbon may be embrittled by generating carbon dioxide on the anode by electrolysis of water, resulting in embrittlement and carbon flowing out into water. In such a case, if iridium is present in the anode, the above carbon is also oxidized and carbon dioxide gas is generated by the oxidization action of iridium. For this reason, while the efficiency in which the carbon in the anode 11 is converted into carbon dioxide gas becomes high, the amount of carbon flowing out into water is also reduced. The anode 11 containing carbon and iridium is not particularly limited, and the iridium electrode 11b may be provided together with the carbon electrode 11a, or a composite material such as an alloy of carbon and iridium may be used.

  Although there is no restriction | limiting in particular in the cathode 13, From a low cost and a viewpoint with high corrosion resistance, what contains stainless steel, copper, iron, etc. is preferable. Specifically, the cathode 13 is preferably a stainless steel electrode, a copper electrode, an iron electrode, or the like.

  The electrolytic cell 10 is provided with a water inflow pipe 15 and an outflow pipe 17, and the inflow pipe 15 and the outflow pipe 17 are provided with valves 15 v and 17 v, respectively. Water is caused to flow into the electrolytic cell 10 by opening the valve 15v, and carbon dioxide gas is generated at the anode 11 by electrolyzing water by intermittently applying a direct current between the anode and the cathode containing carbon. The generated carbon dioxide gas is dissolved in water to obtain carbonated water. The carbonated water thus obtained flows out from the outflow pipe 17 by opening the valve 17v.

  Moreover, the carbonated water manufacturing apparatus of the present embodiment includes a power supply unit 20 that applies a DC voltage between the anode 11 and the cathode 13 intermittently at a high frequency of 10 kHz to 1000 MHz.

  By intermittently applying a voltage between the anode 11 and the cathode 13 at a frequency of 10 kHz or more and 1000 MHz or less, the diameter of the gas bubbles of carbon dioxide gas generated at the anode 11 can be reduced from nm order to μm order. it can. That is, when the voltage is intermittently applied between the anode 11 and the cathode 13 at a frequency of 10 kHz or more and 1000 MHz or less, carbon dioxide gas is applied to the anode 11 when a voltage is applied between the anode 11 and the cathode 13. When carbon dioxide gas bubbles grow and no voltage is applied between the anode 11 and the cathode 13, a reverse voltage is generated between the anode 11 and the cathode 13, and the carbon dioxide gas grown on the anode 11 is generated. Gas bubbles separate from the anode 11. That is, by adjusting the frequency of the voltage intermittently applied between the anode 11 and the cathode 13 to 10 kHz or more and 1000 MHz or less, the diameter of the gas bubbles of carbon dioxide gas generated at the anode is in a fine range from 1 nm to 100 μm. Can be adjusted. From this viewpoint, the frequency at which the voltage is intermittently applied between the anode 11 and the cathode 13 is preferably 500 kHz or more and 100 MHz or less, and more preferably 1 MHz or more and 10 MHz or less. In addition, the diameter of the gas bubble of a carbon dioxide gas can be measured with a nanoparticle size distribution measuring device (preferably a nanoparticle size distribution measuring device by a dynamic light scattering method).

  In addition, it is preferable to further adjust the duty ratio in addition to the frequency from the viewpoint of adjusting the diameter of the gas bubbles of carbon dioxide gas generated at the anode in a fine range with higher accuracy. Here, referring to FIG. 2, the duty ratio D is a period in which the phenomenon continues in a certain period (period T of the function) in a periodic phenomenon (period τ in which the function is not 0). The ratio is expressed by D = τ / T. For example, in an ideal pulse train (square wave pulse) as shown in FIG. 2A, the duty ratio D is obtained by dividing the pulse width (period τ in which the function is not 0) by the pulse period (function period T). It is. Since there is a relationship of f = 1 / T between the frequency f and the period T, it is expressed as D = τ / T = τ · f. The duty ratio is not particularly limited, but is preferably 0.2 (20%) or more and 0.8 (80%) or less, and 0.4 (40%) or more is 0.6 (60%) from the above viewpoint. The following is more preferable.

  Here, the power supply unit 20 that intermittently applies a voltage between the anode 11 and the cathode 13 at a frequency of 10 kHz to 1000 MHz is not particularly limited. For example, the DC power supply 29, the switch 27, and the switch 27, a frequency setting circuit 21 and a duty ratio setting circuit 23 for setting an on-off frequency and a duty ratio, respectively, and a switch control circuit 25 for turning on and off the switch 27 in accordance with the set frequency and duty ratio. And including. In this way, when the frequency f and the duty ratio D are set, the square wave (pulse) period T as shown in FIG. 2A is T = 1 / f and the square wave (pulse) width τ is τ = D · A constant voltage can be intermittently applied between the anode 11 and the cathode 13 by turning the switch on and off in response to a square wave of T = D / f.

  In FIG. 1, the DC power supply 29 and the switch 27 are used, but instead of these, an AC power supply and a rectifier (not shown) are used to set the frequency f and the duty ratio D, for example, a half wave. When rectified, the anode 11 is intermittently corresponding to a curved wave having a curved wave period T of T = 1 / f and a curved wave width τ of τ = D · T = D / f as shown in FIG. A voltage can be applied between the cathode 13 and the cathode 13.

(Embodiment 2)
Referring to FIG. 1, the method for producing carbonated water according to another embodiment of the present invention includes a step of flowing water into an electrolytic cell 10 in which an anode 11 and a cathode 13 containing carbon are disposed, and 10 kHz or more. And a step of intermittently applying a voltage between the anode 11 and the cathode 13 at a frequency of 1000 MHz or less to dissolve carbon dioxide generated in the anode 11 in water to obtain carbonated water. In the method for producing carbonated water of the present embodiment, water that has flowed into the electrolytic cell 10 in which the anode 11 and the cathode 13 containing carbon are disposed is intermittently generated at a frequency of 10 kHz to 1000 MHz. When the electrolysis is performed by applying a voltage between and the carbon dioxide gas bubbles generated at the anode 11, the diameter of the gas bubbles can be reduced from the nm order to the μm order. Can produce water. Details will be described below.

  There is no restriction | limiting in particular in the manufacturing method of carbonated water of this embodiment, For example, it can carry out using the manufacturing apparatus of carbonated water of Embodiment 1.

  The method for producing carbonated water according to the present embodiment includes a step of flowing water into the electrolytic cell 10 in which the anode 11 and the cathode 13 containing carbon are arranged. The method for inflow of water into the electrolytic cell 10 is not particularly limited. For example, the valve 15v can be opened to allow water to flow into the electrolytic cell 10 through the inflow pipe 15.

  In the method for producing carbonated water according to the present embodiment, by intermittently applying a voltage between the anode 11 and the cathode 13 at a frequency of 10 kHz or more and 1000 MHz or less, the carbon dioxide gas generated at the anode 11 is dissolved in water. A step of obtaining carbonated water.

When a voltage is applied between the anode 11 containing carbon and the cathode 13 in the electrolytic cell 10 into which water has flowed, in the anode 11, as shown in the following formula (1),
C + O ₂ → CO ₂ (1)
Carbon contained in the anode 11 is oxidized to generate carbon dioxide (carbon dioxide gas), and the generated carbon dioxide dissolves in water, whereby carbonated water containing free carbon dioxide is obtained.

At this time, if chloride ion (Cl ⁻ ) is present in the water, as shown in the following formula (2):
2Cl ⁻ → Cl ₂ + 2e ⁻ (2)
Chloride ions are oxidized at the anode 11 to generate chlorine gas (Cl ₂ ), which is dissolved in water to become free chlorine.

Furthermore, as shown in the following equation (3),
Cl ₂ + H ₂ O → 2HCl + 1 / 2O ₂ (3)
The above free chlorine reacts with water to generate active oxygen such as singlet oxygen gas ( ¹ O ₂ ).

  That is, when water containing chloride ions (for example, tap water) is electrolyzed, free chlorine and active oxygen gas having high chemical activity are generated in addition to free carbon dioxide gas. For this reason, the bactericidal effect by free chlorine and active oxygen can also be expected.

  The method for measuring the concentration of free carbonic acid, free chlorine and active oxygen is as described in the first embodiment.

  Here, by intermittently applying a voltage between the anode 11 and the cathode 13 at a frequency of 10 kHz or more and 1000 MHz or less, the diameter of the gas bubbles of the carbon dioxide gas generated at the anode 11 is reduced from the nm order to the μm order. can do. That is, when voltage is intermittently applied between the anode 11 and the cathode 13 at a frequency of 10 kHz or more and 1000 MHz or less, carbon dioxide gas is generated at the anode 11 when voltage is applied between the anode 11 and the cathode 13. If a gas bubble of carbon dioxide gas grows and no voltage is applied between the anode 11 and the cathode 13, a reverse voltage is generated between the anode 11 and the cathode 13, and the gas bubble of carbon dioxide gas grown on the anode 11 grows. Separate from the anode 11. That is, by adjusting the frequency of the voltage applied intermittently between the anode 11 and the cathode 13 to 10 kHz or more and 1000 MHz or less, the diameter of the gas bubbles of carbon dioxide gas generated at the anode 11 can be reduced from 1 nm to 100 μm. The range can be adjusted. From this viewpoint, the frequency at which the voltage is intermittently applied between the anode 11 and the cathode 13 is preferably 500 kHz or more and 100 MHz or less, and more preferably 1 MHz or more and 10 MHz or less. The method for measuring the diameter of carbon dioxide gas bubbles is as described in the first embodiment.

  In addition, it is preferable to further adjust the duty ratio in addition to the frequency from the viewpoint of adjusting the diameter of the gas bubbles of carbon dioxide gas generated at the anode in a fine range with higher accuracy. Here, referring to FIG. 2, the duty ratio D is a period in which the phenomenon continues in a certain period (period T of the function) in a periodical phenomenon, as in the first embodiment. It means the ratio of (period τ where the function is not 0), and is expressed as D = τ / T. For example, in an ideal pulse train (square wave pulse) as shown in FIG. 2A, the duty ratio D is obtained by dividing the pulse width (period τ in which the function is not 0) by the pulse period (function period T). It is. Since there is a relationship of f = 1 / T between the frequency f and the period T, it is expressed as D = τ / T = τ · f. The duty ratio is not particularly limited, but is preferably 0.2 (20%) or more and 0.8 (80%) or less, and 0.4 (40%) or more is 0.6 (60%) from the above viewpoint. The following is more preferable.

  Here, the method of intermittently applying a voltage between the anode 11 and the cathode 13 at a frequency of 10 kHz or more and 1000 MHz or less is not particularly limited. For example, the DC power supply 29, the switch 27, and the switch 27 A frequency setting circuit 21 and a duty ratio setting circuit 23 for setting the on-off frequency and the duty ratio, respectively, and a switch control circuit 25 for turning on and off the switch 27 corresponding to the set frequency and duty ratio. When the frequency f and the duty ratio D are set using the power supply unit 20 including the square wave (pulse) period T as shown in FIG. Is applied intermittently between the anode 11 and the cathode 13 by turning on and off the switch in response to a square wave with τ = D · T = D / f. be able to.

  In FIG. 1, the DC power supply 29 and the switch 27 are used, but instead of these, an AC power supply and a rectifier (not shown) are used to set the frequency f and the duty ratio D, for example, a half wave. When rectified, the anode 11 is intermittently corresponding to a curved wave having a curved wave period T of T = 1 / f and a curved wave width τ of τ = D · T = D / f as shown in FIG. A voltage can be applied between the cathode 13 and the cathode 13.

  As in the case of Embodiment 1, the anode 11 preferably contains iridium in addition to carbon. The anode 11 containing carbon may be embrittled by generating carbon dioxide on the anode by electrolysis of water, resulting in embrittlement and carbon flowing out into water. In such a case, if iridium is present in the anode, the above carbon is also oxidized and carbon dioxide gas is generated by the oxidization action of iridium. For this reason, while the efficiency in which the carbon in the anode 11 is converted into carbon dioxide gas becomes high, the amount of carbon flowing out into water is also reduced. The anode 11 containing carbon and iridium is not particularly limited, and the iridium electrode 11b may be provided together with the carbon electrode 11a, or an alloy of carbon and iridium may be used.

  As described above, according to the method for producing carbonated water of this embodiment, the diameter of the gas bubbles of the carbon dioxide gas generated at the anode 11 can be reduced from the nm order to the μm order. High concentration carbonated water of preferably 500 mg / l or more, more preferably 1000 mg / l or more can be produced efficiently.

  The method for producing carbonated water of the present embodiment can further include a step of causing carbonated water to flow out of the electrolytic cell 10. By this process, the obtained carbonated water can be taken out from the electrolytic cell 10. The method for flowing out water from the electrolytic cell 10 is not particularly limited. For example, the valve 15v can be opened to allow water to flow into the electrolytic cell 10 through the outflow pipe 17.

(Embodiment 3)
Referring to FIG. 3, a carbonated bath device according to still another embodiment of the present invention includes the carbonated water producing device of Embodiment 1 and a bathtub 30, and the bathtub 30 is connected to the electrolytic cell 10 with water and water. At least one of the carbonated water is configured to circulate. The carbonated bath apparatus having such a configuration can efficiently obtain carbonated water having a high free carbon dioxide concentration in the bathtub.

  There is no restriction | limiting in particular in the structure of the carbonic acid bath apparatus of this embodiment, For example, it is comprised as follows. The apparatus for producing carbonated water is the same as in the first embodiment. The bathtub 30 has an inflow pipe 35 and a valve 35v for allowing at least one of water and carbonated water to flow into the bathtub 30, and an outflow pipe 37 and a valve 37v for allowing at least one of water and carbonated water to flow out of the bathtub 30. With. Moreover, the electrolytic cell 10 and the bathtub 30 are connected as follows. That is, the valve 37 v of the outflow pipe 37 of the bathtub 30 and the valve 15 v of the inflow pipe 15 of the electrolytic cell 10 are connected by the first connection pipe 31, and the pump 39 is arranged in the middle of the first connection pipe 31. . A valve 17 v of the outflow pipe 17 of the electrolytic cell 10 and a valve 35 v of the inflow pipe 35 of the bathtub 30 are connected by a second connection pipe 33.

  In the carbonated bath device of this embodiment, the water in the bathtub 30 passes through the outflow pipe 37 of the bathtub 30, the valve 37v, the first connection pipe 31, the pump 39, the valve 15v, and the inflow pipe 15 of the electrolytic cell 10 by the pump 39. And flows into the electrolytic cell 10. Subsequently, carbonated water is produced by electrolyzing water in the electrolytic cell 10 using an anode and a cathode containing carbon as described in the second embodiment. Next, the carbonated water obtained in the electrolytic cell 10 flows into the bathtub 30 through the outflow pipe 17 of the electrolytic cell 10, the valve 17 v, the second connection pipe 33, the valve 35 v and the inflow pipe 35 of the bathtub 30. . In this way, carbonated water produced in the electrolytic cell 10 can be circulated between the bathtub 30 and the electrolytic cell 10, and the concentration of free carbonic acid in the bathtub 30 can be increased efficiently and Can be kept high. In addition, the arrow in FIG. 3 has shown the circulation direction of at least any one of water and carbonated water.

Example 1
An apparatus for producing carbonated water including an electrolytic cell 10 and a power supply unit 20 as shown in FIG. 1 was prepared. The electrolytic cell 10 had a volume of 10 l (liter), a carbon electrode 11a and an iridium electrode 11b were disposed as the anode 11, and a stainless steel (SUS) electrode was disposed as the cathode 13. Each of these electrodes has a plate shape of 3 cm × 30 cm × 5 mm in thickness. These electrodes have a distance between the main surfaces of the iridium electrode 11b and the carbon electrode 11a as the anode 11 of 0.5 cm, and between the carbon electrode 11a as the anode 11 and a stainless steel (SUS) electrode as the cathode 13. It was arrange | positioned so that the distance between main surfaces might be set to 1 cm. Further, the power supply unit 20 includes a DC power supply 29, a switch 27, a frequency setting circuit 21 that can arbitrarily set a frequency in a range from 10 kHz to 1000 MHz, and a duty ratio from 0 to 1 (from 0% to 100%). A duty ratio setting circuit 23 that can be arbitrarily set in the range of, and a switch control circuit 25 that controls on / off of the switch based on these circuits.

  After flowing 1 l of tap water from the inflow pipe 15, the frequency is set to 1 MHz and the duty ratio is set to 0.6 (60%), and a current of 1.5 A is applied between the anode 11 and the cathode 13 during energization. A voltage was applied to flow. The free carbonate concentration and free chlorine concentration of water or carbonated water in the electrolytic cell 10 were measured at 0 minutes, 10 minutes, 30 minutes and 60 minutes after voltage application. The concentration of free carbonic acid was measured by a strontium chloride-hydrochloric acid titration method defined in JIS K0101: 1998. The free chlorine concentration was measured by a diethyl-p-phenylenediamine (DPD) colorimetric method specified in JIS K0101: 1998. The concentration of free carbonic acid can be increased in a very short time from 0 to 0 mg / l after 0 minutes, 500 mg / l after 10 minutes, 800 mg / l after 30 minutes, and 1050 mg / l after 60 minutes. did it. The concentration of free chlorine was also 0.10 mg / l after 0 minutes, 0.20 mg / l after 10 minutes, 0.27 mg / l after 30 minutes, and 0.33 mg / l after 60 minutes after voltage application. It was possible to make it extremely high. The diameter of the carbon dioxide gas bubbles generated from the anode was extremely small, 10 nm to 1000 nm, as measured by a nanoparticle distribution measuring device (LS13320 manufactured by Beckman Coulter, Inc.). The results are summarized in Table 1.

(Example 2)
A voltage was applied between the anode and the cathode in the electrolytic cell in the same manner as in Example 1 except that only the carbon electrode 11a was used as the anode 11. The concentration of free carbonic acid can be increased to 0 mg / l after 0 minutes, 300 mg / l after 10 minutes, 500 mg / l after 30 minutes, and 600 mg / l after 60 minutes. It was. The concentration of free chlorine was also 0.10 mg / l after 0 minutes, 0.10 mg / l after 10 minutes, 0.15 mg / l after 30 minutes, 0.15 mg / l after 60 minutes, after voltage application. I was able to increase it to 1 Moreover, the diameter of the gas bubble of the carbon dioxide gas which generate | occur | produces from an anode was very small with 10 nm-1000 nm. In addition, with the passage of time from the voltage application, the water in the electrolytic cell became black and turbid. This is presumably because a large amount of carbon in the anode carbon electrode flowed into water before being oxidized into carbon dioxide. The results are summarized in Table 1.

  Further, based on the results in Table 1, with respect to Example 1 and Example 2, the change over time in the concentration of free carbonic acid was plotted in FIG. 4, and the change over time in the concentration of free chlorine was plotted in FIG. Referring to Table 1, FIG. 4 and FIG. 5, in Example 1, the concentrations of free carbon and free chlorine and the rate of increase were higher than in Example 2. Further, in Example 1, the black turbidity of water as seen in Example 2 was not observed. Since the anode contains iridium in addition to carbon, the oxidation efficiency of carbon contained in the anode is increased due to the oxidation action of iridium, and the generation efficiency of free carbon is increased. Conceivable. In addition, it is considered that the generation of free chlorine was promoted by the oxidizing action of iridium contained in the anode.

  DESCRIPTION OF SYMBOLS 10 Electrolyzer, 11 Anode, 11a Carbon electrode, 11b Iridium electrode, 13 Cathode, 15, 35 Inflow pipe, 15v, 17v, 35v, 37v Valve, 17, 37 Outflow pipe, 20 Power supply part, 21 Frequency setting circuit, 23 Duty Ratio setting circuit, 25 switch control circuit, 27 switch, 29 DC power supply, 30 bathtub, 31 first connection pipe, 33 second connection pipe, 39 pump.

Claims (2)

Flowing water into an electrolytic cell in which an anode containing carbon and a cathode are disposed;
By intermittently applying a DC voltage between the anode and the cathode at a frequency of 10 kHz or more and 1000 MHz or less and a duty ratio of 0.2 or more and 0.8 or less, carbon dioxide gas generated at the anode is transferred to the water. And a step of dissolving to obtain carbonated water. The method for producing carbonated water according to claim 1 , wherein the anode further contains iridium.

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