JP7212978B1 - electrolytic device - Google Patents

Abstract

The present invention provides an electrolyzer capable of simply and stably continuously producing mixed electrolyzed water containing electrolyzed hypochlorous acid at a desired pH, particularly pH 6 to 6.5, without generating wasteful waste water. The electrolyzer (100) is capable of adjusting the current flowing through the third electrode and the first electrode and/or the second electrode by means of the current load device, so that the pH of the generated oxidized water and reduced water can be adjusted. The electrolyte aqueous solution is circulated and supplied to the intermediate chamber 18, and the reference electrode potential obtained by dividing the electrolysis voltage at the beginning of operation by the voltage of the third electrode 46, and the electrolysis voltage during operation of the third electrode 46 Since the pH correction current is applied to the third electrode 46 when a predetermined difference occurs in the electrode potential during operation obtained by dividing by the voltage, the mixed electrolyzed water is maintained even if the pH of the aqueous electrolyte solution changes. It is easy to stabilize the pH of water, and wasteful drainage does not occur. [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to an electrolyzer for obtaining electrolyzed water (including reduced water and oxidized water) by electrolyzing water.

The apparatus for producing electrolyzed water includes a one-chamber type without a diaphragm, a two-chamber type divided into two chambers by one diaphragm, and a three-chamber type divided into three chambers, an anode chamber, an intermediate chamber, and a cathode chamber. There is In the three-chamber type electrolytic device, electrodes and ion-exchange membranes are arranged between the anode chamber and the intermediate chamber, and between the cathode chamber and the intermediate chamber, respectively. The three-chamber electrolyzer is said to be capable of efficiently electrolyzing water.

In the conventional three-chamber electrolysis apparatus, the water molecules (H ₂ O) of the water supplied to the anode chamber are oxidized by the electrode on the anode chamber side, which serves as the anode, to form oxygen (O ₂ ) and hydrogen ions (H ⁺ ). is generated, and chlorine ions (Cl ⁻ ) in water containing an electrolyte such as common salt (NaCl) supplied to the intermediate chamber (hereinafter simply referred to as “aqueous electrolyte solution”) are oxidized by the electrode on the anode chamber side to produce chlorine ( Cl ₂ ) is generated and reacts with water molecules (H ₂ O) to generate hypochlorous acid (HOCl) and hydrochloric acid (HCl), thereby generating oxidized water. On the other hand, water molecules (H ₂ O) of water supplied to the cathode chamber are reduced by the electrode on the cathode chamber side, which serves as a cathode, to generate hydrogen (H ₂ ) and hydroxide ions (OH ⁻ ). Sodium ions (Na ⁺ ) and hydroxide ions (OH ⁻ ) in the aqueous electrolyte solution react with each other to generate sodium hydroxide (NaOH) and reduce water.

Since electrolyzed water can be used for various purposes depending on its pH, electrolyzers capable of obtaining electrolyzed water of any pH have been developed.

JP-A-8-229565 JP-A-9-85247 WO2019/163388 WO2017/051452

Patent Document 1 discloses a three-chamber electrolysis apparatus in which electrodes are arranged in each of an anode chamber, an intermediate chamber, and a cathode chamber, and one chamber or two adjacent chambers thereof are configured as an electrolytic cell, and the electrolysis is performed. An electrolysis apparatus is disclosed in which the chamber adjacent to the cell is configured as an electrodialysis cell. According to this, it is said that acidic, neutral and alkaline electrolyzed water can be obtained at the same time.

Patent Document 2 discloses a three-chamber electrolysis apparatus in which a pair of electrodes are arranged in one of the anode chamber and the cathode chamber with a predetermined gap therebetween, and an electrode is arranged in the other of the anode chamber and the cathode chamber. , a first electrode of positive polarity, a second electrode of negative polarity, a third electrode positioned between the first and second electrodes and disposed in the same chamber as the first electrode. Electrolyzers are disclosed in which the electrodes are applied with a voltage at a potential intermediate to the voltages applied to the first and second electrodes. According to this, by adjusting the current applied to the second electrode and the third electrode, the pH of the electrolyzed water generated in the chamber where the first and third electrodes are arranged can be adjusted from acidic to medium. It is said that it can be arbitrarily adjusted within the range of sexuality.

Patent Document 3 describes a three-chamber electrolysis apparatus in which a pair of electrodes arranged between an anode chamber and an intermediate chamber, and between a cathode chamber and an intermediate chamber, are repeatedly energized at predetermined time intervals. An electrolysis device with a switching control is disclosed. According to this, it is said that the pH of the generated electrolyzed water can be accurately controlled.

Patent Document 4 discloses a three-chamber electrolysis apparatus in which an anode arranged inside an anode chamber, a cathode arranged inside a cathode chamber, an intermediate electrode arranged inside an intermediate chamber, and an anode; An electrolyzer is disclosed which comprises current control means for applying a direct current between the intermediate electrodes and between the intermediate electrode and the cathode while independently controlling the respective currents. According to this method, an aqueous electrolyte solution is placed in the intermediate chamber, water is placed in the anode chamber and the cathode chamber, current is applied to the anode, the cathode and the intermediate electrode in this state, and by adjusting this current, electrolysis at any pH can be achieved. It is said to be able to produce water.

However, in the electrolyzer of Patent Document 1, since acidic, neutral, and alkaline electrolyzed water can be obtained at the same time, if only acidic electrolyzed water is required, other electrolyzed water becomes unnecessary and must be drained. do not get The electrolytic device of Patent Document 2 is supposed to be able to adjust the pH of the electrolyzed water generated in the chamber where the first and third electrodes are arranged, but the second electrode is arranged. If the electrolyzed water generated in the room where the water is stored is not used, it will be disposed of as waste water, which is wasteful.

In this respect, by using the electrolyzers of Patent Documents 3 and 4 to mix the electrolyzed water obtained from the anode chamber and the cathode chamber to obtain mixed electrolyzed water, it is possible to make it difficult to generate wasteful drainage. . In addition, in the case of a storage type configuration in which the electrolyte aqueous solution is not newly supplied to the intermediate chamber or a configuration in which the electrolyte aqueous solution circulates in the intermediate chamber, the drainage can be prevented, but the concentration of the electrolyte aqueous solution changes over time. However, the pH of the generated mixed electrolyzed water may not be stable. In order to prevent this, if a method of always supplying fresh electrolyte aqueous solution to the intermediate chamber is taken, the waste water will be generated.

By the way, it is known that hypochlorous acid is present at a rate of 90% or more when the pH of mixed electrolyzed water is in the range of 3.5 to 6.5. When the pH of the mixed electrolyzed water reaches 7.5, the abundance ratio of hypochlorous acid and hypochlorite ions becomes 1:1, and when the pH is higher than that, the ratio of hypochlorite ions increases. Hypochlorite ions have significantly lower bactericidal power than hypochlorous acid, and have bleaching and skin irritation properties. On the other hand, if the pH of the mixed electrolyzed water is in the acidic range of 3.5 to 5, depending on the material to be used, rust may easily occur, or the material may be altered by acid. Therefore, hypochlorous acid water with a pH of 6 to 6.5 is desirable from the viewpoint of sterilization power and safety.

Therefore, the present invention provides an electrolyzer that can continue to simply and stably generate mixed electrolyzed water containing electrolyzed hypochlorous acid at a desired pH, particularly pH 6 to 6.5, without generating wasteful waste water. Its purpose is to

The present invention comprises an anode chamber, a cathode chamber, an intermediate chamber positioned between the anode chamber and the cathode chamber, a DC power source, a computing means, and a storage means,
the anode chamber comprises an anode chamber water inlet and an anode chamber outlet;
The cathode chamber has a cathode chamber water supply port and a cathode chamber water discharge port,
The intermediate chamber has an intermediate chamber water supply port and an intermediate chamber drainage port, and water is supplied from the intermediate chamber water supply port and the electrolyte aqueous solution drained from the intermediate chamber drainage port is circulated and supplied to the intermediate chamber. configured,
An anion exchange membrane and a first electrode are disposed between the anode chamber and the intermediate chamber,
A cation exchange membrane and a second electrode are disposed between the cathode chamber and the intermediate chamber,
A third electrode is disposed inside the intermediate chamber,
A current from the DC power supply is passed through the first electrode and the second electrode, and is also passed through a third electrode via a current load device provided on the first electrode side and/or the second electrode side. configured to be
configured to adjust the current flowing through the third electrode and the first electrode and/or the second electrode by the current load device;
The calculating means obtains a reference electrode potential obtained by dividing the electrolysis voltage at the beginning of operation by the voltage of the third electrode at the beginning of operation, and a reference electrode potential obtained by dividing the electrolysis voltage during operation by the voltage of the third electrode during operation. configured to calculate the electrode potential during operation;
the storage means is configured to store the reference electrode potential;
It is characterized in that a pH correction current is applied to the third electrode and the first electrode and/or the second electrode when a predetermined difference occurs between the reference electrode potential and the electrode potential during operation. The above problem was solved by an electrolytic device that

In the electrolysis apparatus of the present invention, an aqueous electrolyte solution such as saline is supplied from the water supply port of the intermediate chamber, discharged from the drain port of the intermediate chamber, circulated and supplied to the intermediate chamber. Therefore, wasteful drainage of the aqueous electrolyte solution does not occur. On the other hand, neutral water is supplied from the anode chamber water supply port and the cathode chamber water supply port, and electrolyzed water is discharged from the anode chamber water discharge port and the cathode chamber water discharge port. Since the present invention has the above configuration, the current load device can adjust the current flowing through the third electrode, the first electrode and/or the second electrode. Specifically, when the third electrode is energized via a current load device disposed on the first electrode side, the current flowing through the first electrode becomes lower than the current flowing through the second electrode. , the amount of electrolysis of the first electrode can be suppressed to increase the pH of the oxidized water produced in the anode chamber. Conversely, when the third electrode is energized via the current loading device provided on the second electrode side, the current flowing through the second electrode becomes lower than the current flowing through the first electrode. Since the amount of electrolysis of the two electrodes can be suppressed and the pH of the reduced water produced in the cathode chamber can be lowered, mixed electrolyzed water with a desired pH can be obtained. Furthermore, when the pH of the mixed electrolyzed water changes during continuous operation and a predetermined difference occurs between the reference electrode potential and the electrode potential during operation, a pH correction current is applied to the third electrode and the first electrode and/or the second electrode. To easily maintain the pH of oxidized water, reduced water, and mixed electrolyzed water at a predetermined value even if the concentration or pH of the aqueous electrolyte solution changes during operation because it is configured to flow. can be done. Therefore, in the present invention, it is possible to continue generating electrolyzed water of any pH more easily and stably without generating wasteful waste water.

Further, the storage means stores a predetermined correction coefficient determined by the pH correction current for obtaining a desired pH of the oxidized water, the reduced water, or the mixed electrolyzed water, and the ratio of the electrode potential during operation to the reference electrode potential. Further, if the calculation means is configured to determine the value X of the pH correction current by X=(1−(electrode potential during operation/reference electrode potential)) × correction coefficient, pH It is easy to obtain the value of the correction current.

In addition, if the current load device is configured to flow the current adjusted based on the value of the pH correction current to the third electrode and the first electrode and/or the second electrode, a separate power supply for flowing the pH correction current, etc. No equipment is required, and the manufacturing cost can be reduced with a simple configuration.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic diagram of the electrolysis apparatus of 1st embodiment of this invention. 4 is a graph showing changes in pH of oxidized water when current is applied to the third electrode via a current load device provided on the first electrode side. 4 is a graph showing changes in pH of reduced water when the third electrode is energized via a current load device provided on the second electrode side. 4 is a graph showing changes in pH of electrolyzed water obtained by mixing oxidized water and reduced water when the third electrode is energized via a current load device provided on the first electrode side. 5 is a graph showing changes in pH of electrolyzed water obtained by mixing oxidized water and reduced water when the third electrode is energized via a current load device provided on the second electrode side. Electrolyzed water in which oxidized water and reduced water are mixed when the third electrode is arranged near the first electrode and the third electrode is energized through the current load device arranged on the first electrode side. Graph showing changes in pH. Electrolyzed water in which oxidized water and reduced water are mixed when the third electrode is arranged near the first electrode and the third electrode is energized through the current load device arranged on the second electrode side. Graph showing changes in pH.

Embodiments of the present invention will be described below with reference to FIGS. However, the present invention is not limited to this embodiment.

As shown in FIG. 1, the electrolysis apparatus 100 of the first embodiment of the invention comprises an electrolytic cell 12 . The electrolytic cell 12 is divided into an anode compartment 14 , a cathode compartment 16 and an intermediate compartment 18 located between the anode compartment 14 and the cathode compartment 16 . An anion exchange membrane 52 and a first electrode 42 are arranged between the anode chamber 14 and the intermediate chamber 18, and a cation exchange membrane 54 and a second electrode 44 are arranged between the cathode chamber 16 and the intermediate chamber 18. are arranged.

Anode chamber 14 includes anode chamber water inlet 22 and anode chamber water outlet 32, cathode chamber 16 includes cathode chamber water inlet 24 and cathode chamber water outlet 34, and intermediate chamber 18 includes intermediate chamber water inlet 26 and intermediate chamber water inlet. A room drain port 36 is provided.

A third electrode 46 is arranged inside the intermediate chamber 18 , that is, between the anion exchange membrane 52 and the first electrode 42 and the cation exchange membrane 54 and the second electrode 44 . In electrolyzer 100 , third electrode 46 is positioned intermediate first electrode 42 and second electrode 44 .

The first electrode 42 is connected to the DC power supply V on the anode side, and the second electrode 44 is connected to the DC power supply V on the cathode side. The third electrode 46 is connected to the DC power supply V through a first current load device 62 arranged on the first electrode 42 side and a second current load device 64 arranged on the second electrode 44 side. . Note that there is also a configuration in which either the first or second current load device 62 is not provided and the third electrode 46 is not connected to the first electrode 42 side or the second electrode 44 side.

When the DC power supply V operates, the current from the DC power supply V flows through the first electrode 42 and the second electrode 44, and also flows through the first electrode 42 side and/or the second electrode 44 side. It also flows through the third electrode 46 via the second current loads 62,64. The current flowing through the third electrode 46 is configured to be adjustable by controlling the loads of the first and second current load devices 62 and 64 . Thereby, the current flowing through the third electrode 46 and the first electrode 42 and/or the second electrode 44 can be adjusted by the first and second current loading devices 62,64.

The electrolysis device 100 has a controller 70 . The controller 70 is electrically connected to the DC power source V and the first and second current load devices 62 and 64 and is configured to be able to control them by the control means 76 . The controller 70 further has storage means 72 and calculation means 74 . These functions are described later.

Neutral water such as pure water or tap water is supplied to the anode chamber 14 and the cathode chamber 16 from an anode chamber water supply port 22 and a cathode chamber water supply port 24, respectively. drained from Here, if a mixing means such as a mixing tank (not shown) connected to the anode chamber drain port 32 and the cathode chamber drain port 34 is further provided, the oxidized water produced in the anode chamber 14 and the cathode chamber 16 can be By mixing the generated reduced water, mixed electrolyzed water having a desired pH, in particular, mixed electrolyzed water containing electrolyzed hypochlorous acid having a pH of 6 to 6.5 can be easily generated without generating wasteful wastewater. can.

Although not shown, the cathode chamber drain port 34 and the anode chamber water supply port 22 are connected so that the reduced water drained from the cathode chamber drain port 34 is supplied to the anode chamber 14 . may With this configuration, the reduced water produced in the cathode chamber 16 is allowed to flow into the anode chamber 14 and mixed with the oxidized water produced in the anode chamber 14 to obtain electrolyzed water having a desired pH. It can be a compact electrolytic device 100 that does not cause

The electrolyte aqueous solution is supplied to the intermediate chamber 18 from the intermediate chamber water supply port 26 and drained from the intermediate chamber drain port 36 . The electrolyte contains chlorine ions, and water to which a material containing chlorine ions such as sodium chloride is added can be used as the aqueous electrolyte solution. Although illustration is omitted, in the electrolytic device 100, the intermediate chamber water supply port 26 and the intermediate chamber drain port 36 are connected via a tank (not shown) so that the aqueous electrolyte solution circulates. Therefore, wasteful drainage of the aqueous electrolyte solution does not occur.

The first to third electrodes 42, 44, 46 can be meshed. At this time, if the mesh of the third electrode 46 is made coarser than the meshes of the first and second electrodes 42, 44, it is possible to prevent the phenomenon that the electrolysis voltage rises and the electrolysis becomes impossible.

The current of the DC power supply V is set to 11.5 A, and pure water is supplied to and discharged from the anode chamber 14 and the cathode chamber 16 at a flow rate of 2 L per minute. Table 1 shows changes in the pH of the oxidized water and the reduced water when the current flowing through the third electrode 46 is changed by controlling the load.

As shown in FIG. 2, when no current is flowing through the third electrode 46, the pH of the oxidized water is 2.77, but as the current flowing through the third electrode 46 increases, the pH of the oxidized water increases. The result was obtained. Note that the pH of the reduced water did not change.

When the load of the first current load device 62 arranged on the first electrode 42 side is controlled and current is passed through the third electrode 46, the load on the first electrode 42 changes depending on the load of the first current load device 62. Since the flowing current increases or decreases, the amount of electrolysis by the first electrode 42 can be increased or decreased, and the pH of the oxidized water produced in the anode chamber 14 can be controlled. At this time, no current flows through the second load device 64 and the third electrode 46 functions as an anode, so negative ions are also produced in the intermediate chamber 18 , but most are discharged through the intermediate chamber drain port 36 .

Thus, when the third electrode 46 is energized via the first current load device 62 arranged on the first electrode 42 side, the current flowing through the first electrode 42 is passed through the second electrode 44. Since it is lower than the electric current, the amount of electrolysis of the first electrode 42 can be suppressed and the pH of the oxidized water generated in the anode chamber 14 can be increased.

Under the same conditions, the load of the second current load device 64 arranged on the side of the second electrode 44 is controlled to change the pH of the oxidized water and the reduced water when the current flowing through the third electrode 46 is changed. Table 2 shows.

As shown in FIG. 3, the pH of the reduced water is 10.3 when no current flows through the third electrode 46, but the pH of the reduced water decreases as the current flowing through the third electrode 46 increases. The result was obtained. Note that the pH of the oxidized water did not change.

When the load of the second current load device 64 arranged on the side of the second electrode 44 is controlled and current is passed through the third electrode 46, the load on the second electrode 44 according to the load of the second current load device 64 Since the flowing current increases or decreases, the amount of electrolysis by the second electrode 44 can be increased or decreased, and the pH of the reduced water generated in the cathode chamber 16 can be controlled. At this time, no current flows through the first load device 62 and the third electrode 46 functions as a cathode, so positive ions are also produced in the intermediate chamber 18 , but most are discharged through the intermediate chamber drain 36 .

Thus, when the third electrode 46 is energized via the second current load device 64 arranged on the side of the second electrode 44, the current flowing through the second electrode 44 is passed through the first electrode 42. Since it is lower than the electric current, the amount of electrolysis of the second electrode 44 can be suppressed and the pH of the reduced water generated in the cathode chamber 16 can be lowered.

As described above, in the electrolyzer 100, the pH of the oxidized water and the reduced water can be changed by operating the first and second current load devices 62, 64. It can be generated more easily.

Next, Tables 3 and 4 show changes in pH when the oxidized water produced in the anode chamber 14 and the reduced water produced in the cathode chamber 16 are mixed under the same conditions to obtain mixed electrolyzed water. Table 3 shows the results when the current flowing through the third electrode 46 was changed by controlling the load of the first current load device 62 arranged on the first electrode 42 side. As shown in FIG. 4, by controlling the load of the first current load device 62, the pH of the mixed electrolyzed water could be changed within the range of 6.6 to 7.86.

Table 4 shows the results when the current flowing through the third electrode 46 was changed by controlling the load of the second current load device 64 arranged on the second electrode 44 side. As shown in FIG. 5, by controlling the load of the second current load device 64, the pH of the mixed electrolyzed water could be varied within the range of 4.5 to 6.6.

As shown in FIGS. 4 and 5, except when a current of 2.5 A or more is applied to the third electrode 46 via the second current load device 64, the pH of the mixed electrolyzed water can be changed substantially linearly. rice field. Thus, in the electrolyzer 100, by operating the first and second current loading devices 62, 64, electrolyzed water of any pH can be generated more easily. In particular, when generating electrolyzed water containing hypochlorous acid, it is preferable to set the pH of the electrolyzed water to about 4.0 to 6.5, particularly pH 5 to 6.5, so that more oxidation is performed for reduced water. Electrolyzed water containing hypochlorous acid can be produced by mixing water in a mixing tank (not shown) connected to the anode chamber drain port 32 and the cathode chamber drain port 34 . Therefore, such electrolyzed water can be easily generated without generating wasteful drainage.

Here, if the cathode chamber drain port 34 and the anode chamber water supply port 22 are connected, the reduced water produced in the cathode chamber 16 is allowed to flow into the anode chamber 14, and the oxidized water produced in the anode chamber 14 Since electrolyzed water having a desired pH can be obtained by mixing, the electrolyzer 100 can be compact and does not waste water.

Next, the third electrode 46 is arranged near the first electrode 42, and under the same conditions as before, the oxidized water produced in the anode chamber 14 and the reduced water produced in the cathode chamber 16 are mixed. Tables 5 and 6 show changes in pH when mixed electrolyzed water is obtained. Table 5 shows the results when the current flowing through the third electrode 46 was changed by controlling the load of the first current load device 62 arranged on the first electrode 42 side. As shown in FIG. 6, by controlling the load of the first current load device 62, the pH of the mixed electrolyzed water could be changed within the range of 5.6 to 6.68.

Table 6 shows the results when the current flowing through the third electrode 46 was changed by controlling the load of the second current load device 64 arranged on the second electrode 44 side. As shown in FIG. 7, by controlling the load of the second current load device 64, the pH of the mixed electrolyzed water could be changed within the range of 3.5 to 5.6.

As shown in FIGS. 6 and 7, the change in pH of the mixed electrolyzed water was no longer linear when a current was passed through the third electrode 46 via the second current load device 64 . That is, positioning the third electrode 46 between the first electrode 42 and the second electrode 44 makes it easier to stabilize the pH fluctuation of the mixed electrolyzed water.

In the above example, when the load of the first current load device 62 arranged on the first electrode 42 side is controlled and current is passed through the third electrode 46, the third No current flows through the electrode 46. Conversely, when the load of the second current load device 64 provided on the second electrode 44 side is controlled to allow current to flow through the third electrode 46, the first current No current was allowed to flow through the load device 62 to the third electrode 46 . However, since it is considered that the pH of the oxidized water and the reduced water changes depending on the difference between the currents flowing through the first electrode 42 and the second electrode 44, the difference between the currents flowing through the first electrode 42 and the second electrode 44 should be generated. If possible, the loads of the first current load device 62 and the second current load device 64 can be changed as appropriate.

In the above, the current of the DC power supply V is set to 11.5 A, the pure water is supplied to and discharged from the anode chamber 14 and the cathode chamber 16 at a flow rate of 2 L per minute, and the current flowing through the third electrode 46 is set in the range of 0 A to 3 A. Although it is changed, other conditions may be used.

As described above, in the electrolytic device 100, the intermediate chamber water supply port 26 and the intermediate chamber drainage port 36 are connected via a tank (not shown) so that the electrolytic aqueous solution circulates. When the operation of the electrolytic device 100 is continued for a long period of time, the pH of the aqueous electrolyte solution gradually changes, which causes the pH of the oxidized water and the reduced water to change, which in turn causes the pH of the mixed electrolyzed water to change. happens. This is probably because the amounts of Na ⁺ ions and CL ⁻ ions consumed in the aqueous electrolyte solution differ during operation, so that the ratio of Na ⁺ ions and CL ⁻ ions gradually changes.

In order to stabilize the pH of the oxidized water, the reduced water, and the mixed electrolyzed water, it is conceivable to measure the pH of the oxidized water and the reduced water immediately after they are generated and take appropriate measures. Accurately measuring the pH of water is difficult. Therefore, in the electrolytic device 100, attention is focused on the phenomenon that when the pH of the aqueous electrolyte solution changes and the pH of the oxidized water, the reduced water, and the mixed electrolyzed water changes, the voltage of the third electrode 46 also changes in correlation. , the electrolysis voltage and the voltage of the third electrode 46 (hereinafter simply referred to as "third electrode voltage"), which are considered to be correlated with pH, are measured, and the pH of oxidized water, reduced water, and mixed electrolyzed water is measured. I am stabilizing. Details are given below.

First, the computing means 74 of the controller 70 divides the electrolysis voltage at the beginning of operation, that is, when operation is started with a new electrolyte aqueous solution, by the third electrode voltage at the beginning of operation, and It is configured to calculate an operating electrode potential obtained by dividing the voltage by the operating third electrode voltage. The electrolysis voltage is measured by the electrolysis voltage measuring means 82 arranged to measure the voltage of the DC power supply V, and the third electrode voltage is measured by the third electrode voltage measurement provided between the second electrode 44 and the third electrode 46. Measured by means 84 . The third electrode voltage measuring means 84 may be arranged between the first electrode 42 and the third electrode 46 . The electrolytic voltage measuring means 82 and the third electrode voltage measuring means 84 may be a known voltmeter or a device having that function. The reference electrode potential is stored by storage means 72 . The operating electrode potential is constantly calculated during operation.

Then, when a predetermined difference occurs between the reference electrode potential and the operating electrode potential, the command means 76 causes the pH correction current to flow through the third electrode 46 and the first electrode 42 and/or the second electrode 44. It is The amount of pH correction current to be applied to the third electrode 46 and the first electrode 42 and/or the second electrode 44 when there is a difference between the reference electrode potential and the electrode potential during operation depends on the amount of oxidation to be generated. It depends on the desired pH of water, reduced water, or mixed electrolyzed water. Although it is possible to generate the pH correction current by using another power source (not shown), if another power source is connected, it becomes difficult to detect the state of the third electrode 46, such as the voltage. Adding a circuit or the like complicates the system and is not suitable.

Therefore, the pH-corrected current is adjusted based on the value of the pH-corrected current by controlling the first current loading device 62 or the second current loading device 64 so that the third electrode 46 and the first electrode 42 and/or Alternatively, it is preferable to configure so as to flow to the second electrode 44 . Specifically, first, the storage means 72 stores the current flowing through the third electrode 46 and the first electrode 42 and/or the second electrode 44 by the first current loading device 62 and/or the second current loading device 64 at the initial stage of operation. is configured to store a pH reference current. Then, the calculation means 74 calculates the current adjusted based on the pH correction current and the pH reference current, and the command means 76 causes the first current load device 62 and/or the second current load device 64 to be calculated by the calculation means 74. can be configured to pass the applied current through the third electrode 46 and the first electrode 42 and/or the second electrode 44 . With this configuration, the manufacturing cost can be reduced with a simple configuration.

The storage means 72 of the controller 70 is configured to further store the correction coefficient, and the calculation means 74 calculates the value X of the pH correction current as X=(1−(electrode potential during operation/reference electrode potential)) × correction , the value of the pH correction current can be easily obtained. The correction coefficient may be determined according to the desired pH of the generated oxidized water, reduced water, or mixed electrolyzed water. Here, the correction coefficient is set to 2.5, the pure water flow rate is set to 2 L/min using the electrolytic device 100 and the electrolyte aqueous solution having a salt concentration of 16%, and the third electrode current is kept constant. Electrolysis voltage, third electrode voltage, reference electrode potential, electrode potential during operation, pH of mixed electrolyzed water (before correction), pH correction current, and pH of mixed electrolyzed water after correction when the pH of the aqueous solution is changed are shown in Table 7.

In the measured values shown in Table 7, the row of the electrolyte aqueous solution pH 6 is the value measured using the new electrolyte aqueous solution with a salt concentration of 16%. Therefore, the reference electrode potential will be 0.46839 for that row, and the electrode potential for the other rows will be the operating electrode potential. Using this reference electrode potential, the electrode potential during operation, and a correction factor of 2.5, the pH-corrected current is calculated. In addition, the value of the pH correction current is rounded off to the second decimal place. As is clear from Table 7, the pH correction current may not flow to the third electrode 46 depending on the difference between the reference electrode potential and the operating electrode potential. Thus, if the correction factor is set to 2.5, it is possible to stably generate mixed electrolyzed water with a pH of 6 to 6.5.

As described above, according to the present invention, mixed electrolyzed water of any pH, particularly pH 6 to 6.5, can be generated more easily without generating waste water, and can be stably operated continuously. It is possible to provide an electrolytic device capable of producing mixed electrolyzed water having a desired pH.

100 Electrolyzer 14 Anode Chamber 16 Cathode Chamber 18 Intermediate Chamber 22 Anode Chamber Water Supply Port 24 Cathode Chamber Water Supply Port 26 Intermediate Chamber Water Supply Port 32 Anode Chamber Drain Port 34 Cathode Chamber Drain Port 36 Intermediate Chamber Drain Port 42 First Electrode 44 Second Electrode 46 third electrode 52 anion exchange membrane 54 cation exchange membrane 62 first current load device 64 second current load device 72 storage means 74 calculation means V DC power supply

Claims (1)

comprising an anode chamber, a cathode chamber, an intermediate chamber positioned between the anode chamber and the cathode chamber, a DC power source, a computing means, and a storage means,
the anode chamber comprises an anode chamber water inlet and an anode chamber outlet;
The cathode chamber has a cathode chamber water supply port and a cathode chamber water discharge port,
The intermediate chamber has an intermediate chamber water supply port and an intermediate chamber drainage port, and water is supplied from the intermediate chamber water supply port and the electrolyte aqueous solution drained from the intermediate chamber drainage port is circulated and supplied to the intermediate chamber. configured,
An anion exchange membrane and a first electrode are disposed between the anode chamber and the intermediate chamber,
A cation exchange membrane and a second electrode are disposed between the cathode chamber and the intermediate chamber,
A third electrode is disposed inside the intermediate chamber,
A current from the DC power supply is passed through the first electrode and the second electrode, and is also passed through a third electrode via a current load device provided on the first electrode side and/or the second electrode side. configured to be
configured to adjust the current flowing through the third electrode and the first electrode and/or the second electrode by the current load device;
The calculating means obtains a reference electrode potential obtained by dividing the electrolysis voltage at the beginning of operation by the voltage of the third electrode at the beginning of operation, and a reference electrode potential obtained by dividing the electrolysis voltage during operation by the voltage of the third electrode during operation. configured to compute an electrode potential during operation;
the storage means is configured to store the reference electrode potential;
It is characterized in that a pH correction current is applied to the third electrode and the first electrode and/or the second electrode when a predetermined difference occurs between the reference electrode potential and the electrode potential during operation. do,
electrolytic device.

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