JP3201699B2 - Method and apparatus for producing hypochlorous acid-based treatment liquid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hypochlorous acid-based treatment solution which is a neutral or weakly acidic treatment solution containing hypochlorous acid, sodium hypochlorite, etc. and having a bactericidal and disinfecting action. And a manufacturing apparatus.

[0002]

2. Description of the Related Art The most common method for producing a treating solution containing hypochlorous acid, sodium hypochlorite and the like having a bactericidal action and a disinfecting action is to use a commercially available aqueous solution of sodium hypochlorite. There is a method of dissolving and diluting in water.

[0003]

By the way, in general, the pH of a commercially available aqueous solution of sodium hypochlorite is adjusted to about 13 in order to ensure good storage stability. For this reason, when the aqueous solution is used as a disinfecting solution, the aqueous solution is diluted about 1000 times to adjust the pH to 9 to 9.
It is used after being adjusted to about 10. However, in this case, the diluted aqueous solution is alkaline and thus has a weak bactericidal effect, and when the diluted aqueous solution is used as a disinfectant for hand washing or the like, oil is removed from the skin because the diluted aqueous solution is alkaline. It may cause rough skin. As described above, in order to prepare a dilute aqueous solution having a strong bactericidal activity using a commercially available aqueous solution of sodium hypochlorite, it is necessary to dilute the aqueous solution to about 200 times with water. In this case, the pH becomes extremely high alkalinity of about 11, and when used for disinfection and sterilization treatment, careful attention is required so as not to touch the skin directly, which greatly restricts the field of use and is troublesome to handle. It is.

Accordingly, it is an object of the present invention to provide a neutral or weakly acidic hypochlorous acid-based treatment solution by an electrodialysis method using a selectively permeable membrane for ions which selectively allow cations or anions to permeate. Is to manufacture.

[0005]

According to the present invention, there is provided a method for producing a hypochlorous acid-based treatment liquid, which comprises hypochlorous acid, sodium hypochlorite, etc. and has a bactericidal and disinfecting action. This is a production method for producing an acid-based treatment liquid by an electrodialysis method, characterized by having the following constitutional requirements.

That is, the first production method of the present invention is a production method based on the above-described electrodialysis method, wherein an aqueous solution in which sodium hypochlorite is dissolved is used as a production stock solution, and an ion permeation tank is used as an electrodialysis tank. Compartment formed by a transparent diaphragm or a permselective membrane selectively permeating cations and having an anode disposed therein and a permselective membrane selectively permeating cations An electrodialysis tank having a second compartment in which a cathode is disposed and a third compartment defined between the two compartments, wherein a third compartment of the electrodialysis tank is provided. The method further comprises flowing the stock solution and flowing water into the first and second compartments.

A second production method of the present invention is a production method based on the above-described electrodialysis method, wherein an aqueous solution in which sodium hypochlorite is dissolved is used as a production stock solution, and an ion permeation tank is used as an electrodialysis tank. Formed by a first compartment in which a cathode is disposed and defined by a selectively permeable membrane or a permselective membrane that selectively permeates cations, and a permselective membrane formed by a permselective membrane that selectively transmits anions. An electrodialysis tank having a second compartment in which the anode is disposed and a third compartment defined between the two compartments, wherein a third compartment of the electrodialysis tank is used. Wherein the undiluted solution is allowed to flow, and water is caused to flow into the first and second compartments.

In each of these manufacturing methods, it is preferable to use an aqueous solution in which a strong electrolytic substance is dissolved, as the water to be flown to one or both of the first and second compartments.

The apparatus for producing a hypochlorous acid-based treatment liquid according to the present invention is an apparatus for producing a hypochlorous acid-based treatment liquid containing hypochlorous acid, sodium hypochlorite, etc. and having a bactericidal action and a disinfecting action. A manufacturing apparatus manufactured by a dialysis method, characterized by having the following constituent requirements.

That is, the first manufacturing apparatus of the present invention is a manufacturing apparatus based on the above-mentioned electrodialysis method, and is formed by partitioning with an ion-permeable diaphragm or a permselective membrane that selectively permeates cations. A first compartment in which an anode is disposed, a second compartment in which a cathode is disposed by being formed by a permselective membrane that selectively transmits cations, and a partition formed by both compartments An electrodialysis tank with a third compartment,
An outflow pipe connected to each of the compartments and allowing the treated water to flow out of these compartments; and a first and a second pipe connected to the first and second compartments and supplying water to each of the compartments. Supply pipeline and
A third supply pipe connected to the third compartment to supply the undiluted solution to the compartment.

A second production apparatus of the present invention is a production apparatus based on the above-mentioned electrodialysis method, wherein the second production apparatus is partitioned by an ion-permeable diaphragm or a selectively permeable membrane that selectively permeates cations. A first compartment in which the cathode is disposed, a second compartment in which the anode is disposed by being formed by a permselective membrane selectively transmitting anions, and a partition formed by both compartments An electrodialysis tank having a third compartment, an outlet line connected to each of the compartments and allowing the treated water to flow out of these compartments, and an outlet line connected to the first and second compartments. First and second supply pipes for supplying water to the same compartment, and a third supply pipe connected to the third compartment for supplying the stock solution to the same compartment.
Is provided.

[0012]

According to the first method and apparatus of the present invention, the undiluted aqueous solution for dissolving sodium hypochlorite is supplied to the third compartment of the electrodialysis tank and the same. Under the electrodialysis effect in the compartment, cations such as sodium ions in the stock solution pass through the cation selectively permeable membrane and migrate into the water in the second compartment. For this reason, the undiluted solution becomes neutral or weakly acidic by gradually reducing cations such as sodium ions, and is generated and discharged as a neutral or weakly acidic hypochlorous acid-based treatment solution.

According to the second manufacturing method and the manufacturing apparatus of the present invention, the stock solution is supplied to the third compartment of the electrodialysis tank, subjected to the electrodialysis action in the same compartment, and subjected to the sodium dialysis in the stock solution. Cations such as ions pass through the ion-permeable membrane or the cation-selective membrane and migrate into water in the first compartment, and anions such as chloride ions and chlorate ions in the stock solution are removed. The anions permeate through the permselective membrane and enter the water in the second compartment. Therefore, each ion in the undiluted solution gradually decreases, and anions such as chloride ions and chlorate ions gradually increase in the water in the second compartment.
The water in the compartment becomes weakly acidic or acidic, and a weakly acidic hypochlorous acid-based treatment liquid is generated and flows out.

As described above, in each of the production methods and production apparatuses of the present invention, an aqueous solution of sodium hypochlorite is used as a stock solution for neutral or weakly acidic hypochlorous acid treatment by electrodialysis. The liquid can be easily manufactured. Therefore, according to each production method and production apparatus of the present invention, a hypochlorite-based treatment liquid having a high bactericidal action, a disinfecting action, a neutral or weakly acidic, safe and easy to handle, has been described in detail at the beginning. Compared with the case of manufacturing by a conventional method, it can be manufactured very advantageously and reliably.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the drawings.
FIG. 1 shows a first method for carrying out the first manufacturing method of the present invention.
FIG. 2 shows a second manufacturing apparatus for carrying out the second manufacturing method of the present invention.

A first manufacturing apparatus 10 shown in FIG.
The manufacturing apparatus includes an electrodialysis tank 11, a storage tank 12 for storing a high-concentration aqueous solution of sodium hypochlorite, first, second, and third storage tanks 13a, 13b, and 13c. 14a, 14b, 14c, each outlet line 1
5a, 15b, 15c, supply pump 16a, control valves 16b, 16c, pH sensor 17a, DC power supply 17
b, and a control device 17c.

In the first production apparatus 10, an ion-permeable diaphragm 11b and a cation-exchange membrane 11c, which is a cation selective permeable membrane, are arranged in a tank body 11a constituting the electrodialysis tank 11. A first compartment R1, a second compartment R2,
A third compartment R3 is defined. An anode 11d is disposed in the first compartment R1, and a cathode 11e is provided in the second compartment R2.
Is arranged. In the electrodialysis tank 11, a first supply line 14a and a first outflow line 15 are provided in the first compartment R1.
a, the second supply line 14b and the second outflow line 15b are connected to the second compartment R2, and the third supply line 14c and the third outflow line 15c are connected to the third compartment R3. It is connected.

The first supply line 14a is connected to a supply source of water having high electric conductivity, for example, an aqueous solution in which a strong electrolyte substance is dissolved, and supplies the aqueous solution to the first compartment R1. The two supply pipes 14b are also connected to a similar aqueous solution supply source, and supply this aqueous solution to the second compartment R2. On the other hand, the third supply pipe 14c is connected to the storage tank 12, and has a high concentration in the storage tank 12, for example, 10% by weight to 10% by weight.
A 12% by weight aqueous solution of sodium hypochlorite was added to the third compartment R
Supply to 3. Further, the first outflow pipe 15a is connected to the first storage tank 13a, the second outflow pipe 15b is connected to the second storage tank 13b, and the third outflow pipe 15c is connected to the third storage tank 13c. And the first compartment R1, the second
The water generated from the compartment R2 and the third compartment R3 is stored in each storage tank 13
a, 13b, and 13c.

In the electrodialysis tank 11 of the first manufacturing apparatus 10 configured as described above, a high-concentration aqueous solution of sodium hypochlorite is supplied from the storage tank 12 to the third compartment R3, An aqueous solution of a strong electrolyte is supplied to the two compartments R1 and R2 to perform electrodialysis. In this case, cations such as sodium ions in the aqueous solution of sodium hypochlorite supplied to the third compartment R3 pass through the cation exchange membrane 11c and move to the second compartment R2. Anions such as chlorite ions pass through the diaphragm 11b and move to the first compartment R1. Therefore, a neutral aqueous solution of hypochlorous acid is generated in the third compartment R3 and flows out to the third storage tank 13c, and weakly acidic water is generated in the first compartment R1 to generate the first storage tank 13a. The alkaline water is generated in the second compartment R2 and is discharged to the second storage tank 13b. Each of these storage tanks 13a, 13b, 13c
The generated water flowing out is used for an appropriate application.

In the first manufacturing apparatus 10, the third
The pH of the aqueous solution flowing out of the third compartment R3 is constantly detected by the pH sensor 17a disposed in the outflow pipe 15c, and the detected value is output to the control device 17c as a detection signal. The control device 17c supplies the supply pump 16a, the control valves 16b and 16c,
By controlling the current and voltage of the DC power supply 17b, the third compartment R3
The aqueous solution flowing out of is kept neutral. In the first manufacturing apparatus 10, a cation exchange membrane similar to the cation exchange membrane 11c can be used instead of the membrane 11b.

FIG. 2 shows a second manufacturing apparatus for performing the second manufacturing method of the present invention. The second manufacturing apparatus 20 includes an electrodialysis tank 21, a storage tank 22 for storing a high-concentration aqueous solution of sodium hypochlorite, and first and second storage tanks 23.
a, 23b, and each supply line 24a, 24
b, 24c, each outlet line 25a, 25b, 25c, each supply pump 26a, 26b, each control valve 26c, 26
d, 26e, a pH sensor 27a, a DC power supply 27b, and a control device 27c.

In the second manufacturing apparatus 20, an ion-permeable diaphragm 21b and an anion-exchange membrane 21c, which is an anion-selective-permeable membrane, are arranged in a tank body 21a constituting the electrodialysis tank 21. A first compartment R1, a second compartment R2,
A third compartment R3 is defined. A cathode 21e is disposed in the first compartment R1, and an anode 21d is provided in the second compartment R2.
Is arranged. In the electrodialysis tank 21, the first supply line 24a and the first outflow line 25 are provided in the first compartment R1.
a, the second supply line 24b and the second outflow line 25b are connected to the second compartment R2, and the third supply line 24c and the third outflow line 25c are connected to the third compartment R3. It is connected.

The first supply line 24a is connected to a supply source of water having high electrical conductivity, for example, an aqueous solution in which a strong electrolyte substance is dissolved, and supplies this aqueous solution to the first compartment R1. The two supply pipes 24b are connected to a supply source of tap water, and supply tap water to the second compartment R2. On the other hand, the third supply pipe 24c is connected to the storage tank 22, and supplies a high concentration, for example, 10% to 12% by weight aqueous sodium hypochlorite solution in the storage tank 22, to the third compartment R3. .
Further, the first outflow pipe 25a is connected to the first storage tank 23a, and the second outflow pipe 25b is connected to the second storage tank 23b, and is formed from the first compartment R1 and the second compartment R2. The water is allowed to flow out into each of the storage tanks 23a and 23b, and the treated water from the third compartment R3 is discharged to the outside.

In the electrodialysis tank 21 of the second manufacturing apparatus 20 configured as described above, a high-concentration aqueous solution of sodium hypochlorite is supplied from the storage tank 22 to the third compartment R3, and the first compartment R1 Is supplied with an aqueous solution of a strong electrolytic substance, and tap water is supplied to the second compartment R2 to perform electrodialysis. In this case, cations such as sodium ions in the aqueous solution of sodium hypochlorite supplied to the third compartment R3 pass through the diaphragm 21b and move to the first compartment R1, and chlorine ions, chlorate ions, etc. Move through the anion exchange membrane 21c to the second compartment R2. For this reason, in the first compartment R1, alkaline water is generated and the first
The solution is discharged to the storage tank 23a, and an acidic or weakly acidic aqueous solution of hypochlorous acid is generated in the second compartment R2 and is discharged to the second storage tank 23b, and neutral water is generated in the third compartment R3. It is released as it is. Each storage tank 23
The product water flowing out to a and 23b is used for an appropriate use.

In the second manufacturing apparatus 20, the second
The pH of the aqueous solution flowing out of the second compartment R2 is constantly detected by the pH sensor 27a disposed in the outflow conduit 25b, and the detected value is output to the control device 27c as a detection signal. The control device 27c controls the supply pumps 26a and 26b and the control valves 26 based on the detection signal.
By controlling the currents and voltages of c, 26d, 26e and the DC power supply 27b, the aqueous solution flowing out of the second compartment R2 is maintained at a predetermined acidity. In the second manufacturing apparatus 20, a cation exchange membrane similar to the cation exchange membrane 11c can be used instead of the diaphragm 21b.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a first manufacturing apparatus of the present invention.

FIG. 2 is a schematic configuration diagram showing a second manufacturing apparatus of the present invention.

[Explanation of symbols]

10, 20: manufacturing apparatus, 11, 21: electrodialysis tank, 11
b, 21b ... diaphragm, 11c ... cation exchange membrane, 21c ...
Anion exchange membrane, 11d, 21d ... Anode, 11e, 21
e: cathode, 14a, 14b, 14c, 24a, 24b,
24c ... supply pipe, 15a, 15b, 15c, 25a,
25b, 25c: Outflow pipeline, R1, R2, R3: compartment.

Claims (5)

(57) [Claims] 1. A method for producing a hypochlorous acid-based treatment liquid containing hypochlorous acid, sodium hypochlorite and the like having a bactericidal action and a disinfecting action by an electrodialysis method. An aqueous solution that dissolves sodium chlorite is employed, and an electrodialysis tank is formed with an ion-permeable diaphragm or a permselective membrane that selectively permeates cations. A compartment, a second compartment defined by a permselective membrane selectively permeating cations and having a cathode disposed therein, and a third compartment defined between the two compartments Wherein the undiluted solution is made to flow in a third compartment of the electrodialysis tank, and water is made to flow in the first and second compartments. A method for producing a chloric acid-based treatment solution. 2. A process for producing a hypochlorous acid-based treatment liquid containing hypochlorous acid, sodium hypochlorite and the like and having a bactericidal action and a disinfecting action by electrodialysis. An aqueous solution for dissolving sodium chlorite is employed, and a cathode is disposed and formed as an electrodialysis tank, which is partitioned by an ion-permeable diaphragm or a permselective membrane that selectively permeates cations. A compartment, a second compartment defined by a permselective membrane selectively permeating anions and having an anode disposed therein, and a third compartment defined between the two compartments Wherein the undiluted liquid is made to flow in a third compartment of the electrodialysis tank, and water is made to flow in the first and second compartments. A method for producing a chloric acid-based treatment solution. 3. The method for producing a hypochlorous acid-based treatment solution according to claim 1 or 2, wherein the water that flows into one or both of the first and second compartments is a substance of a strong electrolyte. A method for producing a hypochlorous acid-based treatment solution, wherein the solution is an aqueous solution in which is dissolved. 4. A production apparatus for producing a hypochlorous acid-based treatment liquid containing hypochlorous acid, sodium hypochlorite and the like having a bactericidal action and a disinfecting action by an electrodialysis method. A first compartment defined by a diaphragm or a permselective membrane that selectively permeates cations and in which an anode is disposed;
A second compartment in which a cathode is disposed and formed by a permselective membrane that selectively permeates cations, and an electricity having a third compartment formed by being formed between the two compartments A dialysis tank, an outflow pipe connected to each of the compartments to allow the treated water to flow out of these compartments, and a tubing connected to the first and second compartments to supply water to each of the compartments. A hypochlorous acid system, comprising: a first supply line, a second supply line, and a third supply line connected to the third compartment for supplying the undiluted solution to the same compartment. Equipment for processing solution. 5. A production apparatus for producing a hypochlorous acid-based treatment liquid containing hypochlorous acid, sodium hypochlorite and the like having a bactericidal action and a disinfecting action by an electrodialysis method. A first compartment in which a cathode is disposed, the compartment being formed by a diaphragm or a permselective membrane that selectively permeates cations;
A second compartment in which an anode is disposed and formed by a permselective membrane that selectively transmits anions, and an electric power having a third compartment formed between the two compartments A dialysis tank, an outflow pipe connected to each of the compartments to allow the treated water to flow out of these compartments, and a first connected to the first and second compartments to supply water to the compartments. And a second supply line, and a third supply line connected to the third compartment for supplying the undiluted solution to the third compartment. Solution manufacturing equipment.