JP2004275841A - Strong alkaline electrolytic water and method and apparatus for making the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide strong alkaline electrolytic water which develops an excellent washing effect without using a chemical synthetic detergent or the like, does not rust a metal material, dispenses with the maintenance of an electrode and can be used for washing and the removal of bacteria at the same time, a method for making the same and a strong alkaline electrolytic water making apparatus. <P>SOLUTION: This strong alkaline electrolytic water making apparatus 1 is constituted by arranging an ion exchange membrane 5 for demarcating an anode 3 side and a cathode 4 side in an electrolytic cell 2 for performing electrolysis. An electrolyte aqueous solution 8 containing potassium carbonate is supplied to the anode 3 side while pure water 9 is supplied to the cathode 4 side to make strong alkaline water 11 by electrolysis. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to strongly alkaline electrolyzed water, and more particularly to a strongly alkaline electrolyzed water effective as washing water used for washing mechanical parts and other components, a method for producing the same, and an apparatus for producing the same.
[0002]
[Prior art]
Conventionally, organic solvent-based cleaning liquids, water-soluble cleaning agents, and the like have been generally used as cleaning water for cleaning machine parts, foods, and the like.
Since these cleaning agents use water, rust-proof materials such as metal parts are used. However, in the case of cleaning, it is necessary to perform a rust prevention treatment after the cleaning. In particular, when an alkaline cleaning agent is used for cleaning aluminum, zinc, and the like, there has been a problem that the metal surface is corroded by an alkali component and serious quality defects may be caused.
[0003]
Therefore, in recent years, by using alkaline electrolyzed water, so-called alkaline ionized water, a good cleaning effect can be obtained without using a special chemical, and it is known as cleaning water which does not adversely affect the global environment.
[0004]
For example, in alkaline water in which the pH value of water obtained by electrolysis is 8.0 or more and 13.0 or less and the oxidation-reduction potential is -100 mV to -1000 mV, the alkali ion water having a residual chlorine concentration of 5 ppm or less is washed. One that is used as water has been proposed (see Patent Document 1).
[0005]
[Patent Document 1]
JP-A-10-192860 (page 2-7, FIG. 1)
[0006]
[Problems to be solved by the invention]
However, generally, electrolysis using an aqueous electrolyte solution containing a chlorine group such as sodium chloride is common, and the washing water generated by the above-described conventional electrolysis contains at least residual chlorine. . As a result, chlorine adheres to the electrode during long-term use, and thus there is a problem that the electrode needs to be replaced or maintained.
[0007]
The present invention has been made in view of the above-mentioned conventional problems, exhibits an excellent cleaning effect without using a chemical synthetic detergent or the like, does not rust metal materials, and does not require electrode maintenance. Further, it is an object of the present invention to provide a strongly alkaline electrolyzed water capable of simultaneously performing washing and disinfection, a method for producing the same, and a device for producing the same.
[0008]
[Means for Solving the Problems]
The present invention relates to strongly alkaline electrolyzed water, pure water, an aqueous electrolyte solution containing potassium carbonate, and alkaline electrolyzed water generated by electrolysis using an ion exchange membrane that allows only potassium ions to pass through, and has a pH of It has a value of 10.5 or more and 12.5 or less, an oxidation-reduction potential of -900 mV or more, and a dissolved component of potassium carbonate of 1 g / liter or less.
With such a configuration, the strong alkaline electrolyzed water exhibits an excellent cleaning effect without rusting the metal material and without using a chemical synthetic detergent or the like, so that cleaning and disinfection can be performed simultaneously. .
[0009]
Further, in the present invention, it is preferable that the aqueous electrolyte solution does not contain a chlorine group. With this configuration, continuous electrolysis can be performed without chlorine adhering to the electrode as in the related art, that is, without requiring maintenance of the electrode.
[0010]
Further, the present invention relates to a method for producing strongly alkaline electrolyzed water, wherein an ion exchange membrane that allows only potassium ions for partitioning an anode side and a cathode side to be disposed in an electrolytic cell for performing electrolysis is provided, and potassium carbonate is provided on the anode side. Is supplied, pure water is supplied to the cathode side, and the pH value is 10.5 or more and 12.5 or less, the oxidation-reduction potential is -900 mV or more, and dissolved by electrolysis. It is characterized in that the component produces strongly alkaline electrolyzed water of 1 g / liter or less of potassium carbonate.
By such a procedure, an excellent cleaning effect is exhibited without using a chemical synthetic detergent or the like, and the strongly alkaline electrolyzed water that can be washed and sterilized at the same time without rusting the metal material is generated. be able to.
[0011]
Further, in the present invention, it is preferable that the aqueous electrolyte solution does not contain a chlorine group. With such a configuration, strong alkaline electrolyzed water containing no chlorine group can be generated, so that continuous electrolysis can be performed without the need for electrode maintenance.
[0012]
Further, the present invention relates to a strongly alkaline electrolyzed water producing apparatus, wherein an electrolytic cell for performing electrolysis, an ion exchange membrane that allows only potassium ions for partitioning an anode side and a cathode side of the electrolytic cell, and the anode side And a pure water supply means for supplying pure water to the cathode side, and a pH value of 10.5 or more and 12.5 to the cathode side by electrolysis. Hereinafter, the present invention is characterized in that strongly alkaline electrolyzed water having an oxidation-reduction potential of -900 mV or more and a dissolved component of 1 g / liter or less of potassium carbonate is generated.
By configuring in this way, a strong alkaline electrolyzed water that exhibits an excellent cleaning effect without using a chemical synthetic detergent or the like, does not rust the metal material, and can perform cleaning and disinfection simultaneously. Can be generated.
[0013]
Further, in the present invention, it is preferable that the aqueous electrolyte solution does not contain a chlorine group. With such a configuration, strong alkaline electrolyzed water containing no chlorine group can be generated, so that continuous electrolysis can be performed without the need for electrode maintenance.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 9 show an example of an embodiment of the present invention. FIG. 1 is an explanatory diagram showing an outline of generating strongly alkaline electrolyzed water according to an embodiment of the present invention, and FIG. 2 is an alkaline electrolysis according to the present embodiment. FIG. 3 is a diagram illustrating a generation principle showing a schematic configuration of a water producing apparatus, FIG. 3 is an explanatory view showing an electrolysis principle in the alkaline electrolyzed water producing apparatus, FIG. 4 is an illustration showing an electrolytic reaction formula in the alkaline electrolyzed water producing apparatus, and FIG. It is a chart showing the physicochemical property of strongly alkaline electrolyzed water of an embodiment.
[0015]
In this embodiment, as shown in FIG. 1, an ion exchange membrane 5 for partitioning an anode 3 side and a cathode 4 side is disposed in an electrolytic cell 2 for performing electrolysis, and an electrolyte aqueous solution containing potassium carbonate is provided on the anode 3 side. 8, pure water 9 is supplied to the cathode 4 side, and strongly alkaline electrolyzed water (hereinafter, referred to as strong alkaline ionized water) 11 is generated by electrolysis.
[0016]
Specifically, as shown in FIGS. 1 and 2, the strong alkaline ionized water producing apparatus 1 mainly divides an electrolytic cell 2 for performing electrolysis, and an anode 3 side and a cathode 4 side of the electrolytic cell 2. An ion exchange membrane 5 that allows only potassium ions 7 to permeate; a supply pump 13 serving as an aqueous electrolyte solution supplying means for supplying an aqueous electrolyte solution 8 using potassium carbonate 12 as an electrolyte on the anode 3 side; A pure water device 15 is provided as pure water supply means for supplying water.
[0017]
The electrolytic cell 2 is divided into an anode 3 side and a cathode 4 side by an ion exchange membrane 5 disposed in the center of the cell. An electrolytic solution is supplied to the anode 3 side, and the electrolytic solution is supplied to the cathode 4 side. Is supplied with pure water. The ion exchange membrane 5 is a cation exchange membrane, and is configured to transmit only cations.
The strong alkaline ionized water 11 generated by electrolysis in the electrolytic cell 2 is stored in a generated water tank 16.
[0018]
Next, generation of strong alkaline ionized water by the strong alkaline ionized water production device 1 of the present embodiment will be described with reference to the drawings.
As shown in FIG. 3, the electrolytic cell 2 is supplied to the anode 3 with soft water purified from tap water or an aqueous electrolyte solution 8 obtained by adding 0.863 g / l of potassium carbonate 12 to pure water. Is supplied with pure water 9.
During electrolysis, an electrolysis voltage of 4 V and a current value of 12 A are applied between the anode 3 and the cathode 4.
[0019]
On the anode 3 side of the electrolytic cell 2, water is electrolyzed into oxygen (O ₂ ) and hydrogen ions (H ⁺ ) as shown in FIGS. The added potassium carbonate (K ₂ CO ₃ ) 12 combines with hydrogen ions (H ⁺ ) to form potassium hydrogen carbonate (KHCO ₃ ) and potassium ions (K ⁺ ), and further combines with hydrogen ions (H ⁺ ). To form bicarbonate (H ₂ CO ₃ ) and potassium ion (K ⁺ ). The bicarbonate group (H ₂ CO ₃ ) is composed of water (H ₂ O) and carbon dioxide (CO ₂ ).
The generated potassium ions (K ⁺ ) pass through the ion exchange membrane 5 and enter the cathode 4 side.
[0020]
On the other hand, on the cathode 4 side, water is electrolyzed into hydrogen (H ₂ ) and hydroxyl ions (OH ⁻ ). The potassium ions (K ⁺ ) that have entered the cathode 4 combine with the hydroxide ions (OH ⁻ ) to form potassium hydroxide (KOH).
[0021]
As described above, strong alkaline ionized water having a pH value of 10.5 or more and 12.5 or less, an oxidation-reduction potential of -900 mV or more, and a dissolved component of potassium carbonate 1 g / liter or less is generated on the cathode 4 side. .
FIG. 5 shows the physicochemical properties of the generated strong alkaline ionized water.
[0022]
Next, a change in the hydrogen ion concentration of the strongly alkaline ionized water according to the present embodiment will be described with reference to the drawings.
FIG. 6 is a graph showing the temporal change of the hydrogen ion concentration of the strong alkaline electrolyzed water, FIG. 7 is a graph showing the temporal change of the hydrogen ion concentration in spray cleaning of the strong alkaline electrolyzed water, and FIG. FIG. 9 is a graph showing the temporal change of the hydrogen ion concentration in the ultrasonic irradiation of water, and FIG. 9 is a graph showing the change of the hydrogen ion concentration depending on the temperature of the strongly alkaline electrolyzed water.
[0023]
First, the strongly alkaline ionized water of the present embodiment is put into three types of containers having different opening areas, and the hydrogen ion concentration and the oxidation-reduction potential are compared for each elapsed time.
As shown in FIG. 6, the change in the hydrogen ion concentration due to the elapsed time of the strong alkaline ionic water in the three types of containers does not change significantly in any of the containers.
[0024]
Next, changes in the hydrogen ion concentration and the oxygen reduction potential depending on the spraying time when spray cleaning is performed after the temperature of the strongly alkaline ionized water of the present embodiment is raised to 60 ° C. are compared.
As shown in FIG. 7, the hydrogen ion concentration of the strongly alkaline ionized water is kept almost constant regardless of the elapsed time.
[0025]
Next, the change in the hydrogen ion concentration due to the ultrasonic irradiation time when the ultrasonic cleaning irradiation is performed after the temperature of the strongly alkaline ionized water of the present embodiment is raised to 60 ° C. will be compared.
As shown in FIG. 8, the hydrogen ion concentration of the strongly alkaline ionized water is kept almost constant irrespective of the irradiation time.
[0026]
Next, the temperature of the strongly alkaline ionized water of the present embodiment is raised, and changes in the hydrogen ion concentration at each temperature are compared.
As shown in FIG. 9, the hydrogen ion concentration of the strong alkaline ionized water slightly decreased from 40 ° C. to 60 ° C., but was kept almost constant.
[0027]
As described above, the strong alkaline ionized water according to the present embodiment can maintain the detergency for a long time because the hydrogen ion concentration does not decrease with time.
Further, even when the temperature of the alkaline ionized water rises to 60 ° C. or higher, the hydrogen ion concentration does not decrease, so that cleaning at a high temperature becomes possible, and a high cleaning effect can be realized.
[0028]
Next, the cleaning effect of the strong alkaline ionized water of the present embodiment will be described below.
The evaluation of the cleaning effect of the strong alkaline ionized water was performed using a functional formula, and the evaluation was made in three stages of 1, 2, and 3. The larger the numerical value, the higher the cleaning effect.
[0029]
(1) Comparison by Spray Cleaning Grease was attached to a rectangular test piece, and spray cleaning was performed at a cleaning liquid temperature of 60 ° C. and a cleaning time of 5 minutes.
City water: grease is attached to the surface (evaluation 1).
Neutral detergent (3%): Partially attached (Evaluation 2).
Alkaline detergent (3%): Overall washed (evaluation 3).
In the case of strong alkaline ionized water, a cleaning effect almost equivalent to that of an alkaline detergent was confirmed (evaluation 3).
Therefore, according to the strong alkaline ionized water of the present embodiment, a cleaning effect almost equivalent to that of the alkaline detergent can be obtained without using the alkaline detergent.
[0030]
(2) Comparison by ultrasonic cleaning About 0.25 ml of processing oil (mineral oil) was dropped on the surface of a plate-shaped iron piece, placed in a beaker containing 500 ml of cleaning liquid, and ultrasonically washed at a cleaning liquid temperature of 60 ° C. and a cleaning time of 3 minutes. Washing was performed.
City water: Grease is attached to many parts of the surface (Evaluation 1).
Neutral detergent (3%): Grease adheres to almost half of the surface (Evaluation 2).
Alkaline detergent (3%): A small amount of grease is attached to a part (evaluation 3).
In the case of strong alkaline ionized water, a cleaning effect almost equivalent to that of an alkaline detergent was confirmed (evaluation 3).
Therefore, according to the strong alkaline ionized water of the present embodiment, a cleaning effect almost equivalent to that of the alkaline detergent can be obtained without using the alkaline detergent.
[0031]
(3) Comparison by Oxidation-Reduction Potential Difference About 0.25 ml of processing oil (mineral oil) was dropped on the surface of the plate-shaped iron piece, and the resultant was placed in a beaker containing 500 ml of cleaning solution and subjected to ultrasonic cleaning.
Oxidation-reduction potential -55 mV: Partially washed and many not washed (evaluation 1).
Oxidation-reduction potential -850 mV: About half were washed (Evaluation 2).
Therefore, it can be seen that the higher the oxidation-reduction potential, the higher the cleaning effect.
[0032]
(4) Attack to metal Using a piece of iron, a body, and a piece of brass, rub a part of the surface of each test piece with a paper file to expose the fabric, and put it in a beaker containing 300 ml of strong alkaline ionized water. Then, it was left at room temperature for 48 hours to check the change of the surface.
Iron: Discoloration on the surface becomes thin. There is no rust.
Body: Discoloration on the surface becomes thin. There is no rust.
Brass: No change in surface. There is no rust.
Therefore, according to the strong alkaline ionized water of the present embodiment, cleaning can be performed without corroding metals.
[0033]
As described above, according to the present embodiment, an ion exchange membrane that allows only potassium ions to pass therethrough is provided in the electrolytic cell 2 so that only potassium ions pass through to the cathode 4 side. Strong alkaline ionized water can be generated.
[0034]
Further, according to the present embodiment, strong alkaline ionized water is generated by an aqueous electrolyte solution containing no chlorine group, that is, an aqueous electrolyte solution containing potassium carbonate. Therefore, since chlorine does not adhere to the electrode, maintenance of the electrode is unnecessary and continuous electrolysis can be performed.
[0035]
Further, according to the present embodiment, the electrolyte aqueous solution 8 is made using soft water or pure water. However, by using pure water, strong alkali ion water containing no impurities can be generated.
[0036]
Note that the present invention is not limited to the configuration of the ion exchange membrane described in the present embodiment.
[0037]
Further, the present invention can be applied to a cleaning apparatus or the like that uses the strongly alkaline electrolyzed water according to the present invention as a cleaning liquid. For example, as another embodiment, the strong alkaline electrolyzed water producing apparatus according to the present invention may be installed in a conventional car washing machine to perform car washing using strong alkaline water.
[0038]
As shown in FIG. 10, this embodiment is a car wash machine 120 using strong alkaline water as wash water for use in a car wash, provided with a strong alkaline electrolyzed water producing apparatus 100 for generating strong alkaline ionized water. It is.
[0039]
The car washer 120 includes a washing water tank 116 and a used water circulation device 118, and is configured to return the strong alkaline ionized water used for car washing to the washing water tank 116 again by the used water circulation device 118.
A so-called ultrafiltration membrane (not shown) is built in the used water circulating device 118 so as to filter when washing water contaminated by car washing is used. Reference numeral 115 in the figure denotes a pure water apparatus for generating pure water, and 119 denotes a wastewater pit.
[0040]
According to this embodiment, an excellent washing effect can be obtained only by washing the car with strong alkali ion water without using a detergent such as a shampoo for car washing. In addition, since there is no need to perform a step of washing off the detergent, it is also effective in shortening the time for washing the car and saving water.
Furthermore, according to the present embodiment, since the strong alkaline ionized water used for washing is configured to be filtered and reused by the used water circulation device 118 without being discarded, the environment is affected along with the reuse of resources. There is no.
[0041]
The present invention can be applied to general spray-type washing machines, ultrasonic washing machines, and the like, in addition to the above-described car washing machines.
[0042]
【The invention's effect】
As described above, according to the strongly alkaline electrolyzed water of the present invention and the method for producing the same and the device for producing the same, an excellent cleaning effect is exhibited without using a chemically synthesized detergent or the like, without rusting the metal material, In addition, electrode maintenance is not required, and cleaning and sterilization can be performed simultaneously.
[0043]
Specifically, according to the strongly alkaline electrolyzed water of the present invention, it is an alkaline electrolyzed water generated by electrolysis using pure water, an aqueous electrolyte solution containing potassium carbonate, and an ion exchange membrane that allows only potassium ions to permeate. When the pH value is 10.5 or more and 12.5 or less, the oxidation-reduction potential is -900 mV or more, and the dissolved component is 1 g / liter or less of potassium carbonate, the metal material is rusted by the strong alkaline electrolyzed water. Without using a chemical synthetic detergent or the like, an excellent cleaning effect is exhibited, and cleaning and disinfection can be performed simultaneously.
[0044]
In addition, the present invention provides a continuous electric power by preventing chlorine from being attached to the electrode as in the related art by preventing the aqueous electrolyte solution from containing a chlorine group, that is, without requiring maintenance of the electrode. Decomposition becomes possible.
[0045]
Further, according to the method for producing strongly alkaline electrolyzed water of the present invention, an ion exchange membrane that allows only potassium ions for partitioning the anode side and the cathode side to be disposed in the electrolytic cell for electrolysis is provided, and potassium carbonate is provided on the anode side. An aqueous electrolyte solution is supplied, pure water is supplied to the cathode side, and a pH value of 10.5 or more and 12.5 or less, an oxidation-reduction potential of -900 mV or more, and a dissolved component is supplied to the cathode side by electrolysis. Produces strong alkaline electrolyzed water of 1 g / liter or less of potassium carbonate, which provides an excellent cleaning effect without using a chemical synthetic detergent and the like. Strong alkaline electrolyzed water that can be performed simultaneously can be generated.
[0046]
In addition, the present invention is capable of producing a strongly alkaline electrolyzed water containing no chlorine groups by preventing the electrolyte aqueous solution from containing chlorine groups. Becomes possible.
[0047]
Further, according to the strongly alkaline electrolyzed water producing apparatus of the present invention, an electrolytic cell for performing electrolysis, an ion exchange membrane that allows only potassium ions for partitioning the anode side and the cathode side of the electrolytic cell, and the anode side And a pure water supply means for supplying pure water to the cathode side, and a pH value of 10.5 or more and 12.5 to the cathode side by electrolysis. In the following, the oxidation-reduction potential is -900 mV or more, and the dissolved component produces strong alkaline electrolyzed water of 1 g / liter or less of potassium carbonate, thereby exhibiting an excellent cleaning effect without using a chemical synthetic detergent or the like, It is possible to generate strongly alkaline electrolyzed water that can be washed and sterilized at the same time without rusting the metal material.
[0048]
In addition, the present invention is capable of producing a strongly alkaline electrolyzed water containing no chlorine groups by preventing the electrolyte aqueous solution from containing chlorine groups. Becomes possible.
The excellent effects as described above can be obtained.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an outline of generating strongly alkaline electrolyzed water according to an embodiment of the present invention.
FIG. 2 is a generation principle diagram illustrating a schematic configuration of an alkaline electrolyzed water producing apparatus according to the present embodiment.
FIG. 3 is an explanatory view showing the principle of electrolysis in the alkaline electrolyzed water producing apparatus.
FIG. 4 is an illustration showing an electrolytic reaction formula in the alkaline electrolyzed water producing apparatus.
FIG. 5 is a table showing physicochemical properties of strongly alkaline electrolyzed water of the present embodiment.
FIG. 6 is a graph showing a temporal change of a hydrogen ion concentration of the strong alkaline electrolyzed water.
FIG. 7 is a graph showing a temporal change of a hydrogen ion concentration in spray cleaning of the strong alkaline electrolyzed water.
FIG. 8 is a graph showing a temporal change of a hydrogen ion concentration in ultrasonic irradiation of the strong alkaline electrolyzed water.
FIG. 9 is a graph showing a change in hydrogen ion concentration depending on the temperature of the strong alkaline electrolyzed water.
FIG. 10 is an explanatory view showing an outline of a car washer utilizing the present invention.
[Explanation of symbols]
1, 100 Strong alkaline ionized water producing apparatus 2 Electrolyzer 3 Anode 4 Cathode 5 Ion exchange membrane 7 Potassium ion 8 Electrolyte aqueous solution 9 Pure water 11 Strong alkaline ionized water 12 Potassium carbonate 13 Supply pump 15 Pure water device 16 Generated water tank

Claims (7)

Pure water, an electrolytic aqueous solution containing potassium carbonate, and alkaline electrolyzed water generated by electrolysis using an ion exchange membrane that allows only potassium ions to permeate. Strong alkaline electrolyzed water having an oxidation-reduction potential of -900 mV or more and a dissolved component of potassium carbonate of 1 g / liter or less. The strong alkaline electrolyzed water according to claim 1, wherein the aqueous electrolyte solution does not contain a chlorine group. An ion exchange membrane that allows only potassium ions that partition the anode side and the cathode side to be disposed in the electrolytic cell that performs electrolysis,
Supply an aqueous electrolyte solution containing potassium carbonate to the anode side,
Supplying pure water to the cathode side,
A strong alkaline electrolyzed water having a pH value of 10.5 or more and 12.5 or less, an oxidation-reduction potential of -900 mV or more, and a dissolved component of 1 g / liter or less of potassium carbonate is generated on the cathode side by electrolysis. Strong alkaline electrolyzed water production method. The method for producing strongly alkaline electrolyzed water according to claim 3, wherein the aqueous electrolyte solution does not contain a chlorine group. An electrolytic cell that performs electrolysis, an ion exchange membrane that allows only potassium ions to partition the anode side and the cathode side of the electrolytic cell, and an electrolytic aqueous solution supply unit that supplies an electrolytic aqueous solution containing potassium carbonate to the anode side. A pure water supply means for supplying pure water to the cathode side,
A strong alkaline electrolyzed water having a pH value of 10.5 or more and 12.5 or less, an oxidation-reduction potential of -900 mV or more, and a dissolved component of 1 g / liter or less of potassium carbonate is generated on the cathode side by electrolysis. Strong alkaline electrolyzed water production equipment. The strong alkaline electrolyzed water producing apparatus according to claim 5, wherein the aqueous electrolyte solution does not contain a chlorine group. The strongly alkaline electrolyzed water producing apparatus according to claim 5, further comprising a pure water device that generates pure water as the pure water supply unit.

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