JP2022134607A - PRODUCTION DEVICE OF HIGH pH SOLUTION AND PRODUCTION METHOD OF THE SOLUTION - Google Patents

Abstract

To provide a production device of a solution capable of producing a high pH solution by a method that cost and environmental load are low and to provide a production method of the solution.SOLUTION: A device producing a high pH solution from carbonated water having a hydrogen ion exchange membrane selectively permeating hydrogen ions in the carbonated water and electrodes disposed while sandwiching the hydrogen ion exchange membrane and a production method of the solution are provided. Consequently, the desired high pH solution can be produced by the method that cost and environmental load are low as a starting material of the weak carbonated water.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a high pH solution manufacturing apparatus and a solution manufacturing method thereof. In particular, the present invention relates to a high-pH solution manufacturing apparatus equipped with a hydrogen ion exchange membrane and a method for manufacturing the solution.

In recent years, environmental changes due to acidification of rivers, oceans and soil have become a problem. Increased atmospheric carbon dioxide is thought to be a major contributor to ocean acidification. In addition, acid rain containing sulfur dioxide and nitrogen oxides discharged from factories is said to be the main cause of acidification of rivers and soil. There are strong concerns about the impact on ecosystems due to the acidification of these rivers and oceans, and damage to forests due to acid rain is also a serious problem. Furthermore, soil acidification has a great influence on the growth of crops in terms of sustainable agriculture.

Regarding the problem of carbon dioxide, it is considered to be a major cause of global warming, and it is an urgent issue to suppress the emission of carbon dioxide into the environment worldwide. On the other hand, countermeasures against the acidification of rivers, oceans, and soils that are currently occurring are urgently needed. For example, with regard to the problem of acidification of rivers, local governments are taking the lead in projects to neutralize acidified rivers by flowing limestone powder (calcium carbonate). However, caustic soda (NaOH) used for neutralizing such acidic wastewater is a deleterious substance that is difficult to handle. , quicklime (calcium oxide) and the like have drawbacks such as many of them being insoluble. In addition, as a measure for the environment, solving the problem of cost has become a major issue due to its scale.

As a means for optimizing the pH with a view to normalizing such an environment that tends to be acidic, for example, Patent Document 1 discloses a high-pH electrolytic cell using a diaphragm. Producing alkaline electrolyzed water is described.

JP 2014-171965 A

As described in Patent Document 1, when producing alkaline electrolyzed water, an electrolyte that mediates electron transfer is required, and a solution such as K ₂ CO ₃ or NaHCO ₃ is used as an electrolyte solution from which it is derived. there is In such a case, there are concerns about an increase in cost due to the purchase of chemicals, an environmental load due to metal ions contained in the electrolyte solution, and an impact on the ecosystem.
Therefore, there is a demand for a low-cost, low-environmental load technology capable of optimizing the pH of acidified rivers, oceans, and soil.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a solution manufacturing apparatus capable of manufacturing a high-pH solution and a method for manufacturing the solution in a low-cost, environment-friendly manner.

As a result of intensive studies on the above problems, the present inventor applied a voltage to raw water in which carbonic acid was dissolved in a treatment tank separated by a hydrogen ion exchange membrane, and hydrogen ions were transferred to the cathode side through the hydrogen ion exchange membrane. The inventors have found that the pH of the solution on the anode side can be raised in a short period of time by the movement, thus completing the present invention.
That is, the present invention is the following solution manufacturing apparatus and solution manufacturing method.

A solution manufacturing apparatus of the present invention for solving the above problems is an apparatus for manufacturing a high pH solution from carbonated water, comprising a hydrogen ion exchange membrane that selectively permeates hydrogen ions in carbonated water; and electrodes arranged with an exchange membrane interposed therebetween.
According to this solution manufacturing apparatus, a hydrogen ion exchange membrane is provided so as to be sandwiched between electrodes, and a voltage is applied to quickly move hydrogen ions ionized from carbonated water to the cathode side through the hydrogen ion exchange membrane. It is possible to raise the pH of the carbonated water on the anode side in a short period of time to produce a solution with a high pH. In addition, since chemicals containing metal ions, which may cause environmental impact, are not used, it is possible to produce a low-cost, low-environmental-impact, high-pH solution.

Further, one embodiment of the solution manufacturing apparatus of the present invention is characterized in that the carbonated water is obtained by dissolving carbon dioxide in raw water.
According to this feature, by using carbonated water in which carbon dioxide is dissolved, it is possible to more reliably produce a solution with a high pH through the movement of hydrogen ions.
In the carbonated water in which carbon dioxide is dissolved in the raw water, part of the carbonic acid is ionized into hydrogen ions and bicarbonate ions due to the state of equilibrium between carbon dioxide and carbonic acid. Furthermore, bicarbonate ions are ionized into hydrogen ions and carbonate ions. Therefore, since carbonated water contains hydrogen in an ionic state, it can be used as a source of hydrogen ions. In addition, by using carbonated water as a hydrogen ion source, the hydrogen ions move through the hydrogen ion exchange membrane, so that the chemical equilibrium related to the dissolution of carbon dioxide in the aqueous solution on the anode side is in the direction of producing carbonate ions. the reaction proceeds to In addition, "carbonated water" in the present invention refers to a solution in which carbon dioxide is dissolved.

In one embodiment of the solution manufacturing apparatus of the present invention, the raw water is fresh water (river water, tap water, rain water) or pure water.
In general, seawater in a natural environment may contain a large amount of substances such as metal ions, which have a large environmental load and may hinder the effects of the present invention. On the other hand, fresh water (river water, tap water, rain water) or pure water contains or does not contain these metal ions and the like to an insignificant extent.
According to this feature, the carbonated water used in the present invention can be made free of many metal ions and the like, and it becomes possible to efficiently produce a solution with a low environmental load and a high pH.

The solution production method of the present invention for solving the above problems is a method for producing a solution with a high pH from carbonated water, using a hydrogen ion exchange membrane that selectively permeates hydrogen ions and an electrode, A voltage is applied to the carbonated water to permeate hydrogen ions in the carbonated water through the hydrogen ion exchange membrane.
According to this solution manufacturing method, a hydrogen ion exchange membrane is provided so as to be sandwiched between electrodes, and a voltage is applied to quickly move hydrogen ions ionized from carbonated water to the cathode side through the hydrogen ion exchange membrane. It is possible to raise the pH of the carbonated water on the anode side in a short period of time to produce a solution with a high pH. In addition, since chemicals containing metal ions, which are of concern for environmental impact, are not used, it is possible to manufacture a solution with low environmental impact at low cost.

ADVANTAGE OF THE INVENTION According to this invention, the solution manufacturing apparatus which can manufacture the solution with high pH by the low-cost and environment-friendly technique, and the manufacturing method of the solution can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic explanatory drawing of the solution manufacturing apparatus which concerns on the 1st embodiment of this invention. FIG. 2 is a schematic explanatory diagram showing an example of the mode of hydrogen ion movement in the solution manufacturing apparatus according to the first embodiment of the present invention; It is a schematic explanatory drawing of the solution manufacturing apparatus which concerns on the 2nd embodiment of this invention. FIG. 5 is a schematic explanatory diagram of a solution production apparatus showing an example of hydrogen generation mode in the solution production apparatus according to the third embodiment of the present invention; It is a schematic explanatory drawing of the solution manufacturing apparatus which concerns on the 4th embodiment of this invention.

EMBODIMENT OF THE INVENTION Hereinafter, the embodiment of the solution manufacturing apparatus which concerns on this invention is described in detail, referring drawings. Also, the explanation of the solution manufacturing method according to the present invention shall be replaced with the explanation related to the operation of the solution manufacturing apparatus according to the present invention.
It should be noted that the solution manufacturing apparatus and solution manufacturing method described in the embodiments are merely examples for explaining the solution manufacturing apparatus and solution manufacturing method according to the present invention, and are not limited thereto.

(Solution manufacturing method)
A solution manufacturing apparatus of the present invention is for manufacturing a solution having a high pH. Specifically, by moving hydrogen ions generated by ionization equilibrium in carbonated water through a hydrogen ion exchange membrane, the pH of carbonated water after hydrogen ion transfer is increased, and the pH is higher than before hydrogen ion transfer. A smooth solution is obtained.

Carbonated water that can be used in the present invention is not particularly limited in its origin, as long as it is an aqueous solution in which carbon dioxide is dissolved. Carbon dioxide may be artificially dissolved in raw water, or carbon dioxide may be dissolved from the beginning. Examples of raw water that can be used include natural resources such as river water, lake water, groundwater, rainwater, and seawater, as well as tap water, pure water, wastewater from factories, and leachate from landfill sites. be done.

The present invention can also be used for the purpose of optimizing the pH of acidified seawater, waste water from factories, leachate from landfill sites, and the like. However, in view of the problem of producing a low-cost, environmentally-friendly solution, fresh water containing as little as possible metal ions, halogen (fluorine, chlorine, boron, etc.) compounds, and other substances that may cause unintended reactions (River water, tap water, rain water) or pure water is preferably used as raw water as a starting material. A high pH solution obtained from these raw waters may be used separately for optimizing the pH. It may be circulated. For example, by installing the solution manufacturing apparatus of the present invention on land near a river where acidification is a problem, it is possible to use raw water at a minimum transportation cost. Therefore, it is possible to greatly reduce the cost and energy required for procuring raw water.

In carbonated water, when carbon dioxide (CO ₂ ) is dissolved in water (H ₂ O), a chemical equilibrium formula as shown in Formula 1 generally holds.

As shown in Equation 1, when carbon dioxide is dissolved in water, after reaching equilibrium with carbonic acid (H ₂ CO ₃ ), some of the carbonic acid ionizes into hydrogen ions and bicarbonate ions (HCO ₃ ⁻ ). . Furthermore, bicarbonate ions are ionized into hydrogen ions and carbonate ions (CO ₃ ²⁻ ). Therefore, since hydrogen is contained in an ionic state in an aqueous solution in which carbon dioxide is dissolved, hydrogen ions can be transferred through the hydrogen ion exchange membrane. Further, in the carbonated water after the hydrogen ions have migrated, the reaction proceeds in the direction of producing carbonate ions (CO ₃ ²⁻ ) in the chemical equilibrium shown by Formula 1. In the present invention, although weakly acidic carbonated water is used as a starting material, an instantaneous increase in the pH of the solution is observed upon application of a voltage, and the pH reaches about 10.

Another feature of the present invention is low power consumption. If the concentration gradient of the hydrogen ion concentration across the hydrogen ion permeable membrane can complete the increase in pH, the application of voltage is not essential. However, for the purpose of producing an alkaline solution, application of voltage is required for rapid reaction. Even in this case, it is not necessary to apply enough voltage to generate hydrogen on the cathode side. For example, if the minimum voltage required for ionizing water is applied, the reaction proceeds in a short time, and the pH of the solution can reach the alkaline side. Therefore, the solution manufacturing method and the manufacturing method of the present invention are effective in realizing low power consumption and low cost.

[First embodiment]
FIG. 1 is a schematic explanatory diagram showing the structure of a solution manufacturing apparatus 1A according to the first embodiment of the present invention.
As shown in FIG. 1, the solution manufacturing apparatus 1A in this embodiment has a processing tank 10, and a hydrogen ion exchange membrane 12 is provided in the processing tank 10. As shown in FIG. The hydrogen ion exchange membrane 12 is provided with a pair of electrodes (electrodes 11a and 11b). As shown in FIG. 1, the inside of the processing tank 10 has a side (first chamber 13a) where carbon dioxide is introduced and a side (second chamber 13a) through which hydrogen ions generated by ionization permeate through a hydrogen ion exchange membrane 12. It is divided into two chambers 13b).
Further, a line L1 for introducing raw water S0 and a line L2 for introducing carbon dioxide (CO ₂ ) into the _first chamber 13a are connected to the treatment bath 10 . More specifically, the line L1 is arranged to connect with the upper space 14a of the first chamber 13a and the upper space 14b of the second chamber 13b, and the line L2 is connected to the raw water _S0 of the second chamber 13b. It is arranged so that carbon (carbon dioxide-containing gas) can be introduced.

Note that the arrangement of the lines L1 and L2 is not limited to this. For example, the introduction of the raw water _S0 through the line L1 is configured to connect only to the first chamber 13a. An aqueous solution may be introduced. As a result, ion migration occurs based on the principle of electrodialysis, and there is also the advantage that the migration speed of hydrogen ions through the hydrogen ion exchange membrane 12 can be increased, and the time required for raising the pH of the solution can be shortened. Also, the configuration and mode of introduction of carbon dioxide are not limited. For example, it may be connected to the space 14a, and by pressurizing or depressurizing the first chamber 13a, the concentration of carbon dioxide dissolved in the raw water _S0 can be adjusted according to the pH of the target solution. may be configured. Alternatively, a configuration may be adopted in which fine bubbles of carbon dioxide are generated from the lower portion of the first chamber 13a so that the solubility of carbon dioxide can be kept uniform at any time.

Here, the supply source (or generation source) of carbon dioxide is not particularly limited. Specific examples of carbon dioxide supply sources include gases containing carbon dioxide that are emitted from various facilities (power generation facilities, factories, general households, etc.) and means of transportation in the course of daily life and industrial activities, as well as the atmosphere. gas containing naturally occurring carbon dioxide such as volcanic gas and volcanic gas. In addition, when sufficient carbon dioxide is dissolved in the raw water _S0 from the beginning to the extent that a solution with a desired pH is obtained, the configuration for introducing carbon dioxide may be omitted.

The treatment tank 10 may be of any material and shape as long as it is provided with a hydrogen ion exchange membrane 12 and is formed so as to be able to store the raw water _S0 . Examples include the use of materials and shapes used in structures known as electrolytic cells and electrodialysis cells.

The electrodes 11a and 11b are provided on or near the surface of the hydrogen ion exchange membrane 12, and are electrically connected to the voltage application unit 50 using conducting wires. The electrodes 11 a and 11 b in this embodiment are used for applying current from the voltage application unit 50 for the movement of hydrogen ions through the hydrogen ion exchange membrane 12 .

The electrodes 11a and 11b are not particularly limited in material and shape as long as they function as anodes or cathodes. Examples of materials for the electrodes 11a and 11b include carbon and metals (gold, platinum, silver, palladium, gallium, stainless steel, copper, etc.) that are widely used as electrode materials in the electrochemical field. Examples of the shape of the electrodes 11a and 11b include a plate shape, a rod shape, a mesh shape, and an electrode substrate obtained by coating a conductive substrate with particulate metal particles. Since the electrodes 11a and 11b are provided on or near the surface of the hydrogen ion exchange membrane 12, it is preferable that the electrodes 11a and 11b have a shape capable of suppressing inhibition of mass transfer to the hydrogen ion exchange membrane 12. FIG. Therefore, the shape of the electrodes 11a and 11b in this embodiment includes, for example, a mesh shape and a thin bar shape such as a wire. Further, another example of the electrodes 11a and 11b includes those in which an electrode pattern is formed directly on the surface of the hydrogen ion exchange membrane 12 by a technique such as plating. At this time, the shape of the electrode pattern is not particularly limited, but it is preferable to be able to suppress inhibition of mass transfer to the hydrogen ion exchange membrane 12 .

The configuration and function of the voltage application unit 50 are not particularly limited. Further, as described above, if a solution having a desired pH can be obtained by the movement of hydrogen ions due to the concentration gradient of hydrogen ions, the voltage applying unit may not be provided. As a form of voltage application, it is preferable that the output can be adjusted according to the progress of the reaction in the treatment tank 10 as a DC power supply, and it is possible to use renewable energy such as solar cells, wind power, wave power, and surplus power in other facilities. It is preferable to use electric power. This makes it possible to reduce the energy used in the manufacturing process of the solution. In particular, in the case of using renewable energy that does not emit carbon dioxide when generating electricity, there is an effect that it is possible to promote the suppression of carbon dioxide emissions.

The hydrogen ion exchange membrane 12 is a membrane that can selectively permeate hydrogen ions.
In this embodiment, for example, the hydrogen ion exchange membrane 12 may have a function of allowing only hydrogen ions to pass therethrough, and specific components and structures are not particularly limited, and known membranes may be used. can be done. For example, there is a perfluorocarbon material composed of a hydrophobic Teflon (registered trademark) skeleton made of carbon-fluorine and a perfluoro side chain having a sulfonic acid group. In addition, depending on the conditions for performing the hydrogen recovery process, such as when it is clear that the monovalent cations contained in the raw water _S0 are only hydrogen ions, monovalent cations are selected as the hydrogen ion exchange membrane 12. It is also possible to use a membrane that has been treated so that it can be selectively permeated (so-called monovalent ion selective membrane) or a cation exchange membrane containing divalent cations. At this time, the specific components and structures constituting the monovalent ion selective membrane and the cation exchange membrane are not particularly limited, and known ones can be used.

The solution manufacturing apparatus 1A selectively permeates hydrogen ions from carbonated water obtained by dissolving carbon dioxide in raw water _S0 through a hydrogen ion exchange membrane 12 to manufacture a high pH solution. More specifically, the solution manufacturing apparatus 1A introduces carbon dioxide (carbon dioxide-containing gas) into the processing tank 10 supplied with the raw water _S0 , and introduces carbon dioxide (carbon dioxide-containing gas) into the processing tank 10 via the hydrogen ion exchange membrane 12. The produced hydrogen ions are selectively permeated from the space 14a to the space 14b to raise the pH of the carbonated water to produce a solution with a high pH.

A manufacturing process of a solution having a high pH in the solution manufacturing apparatus 1A of this embodiment will be described based on FIG.
FIG. 2 is a schematic explanatory diagram showing the solution manufacturing process in the solution manufacturing apparatus 1A of this embodiment. The structure inside the processing tank 10 in FIG. ₂ is the same as the structure shown in FIG. Carbon dioxide (carbon dioxide-containing gas) is introduced into the chamber 13a via a line L2, and the chamber 13a is in a state of dissolving carbon dioxide (carbonated water). Note that FIG. 2 shows only the movement of ions related to hydrogen ions, and omits illustration of other ions.

As shown in FIG. ₂ , the raw water S0 introduced into the treatment tank 10 via the line L1 contains carbonic acid, bicarbonate ions, carbonate ions, and hydrogen ions produced by dissolving carbon dioxide. Then, due to the ion concentration gradient and electrodialysis due to the voltage applied by the voltage application unit 50, the hydrogen ions in the first chamber 13a permeate the hydrogen ion exchange membrane 12 and move to the second chamber 13b side. do. Then, due to the movement of hydrogen ions, the pH of the solution in the first chamber 13a on the anode side rises. Its pH quickly rises to about 10, even though weakly acidic carbonated water is used as a starting material. Although the reason for this is not necessarily clear, with the movement of hydrogen ions originating from carbonated water to the cathode side, the hydrogen ions supplied by the ionization of water in the first chamber 13a serving as the anode side also become hydrogen. It is assumed that water moves to the second chamber 13b on the cathode side through the ion exchange membrane, and the ionization reaction of water to generate hydroxide ions (OH ⁻ ) on the anode side progresses at any time.

There are no particular restrictions on the handling of the solution containing many hydrogen ions generated in the second chamber 13b. As will be described later, by setting the applied voltage to be equal to or higher than the electrolysis voltage, electrons can be donated from the electrode 11b to the hydrogen ions in the second chamber 13b and recovered in the form of hydrogen (H ₂ ). Alternatively, the solution in the second chamber 13b may be collected and transferred to a storage facility for storage, or may be transferred directly to a use point for use as an energy source.

In addition, the solution manufacturing apparatus 1A is not limited to the structure shown in FIGS. 1 and 2, and various means for efficiently manufacturing the solution may be added. Examples of such means include, for example, means for suppressing the formation of precipitates on the surfaces of the electrodes 11a and 11b, and means for suppressing reduction in the ion permeation efficiency of the hydrogen ion exchange membrane 12. means, etc.

As described above, according to the solution manufacturing apparatus 1A of the present embodiment and the solution manufacturing method using the solution manufacturing apparatus 1A, only hydrogen ions are allowed to permeate through the hydrogen ion exchange membrane from raw water in which carbon dioxide is dissolved, and then pH By recovering the solution with increased pH, carbonated water that does not contain substances with a large environmental load such as metal ions as much as possible can be obtained without using a large amount of electricity and without increasing the amount of metal ions contained in the raw water. It becomes possible to obtain a high solution. Therefore, it is possible to produce a high-pH solution with a small environmental burden and at a low cost.

In this embodiment, the case where acidic raw water becomes alkaline treated water is exemplified. However, the present invention only needs to be able to increase the pH of raw water, and can be applied even when acidic raw water becomes acidic treated water, and alkaline raw water becomes alkaline treated water.

FIG. 3 is a schematic explanatory diagram showing a solution manufacturing apparatus according to the second embodiment of the present invention. FIG. 3 shows a dissolution tank 30 provided as means for dissolving carbon dioxide in the raw water _S0 in the first embodiment.

As shown in FIG. 3, the solution manufacturing apparatus 1B in this embodiment connects a line L2 for introducing carbon dioxide (carbon dioxide-containing gas) to the dissolution tank 30, and as a pretreatment for the reaction in the treatment tank 10, carbon dioxide It is configured so that carbon can be dissolved in raw water _S0 in advance. Further, by connecting the dissolution tank 30 and the first chamber 13a of the treatment tank 10, the raw water _S0 in which carbon dioxide is dissolved can be used for the reaction in the treatment tank 10 as carbonated water. The mode of connection of the line L2 to the dissolving tank 30 is not particularly limited, and may be connected to the upper space of the dissolving tank 30. may be configured to occur. As a result, it is possible to ensure the dissolution of carbon dioxide, and at the same time, it is possible to appropriately prepare uniform carbonated water as a pretreatment for use in the reaction.

Moreover, the function and mode of the dissolving tank 30 are not limited. In order to adjust the solubility of carbon dioxide in the raw water _S0 , the dissolving tank 30 may be configured to be pressurized or depressurized, or the temperature thereof may be adjusted. Furthermore, in addition to the purpose of dissolving carbon dioxide, substances contained in the raw water _S0 that are unfavorable for the reaction in the treatment tank 10, and when using the obtained solution for adjusting the pH, environmental load It is also possible to carry out a pretreatment for removing substances that may become obstacles. For example, the metal ions contained in the raw water _S0 may be removed by precipitating.

As described above, the solution manufacturing apparatus 1B in this embodiment dissolves carbon dioxide in the carbon dioxide of the carbonated water used as pretreatment for the reaction in the treatment tank 10, and at the same time causes an environmental load, or , it is possible to remove substances that cause undesired reactions, so that the quality of the obtained high-pH solution can be significantly improved.

FIG. 4 is a schematic explanatory diagram showing a solution manufacturing apparatus according to the third embodiment of the present invention. In addition, FIG. 4 shows that the first embodiment has a batch type configuration in which a certain amount of raw water _S0 is used as one unit and processing is performed for each unit. , shows an example of a continuous system configuration in which hydrogen is generated by an electrolytic reaction and at the same time, a solution with an increased pH is recovered as a post-treatment solution.

As shown in FIG. 4, in the solution manufacturing apparatus 1C of the present embodiment, electrons are donated from the electrode 11b to the hydrogen ions that have passed through the hydrogen ion exchange membrane 12, so that the hydrogen ions are converted into hydrogen ( H ₂ ). Hydrogen generated in the space 14b is discharged from the system by connecting a line L5 to the second chamber 13b on the cathode side where hydrogen is generated. At this time, the provided electrodes 11a and 11b may apply a voltage from a DC power supply so that at least the electrodes 11b can donate electrons to the hydrogen ions.

Further, by connecting the line L4 to the first chamber 13a, the post-treatment solution S on the anode side whose pH has increased is allowed to flow out of the system. _At the same time, as the post-treatment solution S is discharged, the raw water S0 can be appropriately replenished into the first chamber 13a. Therefore, the concentration of cations in the second chamber 3b decreases due to the release of hydrogen, and ion migration due to the concentration gradient of hydrogen ions progresses simultaneously with hydrogen ion migration based on the principle of electrodialysis. The ionization equilibrium of can also proceed rapidly toward the formation of hydrogen ions, bicarbonate ions, and carbonate ions. Therefore, it becomes possible to continuously produce the post-treatment solution S having a high pH.

In this case, a detector for measuring the pH at the outflow port of the solution S after treatment, a detector for measuring the pressure at the hydrogen discharge port, etc. are provided to detect the amount and timing of release of the solution S after treatment, and the replenishment of raw water _S0 . A control system may be provided to control the timing, amount of replenishment, and the like.

In addition, the mode of recovery and utilization of the recovered hydrogen is not limited. For example, the generated hydrogen gas may be transferred to a storage facility and stored, or may be transferred directly to a point of use and used as an energy source. On the other hand, if the energy of hydrogen generated by the voltage application of this embodiment is used, further energy saving and power saving of the present invention can be achieved.

On the other hand, it may be recovered as a hydrogen ion solution without generating hydrogen. For example, a line for discharging the generated hydrogen ion solution can be provided in the lower part of the second chamber 13b to discharge it out of the system, transfer it to a storage facility, and store it. Further, when necessary, a voltage may be applied to the hydrogen ion solution to generate hydrogen, which may be used as an energy source or the like.

Moreover, the electrodes 11 a and 11 b are preferably provided near the hydrogen ion exchange membrane 12 . As a result, the hydrogen ions that permeate the hydrogen ion exchange membrane 12 can be converted into hydrogen more efficiently, and the efficiency of recovering hydrogen can be improved.

Furthermore, the solution manufacturing apparatus 1C is placed near fresh water sources such as acidified rivers, lakes, and factory wastewater, and the raw water _S0 is collected from the rivers, etc., and the treated solution S is circulated by flowing it back into the rivers. It can also be used as a system for environmental conservation and optimization.

As described above, the solution manufacturing apparatus 1C in this embodiment generates hydrogen on the cathode side and discharges it out of the system, and at the same time, enables the treated solution to be discharged sequentially, thereby continuously producing a solution having a high pH. can be produced efficiently.

FIG. 5 is a schematic explanatory diagram showing a solution manufacturing apparatus 1D according to the fourth embodiment of the present invention.
As shown in FIG. ₅ , the solution manufacturing apparatus 1D of this embodiment introduces raw water S0 only into the first chamber 13a through the line L1, and introduces gas into the second chamber 13b.

The gas introduced into the second chamber 13b is not particularly limited as long as it does not react with hydrogen and has a higher specific gravity than hydrogen. Therefore, although a specific gas may be introduced into the second chamber 13b, it is preferable to introduce air under atmospheric pressure into the second chamber 13b from the viewpoint of the cost of gas supply. As a result, the hydrogen ions that permeate the hydrogen ion exchange membrane 12 are converted into hydrogen gas by electron donation from the electrode 11b, and quickly rise in the second chamber 13b. Therefore, it is possible to easily recover hydrogen through the line L5. Furthermore, it is possible to easily separate other components (gases) in the second chamber 13b from the hydrogen gas. This makes it possible to obtain hydrogen of high purity with higher efficiency.

When gas (air) is introduced into the second chamber 13b, one surface of the electrode 11c is in contact with the gas and the other surface is in contact with carbonated water (liquid). Therefore, it is preferable that the electrode 11c has a form suitable as a so-called air cathode. Forms suitable for air cathodes include, for example, having both gas permeable and water impermeable properties. Specific examples of such an electrode 11c include those made of carbon fiber, and those subjected to surface treatment such as applying a material having gas permeability and water impermeability to the metal mesh surface or laminating a film. mentioned. Note that the term "impermeable" as used herein refers to impermeability to water. It is included.

The solution manufacturing process using the solution manufacturing apparatus 1D of this embodiment can be carried out in the same manner as the solution manufacturing process of the third embodiment, except that hydrogen is recovered in gas.

As described above, with the solution manufacturing apparatus 1D and the solution manufacturing method using the solution manufacturing apparatus 1D of the present embodiment, hydrogen can be easily recovered, and hydrogen with high purity can be obtained more efficiently. It becomes possible.

In addition, the embodiment mentioned above shows an example of a solution manufacturing apparatus and a solution manufacturing method. The solution manufacturing method and the solution manufacturing method according to the present invention are not limited to the above-described embodiments, and the solution manufacturing apparatus and the solution manufacturing method according to the above-described embodiments are not limited to the scope of the claims. Configurations may be interchanged or modified.

For example, in the solution manufacturing method and solution manufacturing method of the present embodiment, the number of hydrogen ion exchange membranes to be provided is not limited to one. For example, by increasing the number of membranes and increasing the number of compartments corresponding to the hydrogen recovery unit and the solution production tank, it is intended to improve the efficiency of hydrogen recovery and solution production, and to increase the scale of hydrogen recovery processing and solution production processing. may be

In addition, in the solution manufacturing apparatus and the solution manufacturing method of this embodiment, a layer filled with an ion exchange resin may be used instead of the ion exchange membrane. This makes it easy to control the thickness of the layer through which ions are transmitted according to the component to be transmitted.

Furthermore, the solution obtained by the solution manufacturing apparatus and the solution manufacturing method in this embodiment is not limited to an alkaline solution. For example, a solution with a pH higher than that of adjusted carbonated water can be produced, and an acidic solution can also be obtained. A solution having a desired pH can be produced by adjusting the concentration gradient of hydrogen ions in the solution separated by the hydrogen ion exchange membrane and the applied voltage.

In addition, in the solution manufacturing method and the solution manufacturing method of the present embodiment, any one or two or more of the spaces (first chamber to second chamber) formed by the ion exchange membranes may contain an ion exchange resin (cation exchange resin or anion exchange resin, or both). By combining an ion-exchange membrane and an ion-exchange resin, it is possible to increase the ion transfer rate and improve the concentration efficiency. In addition, similar to the technology known as Electrodeionization (EDI), it is possible to facilitate (or eliminate) regeneration of ion exchange membranes and ion exchange resins.

Moreover, in the solution manufacturing apparatus of this embodiment, the arrangement of the electrodes is not limited to both ends of the hydrogen ion permeable membrane in the treatment tank. For example, it may be arranged at a certain distance from the hydrogen ion permeable membrane. Also, a plurality of electrodes may be provided, and they may be evenly arranged so that the reaction occurs uniformly throughout the processing tank.

The solution production apparatus and solution production method of the present invention are characterized by low environmental load and low cost, and are suitable for large-scale production of high pH solutions for the purpose of normalizing an acidified environment. can be used. In addition, by using acidified freshwater as raw water and circulating it in freshwater, or by spraying the obtained solution over acidified rivers, lakes, forests, and oceans, it is also suitable as a device and method for eliminating acidification. can be used.
At the same time, the solution production apparatus and the solution production method of the present invention convert carbon dioxide taken into the solution into carbonate ions, generate metal ions and carbonates, and are suitably used as part of a system for fixing carbon dioxide. can also

1A, 1B, 1C, 1D solution manufacturing apparatus 10 treatment tank 11a, 11b, 11c electrode 12 hydrogen ion exchange membrane 13a first chamber 13b second chamber 14a, 14b space 30 dissolution tank 50 voltage application Unit, L1 to L5 line, S ₀ raw water, S solution after treatment

Claims (4)

An apparatus for producing a high pH solution from carbonated water,
a hydrogen ion exchange membrane that selectively permeates hydrogen ions in carbonated water;
electrodes arranged with the hydrogen ion exchange membrane interposed therebetween;
A solution manufacturing apparatus comprising: 2. The solution manufacturing apparatus according to claim 1, wherein said carbonated water is obtained by dissolving carbon dioxide in raw water. 3. The solution manufacturing apparatus according to claim 1, wherein said raw water is fresh water or pure water. A method for producing a high pH solution from carbonated water, comprising:
Using a hydrogen ion exchange membrane that selectively permeates hydrogen ions and an electrode,
Apply voltage to carbonated water,
A method for producing a solution, characterized in that the hydrogen ions in the carbonated water are permeated through the hydrogen ion exchange membrane.

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