Multichannel membrane module system for carbon dioxide capture from seawater using redox-mediated bipolarmembrane electrodialysis

Abstract

The present invention relates to a multichannel membrane module system for carbon dioxide capture from seawater using redox-mediated bipolarmembrane electrodialysis. According to the present invention, carbon dioxide in seawater can be captured through the multichannel membrane module system that can be driven by a small potential difference through oxidation and reduction reactions of redox substances by using redox-mediated bipolarmembrane electrodialysis (RBED), and the captured carbon dioxide can be stored as carbonate minerals. In the multichannel membrane module system using redox-mediated bipolarmembrane electrodialysis, inexpensive electrodes can be stacked instead of membranes during scale-up to achieve cost-effectiveness and facilitate channel stacking.

Description

A multi-channel membrane module system for carbon dioxide capture from seawater using a redox-based bipolar electrodialysis process.

[0001] The present invention relates to a multi-channel membrane module system for capturing carbon dioxide from seawater using a redox-based bipolar electrodialysis process, and more particularly, to a multi-channel membrane module system for capturing carbon dioxide from seawater using a redox-mediated bipolar membrane electrodialysis (RBED) process, which captures carbon dioxide (CO2) from seawater through a multi-channel membrane module system that can be driven by a low potential difference through an oxidation-reduction reaction of a redox substance, stores the captured carbon dioxide as a carbonate mineral, and further secures economic feasibility by stacking inexpensive electrodes instead of stacking separation membranes during scale-up.

[0002] Existing carbon dioxide capture technologies include 1) wet capture, 2) dry capture, and 3) membrane capture, but direct capture of carbon dioxide from the air has technological limitations due to high cost and large energy consumption.

[0003] Therefore, the technology to electrochemically capture carbon dioxide from seawater has recently been attracting attention, and a representative example is pH-swing (pH-swing, H during electrochemical reaction). + Wow OH - The technology of controlling the solubility of carbon through the creation of carbon dioxide is being considered as a technology with less burden on marine environment pollution and high potential for demonstration.

[0004] However, existing electrochemical ocean carbon dioxide capture technologies have the following limitations.

[0005] First, due to the problem of high energy consumption, electrochemical ocean carbon dioxide capture technology based on water splitting has a high operating potential (V per unit cell). cellCarbon capture requires high energy consumption because it forms pH swings through water decomposition reactions that require = 3∼6 V / cell.

[0006] Second, due to the lack of a scale-up strategy and low electrode life, if the energy storage principle, i.e., the pH-swing is implemented without using a membrane through a charge / discharge reaction, high-efficiency ocean carbon dioxide capture is possible with low energy consumption, but it is difficult to implement scale-up of pH-swing using the charge / discharge process, and the low electrode life in the charge / discharge reaction makes it difficult to demonstrate the carbon capture process.

[0007] Patent Document 1 relates to an invention for scalable atmospheric carbon dioxide mineralization via seawater electrolysis, comprising a method for capturing carbon dioxide from a gas source using electrochemically enhanced amine capture to form a concentrated carbon dioxide vapor and then sequestering carbon dioxide from the concentrated vapor in a sequestration step, wherein the sequestration step comprises contacting the concentrated vapor with an aqueous sequestration solution comprising ions capable of forming insoluble carbonate salts, whereby the aqueous sequestration solution comprises carbon dioxide, electrochemically basifying the sequestration solution to precipitate carbonate solids, and separating the carbonate solids from the aqueous sequestration solution or a mesh surface.

[0008] The background technology of the above patent document 1 points out the problems of mineralization strategies that depend on complex electrochemical cells (e.g., electrodialysis) and / or slow precipitation dynamics for conventional indirect capture strategies using seawater, and describes the background that was devised to solve the problems, and thus proposes a method through direct air capture of carbon dioxide.

[0009] Patent Document 2 discloses carbon dioxide capturing composite particles in which calcium carbonate particles are formed under conditions where the pH becomes 8 or higher by amine derivatives generated when the polyamidoamine particles are decomposed, by immersing polyamidoamine particles in seawater or an aqueous solution containing dissolved calcium ions and maintaining them at room temperature and pressure to achieve the same purpose of capturing carbon dioxide from seawater, and calcium carbonate particles are adsorbed on the surface of the polyamidoamine particles, and reports that a large amount of aragonite can be produced through mineralization in seawater or an aqueous solution containing dissolved calcium ions, and at the same time, a carbon dioxide reduction effect can be achieved, without requiring a separate device or process conditions such as high temperature and high pressure.

[0010] Patent Document 3 relates to a carbon dioxide fixation system in seawater and a method for producing carbonate minerals using a bipolar membrane electrodialysis device, and discloses a technology comprising a bipolar membrane electrodialysis device that generates acidified seawater and alkaline seawater from seawater, a carbon dioxide separation unit that separates gaseous carbon dioxide from acidified seawater introduced from the bipolar membrane electrodialysis device, and a sedimentation tank into which alkaline seawater is introduced from the bipolar membrane electrodialysis device and gaseous carbon dioxide is introduced from the carbon dioxide separation unit, and wherein carbonate minerals are recovered from the sedimentation tank.

[0011] Accordingly, the present invention has been made in an effort to find an energy-efficient method for capturing carbon dioxide in seawater, and as a result, a carbon dioxide capture module that can be driven at a low potential difference through an oxidation-reduction reaction of a redox substance using a redox-mediated bipolar membrane electrodialysis (RBED) process has been provided, and further, a module that can manufacture and store captured carbon dioxide (CO2) as sodium carbonate (Na2CO3), and secure economic feasibility by stacking inexpensive electrodes instead of stacking membranes during scale-up, and facilitate channel stacking, thereby completing the present invention.

[0012] (Patent Document 1) Republic of Korea Patent Publication No. 2024-0063857 (published on May 10, 2024)

[0013] (Patent Document 2) Republic of Korea Patent Publication No. 2024-0065887 (published on May 14, 2024)

[0014] (Patent Document 3) Japanese Patent Publication No. 2024-062549 (published on May 10, 2024)

[0015] The purpose of the present invention is to provide a multi-channel membrane module system using a redox-based bipolar electrodialysis process capable of capturing carbon dioxide and producing carbonate minerals by combining a redox-based electrodialysis process and a bipolar membrane to induce a pH swing at a low voltage.

[0016] Another object of the present invention is to change pH energy efficiently at low voltage, thereby producing hydrogen ions (H + ) captures carbon dioxide and generates basic ions (OH - ) to provide a module for manufacturing sodium carbonate through generation, and to provide an economical system that is easy to stack channels through an electrode stacking strategy during scale-up.

[0017] In order to achieve the above object, the present invention is a multi-channel membrane module system comprising: a positive electrode; a redox reaction channel disposed adjacent to the positive electrode and driven by an electrochemical reaction of a redox material; and at least one bipolar membrane disposed between the redox reaction channels, and at least one ion exchange membrane selected from the group consisting of a cation exchange membrane and an anion exchange membrane, wherein the membranes are spaced apart from each other and are separated into at least one inflow channel and a capture channel, and when a voltage is applied, hydrogen ions (H) separated by water decomposition in the bipolar membrane are generated. + ) and basic ions (OH - ) provides a multi-channel membrane module system for capturing carbon dioxide from seawater using redox-based bipolar electrodialysis, comprising a carbon dioxide capture channel in which seawater introduced into the inflow channel is captured as carbon dioxide under acidic conditions and a capture channel in which seawater is crystallized as carbonate minerals under basic conditions.

[0018] As a preferred first embodiment, a multi-channel membrane module system is provided in which cation exchange membranes are respectively arranged so as to be in contact with both inner sides of a redox reaction channel arranged adjacent to both electrodes, and anion exchange membranes and bipolar membranes are sequentially arranged apart from a cation exchange membrane arranged on the cathode side, thereby separating sections.

[0019] As a second preferred embodiment, a multi-channel membrane module system is provided in which bipolar membranes are respectively arranged so as to be in contact with both inner sides of a redox reaction channel arranged adjacent to both electrodes, and a cation exchange membrane and an anion exchange membrane are sequentially spaced apart from the bipolar membrane arranged on the cathode side.

[0020] As a preferred third embodiment, a multi-channel membrane module system is provided in which cation exchange membranes are respectively arranged so as to be in contact with the inner sides of redox reaction channels arranged adjacent to both electrodes, and a bipolar membrane is spaced apart between the cation exchange membranes on both sides.

[0021] A separate storage unit may be provided from the carbon dioxide capture channel described above, and carbon dioxide captured from the carbon dioxide capture channel or stored carbon dioxide may be introduced into the crystallization channel to accelerate carbonate mineralization.

[0022] The above cation exchange membrane is preferably a monovalent selective cation exchange membrane, and prevents scaling caused by secondary cations flowing into the electrode.

[0023] The operating voltage of the multi-channel membrane module system using the redox-based bipolar electrodialysis process of the present invention is 0.5 to 1.35 V, which is excellent in terms of energy efficiency as it is performed at a relatively low voltage.

[0024] Furthermore, in the multi-channel membrane module system of the present invention, the redox reaction channel is provided as a stacked module in which multiple layers of porous carbon electrodes are laminated between each electrode, which is useful for scale-up.

[0025] By directly capturing carbon dioxide in seawater through a multi-channel membrane module system for capturing carbon dioxide in seawater using a redox-based bipolar electrodialysis process of the present invention, the carbon dioxide capture capacity of the ocean can be increased, and the captured carbon dioxide can be used as an ultimate carbon dioxide capture and resource recovery system by adding high value through high-purity mineralization.

[0026] The multi-channel membrane module system using the redox-based bipolar electrodialysis process of the present invention can be operated at a low voltage, unlike the existing electrochemical pH-swing system using a high voltage, by utilizing a redox material, and can maximize convenience and secure economic feasibility through scale-up using the electrode stacking method.

[0027] Figure 1 is a schematic diagram of a first embodiment of a multi-channel membrane module system for carbon dioxide capture and Na2CO3 crystallization using redox-based bipolar electrodialysis of the present invention.

[0028] Figure 2 is a voltage measurement result under constant current conditions of the multi-channel membrane module system of Figure 1.

[0029] Figure 3 is a result of the change in electrical conductivity of channel 2 in the multi-channel membrane module system of Figure 1.

[0030] Figure 4 is a result of the change in concentration of each ion according to the use of a single-selective cation exchange membrane in the multi-channel membrane module system of Figure 1.

[0031] Figure 5 is the result of pH change in channel 3 and channel 4 in the multi-channel membrane module system of Figure 1.

[0032] Figure 6 is the carbon dioxide capture rate result in channel 3 in the multi-channel membrane module system of Figure 1.

[0033] Figure 7 is the mineral carbonation yield result in channel 4 in the multi-channel membrane module system of Figure 1.

[0034] Figure 8 is a schematic diagram of a second embodiment of a multi-channel membrane module system for carbon dioxide capture and Na2CO3 crystallization using redox-based bipolar electrodialysis of the present invention.

[0035] Figure 9 is a schematic diagram of a third embodiment of a multi-channel membrane module system for carbon dioxide capture and Na2CO3 crystallization using redox-based bipolar electrodialysis of the present invention.

[0036] Figure 10 is a schematic diagram of the electrode stacking method of a stacked module of a multi-channel membrane for carbon dioxide capture and Na2CO3 crystallization using redox-based bipolar electrodialysis of the present invention.

[0037] Fig. 11 is a voltage change result according to the electrode stacking method of the stacked module of the multi-channel film of Fig. 10.

[0038] Fig. 12 is a result of measuring energy consumption according to the electrode stacking method of the stacked module of the multi-channel film of Fig. 10.

[0039] Hereinafter, the present invention will be described in detail.

[0040] The present invention is a multi-channel membrane module system comprising: a positive electrode; a redox reaction channel disposed adjacent to the positive electrode and driven by an electrochemical reaction of a redox material; and at least one bipolar membrane disposed between the redox reaction channels, and at least one ion exchange membrane selected from the group consisting of a cation exchange membrane and an anion exchange membrane, wherein the membranes are spaced apart from each other and are separated into at least one inflow channel and a capture channel, and when a voltage is applied, hydrogen ions (H) separated by water decomposition in the bipolar membrane are generated. + ) and basic ions (OH - ) provides a multi-channel membrane module system for capturing carbon dioxide from seawater using redox-based bipolar electrodialysis, comprising a carbon dioxide capture channel in which seawater introduced into the inflow channel is captured as carbon dioxide under acidic conditions and a capture channel in which seawater is crystallized as carbonate minerals under basic conditions.

[0041] The multi-channel membrane module system of the present invention is implemented through a redox-mediated bipolar membrane electrodialysis (RBED) process that combines a bipolar electrodialysis process (Bipolar membrane electrodialysis, BPED) with a redox flow desalination process, and its main components are composed of a multi-channel, an ion exchange membrane, and a bipolar membrane.

[0042] The above bipolar electrodialysis (BPED) process is a desalination electrodialysis process consisting of a positive / negative ion exchange membrane that decomposes water to produce hydrogen ions (H + ) and basic ions (OH -) is a process that introduces a bipolar membrane (BM) that can produce H . The bipolar membrane is a new type of membrane that combines positive / negative ion exchange membranes and promotes water decomposition reaction by catalytic reaction under an electric field. + Wow OH - It has the function of generating .

[0043] At this time, the bipolar membrane used in the present invention can be a commercially available or known membrane, and is generally manufactured by bonding polymer cation / anion membranes, and the gap between the cation / anion exchange membranes (transition layer) where water decomposition occurs is about 4 to 5 nm.

[0044] The redox-based bipolar electrodialysis process (RBED) of the present invention is a water splitting reaction (minimum operating potential, V) performed on the electrode surface in a conventional bipolar membrane electrodialysis process (BPED). cell = 1.23 V), the oxidation / reduction reaction of the redox substance on the electrode surface (maximum operating potential, V cell = 1.23 V) enables continuous separation and removal of dissolved ions.

[0045] Therefore, the present invention utilizes a redox reaction and an ion separation membrane, which consumes less energy, has a very fast ion separation speed, and generates hydrogen ions (H) generated from water decomposition in a bipolar membrane. + ) and basic ions (OH - ) can be used to capture carbon dioxide in seawater and recover resources through carbonate mineralization.

[0046] In the multi-channel membrane module system using the above redox-based bipolar electrodialysis, the redox material can be used without any special restrictions as long as it is a material in which a redox reaction occurs reversibly using the same redox pair, and as an example, I3 - / I - , [Fe(CN)6] 3- / [Fe(CN)6] 4- , Zn 2+ / Zn, MVCl2 / MV, etc. can be utilized. In the embodiment of the present invention, Na4Fe(CN)6 is used as a preferred example, but is not limited thereto.

[0047] The above Na4Fe(CN)6 redox substance undergoes a reversible redox reaction as shown in the following reaction scheme 1.

[0048] Reaction Scheme 1

[0049] Fe(CN)6 3- + e- ↔ Fe(CN)6 4-

[0050] The redox reactants of the above redox couple accelerate ion separation while reacting at the electrode.

[0051] In addition, the separated cations and anions can selectively pass through a cation exchange membrane, and the anions can selectively pass through an anion exchange membrane.

[0052] The above cation exchange membrane and anion exchange membrane are microporous insulating separators and may be ion exchange (conductive) membranes. The cation exchange membrane and the anion exchange membrane are installed for electrophysical separation, and the microporous insulating separator can only allow ion movement, while the ion exchange (conductive) membrane can selectively move only cations or anions.

[0053] The ion exchange membrane and electrode used in the present invention may be any of those that have been used in conventional batteries, accumulators, etc., and a general expert in the relevant technical field can select and use them appropriately according to the purpose and conditions of use.

[0054] Carbon dioxide in the atmosphere dissolves into carbonic acid (H2CO3) at the surface of seawater, as shown in the following reaction scheme 1, and carbonic acid is converted into bicarbonate ion (HCO3 - ) and carbonate ions (CO32- ) is ionized.

[0055] Reaction Scheme 1

[0056] CO2(g) + H2O(l) ↔ H2CO3(aq) ↔ HCO3 - (aq) + H + (aq) ↔ CO3 2- (aq) + 2H + (aq)

[0057] The average pH of seawater is about 8, but when the pH drops below 4, the bicarbonate ions and carbonate ions react in reverse and form H + It reacts with and is converted into carbon dioxide.

[0058] Accordingly, the multi-channel membrane module system using redox-based bipolar electrodialysis of the present invention is designed to directly capture carbon dioxide in seawater flowing into an influent channel by controlling the pH within the channel through a pH-swing process using hydrogen ions and alkaline ions separated by water decomposition in a bipolar membrane, and at the same time, crystallize it into carbonate minerals.

[0059] FIG. 1 is a schematic diagram of a first embodiment of a multi-channel membrane module system for carbon dioxide capture and Na2CO3 crystallization using redox-based bipolar electrodialysis of the present invention, in which cation exchange membranes are respectively arranged so as to be in contact with both inner sides of redox reaction channels arranged adjacent to both electrodes, and anion exchange membranes and bipolar membranes are sequentially spaced apart from the cation exchange membrane arranged on the cathode side and separated into sections, thereby providing two redox reaction channels, one influent channel, one carbon dioxide capture channel, and one Na2CO3 crystallization channel.

[0060] In the multi-channel membrane module system for carbon dioxide capture and Na2CO3 crystallization using redox-based bipolar electrodialysis of Fig. 1, channels 1 and 5 are redox channels, which play a role in lowering the cell voltage and increasing the efficiency of the system through the oxidation-reduction reaction of the redox couple.

[0061] Fig. 2 is a voltage measurement result under constant current conditions of a multi-channel membrane module system of the first embodiment (Fig. 1). From the result that the voltage flows constantly at about 1.35 V under a constant current condition of 2.5 mA / ㎠, it can be confirmed that the system operates smoothly at a low voltage of about 1.35 V.

[0062] The operating voltage of the multi-channel membrane module system for capturing carbon dioxide from seawater using redox-based bipolar electrodialysis of the present invention is 0.5 to 1.35 V, which is excellent in terms of energy efficiency as it is performed at a relatively low voltage.

[0063] Also, seawater flows into channel 2 of Fig. 1, and Cl in the seawater - is in the positive direction, Na + moves toward the cathode, and at this time, Mg is selectively used by using monovalent and divalent cation exchange membranes. 2+ and Ca 2+ It prevents the formation of scale on the electrode by controlling the passage of the redox channel.

[0064] Figure 3 shows the results of changes in electrical conductivity in channel 2 of the multi-channel membrane module system of Figure 1, confirming that electrical conductivity decreases as NaCl in seawater is removed. Therefore, it can be confirmed that desalination is possible in channel 2.

[0065] In addition, Fig. 4 shows the results of the concentration change for each ion according to the use of a monovalent selective cation exchange membrane in the multi-channel membrane module system of Fig. 1, and by using a monovalent selective cation exchange membrane on both sides of the redox channel, Na present in channel 2 + , Ca 2+ , Mg 2+ Among the ions, Na + Only selectively concentrated in channel 4, i.e. Ca 2+ , Mg 2+ Multivalent ions such as these are controlled and prevent scale formation that may occur in channel 4 (under alkaline conditions).

[0066] Figure 5 shows the results of pH changes in channels 3 and 4 in the multi-channel membrane module system of Figure 1, with the bipolar membrane operating well and H in channels 3 and 4, respectively. + and OH - The pH change due to the generation can be observed. At this time, in channel 3, HCO3 of seawater - As the solution acts as a buffer, the pH gradually decreases, so the pH does not change rapidly.

[0067] In channel 3 of Figure 1, H is generated through the inflowing seawater and the bipolar membrane. + The environment becomes acidic, and the HCO3 of the seawater that flows in - and CO3 2- Ions are captured as carbon dioxide gas.

[0068] Additionally, to supplement the low concentration of negative ions passing through channel 2, seawater may also flow into channel 3 to accelerate the carbon dioxide capture channel reaction.

[0069] Figure 6 is a result of the carbon dioxide capture rate in channel 3 of the multi-channel membrane module system of Figure 1, and H in channel 3 + As it occurs, HCO3 in seawater - By reacting with CO2(g), it is converted to CO2(g), and the result of the increase in capture rate over time can be confirmed.

[0070] Also, in channel 4 of Fig. 1, OH is transmitted through the bipolar membrane. - is generated and Na is released through the redox channel. + is recovered and NaOH is concentrated. The captured CO2 is injected into channel 4 where the NaOH is concentrated to produce Na2CO3.

[0071] Fig. 7 shows the mineral carbonation yield in channel 4 in the multi-channel membrane module system of Fig. 1, and it can be confirmed that about 0.2 g of Na2CO3 is produced.

[0072] That is, carbon dioxide captured in channel 3 is introduced into channel 4 to induce a reaction with concentrated NaOH. Carbon dioxide is easily dissolved when the pH is basic, and Na + and CO3 2- The reaction produces Na2CO3. Therefore, carbon dioxide in seawater can be captured through pH-swing in a multi-channel membrane module system using redox-based bipolar electrodialysis, and the captured carbon dioxide can be mineralized into sodium carbonate and used as a resource.

[0073] Figure 8 is a schematic diagram of a second embodiment of a multi-channel membrane module system for carbon dioxide capture and Na2CO3 crystallization using redox-based bipolar electrodialysis of the present invention.

[0074] A bipolar membrane is arranged so as to be in contact with both inner sides of a redox reaction channel arranged adjacent to both electrodes, and a cation exchange membrane and an anion exchange membrane are sequentially spaced apart from the bipolar membrane arranged on the cathode side and separated into sections, thereby forming two redox reaction channels, one influent channel, one carbon dioxide capture channel, and one Na2CO3 crystallization channel. At this time, the mechanism of the system is the same as the multi-channel membrane module system using the redox-based bipolar electrodialysis of the first embodiment.

[0075] FIG. 9 is a schematic diagram of a third embodiment of a multi-channel membrane module system for carbon dioxide capture and Na2CO3 crystallization using redox-based bipolar electrodialysis of the present invention, wherein the multi-channel membrane module system is configured such that cation exchange membranes are respectively arranged to contact the inner sides of redox reaction channels arranged adjacent to both electrodes, and bipolar membranes are arranged spaced apart between the cation exchange membranes on both sides to separate the sections, thereby providing a multi-channel membrane module system using redox-based bipolar electrodialysis capable of carbon dioxide capture and Na2CO3 concentration, which has a structure in which one channel is omitted from the first embodiment.

[0076] In the multi-channel membrane module system for carbon dioxide capture and Na2CO3 crystallization using redox-based bipolar electrodialysis of the present invention, a separate storage unit may be provided from the carbon dioxide capture channel, and carbon dioxide may be continuously introduced into the crystallization channel from the carbon dioxide capture channel or stored in the storage unit and then introduced later, and carbonate mineralization may be accelerated by the above method. The obtained carbonate mineral is sodium carbonate (Na2CO3).

[0077] Furthermore, in the multi-channel membrane module system using the redox-based bipolar electrodialysis of the present invention, a stacked module system is provided in which porous carbon electrodes are laminated in multiple layers between the redox reaction channels arranged with each electrode.

[0078] Figure 10 is a schematic diagram of the electrode stacking method of a stacked module of a multi-channel membrane for carbon dioxide capture and Na2CO3 crystallization using redox-based bipolar electrodialysis of the present invention.

[0079] The above redox reaction channel is advantageous for scale-up for commercialization because it reduces the use of expensive bipolar and ion exchange membranes through a stacked module in which electrodes are laminated in multiple layers between each electrode, and increases the processing capacity by laminating inexpensive porous carbon electrodes of the redox reaction channel.

[0080] Fig. 11 shows the voltage change results according to the electrode stacking method of the stacked module of the multi-channel membrane of the present invention. It was confirmed that the voltage was lowered as the carbon electrodes were stacked in 1, 2, and 3 stacks. That is, as the number of carbon electrodes stacked increased, the system resistance decreased, resulting in a lower cell voltage being maintained at the same current density of 2.5 mA / cm2. For reference, the dotted line graph in Fig. 11 is the result of a comparative experiment using a Pt electrode (1 stack) that is mainly used in the past.

[0081] Fig. 12 shows the results of measuring energy consumption according to the electrode stacking method of the stacked module of the multi-channel membrane of Fig. 10. It can be confirmed that energy consumption is reduced by stacking carbon electrodes. In particular, compared to the expensive Pt catalyst electrode used in the past, an energy consumption reduction of approximately 40% can be confirmed.

[0082] Therefore, through the electrode stacking method of the stacked module of the above multi-channel membrane, an economical and convenient system for stacking can be built through the electrode stacking method strategy during scale-up, and by stacking inexpensive carbon electrodes instead of expensive catalyst electrodes, energy consumption can be reduced and price competitiveness can be secured.

[0083] That is, the multi-channel membrane module system using redox-based bipolar electrodialysis of the present invention utilizes porous carbon electrodes that are highly price competitive compared to electrodialysis processes that utilize expensive metal and metal oxide electrodes in the past due to mild electrochemical reaction conditions of redox substances, thereby minimizing the use of ion exchange membranes through scale-up through electrode stacking in process design, thereby reducing process capital costs and operating costs.

[0084] Although the present invention has been described in detail above only with respect to the described specific examples, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical scope of the present invention, and it is natural that such modifications and variations fall within the scope of the appended claims.

Claims

positive electrode; A redox reaction channel disposed adjacent to the above two electrodes and driven by an electrochemical reaction of a redox material; and A multi-channel membrane module system is disposed between the redox reaction channels, and includes at least one bipolar membrane and at least one ion exchange membrane selected from the group consisting of a cation exchange membrane and an anion exchange membrane, wherein the membranes are spaced apart from each other and are separated into at least one influent channel and a capture channel. When voltage is applied, hydrogen ions (H) are separated from the bipolar membrane by water decomposition. + ) and basic ions (OH - ) is a multi-channel membrane module system for capturing carbon dioxide in seawater using redox-based bipolar electrodialysis, comprising a carbon dioxide capture channel in which seawater introduced into the inflow channel is captured as carbon dioxide under acidic conditions and a capture channel in which seawater is crystallized into carbonate minerals under basic conditions. In the first paragraph, the multi-channel membrane module system A multi-channel membrane module system for capturing carbon dioxide from seawater using redox-based bipolar electrodialysis, characterized in that cation exchange membranes are respectively arranged so as to be in contact with the inner sides of redox reaction channels arranged adjacent to positive electrodes, and anion exchange membranes and bipolar membranes are sequentially spaced apart from the cation exchange membrane arranged on the cathode side and separated into sections. In the first paragraph, the multi-channel membrane module system A multi-channel membrane module system for capturing carbon dioxide from seawater using redox-based bipolar electrodialysis, characterized in that bipolar membranes are respectively arranged so as to be in contact with the inner sides of redox reaction channels arranged adjacent to positive electrodes, and cation exchange membranes and anion exchange membranes are sequentially spaced apart from the bipolar membrane arranged on the cathode side and separated into sections. In the first paragraph, the multi-channel membrane module system A multi-channel membrane module system for capturing carbon dioxide from seawater using redox-based bipolar electrodialysis, characterized in that cation exchange membranes are respectively arranged so as to be in contact with the inner sides of redox reaction channels arranged adjacent to positive electrodes, and bipolar membranes are arranged spaced apart between the cation exchange membranes on both sides to separate the sections. A multi-channel membrane module system for capturing carbon dioxide from seawater using redox-based bipolar electrodialysis, characterized in that it has a separate storage unit from the carbon dioxide capture channel in the first paragraph. A multi-channel membrane module system for capturing carbon dioxide from seawater using redox-based bipolar electrodialysis, characterized in that carbon dioxide is continuously introduced into the crystallization channel from the carbon dioxide capture channel in the first paragraph or carbon dioxide stored from the carbon dioxide capture channel is subsequently introduced. A multi-channel membrane module system for capturing carbon dioxide from seawater using redox-based bipolar electrodialysis, characterized in that the cation exchange membrane in claim 1 is a monovalent selective cation exchange membrane. A multi-channel membrane module system for capturing carbon dioxide from seawater using redox-based bipolar electrodialysis, characterized in that the voltage in claim 1 is 0.5 to 1.35 V. A multi-channel membrane module system for capturing carbon dioxide from seawater using redox-based bipolar electrodialysis, characterized in that the redox reaction channel in the first paragraph is a stacked module in which porous carbon electrodes are laminated in multiple layers between each electrode.

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