Carbon dioxide absorption module, carbon dioxide absorption tower, carbon dioxide absorption device and carbon dioxide absorption method

Abstract

One embodiment of the present disclosure includes a carbon dioxide absorption module comprising a carbon dioxide absorption material, a solution covering the carbon dioxide absorption material, and a supply section for supplying carbon dioxide to the solution.

Description

Technical Field

[0001] This disclosure relates to carbon dioxide absorption modules, carbon dioxide absorption towers, carbon dioxide absorption devices, and carbon dioxide absorption methods. Background Technology

[0002] In order to recover carbon dioxide in industrial equipment, living spaces, etc., the application of materials that can absorb carbon dioxide (hereinafter also referred to as "carbon dioxide absorbing materials") has been studied (see Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2017-109198 Summary of the Invention

[0006] One embodiment of the present disclosure includes a carbon dioxide absorption module comprising a carbon dioxide absorption material, a solution covering the carbon dioxide absorption material, and a supply section for supplying carbon dioxide to the solution. Attached Figure Description

[0007] Figure 1 This is a schematic perspective view of a carbon dioxide absorption module and a carbon dioxide absorption device having the carbon dioxide absorption module according to one embodiment of the present disclosure.

[0008] Figure 2 yes Figure 1 A schematic sectional view of a carbon dioxide absorption device along line II-II.

[0009] Figure 3 It means Figure 1 A schematic cross-sectional view of a modified example of the support in a carbon dioxide absorption module.

[0010] Figure 4 It means Figure 1 The support body in the carbon dioxide absorption module and Figure 3 Schematic cross-sectional views of different variations.

[0011] Figure 5 This indicates that it is consistent with this disclosure. Figure 1 Schematic diagrams of carbon dioxide absorption modules involved in different methods and carbon dioxide absorption towers equipped with such carbon dioxide absorption modules.

[0012] Figure 6 This is a flowchart illustrating a carbon dioxide absorption method according to one embodiment of the present disclosure. Detailed Implementation

[0013] [The problem this disclosure aims to solve]

[0014] Patent Document 1 describes a carbon dioxide absorbing material that absorbs carbon dioxide from a gas containing water and carbon dioxide. Patent Document 1 describes absorbing carbon dioxide by placing a gas containing water and carbon dioxide and the carbon dioxide absorbing material in a sealed container. However, if the technology described in Patent Document 1 is used, it is difficult to achieve sufficient carbon dioxide absorption due to insufficient water content, etc.

[0015] This disclosure is made based on the above circumstances, and its purpose is to provide a carbon dioxide absorption module with excellent carbon dioxide absorption efficiency.

[0016] [The Effects of This Disclosure]

[0017] The carbon dioxide absorption module involved in one aspect of this disclosure has excellent carbon dioxide absorption efficiency.

[0018] [Description of embodiments of this disclosure]

[0019] The embodiments of this disclosure are first described by listing them.

[0020] (1) A carbon dioxide absorption module according to one aspect of the present disclosure comprises: a carbon dioxide absorption material; a solution covering the carbon dioxide absorption material; and a supply unit supplying carbon dioxide to the solution.

[0021] This carbon dioxide absorption module can cover the carbon dioxide absorption material with the solution containing dissolved carbon dioxide. At this time, a portion of the dissolved carbon dioxide is converted into carbonate ions. Therefore, the carbon dioxide absorption material can easily absorb the carbonate ions dissolved in the solution. Thus, this carbon dioxide absorption module exhibits excellent carbon dioxide absorption efficiency.

[0022] (2) In (1) above, the carbon dioxide absorption material can be a layered double hydroxide, an alkaline metal oxide, or an alkaline metal hydroxide. By making the carbon dioxide absorption material a layered double hydroxide, an alkaline metal oxide, or an alkaline metal hydroxide, it is easier to absorb carbonate ions in the solution.

[0023] (3) In (1) or (2) above, a dissolution-promoting mechanism can be provided to facilitate the dissolution of carbon dioxide into the solution. By providing such a dissolution-promoting mechanism, the amount of carbonate ions in the solution can be easily increased. Therefore, the absorption efficiency of carbon dioxide can be further improved.

[0024] (4) In any of (1) to (3) above, the solution may contain a dissolution promoter that promotes the dissolution of the carbon dioxide into the solution. By including a dissolution promoter in the solution in this way, it is easy to increase the amount of carbon dioxide in the solution. Therefore, the carbon dioxide absorption efficiency can be further improved.

[0025] (5) In any of (1) to (4) above, the dissolution rate of the carbon dioxide in the solution can be lower than the carbonation rate of the carbon dioxide absorbent material. By making the dissolution rate of the carbon dioxide in the solution lower than the carbonation rate of the carbon dioxide absorbent material, the carbon dioxide supplied from the supply unit can be absorbed more reliably by the carbon dioxide absorbent material.

[0026] (6) In any of (1) to (5) above, a plurality of the aforementioned carbon dioxide absorbent materials may be included, wherein the average particle size of the plurality of carbon dioxide absorbent materials is 5 nm or more and 500 nm or less. By making the average particle size of the plurality of carbon dioxide absorbent materials at or above the lower limit, the contact area between the carbon dioxide absorbent materials and the solution can be increased. In addition, by making the average particle size at or below the upper limit, carbonate ions can easily penetrate into the interior of the crystals of the carbon dioxide absorbent materials. Therefore, the carbon dioxide absorption efficiency can be further improved.

[0027] (7) In (6) above, a dispersion mechanism may be provided to disperse the plurality of carbon dioxide absorbent materials in the solution, wherein the dispersion mechanism maintains the average particle size of the plurality of carbon dioxide absorbent materials at 5 nm or more and 500 nm or less. By providing such a dispersion mechanism to disperse the plurality of carbon dioxide absorbent materials in the solution, the agglomeration of the carbon dioxide absorbent materials can be suppressed, and the appropriate particle size of the carbon dioxide absorbent materials can be easily maintained.

[0028] (8) In any of (1) to (7) above, the pH of the solution can be greater than 6. By making the pH of the solution greater than the lower limit, the chemical equilibrium in the solution is easily shifted by increasing the ratio of carbonate ions. Therefore, the absorption efficiency of carbon dioxide can be further improved.

[0029] (9) In any of (1) to (8) above, the solution may contain a pH buffer. By including a pH buffer in the solution, it is easy to maintain an increased ratio of carbonate ions in the solution. Therefore, it is easy to maintain the carbon dioxide absorption efficiency.

[0030] (10) In any of (1) to (9) above, a solution adjustment mechanism for supplying an alkaline substance to the solution can be provided. By providing such a solution adjustment mechanism, it is easy to maintain a state in which the ratio of carbonate ions in the solution is increased. Therefore, it is easy to maintain the carbon dioxide absorption efficiency.

[0031] (11) In any of (1) to (10) above, a display mechanism can be provided to show the decrease in activity of the carbon dioxide absorption material when the activity decreases. By providing such a display mechanism to show the decrease in activity of the carbon dioxide absorption material, the environment of the solution can be easily controlled to maintain the carbon dioxide absorption efficiency.

[0032] (12) In any of (1) to (11) above, a plurality of the aforementioned carbon dioxide absorbent materials may be provided, along with a dispensing mechanism for distributing the solution to the plurality of carbon dioxide absorbent materials. By providing such a dispensing mechanism for distributing the solution to the plurality of carbon dioxide absorbent materials, the solution can be made to contact the plurality of carbon dioxide absorbent materials uniformly. As a result, the carbon dioxide absorption efficiency can be easily improved.

[0033] (13) In (12) above, a container for accommodating the plurality of carbon dioxide absorbent materials may be provided. By providing such a container for accommodating the plurality of carbon dioxide absorbent materials, the solution can be supplied in a manner that allows for uniform contact with the plurality of carbon dioxide absorbent materials located at a predetermined position.

[0034] (14) In any of (1) to (13) above, a porous support body provided with the carbon dioxide absorption material can be provided. By providing such a porous support body provided with the carbon dioxide absorption material, the carbon dioxide absorption material can be easily and stably maintained.

[0035] (15) In (14) above, the support may be a porous particle, and the average particle size of the porous particle in which the carbon dioxide absorbent material is disposed may be 10 mm or less. By making the average particle size of the porous particle below the upper limit, the overall homogenization of the system is achieved, thereby easily improving the absorption efficiency of the carbon dioxide absorbent material for carbonate ions. Furthermore, from the viewpoint of easily disposing the carbon dioxide absorbent material in the porous particle, the lower limit of the average particle size of the porous particle may be 1.0 × 10⁻⁶ mm. -5 mm.

[0036] (16) In (14) above, the support body may also be a porous filament or a porous sheet, and a plurality of the carbon dioxide absorption materials may be disposed on the support body. By making the support body a porous filament or a porous sheet and disposing of the plurality of carbon dioxide absorption materials on the support body, carbonate ions can be easily and reliably contacted with the plurality of carbon dioxide absorption materials.

[0037] (17) In any of (14) to (16) above, a plurality of the above-mentioned supports may be provided, and the plurality of supports are arranged at intervals between each other. By arranging the plurality of supports at intervals between each other in this way, it is possible to easily and stably maintain the state in which the plurality of carbon dioxide absorbent materials are in easy contact with carbonate ions.

[0038] (18) The carbon dioxide absorption tower involved in another aspect of this disclosure has a carbon dioxide absorption module as described in any one of (1) to (17) above.

[0039] This carbon dioxide absorption tower is equipped with this carbon dioxide absorption module, thus its carbon dioxide absorption efficiency is excellent.

[0040] (19) Another aspect of the present invention relates to a carbon dioxide absorption device comprising a carbon dioxide absorption module as described in any one of (1) to (17) above and a storage tank for storing the solution, wherein the carbon dioxide absorption material is immersed in the solution.

[0041] The carbon dioxide absorption device includes the carbon dioxide absorption module, and the carbon dioxide absorption material is immersed in the solution, thus achieving excellent carbon dioxide absorption efficiency.

[0042] (20) Another aspect of the present disclosure relates to a carbon dioxide absorption method comprising a step of contacting carbonate ions with a carbon dioxide absorption material covered by a solution.

[0043] In this carbon dioxide absorption method, the solution covers the carbon dioxide absorbing material, thereby promoting the carbonation of the carbon dioxide absorbing material. Therefore, this carbon dioxide absorption method exhibits excellent carbon dioxide absorption efficiency.

[0044] In this disclosure, "the solution covering the carbon dioxide absorbent material" is sufficient as long as the carbon dioxide absorbent material is covered by the solution, and is not limited to a configuration where the carbon dioxide absorbent material is always covered by the solution. Furthermore, it is sufficient as long as the carbon dioxide absorbent material is partially covered by the solution, and is not limited to a configuration where the entire carbon dioxide absorbent material is covered by the solution. Further, the carbon dioxide absorbent material can be in contact with a component such as a cloth used for transferring the solution, or it can be configured to be covered by the solution transferred through that component. The form of carbon dioxide supplied by the "supply unit" is not limited to gas, and can also be in a dissolved state. That is, the supply unit can supply carbon dioxide in, for example, the form of carbonate ions. "Particle size" refers to the particle size in secondary particles. However, in the case where secondary particles are not formed, it refers to the particle size of primary particles. "Average particle size" refers to the median particle size (D50) calculated according to JIS-Z-8819-2:2001, where the cumulative distribution based on volume is 50%.

[0045] [Details of the embodiments of this disclosure]

[0046] Hereinafter, embodiments of the present disclosure will be described in detail with appropriate reference to the accompanying drawings.

[0047] [First Implementation Method]

[0048] Figure 1 as well as Figure 2 The carbon dioxide absorption module 101 includes a carbon dioxide absorption material 10, a solution 20 covering the carbon dioxide absorption material 10, and a supply section 30 for supplying carbon dioxide to the solution 20. Figure 1 as well as Figure 2 As shown, the carbon dioxide absorption module 101 is configured in the carbon dioxide absorption device 1.

[0049] The carbon dioxide absorption module 101 can cover the carbon dioxide absorption material 10 with a solution 20 containing dissolved carbon dioxide. At this time, a portion of the dissolved carbon dioxide is converted into carbonate ions. Therefore, the carbon dioxide absorption material 10 can easily absorb the carbonate ions dissolved in the solution 20. Thus, the carbon dioxide absorption module 101 exhibits excellent carbon dioxide absorption efficiency.

[0050] The carbon dioxide absorption module 101 and the carbon dioxide absorption device 1 are used, for example, to absorb or recover carbon dioxide in production equipment, living spaces, offices, etc. The size of the carbon dioxide absorption module 101 and the carbon dioxide absorption device 1 is appropriately set according to the place of use and purpose. Hereinafter, the carbon dioxide absorption module 101 and the carbon dioxide absorption device 1 equipped with the carbon dioxide absorption module 101 will be described in detail.

[0051] <Carbon Dioxide Absorption Module>

[0052] The carbon dioxide absorption module 101 absorbs carbonate ions generated in the solution 20 by covering the carbon dioxide absorption material 10 with a solution 20 containing dissolved carbon dioxide. The carbon dioxide absorption module 101 includes multiple carbon dioxide absorption materials 10. Furthermore, the carbon dioxide absorption module 101 includes: a dissolution promoting mechanism 40 for promoting the dissolution of carbon dioxide into the solution 20; a dispersion mechanism 50 for dispersing the multiple carbon dioxide absorption materials 10 in the solution 20; a solution adjustment mechanism 60 for supplying an alkaline substance to the solution 20; a display mechanism 90 for displaying a decrease in the activity of the carbon dioxide absorption materials 10; and a porous support 71a on which the carbon dioxide absorption materials 10 are disposed.

[0053] (Carbon dioxide absorption materials)

[0054] The carbon dioxide absorbent 10 is in granular form, more specifically, in powder form. As the carbon dioxide absorbent 10, a material that does not lose its chemical reactivity with carbon dioxide (more specifically, carbonate ions) when covered by the solution 20 is used. Examples of carbon dioxide absorbent 10 include layered double hydroxides (LDH), basic metal oxides, and basic metal hydroxides. The carbon dioxide absorbent 10 being a layered double hydroxide, a basic metal oxide, or a basic metal hydroxide allows for easier absorption of carbonate ions from the solution 20. In this carbon dioxide absorption module 101, the carbon dioxide absorbent 10 may contain only one of layered double hydroxides, basic metal oxides, and basic metal hydroxides, or it may contain two or more.

[0055] [Layered double hydroxides]

[0056] The aforementioned layered double hydroxide releases carbon dioxide upon heating at a lower temperature after absorbing carbonate ions. Therefore, the reuse efficiency of the carbon dioxide absorption material 10 can be improved based on the aforementioned layered double hydroxide.

[0057] The above-mentioned layered double hydroxide can be a compound represented by the following formula (1).

[0058] [M1 1-x 2+ M2 x 3+ (OH)2] x+ [A x / n n- ·yH2O] x- ···(1)

[0059] In the above formula (1), M1 is a divalent metal, M2 is a trivalent metal, and An- For n-valent anions, x is a number greater than or equal to 0.2 and less than 0.33, and n is an integer greater than or equal to 1. Examples of M1 above include Mg, Mn, Ni, and Zn. Examples of M2 above include Al, Cr, Fe, and Co. Examples of A above... n- OH can be listed - Cl - NO3 - CO3 2- SO4 2- [Fe(CN)6] 3- etc. The above-mentioned layered double hydroxides can be in solution 20 in the basic layer [M1] 1-x 2+ M2 x 3+ (OH)2] x+ Intake of A n- And water. The aforementioned layered double hydroxides can be Mg-Al (M1 is Mg and M2 is Al), Mg-Fe (M1 is Mg and M2 is Fe), Fe-Fe (M1 and M2 are both Fe), or Zn-Al (M1 is Zn and M2 is Al). By setting the aforementioned layered double hydroxides as Mg-Al, Mg-Fe, Fe-Fe, or Zn-Al, carbonate ions (CO3-) can be readily absorbed. 2- As A n- .

[0060] [Alkaline metal oxides]

[0061] Compared to the layered double hydroxides, the aforementioned alkaline metal oxides have a higher ratio of absorbed carbonate ions per mole of metal. Therefore, by using the aforementioned alkaline metal oxides, the absorption efficiency of carbon dioxide can be improved.

[0062] The aforementioned alkaline metal oxides can be compounds represented by the chemical formula MO (where M is a metal). Examples of M include Ca, Mg, and Ba. These alkaline metal oxides can be oxidized in solution 20 to form alkaline metal hydroxides (M(OH)2), which can then react with carbonate ions (CO3-). 2- The reaction transforms the alkali metal oxide into MCO3. That is, the above-mentioned alkali metal oxide is readily carbonated by reacting with carbonate ions in solution 20. Furthermore, the carbonated alkali metal oxide can be reused by heating.

[0063] [Alkaline metal hydroxides]

[0064] As the carbon dioxide absorbent 10, a material initially prepared as an alkaline metal hydroxide can be used. By using the aforementioned alkaline metal hydroxide as the carbon dioxide absorbent 10, the solution 20 is easily kept alkaline. As a result, it is easy to maintain a high ratio of carbonate ions in the solution 20.

[0065] From the viewpoint of increasing the contact area between the carbon dioxide absorber 10 and the solution 20, the lower limit of the average particle size of the multiple carbon dioxide absorber materials 10 can be 5 nm, 10 nm, or 15 nm. On the other hand, from the viewpoint of facilitating the penetration of carbonate ions into the crystal interior of the carbon dioxide absorber material 10, the upper limit of the average particle size can be 500 nm, 200 nm, 100 nm, 50 nm, or 30 nm. Furthermore, the average particle size can be 5 nm or more and 500 nm or less, 10 nm or more and 200 nm or less, 10 nm or more and 100 nm or less, 10 nm or more and 50 nm or less, 10 nm or more and 30 nm or less, or 15 nm or more and 30 nm or less.

[0066] (Support body)

[0067] Multiple carbon dioxide absorbent materials 10 are disposed on the support 71a. The carbon dioxide absorption module 101, by providing the support 71a, can stably hold the carbon dioxide absorbent materials 10. Furthermore, according to this configuration, the carbon dioxide absorbent materials 10 can be easily recovered after absorbing carbon dioxide. Therefore, the carbon dioxide absorbed by this carbon dioxide absorption module 101 can be easily used for other purposes, etc.

[0068] exist Figure 1 as well as Figure 2 In this structure, the support 71a is a porous sheet. That is, Figure 1 as well as Figure 2 In this design, multiple carbon dioxide absorbent materials 10 are disposed on a porous sheet. Because the support 71a is a porous sheet, the carbon dioxide absorbent materials 10 can easily and reliably contact carbonate ions. Furthermore, multiple carbon dioxide absorbent materials 10 are disposed at intervals on a porous sheet. Because the support 71a is a porous sheet, the multiple carbon dioxide absorbent materials 10 can be easily disposed with intervals between them. As a result, the aggregation of the carbon dioxide absorbent materials 10 is easily suppressed, and the absorption effect of the carbon dioxide absorbent materials 10 on carbonate ions is improved.

[0069] Examples of materials that can be used as the support 71a include cloth, non-woven fabric sheets, woven fabric sheets, sponge sheets, cellulose fiber sheets such as Japanese paper, carbon fiber sheets, ceramic fiber sheets such as those made of alumina, and metal fiber sheets such as those made of copper or stainless steel. Furthermore, to prevent deterioration and corrosion caused by the solution 20 described later, the support 71a may also undergo surface treatments such as gold plating or resin coating.

[0070] The carbon dioxide absorbent material 10 can be disposed on the surface of the support 71a or inside the support 71a. Alternatively, the carbon dioxide absorbent material 10 can be carried on the surface or pores of the support 71a, using the support 71a as a carrier.

[0071] The support material described above is not limited to the porous sheet; for example, it can be a porous particle or a porous filament. Hereinafter, refer to... Figure 3 as well as Figure 4 The configuration of the carbon dioxide absorbent material 10 disposed on the aforementioned porous particles or porous filaments will be described. Furthermore, even when disposed on the aforementioned porous particles or porous filaments, the carbon dioxide absorbent material 10 may be disposed on the surface of the supports 71b and 71c, or it may be disposed inside the supports 71b and 71c. Alternatively, the supports 71b and 71c may be used as carriers and supported on their surfaces or in their pores.

[0072] Figure 3 The support 71b is a porous particle. Figure 3 In this process, multiple carbon dioxide absorbent materials 10 are disposed within a porous particle. More specifically, multiple carbon dioxide absorbent materials 10 are disposed at intervals within a porous particle. This arrangement facilitates the suppression of aggregation of the carbon dioxide absorbent materials 10 and enhances their absorption efficiency for carbonate ions.

[0073] Examples of porous particles include silica gel, water-absorbing polymers, activated carbon particles, porous glass, and porous metal particles. Furthermore, to prevent deterioration and corrosion caused by the solution 20 described later, the porous particles can undergo surface treatments such as gold plating or resin coating. From the viewpoint of facilitating the preparation of the carbon dioxide absorbent material 10, the lower limit of the average particle size of the porous particles can be 2 times, 5 times, or 10 times the average particle size of the carbon dioxide absorbent material 10. Additionally, the lower limit of the average particle size of the porous particles can be 1.0 × 10⁻⁶. -5 mm, or 2.5 × 10 -5 mm, or 5.0 × 10 -5mm. From the viewpoint that achieving overall system homogenization easily improves the absorption efficiency of carbon dioxide absorber 10 for carbonate ions, the upper limit of the average particle size of the aforementioned porous particles can be 10 mm. The upper limit of the average particle size of the aforementioned porous particles can be 200 times, 100 times, or 50 times the average particle size of carbon dioxide absorber 10. The average particle size of the aforementioned porous particles can be more than 2 times and less than 200 times the average particle size of carbon dioxide absorber 10, more than 5 times and less than 100 times, or more than 10 times and less than 50 times. The average particle size of the aforementioned porous particles can be 1.0 × 10⁻⁶ mm. -5 For thicknesses between 10 mm and 2.5 mm, 2.5 × 10 mm is also acceptable. -5 For sizes between 10mm and 2mm, 5.0×10 mm is also acceptable. -5 More than 1 mm and less than 10 mm.

[0074] Figure 4 The support 71c is a porous filament. Figure 4 In this design, multiple carbon dioxide absorbent materials 10 are arranged on a single porous filament. The porous filament of the support 71c allows carbonate ions to easily and reliably contact the multiple carbon dioxide absorbent materials 10. Furthermore, multiple carbon dioxide absorbent materials 10 are arranged at intervals on a single porous filament. The porous filament of the support 71c allows for easy and spaced arrangement of the multiple carbon dioxide absorbent materials 10. As a result, the aggregation of the carbon dioxide absorbent materials 10 is easily suppressed, improving the absorption efficiency of the carbon dioxide absorbent materials 10 for carbonate ions.

[0075] As for the aforementioned porous filaments, there are no particular limitations as long as they have multiple pores; for example, hollow fiber membranes with a fibrous skeleton can be used.

[0076] The lower limit of the average pore size of the supports 71a, 71b, and 71c can be a multiple of the average particle size of the carbon dioxide absorbent material 10, such as 3 times, 5 times, or 10 times, from the viewpoint of ensuring air permeability or facilitating the loading of the carbon dioxide absorbent material 10. Furthermore, the upper limit of the average pore size of the supports 71a, 71b, and 71c is not particularly limited; for example, it can be 100 times the average particle size of the carbon dioxide absorbent material 10. Here, the "average pore size" is calculated from the BET specific surface area and pore volume obtained by gas adsorption method according to JIS-Z-8830-2:2013.

[0077] The number of supports in the carbon dioxide absorption module 101 is not particularly limited; there may be one or more supports. When the carbon dioxide absorption module 101 has multiple supports, these supports may be any one of the porous sheets, porous particles, and porous filaments, or a combination of two or more of the porous sheets, porous particles, and porous filaments may be used.

[0078] When the carbon dioxide absorption module 101 has multiple supports as described above, these supports can be arranged spaced apart from each other. With this configuration, multiple carbon dioxide absorption materials 10 can be easily and stably maintained in a state where they can easily come into contact with carbonate ions.

[0079] like Figure 1 as well as Figure 2 As shown, when multiple supports 71a are arranged spaced apart from each other, these supports 71a can also be arranged with spacers 72 between them. Figure 1 as well as Figure 2 In this carbon dioxide absorption module 101, multiple support bodies 71a are alternately arranged with spacers 72 in their thickness direction. More specifically, the multiple support bodies 71a have surfaces in contact with the spacers 72 and are alternately arranged with the spacers 72. The multiple support bodies 71a may also be fixed to the spacers 72. In this carbon dioxide absorption module 101, multiple carbon dioxide absorption materials 10, multiple support bodies 71a, and multiple spacers 72 constitute a carbon dioxide absorption section 70 as a whole.

[0080] The spacer 72 is, for example, plate-shaped. The spacer 72 is alternately arranged with the support 71a in a state where its plate surface contacts the support 71a. The spacer 72 is a porous material. The porous nature of the spacer 72 forms a pathway for carbonate ions to reach the carbon dioxide absorption material 10. Examples of spacers 72 include mesh-like structures and sponges. Furthermore, the spacer 72 is not limited to a plate shape; it can also be a rod-shaped member that only contacts a portion of the support 71a. By incorporating the spacer 72, the carbon dioxide absorption module 101 can easily maintain the spacing between multiple supports 71a and arrange them at a high density.

[0081] (Supply Department)

[0082] The supply unit 30 supplies carbon dioxide-containing gas to the solution 20. More specifically, the supply unit 30 supplies carbon dioxide to the solution 20 by supplying carbon dioxide-containing gas to the storage tank 102, which stores the solution 20 (described later). The supply unit 30 includes, for example, a supply pipe capable of supplying carbon dioxide from the lower part of the storage tank 102 into the storage tank 102.

[0083] (solution)

[0084] The solution 20 always covers the plurality of carbon dioxide absorbent materials 10. In this carbon dioxide absorption module 101, the plurality of carbon dioxide absorbent materials 10 are immersed in the solution 20, and more specifically, the carbon dioxide absorption section 70 is immersed in the solution 20.

[0085] Solution 20 contains water as a solvent. Additionally, solution 20 may contain a dissolution promoter that facilitates the dissolution of carbon dioxide in solution 20, a pH buffer material, or a salt that exhibits alkalinity in solution 20.

[0086] A gas containing carbon dioxide is supplied from the supply section 30 to the solution 20. As a result, a chemical equilibrium is achieved in the solution 20 as shown in equations (2) and (3) below, generating carbonate ions (CO3). 2- Furthermore, in equations (2) and (3) below, aq represents the hydrated state.

[0087] CO2(aq)=H + (aq) + HCO3 - (aq)···(2)

[0088] HCO3 - (aq)=H + (aq)+CO3 2- (aq)···(3)

[0089] The pH of solution 20 can be greater than 6. With this configuration, the chemical equilibrium in solution 20 is easily shifted in a way that increases the ratio of carbonate ions (i.e., the chemical equilibria of equations (2) and (3) above are easily shifted to the right side, respectively). In addition, this easily increases the activity of carbon dioxide absorption material 10. Therefore, the absorption efficiency of carbonate ions can be further improved. From the viewpoint of increasing the amount of carbonate ions generated in solution 20, the lower limit of the pH of solution 20 can be 8 or 10. On the other hand, there is no particular limitation on the upper limit of the pH of solution 20. From the viewpoint of easily controlling the pH of solution 20, it can be set to 13 for example. In addition, the pH of solution 20 can be 6 or more and 13 or less, 8 or more and 13 or less, or 10 or more and 13 or less.

[0090] [Solubility accelerator]

[0091] As a solubilizing agent, carbonic acid dehydrating enzymes can be cited as an example. Carbonic acid dehydrating enzymes promote the dissolution of bicarbonate ions (HCO3-) in formula (2) above. - The formation of carbonate ions is facilitated by including the aforementioned dissolution promoter in solution 20. This increases the amount of carbonate ions in solution 20, thereby further improving the carbon dioxide absorption efficiency.

[0092] [pH buffer]

[0093] The aforementioned pH buffer (buffer solution) inhibits the decrease of pH in solution 20. Examples of such pH buffering materials include ammonium chloride and sodium phosphate. By including a pH buffer in solution 20, it is easy to maintain an increased ratio of carbonate ions in solution 20. Therefore, it is easy to maintain the carbon dioxide absorption efficiency.

[0094] 〔Salt〕

[0095] Examples of salts that exhibit alkalinity in solution 20, i.e., salts that dissolve in solution 20 and exhibit alkalinity, include calcium hydroxide chloride, magnesium hydroxide chloride, and polyferric chloride. Alternatively, the aforementioned alkaline metal hydroxides (M(OH)₂) can also be used as these salts. By including these salts in solution 20, the pH of solution 20 can be easily increased. Consequently, the chemical equilibrium in solution 20 is easily shifted in a manner that increases the ratio of carbonate ions. Furthermore, when the carbon dioxide absorbent material 10 is one of the aforementioned alkaline metal oxides, the activity of the carbon dioxide absorbent material 10 in absorbing carbonate ions is easily maintained.

[0096] (Dissolution facilitator)

[0097] The dissolution-promoting mechanism 40 promotes the dissolution of carbon dioxide into the solution 20 as described above. By incorporating the dissolution-promoting mechanism 40, the carbon dioxide absorption module 101 can easily increase the amount of carbon dioxide in the solution 20. Therefore, the carbon dioxide absorption efficiency can be further improved.

[0098] Examples of dissolution-promoting mechanisms 40 include bubble generating devices (bubbling devices) capable of generating nanobubbles, microbubbles, and other fine bubbles in solution 20; ultrasonic generating devices capable of generating cavitation bubbles in solution 20; and temperature and pressure control devices capable of reducing the water temperature of solution 20 and increasing the partial pressure of carbon dioxide.

[0099] exist Figure 1 as well as Figure 2 In this solution, the dissolution promoting mechanism 40 includes the aforementioned bubble generating device. This bubble generating device is positioned in the flow path of carbon dioxide from the supply unit 30 to the storage tank 102. The bubble generating device atomizes the carbon dioxide-containing gas into fine bubbles and supplies them to the solution 20.

[0100] From the viewpoint of increasing the overall contact area between carbon dioxide and solution 20, the upper limit of the diameter of the aforementioned fine bubbles can be 1.0 μm, 0.8 μm, or 0.6 μm. On the other hand, the lower limit of the diameter of the aforementioned fine bubbles is not particularly limited; for example, it can be set to 0.005 μm. Furthermore, the diameter of the aforementioned fine bubbles can be 0.005 μm or more and 1.0 μm or less, 0.005 μm or more and 0.8 μm or less, or 0.005 μm or more and 0.6 μm or less. In addition, "bubble diameter" refers to the diameter at the moment of ejection from the bubble generating device.

[0101] As the lower limit of the partial pressure of carbon dioxide in the gas supplied from the supply unit 30 to the storage tank 102, from the viewpoint of improving the absorption efficiency of carbon dioxide absorption material 10 for carbonate ions, it can be 4.0 × 10⁻⁶. -5 MPa, which can be 6.0 × 10 -5 MPa, or 8.0 × 10 -5 MPa. On the other hand, there is no particular limit to the upper limit of the aforementioned partial pressure; for example, it can be set to 1.0 × 10 MPa. -1 MPa. Additionally, the partial pressure mentioned above can be 4.0 × 10⁻⁶ MPa. -5 MPa or higher and 1.0×10 -1 Below MPa, it can be 6.0×10 -5 MPa or higher and 1.0×10 -1 Below MPa, it can be 8.0×10 -5 MPa or higher and 1.0×10 -1 Below MPa. Therefore, when the dissolution promoting mechanism 40 is the temperature and pressure control device described above, the dissolution promoting mechanism 40 can control the partial pressure of carbon dioxide within the above range.

[0102] Furthermore, when the dissolution-promoting mechanism 40 is the aforementioned temperature and pressure control device, the upper limit of the temperature of the solution 20 controlled by the dissolution-promoting mechanism 40, from the viewpoint of improving the absorption efficiency of the carbon dioxide absorbent material 10 for carbonate ions, can be 10°C or 5°C. On the other hand, the lower limit of the aforementioned temperature can be set within the range where the solution 20 does not solidify, for example, it can be set to 1°C. In addition, the aforementioned temperature can be 1°C or higher and 10°C or lower, or 1°C or higher and 5°C or lower.

[0103] (Decentralized institutions)

[0104] The dispersion mechanism 50 disperses a plurality of carbon dioxide absorbent materials 10 in the solution 20. The dispersion mechanism 50 maintains an average particle size of the plurality of carbon dioxide absorbent materials 10. The lower limit of the average particle size maintained by the dispersion mechanism 50 can be 5 nm, 10 nm, or 15 nm. Conversely, the upper limit of the average particle size maintained by the dispersion mechanism 50 can be 500 nm, 200 nm, 100 nm, 50 nm, or 30 nm. Furthermore, the aforementioned average particle size can be 5 nm or more and 500 nm or less, 10 nm or more and 200 nm or less, 10 nm or more and 100 nm or less, 10 nm or more and 50 nm or less, 10 nm or more and 30 nm or less, or 15 nm or more and 30 nm or less. By providing the dispersion mechanism 50, this carbon dioxide absorption module 101 can easily maintain an appropriate particle size of the carbon dioxide absorbent materials 10 while suppressing aggregation.

[0105] The dispersion mechanism 50 functions particularly effectively when multiple carbon dioxide absorbent materials 10 tend to agglomerate. For example, when multiple carbon dioxide absorbent materials 10 are not disposed on the supports 71a, 71b, 71c, agglomeration of the carbon dioxide absorbent materials 10 may temporarily occur. In such cases, by using the dispersion mechanism 50 to disperse the multiple carbon dioxide absorbent materials 10 when supplying carbon dioxide to the solution 20, the appropriate particle size of the carbon dioxide absorbent materials 10 can be easily maintained. Furthermore, when the carbon dioxide absorbent materials 10 are disposed on the aforementioned porous particles, by providing the dispersion mechanism 50, the porous particles can be dispersed among themselves in the solution 20, and the appropriate particle size of the porous particles can be easily maintained. Further, by providing the dispersion mechanism 50, the carbon dioxide absorption module 101 can achieve overall homogenization of the system containing the solution 20, thereby facilitating the absorption of carbon dioxide by the carbon dioxide absorbent materials 10.

[0106] As the dispersion mechanism 50, a mechanism that generates a water flow in the solution 20 can be used, such as an ultrasonic generator, a stirring device, etc. Figure 1 (The image shows an ultrasonic wave generating device.)

[0107] (Solution adjustment mechanism)

[0108] The solution adjustment mechanism 60 supplies an alkaline substance to solution 20 when the pH of solution 20 decreases. Examples of such alkaline substances include the aforementioned salt and solutions containing the dissolved salt. The lower limit of the pH of solution 20 at which the solution adjustment mechanism 60 begins supplying the alkaline substance can be 5, 6, or 7. The solution adjustment mechanism 60 makes it easier to maintain an increased ratio of carbonate ions in solution 20. Therefore, it is easier to maintain carbon dioxide absorption efficiency. The solution adjustment mechanism 60 can control the start and end of the supply of the alkaline substance based on the display of the display mechanism 90 (described later).

[0109] (Display mechanism)

[0110] The display mechanism 90 shows the decrease in activity of the carbon dioxide absorbent material 10 when the activity decreases. By having such a display mechanism 90, the carbon dioxide absorption module 101 can easily control the environment of the solution 20 to maintain the carbon dioxide absorption efficiency.

[0111] As described above, in this carbon dioxide absorption module 101, the pH of solution 20 is related to the activity of carbon dioxide absorption material 10. Therefore, the display mechanism 90 may include a pH indicator or a pH meter. More specifically, the display mechanism 90 may include a pH indicator supplied to solution 20 or a pH meter capable of measuring the pH of solution 20. By displaying the pH of solution 20 with a pH indicator or a pH meter, a decrease in the activity of carbon dioxide absorption material 10 can be indicated.

[0112] [pH indicator]

[0113] As a pH indicator, an indicator that can show a decrease in the activity of the carbon dioxide absorption material 10 can be used. For example, bromocresol purple, bromothymol blue (BTB), phenol red, and neutral red can be used as indicators that can show changes around pH 6.

[0114] In this carbon dioxide absorption module 101, the dissolution rate of carbon dioxide in the solution 20 can be lower than or equal to the carbonation rate of the carbon dioxide absorption material 10. With this configuration, the carbon dioxide supplied from the supply unit 30 can be absorbed more reliably by the carbon dioxide absorption material 10. From this perspective, the upper limit of the ratio of the carbon dioxide content [ppm] in the gas released from the solution 20 (more specifically, the gas discharged from the exhaust mechanism 103 described later) to the carbon dioxide content [ppm] in the gas supplied from the supply unit 30 can be 0.8, 0.6, or 0.4. On the other hand, the lower limit of the above ratio is not particularly limited, and for example, it can be set to 0.1. Furthermore, the above ratio can be 0.1 or higher and 0.8 or lower, 0.1 or higher and 0.6 or lower, or 0.1 or higher and 0.4 or lower.

[0115] Carbon dioxide absorption device

[0116] The carbon dioxide absorption device 1 includes a carbon dioxide absorption module 101 and a storage tank 102 for storing a solution 20. Additionally, the carbon dioxide absorption device 1 includes an exhaust mechanism 103 for discharging gas released from the solution 20. In this carbon dioxide absorption device 1, the carbon dioxide absorption material 10 is immersed in the solution 20.

[0117] The carbon dioxide absorption device 1 includes the carbon dioxide absorption module 101, and the carbon dioxide absorption material 10 is immersed in the solution 20, thus the carbon dioxide absorption efficiency is excellent.

[0118] (Storage tank)

[0119] The shape of the storage tank 102 is appropriately set according to the shape of the carbon dioxide absorption module 101. The storage tank 102 is set in such a way that the carbon dioxide absorption unit 70 can be completely immersed in the solution 20 when the solution 20 is stored.

[0120] (Exhaust system)

[0121] The exhaust mechanism 103 is located at the top of the storage tank 102. The exhaust mechanism 103 discharges the gas that rises in the solution 20 and is released from the surface of the solution 20 to the outside of the carbon dioxide absorption device 1.

[0122] [Second Implementation]

[0123] Figure 5 The carbon dioxide absorption module 201 includes a carbon dioxide absorption material, a solution 20 covering the carbon dioxide absorption material, and a supply section 230 for supplying carbon dioxide to the solution 20. Figure 5 In the carbon dioxide absorption module 201, the carbon dioxide absorption tower 2 is configured.

[0124] The carbon dioxide absorption module 201 can cover the carbon dioxide absorption material with a solution 20 containing dissolved carbon dioxide. At this time, a portion of the dissolved carbon dioxide is converted into carbonate ions. Therefore, the carbon dioxide absorption material can easily absorb the carbonate ions dissolved in the solution 20. Thus, the carbon dioxide absorption module 201 exhibits excellent carbon dioxide absorption efficiency.

[0125] The size of the carbon dioxide absorption module 201 and the carbon dioxide absorption tower 2 is appropriately set according to the place of use and purpose. Hereinafter, the carbon dioxide absorption module 201 and the carbon dioxide absorption tower 2 equipped with the carbon dioxide absorption module 201 will be described in detail.

[0126] <Carbon Dioxide Absorption Module>

[0127] The carbon dioxide absorption module 201 absorbs carbonate ions generated in the solution 20 by covering the carbon dioxide absorption material with a solution 20 containing dissolved carbon dioxide. The carbon dioxide absorption module 201 includes multiple carbon dioxide absorption materials. Furthermore, the carbon dioxide absorption module 201 includes a receiving portion 240 for accommodating the multiple carbon dioxide absorption materials and a distributing mechanism 250 for distributing the solution 20 to the multiple carbon dioxide absorption materials.

[0128] (Carbon dioxide absorption materials)

[0129] The carbon dioxide absorption material used in this carbon dioxide absorption module 201 can be the same material as the carbon dioxide absorption material 10 in the first embodiment. In this carbon dioxide absorption module 201, the carbon dioxide absorption material can be disposed on the supports 71a, 71b, and 71c in the same manner as the carbon dioxide absorption material 10 in the first embodiment. Alternatively, the carbon dioxide absorption module 201 can also include multiple supports 71a, 71b, and 71c, just as in the first embodiment. The multiple supports 71a, 71b, and 71c can also be arranged with intervals between them; in this case, spacers can be disposed between the supports 71a, 71b, and 71c, just as in the first embodiment. In this carbon dioxide absorption module 201, the multiple carbon dioxide absorption materials, the multiple supports, and the spacers together constitute a carbon dioxide absorption section.

[0130] (solution)

[0131] Solution 20 is distributed by the dispersing mechanism 250, thereby continuously covering the plurality of carbon dioxide absorption materials. The solution 20 in this carbon dioxide absorption module 201 can be the same solution as that in the first embodiment. That is, solution 20 may contain a dissolution promoter that promotes the dissolution of carbon dioxide in solution 20, may contain a pH buffer, and may contain a salt that exhibits alkalinity in solution 20.

[0132] (Accommodation area)

[0133] The receiving portion 240 is a container for holding the aforementioned plurality of carbon dioxide absorbent materials. The receiving portion 240 houses the entire carbon dioxide absorption module. The receiving portion 240 has multiple openings for the solution 20 to pass through. More specifically, the receiving portion 240 has multiple openings that form flow paths for the solution 20, distributed from above by the distributing mechanism 250, to cover the plurality of carbon dioxide absorbent materials, and then flow out from below through the plurality of carbon dioxide absorbent materials. The carbon dioxide absorption module 201, by providing the receiving portion 240, can easily supply the solution 20 in a manner that ensures uniform contact with the plurality of carbon dioxide absorbent materials housed in predetermined positions.

[0134] (Distribution mechanism)

[0135] The distributing mechanism 250 is positioned above the receiving portion 240. The distributing mechanism 250 distributes the solution 20 upwards into the receiving portion 240. The distributing mechanism 250 is arranged to uniformly distribute the solution 20 within the receiving portion 240. This carbon dioxide absorption module 201, through the distributing mechanism 250, ensures uniform contact between the solution 20 and the aforementioned plurality of carbon dioxide absorption materials, thereby easily improving the carbon dioxide absorption efficiency. Furthermore, the solution 20 distributed by the distributing mechanism 250 contacts the carbon dioxide supplied from the supply portion 230 and moving towards the exhaust mechanism 204 (described later) in the form of droplets with a large surface area. Therefore, the carbon dioxide absorption efficiency is easily further improved. Moreover, according to this carbon dioxide absorption module 201, the solution 20 distributed by the distributing mechanism 250 does not remain in the receiving portion 240. Therefore, it is easy to control the solution 20 to an appropriate pH.

[0136] (Supply Department)

[0137] The supply unit 230 supplies gas containing carbon dioxide to the containing unit 240. Figure 5In this module, the supply unit 230 is configured to supply carbon dioxide-containing gas to the receiving unit 240 from below. More specifically, the carbon dioxide absorption module 201 has a flow path through which the solution 20, dispersed by the dispersing mechanism 250, falls downward through the receiving unit 240. The supply unit 230 supplies carbon dioxide-containing gas to this flow path from below the receiving unit 240. The supply unit 230 is configured such that the carbon dioxide supplied to the flow path dissolves in the solution 20 within the receiving unit 240. The supply unit 230 may also be configured to fill the flow path with carbon dioxide.

[0138] The supply unit 230 sprays a gas containing carbon dioxide into the aforementioned flow path. From the viewpoint of ensuring uniform dissolution of carbon dioxide in the gas supplied from the supply unit 230, the lower limit of the partial pressure of carbon dioxide can be 0.005 MPa or 0.010 MPa. On the other hand, from the viewpoint of operability of the carbon dioxide absorption module 201, the upper limit of the partial pressure can be, for example, 0.99 MPa. Furthermore, the partial pressure can be 0.005 MPa or higher and 0.99 MPa or lower, or 0.010 MPa or higher and 0.99 MPa or lower.

[0139] <Carbon Dioxide Absorption Tower>

[0140] The carbon dioxide absorption tower 2 is a wet scrubber. The carbon dioxide absorption tower 2 includes the carbon dioxide absorption module 201. In addition, the carbon dioxide absorption tower 2 includes: a housing 203 on which the carbon dioxide absorption module 201 is disposed, an exhaust mechanism 204 for discharging gas from the housing 203, and a pump 205 for circulating the solution 20 flowing out from the containment section 240 to the distribution mechanism 250.

[0141] The carbon dioxide absorption tower 2 is equipped with the carbon dioxide absorption module 201, thus it has excellent carbon dioxide absorption efficiency.

[0142] (case)

[0143] The housing 203 has a vertically extending cylindrical portion and a storage portion disposed below the cylindrical portion. The cylindrical portion is, for example, cylindrical. A dispensing mechanism 250 is disposed on the upper part of the cylindrical portion. Furthermore, a receiving portion 240 is disposed on the cylindrical portion below the dispensing mechanism 250. The receiving portion 240 is arranged such that it partially blocks the internal space of the cylindrical portion along its axial direction. A supply portion 230 is connected to the peripheral wall of the cylindrical portion below the receiving portion 240. The region in the internal space of the cylindrical portion below the dispensing mechanism 250 forms the flow path of the solution 20.

[0144] The aforementioned storage section is continuously provided at the lower end of the aforementioned cylindrical section. The aforementioned storage section stores the solution 20 that has been distributed by the dispensing mechanism 250 and passed through the receiving section 240. Carbon dioxide may be dissolved in the solution 20 stored in the aforementioned storage section.

[0145] A water supply mechanism 206 and a drainage mechanism 207 are connected to the aforementioned storage section. The water supply mechanism 206 and the drainage mechanism 207 can supply solution 20 to the storage section or drain solution 20 stored in the storage section to adjust its pH. The water supply mechanism 206 can also be configured as the aforementioned solution adjustment mechanism. Additionally, the aforementioned display mechanism can also be installed in the storage section.

[0146] (Exhaust system)

[0147] The exhaust mechanism 204 is positioned above the receiving portion 240. For example, the exhaust mechanism 204 is positioned at the top of the aforementioned cylindrical portion.

[0148] (pump)

[0149] Pump 205 draws up the solution 20 stored in the above-mentioned storage section and circulates it to the distribution mechanism 250.

[0150] [Third Implementation Method]

[0151] Methods for carbon dioxide absorption

[0152] Figure 6 The carbon dioxide absorption method includes a step of contacting carbonate ions with a carbon dioxide absorption material covered by a solution (hereinafter also referred to as "contact step S2"). Additionally, the carbon dioxide absorption method includes a step of dissolving carbon dioxide in the aforementioned solution (hereinafter also referred to as "dissolution step S1").

[0153] In this carbon dioxide absorption method, the solution covers the carbon dioxide absorbing material, thereby promoting the carbonation of the carbon dioxide absorbing material. Therefore, this carbon dioxide absorption method exhibits excellent carbon dioxide absorption efficiency.

[0154] This carbon dioxide absorption method can be performed using either the carbon dioxide absorption module 101 or the carbon dioxide absorption module 201 described above. The carbon dioxide absorption method will now be described in detail.

[0155] (Dissolving process)

[0156] The dissolution process S1, for example, when using the carbon dioxide absorption module 101 described in the first embodiment, is performed by supplying a gas containing carbon dioxide from the supply unit 30 to the solution 20. Alternatively, if the carbon dioxide absorption module 201 described in the second embodiment is used, the dissolution process S1 is performed by supplying a gas containing carbon dioxide from the supply unit 230 to the solution 20 dispersed by the dispersing mechanism 250.

[0157] In the dissolution step S1, the dissolution of carbon dioxide in the solution 20 can be promoted by the dissolution promoting mechanism 40 described above. Furthermore, in the dissolution step S1, the dispersion mechanism 50 can disperse multiple carbon dioxide absorbent materials 10 in the solution 20. Further, in the dissolution step S1, the solution adjusting mechanism 60 can supply an alkaline substance to the solution 20, and the display mechanism 90 can display the decrease in the activity of the carbon dioxide absorbent materials.

[0158] (Contact process)

[0159] In the contacting process S2, carbonate ions are brought into contact with the carbon dioxide absorbent material, causing the carbon dioxide absorbent material to absorb carbonate ions. For example, when using the carbon dioxide absorbent module 101 described in the first embodiment, contacting process S2 involves bringing carbonate ions generated in the solution 20 into contact with the carbon dioxide absorbent material 10 impregnated in the solution 20. Alternatively, when using the carbon dioxide absorbent module 201 described in the second embodiment, contacting process S2 involves passing the solution 20 containing carbonate ions through the receiving portion 240, thereby bringing the carbonate ions into contact with multiple carbon dioxide absorbent materials 10.

[0160] In this carbon dioxide absorption method, as a step to allow the aforementioned carbon dioxide absorption material to absorb carbonate ions, a dissolution step S1 and a contact step S2 are performed sequentially. On the other hand, as a whole, the aforementioned carbon dioxide absorption modules 101 and 201 can perform the dissolution step S1 and the contact step S2 in parallel. In this case, the dissolution rate of carbon dioxide in the solution 20 can be lower than or equal to the carbonation rate of the carbon dioxide absorption material 10.

[0161] Furthermore, this carbon dioxide absorption method can include a step (also known as a "recovery step") after the contact step S2 to recover the carbon dioxide absorption material that has absorbed carbonate ions.

[0162] [Other Implementation Methods]

[0163] The embodiments disclosed herein should be considered illustrative rather than restrictive in all respects. The scope of the invention is not limited to the configurations involved in the above embodiments, as indicated by the claims, and is intended to include all modifications equivalent to and within the scope of the claims.

[0164] The carbon dioxide absorption module can also be configured in devices other than the carbon dioxide absorption device and carbon dioxide absorption tower described in the above embodiments.

[0165] The configuration of the carbon dioxide absorbent material described above is not limited to the structure described in the above embodiments. For example, the carbon dioxide absorbent material may not be disposed on the support. In addition, the carbon dioxide absorbent material may be further disposed on other supports while still being disposed on the porous particles.

[0166] The solution may contain an emulsifier (surfactant). By including an emulsifier in the solution, the emulsifier adsorbs onto the carbon dioxide absorbent material to form micelles, thereby inhibiting the aggregation of the carbon dioxide absorbent material and easily maintaining the appropriate particle size of the carbon dioxide absorbent material.

[0167] From the viewpoint of sufficiently suppressing the aggregation of the aforementioned carbon dioxide absorbent material, the lower limit of the HLB value of the emulsifier can be 4 or 6. On the other hand, the upper limit of the HLB value of the aforementioned emulsifier is not particularly limited, and for example, it can be set to 20. In addition, the HLB value of the aforementioned emulsifier can be 4 or more and 20 or less, or it can be 6 or more and 20 or less.

[0168] From the viewpoint of maintaining the stability of the micelles, the lower limit of the absolute value of the zeta potential of the micelles formed by the above-mentioned emulsifier can be 20 mV or 25 mV. On the other hand, the upper limit of the absolute value of the zeta potential of the micelles is not particularly limited, and for example, it can be set to 40 mV. In addition, the absolute value of the zeta potential of the micelles can be more than 20 mV and less than 40 mV, or more than 25 mV and less than 40 mV.

[0169] In the above embodiments, water is used as the solvent of the solution, but this disclosure is not limited thereto. For example, organic solvents can be used as the solvent.

[0170] One or both of the aforementioned dissolution promoting mechanism and dispersion mechanism may be omitted if carbon dioxide can be adequately absorbed by the aforementioned carbon dioxide absorbing material. Furthermore, the aforementioned solution may also be composed of a substance that does not contain one or both of the aforementioned dissolution promoting agent and pH buffer. Further, the carbon dioxide absorption module may also omit the aforementioned display mechanism and solution adjustment mechanism, provided that it can prevent a decrease in the activity of the aforementioned carbon dioxide absorbing material and can predict a decrease in activity.

[0171] Example

[0172] The present disclosure will be described in more detail below through embodiments, but the present disclosure is not limited to the following embodiments.

[0173] [No.1]

[0174] A tray is placed at the bottom of a cubic-shaped reaction vessel, on which 300g of powdered carbon dioxide absorbent material is placed. Magnesium oxide (manufactured by TATEHO Chemical Industry Co., Ltd., TATEHOMAG (registered trademark) #1100) is used as the carbon dioxide absorbent material.

[0175] 300g of solution was supplied to the above reaction vessel and allowed to stand. The carbon dioxide concentration (dissolved inorganic carbon concentration) of this solution was 1.83 × 10⁻⁶. -3 mol / L. At this point, the carbon dioxide absorbent powder is in a state containing solution, but the liquid surface cannot be observed; it is not yet covered by the solution.

[0176] [No.2]

[0177] 50g of powdered carbon dioxide absorbent and 100g of water were impregnated in an 8cm square piece of cloth used as a support. Magnesium oxide (manufactured by TATEHO Chemical Industry Co., Ltd., TATEHOMAG (registered trademark) #1100) was used as the carbon dioxide absorbent. The cloth was then placed in a cubic-shaped reaction vessel.

[0178] The solution is supplied to the reaction vessel in such a way that it is completely impregnated with the cloth. The dissolved inorganic carbon concentration of the solution is 1.73 × 10⁻⁶. -3 mol / L. Additionally, the reaction vessel was stirred using a bubbling device (Marintec, product number: ASQ-50).

[0179] <Evaluation>

[0180] For No. 1, the dissolved inorganic carbon concentration in the solution was measured after 170 minutes, and the result was 6.63 × 10⁻⁶. -5 mol / L. Additionally, for No. 2, the dissolved inorganic carbon concentration of the solution was measured after 178 minutes, and the result was 6.24 × 10⁻⁶ mol / L. -5 mol / L. Therefore, the change in dissolved inorganic carbon concentration per 1 kg of carbon dioxide absorbent material is 3.45 × 10⁻⁶ mol / L in No. 1. -5 mol / L·min, in No.2 it is 1.88×10 -4 mol / L·min. It is estimated that the absorption rate of carbonate ions in No.2 is 5.45 times that of No.1.

[0181] The above demonstrates that the carbon dioxide absorption efficiency is improved by covering the carbon dioxide absorption material with a solution.

[0182] Explanation of reference numerals in the attached figures

[0183] 1: Carbon dioxide absorption device;

[0184] 2: Carbon dioxide absorption tower;

[0185] 10: Carbon dioxide absorption materials;

[0186] 20: Solution;

[0187] 30, 230: Supply Department;

[0188] 40: Dissolution facilitator;

[0189] 50: Dispersion mechanism (ultrasonic generating device);

[0190] 60: Solution adjustment mechanism;

[0191] 70: Carbon dioxide absorption section;

[0192] 71a, 71b, 71c: Support body;

[0193] 72: Spacer;

[0194] 90: Display device (pH indicator or pH meter);

[0195] 101, 201: Carbon dioxide absorption modules;

[0196] 102: Storage tank;

[0197] 103, 204: Exhaust mechanism;

[0198] 203: Shell;

[0199] 205: Pump;

[0200] 206: Water supply organizations;

[0201] 207: Drainage system;

[0202] 240: Reception area;

[0203] 250: Distribution mechanism.

Claims

1. A carbon dioxide absorption module, wherein, The carbon dioxide absorption module includes: Multiple granular carbon dioxide absorbent materials; Multiple porous supports are provided with the aforementioned multiple carbon dioxide absorption materials; The solution covers the plurality of carbon dioxide absorbent materials; The supply unit supplies carbon dioxide to the solution; and A bubble generating device promotes the dissolution of carbon dioxide into the solution. The carbon dioxide absorption material is a layered double hydroxide, an alkaline metal oxide, or an alkaline metal hydroxide. The support is a porous sheet or porous filament. The plurality of supports are arranged at intervals from each other. The solution contains water as a solvent.

2. The carbon dioxide absorption module according to claim 1, wherein, The carbon dioxide absorption module has a dissolution-promoting mechanism other than the bubble-generating device that promotes the dissolution of carbon dioxide into the solution.

3. The carbon dioxide absorption module according to claim 1 or 2, wherein, The solution contains a dissolution promoter that facilitates the dissolution of the carbon dioxide into the solution.

4. The carbon dioxide absorption module according to claim 1 or 2, wherein, The dissolution rate of carbon dioxide in the solution is below the carbonation rate of the plurality of carbon dioxide absorbing materials.

5. The carbon dioxide absorption module according to claim 1 or 2, wherein, The average particle size of the plurality of carbon dioxide absorbers is greater than 5 nm and less than 500 nm.

6. The carbon dioxide absorption module according to claim 5, wherein, The carbon dioxide absorption module includes a dispersion mechanism that disperses the plurality of carbon dioxide absorption materials in the solution. The dispersion mechanism maintains the average particle size of the plurality of carbon dioxide absorbent materials at a level above 5 nm and below 500 nm.

7. The carbon dioxide absorption module according to claim 1 or 2, wherein, The solution has a pH greater than 6.

8. The carbon dioxide absorption module according to claim 7, wherein, The solution contains a pH buffer.

9. The carbon dioxide absorption module according to claim 7, wherein, The carbon dioxide absorption module has a solution adjustment mechanism for supplying alkaline substances to the solution.

10. The carbon dioxide absorption module according to claim 1 or 2, wherein, The carbon dioxide absorption module has a display mechanism that shows the decrease in activity when the activity of the carbon dioxide absorption material decreases.

11. The carbon dioxide absorption module according to claim 1 or 2, wherein, The carbon dioxide absorption module has a dispersing mechanism for distributing the solution to the plurality of carbon dioxide absorption materials.

12. The carbon dioxide absorption module according to claim 11, wherein, The carbon dioxide absorption module has a receiving portion for accommodating the plurality of carbon dioxide absorption materials.

13. A carbon dioxide absorption tower, wherein, The carbon dioxide absorption tower is equipped with the carbon dioxide absorption module as described in claim 1 or 2.

14. A carbon dioxide absorption device, wherein, The carbon dioxide absorption device includes: The carbon dioxide absorption module as described in claim 1 or 2; and Storage tank for storing the solution. The plurality of carbon dioxide absorbent materials are impregnated in the solution.

15. A method for carbon dioxide absorption, wherein, The carbon dioxide absorption method comprises: The process of dissolving carbon dioxide in a solution; and The process of contacting carbonate ions generated from the carbon dioxide during the dissolution process with a plurality of particulate carbon dioxide absorbent materials covered by the solution. The carbon dioxide absorption material is a layered double hydroxide, an alkaline metal oxide, or an alkaline metal hydroxide, and the plurality of carbon dioxide absorption materials are disposed on a plurality of porous supports. The support is a porous sheet or porous filament. The plurality of supports are arranged at intervals from each other. The solution contains water as a solvent. In the dissolution process, the aerated carbon dioxide is supplied to the solution.

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