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

Abstract

A carbon dioxide absorption module according to one embodiment of the present disclosure is provided with a carbon dioxide absorption material, a solution that covers the carbon dioxide absorption material, and a supply unit that supplies carbon dioxide to the solution.

Description

Technical Field

[0001] The present disclosure relates to a carbon dioxide absorption module, a carbon dioxide absorption tower, a carbon dioxide absorption device and a carbon dioxide absorption method. Background Art

[0002] In order to collect carbon dioxide in industrial facilities, living spaces, and the like, the use of materials capable of absorbing carbon dioxide (hereinafter also referred to as “carbon dioxide absorbing materials”) has been studied (see Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

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

[0006] A carbon dioxide absorption module according to one embodiment of the present disclosure includes a carbon dioxide absorption material, a solution covering the carbon dioxide absorption material, and a supply unit that supplies carbon dioxide to the solution. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0008] Figure 2 yes Figure 1 Schematic II-II line cross-sectional view of the carbon dioxide absorption device.

[0009] Figure 3 Yes means Figure 1 Schematic cross-sectional view of a modified example of a support body in a carbon dioxide absorption module.

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

[0011] Figure 5 This means that Figure 1 Schematic diagram of a carbon dioxide absorption module according to different embodiments and a carbon dioxide absorption tower having the same.

[0012] Figure 6 This is a flow chart showing a carbon dioxide absorption method according to one embodiment of the present disclosure. DETAILED DESCRIPTION

[0013] [Problems to be Solved by the Present Disclosure]

[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 that a gas containing water and carbon dioxide and a carbon dioxide absorbing material are placed in a sealed container, thereby absorbing carbon dioxide through the carbon dioxide absorbing material. However, when the technology described in Patent Document 1 is used, it is difficult to fully absorb carbon dioxide due to a lack of water or the like.

[0015] The present disclosure has been made based on the above circumstances, and an object of the present disclosure is to provide a carbon dioxide absorption module having excellent carbon dioxide absorption efficiency.

[0016] [Effects of the present disclosure]

[0017] A carbon dioxide absorption module according to one embodiment of the present disclosure has excellent carbon dioxide absorption efficiency.

[0018] [Description of Embodiments of the Present Disclosure]

[0019] First, embodiments of the present disclosure will be described below.

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

[0021] The carbon dioxide absorption module can cover the carbon dioxide absorption material by the solution in which carbon dioxide is dissolved. At this time, a part of the dissolved carbon dioxide changes into carbonate ions. Therefore, the carbon dioxide absorption material can easily absorb the carbonate ions dissolved in the solution. Therefore, the carbon dioxide absorption module has excellent carbon dioxide absorption efficiency.

[0022] (2) In the above (1), the carbon dioxide absorbent may be a layered double hydroxide, an alkaline metal oxide or an alkaline metal hydroxide. When the carbon dioxide absorbent is a layered double hydroxide, an alkaline metal oxide or an alkaline metal hydroxide, the carbonate ions in the solution can be more easily absorbed.

[0023] (3) In the above (1) or (2), a dissolution promoting mechanism for promoting the dissolution of the carbon dioxide into the solution may be provided. By providing such a dissolution promoting mechanism, it is easy to increase the carbonate ions in the solution. Therefore, the absorption efficiency of carbon dioxide can be further improved.

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

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

[0026] (6) In any of the above (1) to (5), a plurality of the above-mentioned carbon dioxide absorbing materials may be provided, and the average particle size of the above-mentioned plurality of carbon dioxide absorbing materials may be greater than 5 nm and less than 500 nm. By making the average particle size of the above-mentioned plurality of carbon dioxide absorbing materials greater than the above-mentioned lower limit, the contact area between the above-mentioned carbon dioxide absorbing material and the above-mentioned solution can be increased. In addition, by making the above-mentioned average particle size less than the above-mentioned upper limit, it is easy for carbonate ions to penetrate into the crystal interior of the above-mentioned carbon dioxide absorbing material. Therefore, the absorption efficiency of carbon dioxide can be further improved.

[0027] (7) In the above (6), a dispersing mechanism for dispersing the plurality of carbon dioxide absorbers in the solution may be provided, wherein the dispersing mechanism maintains an average particle size of the plurality of carbon dioxide absorbers at a range of 5 nm to 500 nm. By providing the dispersing mechanism for dispersing the plurality of carbon dioxide absorbers in the solution, aggregation of the carbon dioxide absorbers can be suppressed, and an appropriate particle size of the carbon dioxide absorbers can be easily maintained.

[0028] (8) In any one of (1) to (7) above, the pH of the solution may 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 in a manner that increases the ratio of carbonate ions. Therefore, the absorption efficiency of carbon dioxide can be further improved.

[0029] (9) In any one of (1) to (8) above, the solution may contain a pH buffer. By making the solution contain a pH buffer, 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 absorption efficiency of carbon dioxide.

[0030] (10) In any one of the above (1) to (9), a solution adjustment mechanism for supplying an alkaline substance to the above solution may 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 above solution is increased. Therefore, it is easy to maintain the absorption efficiency of carbon dioxide.

[0031] (11) In any of the above (1) to (10), a display device for displaying the decrease in activity when the activity of the carbon dioxide absorber decreases may be provided. By providing such a display device for displaying the decrease in activity of the carbon dioxide absorber, it is easy to control the environment of the solution to maintain the carbon dioxide absorption efficiency.

[0032] (12) In any of the above (1) to (11), a plurality of the carbon dioxide absorbing materials may be provided, and a spreading mechanism for spreading the solution to the plurality of carbon dioxide absorbing materials may be provided. By providing the spreading mechanism for spreading the solution to the plurality of carbon dioxide absorbing materials, the solution can be brought into uniform contact with the plurality of carbon dioxide absorbing materials. This makes it easy to improve the carbon dioxide absorption efficiency.

[0033] (13) In the above (12), a storage unit for storing the plurality of carbon dioxide absorbers may be provided. By providing the storage unit for storing the plurality of carbon dioxide absorbers, it is easy to supply the solution so as to uniformly contact the plurality of carbon dioxide absorbers stored at predetermined positions.

[0034] (14) In any one of the above (1) to (13), a porous support on which the carbon dioxide absorber is arranged may be provided. By providing a porous support on which the carbon dioxide absorber is arranged, the carbon dioxide absorber can be easily and stably held.

[0035] (15) In the above (14), the support may be porous particles, and the average particle size of the porous particles in the state where the carbon dioxide absorbent is arranged is 10 mm or less. By making the average particle size of the porous particles below the upper limit, the overall homogenization of the system is achieved, thereby easily improving the absorption efficiency of carbonate ions by the carbon dioxide absorbent. In addition, from the viewpoint of easily arranging the carbon dioxide absorbent on the porous particles, the lower limit of the average particle size of the porous particles may be 1.0×10 -5 mm.

[0036] (16) In the above (14), the support may be a porous thread or a porous sheet, and a plurality of the carbon dioxide absorbers may be arranged on the support. By making the support a porous thread or a porous sheet, and by arranging the plurality of carbon dioxide absorbers on the support, carbonate ions can be easily and reliably brought into contact with the plurality of carbon dioxide absorbers.

[0037] (17) In any of the above (14) to (16), the support may be provided in plurality, and the plurality of supports may be arranged at intervals from each other. By arranging the plurality of supports at intervals from each other, the plurality of carbon dioxide absorbers may be easily and stably kept in a state where they are in easy contact with carbonate ions.

[0038] (18) A carbon dioxide absorption tower according to another aspect of the present disclosure includes the carbon dioxide absorption module according to any one of (1) to (17) above.

[0039] Since the carbon dioxide absorption tower includes the carbon dioxide absorption module, the carbon dioxide absorption efficiency is excellent.

[0040] (19) A carbon dioxide absorption device according to another aspect of the present invention comprises the 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, so the carbon dioxide absorption efficiency is excellent.

[0042] (20) A carbon dioxide absorption method according to another aspect of the present disclosure includes a step of bringing carbonate ions into contact with a carbon dioxide absorption material covered with a solution.

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

[0044] In the present disclosure, "the solution covering the carbon dioxide absorbent" is not limited to a structure in which the carbon dioxide absorbent is always covered with the solution, as long as the carbon dioxide absorbent is partially covered with the solution. In addition, the carbon dioxide absorbent is not limited to a structure in which the entire carbon dioxide absorbent is covered with the solution. Furthermore, the carbon dioxide absorbent may be in contact with a member such as a cloth for transmitting the solution, or may be provided to be covered with the solution transmitted through the member. The form of carbon dioxide supplied by the "supply unit" is not limited to a gas, but may be in a state of being dissolved in a solution. That is, the supply unit may supply carbon dioxide in the form of carbonate ions, for example. "Particle size" refers to the particle size in secondary particles. However, in the case of not constituting secondary particles, it refers to the particle size of primary particles. "Average particle size" refers to the median particle size (D50) at which the volume-based cumulative distribution calculated in accordance with JIS-Z-8819-2:2001 becomes 50%.

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

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

[0047] [First embodiment]

[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 unit 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 in which carbon dioxide is dissolved. At this time, part of the dissolved carbon dioxide changes into carbonate ions. Therefore, the carbon dioxide absorption material 10 can easily absorb the carbonate ions dissolved in the solution 20. Therefore, the carbon dioxide absorption module 101 has 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 sizes of the carbon dioxide absorption module 101 and the carbon dioxide absorption device 1 are appropriately set according to the place of use and purpose. Hereinafter, the carbon dioxide absorption module 101 and the carbon dioxide absorption device 1 having the carbon dioxide absorption module 101 are described in detail.

[0051] <Carbon dioxide absorption module>

[0052] The carbon dioxide absorption module 101 covers the carbon dioxide absorption material 10 with the solution 20 in which carbon dioxide is dissolved, so that the carbon dioxide absorption material 10 absorbs carbonate ions generated in the solution 20. The carbon dioxide absorption module 101 includes a plurality of carbon dioxide absorption materials 10. In addition, the carbon dioxide absorption module 101 includes: a dissolution promotion mechanism 40 for promoting the dissolution of carbon dioxide into the solution 20; a dispersion mechanism 50 for dispersing the plurality of 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 the decrease in the activity of the carbon dioxide absorption material 10; and a porous support body 71a on which the carbon dioxide absorption material 10 is arranged.

[0053] (Carbon dioxide absorbing material)

[0054] The carbon dioxide absorbing material 10 is in a granular form, more specifically in a powdered form. As the carbon dioxide absorbing material 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. As the carbon dioxide absorbing material 10, for example, layered double hydroxides (LDH: Layered Double Hydroxite), alkaline metal oxides, and alkaline metal hydroxides can be listed. The carbon dioxide absorbing material 10 is a layered double hydroxide, an alkaline metal oxide, or an alkaline metal hydroxide, which can more easily absorb carbonate ions in the solution 20. In the carbon dioxide absorption module 101, as the carbon dioxide absorbing material 10, only one of the layered double hydroxide, the alkaline metal oxide, and the alkaline metal hydroxide may be included, or two or more thereof may be included.

[0055] 〔Layered double hydroxide〕

[0056] The layered double hydroxide absorbs carbonate ions and then releases carbon dioxide by heating at a relatively low temperature. Therefore, the layered double hydroxide can improve the recycling efficiency of the carbon dioxide absorbent 10.

[0057] The layered double hydroxide may 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- is an n-valent anion, x is a number greater than or equal to 0.2 and less than or equal to 0.33, and n is an integer greater than or equal to 1. Examples of M1 include Mg, Mn, Ni, and Zn. Examples of M2 include Al, Cr, Fe, and Co. n- OH - , Cl - 、NO3 - 、CO3 2- 、SO4 2- , [Fe(CN)6] 3- The above-mentioned layered double hydroxide can be in solution 20 in the basic layer [M1 1-x 2+ M2 x 3+ (OH)2] x+ Between intake of A n- As the layered double hydroxide, it can be a Mg-Al system in which M1 is Mg and M2 is Al, a Mg-Fe system in which M1 is Mg and M2 is Fe, a Fe-Fe system in which both M1 and M2 are Fe, or a Zn-Al system in which M1 is Zn and M2 is Al. By making the layered double hydroxide into a Mg-Al system, a Mg-Fe system, a Fe-Fe system or a Zn-Al system, it is possible to easily take in carbonate ions (CO3 2- ) as A n- .

[0060] 〔Basic metal oxide〕

[0061] The basic metal oxide absorbs a larger ratio of carbonate ions per mole of the metal content than the layered double hydroxide. Therefore, the use of the basic metal oxide can improve the absorption efficiency of carbon dioxide.

[0062] The alkaline metal oxide may be a compound represented by the chemical formula MO (M is a metal). Examples of M include Ca, Mg, and Ba. The alkaline metal oxide may be oxidized in the solution 20 to generate an alkaline metal hydroxide (M(OH)2), which may then react with carbonate ions (CO3 2- ) reacts to become MCO 3 . That is, the above-mentioned basic metal oxide is easily carbonated by reacting with carbonate ions in the solution 20. In addition, the above-mentioned basic metal oxide after carbonation can be reused by heating.

[0063] 〔Alkaline metal hydroxide〕

[0064] A material prepared in the form of an alkaline metal hydroxide can be used as the carbon dioxide absorbent 10. By using the alkaline metal hydroxide as the carbon dioxide absorbent 10, the solution 20 can be easily kept alkaline. As a result, the solution 20 can be easily maintained in a state where the ratio of carbonate ions is high.

[0065] As the lower limit of the average particle size of the plurality of carbon dioxide absorbent materials 10, from the viewpoint of increasing the contact area between the carbon dioxide absorbent material 10 and the solution 20, it can be 5 nm, 10 nm, or 15 nm. On the other hand, as the upper limit of the above-mentioned average particle size, from the viewpoint of making it easy for carbonate ions to penetrate into the crystal interior of the carbon dioxide absorbent material 10, it can be 500 nm, 200 nm, 100 nm, 50 nm, or 30 nm. In addition, as the above-mentioned average particle size, it 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.

[0066] (Supporting body)

[0067] A plurality of carbon dioxide absorbing materials 10 are arranged on the support 71a. The carbon dioxide absorbing module 101 can stably hold the carbon dioxide absorbing material 10 by including the support 71a. In addition, according to this structure, it is easy to recover the carbon dioxide absorbing material 10 after absorbing carbon dioxide. Therefore, it is easy to use the carbon dioxide absorbed by the carbon dioxide absorbing module 101 for other purposes.

[0068] exist Figure 1 as well as Figure 2 In the embodiment, the support body 71a is a porous sheet. That is, Figure 1 as well as Figure 2 In the embodiment, a plurality of carbon dioxide absorbers 10 are arranged on a porous sheet. Since the support 71a is a porous sheet, the carbon dioxide absorber 10 can be easily and reliably contacted with carbonate ions. In addition, a plurality of carbon dioxide absorbers 10 are arranged at intervals on a porous sheet. Since the support 71a is a porous sheet, the plurality of carbon dioxide absorbers 10 can be easily arranged at intervals. As a result, the aggregation of the carbon dioxide absorber 10 is easily suppressed, and the absorption effect of the carbon dioxide absorber 10 on carbonate ions is improved.

[0069] Examples of the support 71a include cloth, nonwoven fabric sheets, fabric sheets, sponge sheets, cellulose fiber sheets such as Japanese paper, carbon fiber sheets, ceramic fiber sheets such as alumina, and metal fiber sheets such as copper and stainless steel. In addition, the support 71a may be subjected to surface treatment such as gold plating or resin coating to prevent deterioration and corrosion caused by the solution 20 described later.

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

[0071] The support is not limited to the porous sheet, and may be, for example, porous particles or porous fibers. Figure 3 as well as Figure 4 , the structure in which the carbon dioxide absorbent 10 is arranged on the porous particles or the porous fibers is described. In addition, even in the case of being arranged on the porous particles or the porous fibers, the carbon dioxide absorbent 10 may be arranged on the surface of the support 71b, 71c, or may be arranged inside the support 71b, 71c. In addition, the support 71b, 71c may be supported on the surface or pores of the support 71b, 71c as a carrier.

[0072] Figure 3 The support body 71b is a porous particle. Figure 3 In the embodiment, a plurality of carbon dioxide absorbers 10 are arranged in one porous particle. More specifically, a plurality of carbon dioxide absorbers 10 are arranged in one porous particle at intervals. By arranging in this way, it is easy to suppress the aggregation of the carbon dioxide absorbers 10, and the absorption effect of the carbon dioxide absorbers 10 on carbonate ions is improved.

[0073] Examples of porous particles include silica gel, water-absorbing polymers, activated carbon particles, porous glass, and porous metal particles. In order to prevent deterioration and corrosion caused by the solution 20 described later, the porous particles may be subjected to surface treatment such as gold plating or resin coating. From the perspective of easy configuration of the carbon dioxide absorbent 10, the lower limit of the average particle size of the porous particles may be 2 times, 5 times, or 10 times the average particle size of the carbon dioxide absorbent 10. In addition, the lower limit of the average particle size of the porous particles may be 1.0×10 -5 mm, or 2.5×10 -5 mm, and can also be 5.0×10 -5mm. From the viewpoint of easily improving the absorption efficiency of carbonate ions by the carbon dioxide absorbent 10 by achieving uniformity of the entire system, the upper limit of the average particle size of the porous particles may be 10 mm. The upper limit of the average particle size of the porous particles may be 200 times, 100 times, or 50 times the average particle size of the carbon dioxide absorbent 10. The average particle size of the porous particles may be more than 2 times and less than 200 times the average particle size of the carbon dioxide absorbent 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 porous particles may be 1.0×10 -5 mm or more and 10 mm or less, or 2.5×10 -5 mm or more and 10 mm or less, and 5.0×10 -5 mm or more and 10 mm or less.

[0074] Figure 4 The support body 71c is a porous wire. Figure 4 In the embodiment, a plurality of carbon dioxide absorbers 10 are arranged on a porous thread. Since the support body 71c is a porous thread, carbonate ions can be easily and reliably contacted with the plurality of carbon dioxide absorbers 10. In addition, a plurality of carbon dioxide absorbers 10 are arranged at intervals on a porous thread. Since the support body 71c is a porous thread, the plurality of carbon dioxide absorbers 10 can be easily arranged at intervals. As a result, the aggregation of the carbon dioxide absorbers 10 is easily suppressed, and the absorption effect of the carbon dioxide absorbers 10 on carbonate ions is improved.

[0075] The porous fiber is not particularly limited as long as it has a plurality of holes, and for example, a hollow fiber membrane having a fibrous skeleton can be used.

[0076] The lower limit of the average pore diameter of the supports 71a, 71b, and 71c may be equal to, 3 times, 5 times, or 10 times the average particle diameter of the carbon dioxide absorbent 10 from the viewpoint of ensuring air permeability or from the viewpoint of facilitating the support of the carbon dioxide absorbent 10. The upper limit of the average pore diameter of the supports 71a, 71b, and 71c is not particularly limited, and may be, for example, 100 times the average particle diameter of the carbon dioxide absorbent 10. Here, the "average pore diameter" is calculated from the BET specific surface area and pore volume determined by the gas adsorption method in accordance with JIS-Z-8830-2:2013.

[0077] The number of the above-mentioned supports in the carbon dioxide absorption module 101 is not particularly limited, and may be one or more. In the case where the carbon dioxide absorption module 101 has a plurality of the above-mentioned supports, these supports may be any one of the above-mentioned porous sheets, the above-mentioned porous particles, and the above-mentioned porous fibers, or two or more of the above-mentioned porous sheets, the above-mentioned porous particles, and the above-mentioned porous fibers may be used in combination.

[0078] When the carbon dioxide absorption module 101 has a plurality of the supports, the plurality of supports may be arranged at intervals from each other. With such a configuration, the plurality of carbon dioxide absorption materials 10 can be easily and stably held in a state where they are easily in contact with carbonate ions.

[0079] like Figure 1 as well as Figure 2 As shown in FIG. 1 , when a plurality of support bodies 71 a are arranged at intervals from each other, these support bodies 71 a may be arranged via spacers 72. Figure 1 as well as Figure 2 In the carbon dioxide absorption module 101, the plurality of supports 71a are alternately arranged with the spacers 72 in the thickness direction thereof. More specifically, the plurality of supports 71a are arranged alternately with the spacers 72 so that one side is in contact with the spacers 72. The plurality of supports 71a may also be fixed to the spacers 72. In the carbon dioxide absorption module 101, the plurality of carbon dioxide absorption materials 10, the plurality of supports 71a, and the plurality of spacers 72 constitute the carbon dioxide absorption unit 70 as a whole.

[0080] The spacer 72 is, for example, in the shape of a plate. The spacer 72 is arranged alternately with the support 71a in a state where its plate surface is in contact with the support 71a. The spacer 72 is a porous body. The spacer 72 is a porous body, thereby constituting a passage for carbonate ions to reach the carbon dioxide absorbing material 10. As the spacer 72, for example, a mesh body and a sponge body can be cited. In addition, the spacer 72 is not limited to a plate shape, and can also be a rod-shaped member that only contacts a part of the support 71a. The carbon dioxide absorption module 101 is provided with a spacer 72, so that a plurality of supports 71a can be easily arranged at a high density while being spaced apart from each other.

[0081] (Supply Department)

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

[0083] (Solution)

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

[0085] The solution 20 contains water as a solvent. In addition, the solution 20 may contain a dissolution promoter that promotes the dissolution of carbon dioxide in the solution 20 , may contain a pH buffer material, and may contain a salt that exhibits alkalinity in the solution 20 .

[0086] A gas containing carbon dioxide is supplied from the supply unit 30 to the solution 20. As a result, a chemical equilibrium represented by the following formula (2) and the following formula (3) is generated in the solution 20, and carbonate ions (CO3 2- ). In the following formula (2) and the following formula (3), aq represents a hydrated state.

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

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

[0089] The pH of the solution 20 may be greater than 6. By configuring in this way, the chemical balance in the solution 20 is easily transferred in a manner that increases the ratio of carbonate ions (i.e., the chemical balances of the above formula (2) and the above formula (3) are easily transferred to the right side, respectively). In addition, the activity of the carbon dioxide absorbent 10 is easily improved thereby. Therefore, the absorption efficiency of carbonate ions can be further improved. As the lower limit of the pH of the solution 20, from the viewpoint of increasing the amount of carbonate ions generated in the solution 20, it may be 8 or 10. On the other hand, as the upper limit of the pH of the solution 20, there is no particular limitation, and from the viewpoint of easily controlling the pH of the solution 20, it may be set to 13, for example. In addition, as the pH of the solution 20, it may be greater than 6 and less than 13, it may be greater than 8 and less than 13, or it may be greater than 10 and less than 13.

[0090] 〔Dissolution accelerator〕

[0091] As the dissolution promoter, for example, carbonic anhydrase can be cited. Carbonic anhydrase promotes the dissolution of bicarbonate ions (HCO3 - ) is generated. By including the above-mentioned dissolution promoter in the solution 20, it is easy to increase the amount of carbonate ions in the solution 20. Therefore, the absorption efficiency of carbon dioxide can be further improved.

[0092] 〔pH buffer〕

[0093] The pH buffer (buffer) suppresses the pH of the solution 20 from decreasing. Examples of the pH buffer include ammonium chloride, sodium phosphate, and the like. By including the pH buffer in the solution 20, it is easy to maintain a state in which the ratio of carbonate ions in the solution 20 is increased. Therefore, the absorption efficiency of carbon dioxide can be easily maintained.

[0094] 〔Salt〕

[0095] As salts showing alkalinity in the solution 20, that is, salts showing alkalinity when dissolved in the solution 20, there can be cited: calcium chloride hydroxide, magnesium chloride hydroxide, polyferric chloride, etc. In addition, the above-mentioned alkaline metal hydroxide (M (OH) 2) can also be used as the above-mentioned salt. By making the solution 20 contain the above-mentioned salt, the pH of the solution 20 can be easily increased. As a result, the chemical balance in the solution 20 is easily shifted in a manner that increases the ratio of carbonate ions. In addition, when the carbon dioxide absorber 10 is the above-mentioned alkaline metal oxide, it is easy to maintain the activity of the carbon dioxide absorber 10 in absorbing carbonate ions.

[0096] (Dissolution promoting mechanism)

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

[0098] As the dissolution promoting mechanism 40, for example, there can be listed a bubble generating device (bubbling device) capable of generating fine bubbles such as nanobubbles and microbubbles in the solution 20, an ultrasonic generating device capable of generating cavitation bubbles in the solution 20, and a temperature-pressure control device capable of lowering the water temperature of the solution 20 and increasing the partial pressure of carbon dioxide.

[0099] exist Figure 1 as well as Figure 2 In the embodiment, the bubble generator is provided as the dissolution promoting mechanism 40. The bubble generator is disposed in the flow path of carbon dioxide from the supply unit 30 to the storage tank 102. The bubble generator converts the gas containing carbon dioxide into fine bubbles and supplies the fine bubbles to the solution 20.

[0100] The upper limit of the bubble diameter of the above-mentioned fine bubbles can be 1.0 μm, 0.8 μm, or 0.6 μm from the viewpoint of increasing the contact area between carbon dioxide and the solution 20 as a whole of the carbon dioxide absorption module 101. On the other hand, the lower limit of the bubble diameter of the above-mentioned fine bubbles is not particularly limited, and can be set to 0.005 μm, for example. In addition, the bubble diameter of the above-mentioned fine bubbles can be greater than 0.005 μm and less than 1.0 μm, greater than 0.005 μm and less than 0.8 μm, or greater than 0.005 μm and less than 0.6 μm. In addition, the "bubble diameter" refers to the diameter at the moment of ejection from the bubble generating device.

[0101] The lower limit of the partial pressure of carbon dioxide in the gas supplied from the supply unit 30 to the storage tank 102 can be 4.0×10 -5 MPa, which can be 6.0×10 -5 MPa, or 8.0×10 -5 MPa. On the other hand, the upper limit of the partial pressure is not particularly limited, and can be set to 1.0×10 -1 MPa. In addition, the partial pressure can be 4.0×10 -5 MPa or above and 1.0×10 -1 MPa or less, can be 6.0×10 -5 MPa or above and 1.0×10 -1 MPa or less, can be 8.0×10 -5 MPa or above and 1.0×10 -1 Therefore, when the dissolution promoting mechanism 40 is the temperature and pressure control device, the dissolution promoting mechanism 40 can control the partial pressure of carbon dioxide within the above range.

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

[0103] (Decentralized Organization)

[0104] The dispersion mechanism 50 disperses the plurality of carbon dioxide absorbents 10 in the solution 20. The dispersion mechanism 50 maintains the average particle size of the plurality of carbon dioxide absorbents 10. The lower limit of the average particle size of the plurality of carbon dioxide absorbents 10 maintained by the dispersion mechanism 50 may be 5 nm, 10 nm, or 15 nm. On the other hand, the upper limit of the average particle size of the plurality of carbon dioxide absorbents 10 maintained by the dispersion mechanism 50 may be 500 nm, 200 nm, 100 nm, 50 nm, or 30 nm. In addition, the above-mentioned average particle size may 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. The carbon dioxide absorption module 101 is provided with the dispersion mechanism 50, and can easily maintain the appropriate particle size of the carbon dioxide absorbent 10 while suppressing the aggregation of the carbon dioxide absorbent 10.

[0105] The dispersion mechanism 50 functions particularly effectively when a plurality of carbon dioxide absorbers 10 are prone to agglomeration. For example, when a plurality of carbon dioxide absorbers 10 are not arranged on the support bodies 71a, 71b, and 71c, agglomeration of the carbon dioxide absorbers 10 may occur temporarily. In such a case, by dispersing the plurality of carbon dioxide absorbers 10 using the dispersion mechanism 50 when carbon dioxide is supplied to the solution 20, it is possible to easily maintain an appropriate particle size of the carbon dioxide absorber 10. In addition, when the carbon dioxide absorber 10 is arranged in the above-mentioned porous particles, by providing the dispersion mechanism 50, the above-mentioned porous particles can be dispersed in the solution 20, and the appropriate particle size of the above-mentioned porous particles can be easily maintained. Furthermore, the carbon dioxide absorption module 101 is provided with the dispersion mechanism 50, so that the entire system including the solution 20 can be homogenized, so that the carbon dioxide absorber 10 can easily absorb carbon dioxide.

[0106] As the dispersion mechanism 50, a mechanism for generating a water flow in the solution 20 can be used, for example, an ultrasonic generator, a stirring device, etc. (in Figure 1 (Figure 2 shows an ultrasonic generating device).

[0107] (Solution adjustment mechanism)

[0108] The solution adjustment mechanism 60 supplies an alkaline substance to the solution 20 when the pH of the solution 20 decreases. Examples of the alkaline substance include the salts and solutions in which the salts are dissolved. The lower limit of the pH of the solution 20 at which the solution adjustment mechanism 60 starts to supply the alkaline substance may be 5, 6, or 7. The solution adjustment mechanism 60 makes it easier to maintain a state in which the ratio of carbonate ions in the solution 20 increases. Therefore, the absorption efficiency of carbon dioxide can be more easily maintained. 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] (Show organization)

[0110] The display unit 90 displays the decrease in activity when the activity of the carbon dioxide absorbent 10 decreases. By including such a display unit 90, the carbon dioxide absorption module 101 can easily control the environment of the solution 20 so as to maintain the carbon dioxide absorption efficiency.

[0111] As described above, in the carbon dioxide absorption module 101, the pH of the solution 20 is related to the activity of the 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 the solution 20 or a pH meter capable of measuring the pH of the solution 20. By displaying the pH of the solution 20 with a pH indicator or a pH meter, a decrease in the activity of the carbon dioxide absorption material 10 can be displayed.

[0112] 〔pH indicator〕

[0113] As the pH indicator, an indicator capable of indicating a decrease in the activity of the carbon dioxide absorber 10 can be used. For example, as an indicator capable of indicating a change around pH 6, bromocresol purple, bromothymol blue (BTB), phenol red, and neutral red can be cited.

[0114] In the carbon dioxide absorption module 101, the dissolution rate of carbon dioxide in the solution 20 can be lower than the carbonation rate of the carbon dioxide absorption material 10. By configuring in this way, the carbon dioxide supplied from the supply unit 30 can be more reliably absorbed by the carbon dioxide absorption material 10. From this point of view, the upper limit of the ratio of the content [ppm] of carbon dioxide in the gas released from the solution 20 (more specifically, the gas discharged from the exhaust mechanism 103 described later) to the content [ppm] of carbon dioxide in the gas supplied from the supply unit 30 can be 0.8, 0.6, or 0.4. On the other hand, as the lower limit of the above ratio, there is no particular limitation, for example, it can be set to 0.1. In addition, as the above ratio, it can be greater than 0.1 and less than 0.8, it can be greater than 0.1 and less than 0.6, or it can be greater than 0.1 and less than 0.4.

[0115] <Carbon dioxide absorption device>

[0116] The carbon dioxide absorption device 1 includes the carbon dioxide absorption module 101 and a storage tank 102 storing a solution 20. The carbon dioxide absorption device 1 also includes an exhaust mechanism 103 for exhausting gas released from the solution 20. In the 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 , so 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 provided so that the entire carbon dioxide absorption unit 70 can be immersed in the solution 20 in a state where the solution 20 is stored.

[0120] (Exhaust mechanism)

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

[0122] [Second embodiment]

[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 unit 230 for supplying carbon dioxide to the solution 20. Figure 5 In the embodiment, the carbon dioxide absorption module 201 is disposed in the carbon dioxide absorption tower 2 .

[0124] The carbon dioxide absorption module 201 can cover the carbon dioxide absorption material with a solution 20 in which carbon dioxide is dissolved. At this time, a part of the dissolved carbon dioxide changes into carbonate ions. Therefore, the carbon dioxide absorption material can easily absorb the carbonate ions dissolved in the solution 20. Therefore, the carbon dioxide absorption module 201 has excellent carbon dioxide absorption efficiency.

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

[0126] <Carbon dioxide absorption module>

[0127] The carbon dioxide absorption module 201 covers the carbon dioxide absorption material with the solution 20 in which carbon dioxide is dissolved, so that the carbon dioxide absorption material absorbs carbonate ions generated in the solution 20. The carbon dioxide absorption module 201 includes a plurality of the carbon dioxide absorption materials. In addition, the carbon dioxide absorption module 201 includes a storage unit 240 for storing the plurality of carbon dioxide absorption materials and a spreading mechanism 250 for spreading the solution 20 to the plurality of carbon dioxide absorption materials.

[0128] (Carbon dioxide absorbing material)

[0129] As the carbon dioxide absorbing material in the carbon dioxide absorbing module 201, the same material as the carbon dioxide absorbing material 10 in the first embodiment can be used. In the carbon dioxide absorbing module 201, the carbon dioxide absorbing material can be arranged on the supports 71a, 71b, 71c in the same manner as the carbon dioxide absorbing material 10 in the first embodiment. In addition, the carbon dioxide absorbing module 201 can also include a plurality of supports 71a, 71b, 71c in the same manner as the first embodiment. The plurality of supports 71a, 71b, 71c can also be arranged at intervals from each other, and in this case, spacers can also be arranged between the supports 71a, 71b, 71c in the same manner as the first embodiment. In the carbon dioxide absorbing module 201, the plurality of carbon dioxide absorbing materials, the plurality of supports, and the spacers constitute a carbon dioxide absorbing unit as a whole.

[0130] (Solution)

[0131] The solution 20 is spread by the spreading mechanism 250, so as to continuously cover the plurality of carbon dioxide absorbers. As the solution 20 in the carbon dioxide absorption module 201, the same solution as the solution 20 in the first embodiment can be used. That is, the solution 20 may include a dissolution promoter that promotes the dissolution of carbon dioxide in the solution 20, may include a pH buffer, and may include a salt that exhibits alkalinity in the solution 20.

[0132] (Accommodation)

[0133] The container 240 is a container for containing the plurality of carbon dioxide absorbing materials. The container 240 contains the entire carbon dioxide absorbing part. The container 240 has a plurality of openings for the solution 20 to pass through. More specifically, the container 240 has a plurality of openings, which serve as a flow path for the solution 20 spread from above by the spreading mechanism 250 to cover the plurality of carbon dioxide absorbing materials and then flow out from below through the plurality of carbon dioxide absorbing materials. The carbon dioxide absorbing module 201 includes the container 240, so that the solution 20 can be easily supplied in a uniform contact manner with the plurality of carbon dioxide absorbing materials contained in predetermined positions.

[0134] (Distribution Agency)

[0135] The spreading mechanism 250 is arranged at a position above the container 240. The spreading mechanism 250 spreads the solution 20 from above to the container 240. The spreading mechanism 250 is set in a manner that the solution 20 is uniformly spread in the container 240. The carbon dioxide absorption module 201 makes the solution 20 contact with the above-mentioned plurality of carbon dioxide absorption materials uniformly through the spreading mechanism 250, thereby easily improving the absorption efficiency of carbon dioxide. Furthermore, the solution 20 spread by the spreading mechanism 250 contacts the carbon dioxide supplied from the supply unit 230 and moved to the exhaust mechanism 204 described later in the form of droplets with a large surface area. Therefore, it is easy to further improve the absorption efficiency of carbon dioxide. In addition, according to the carbon dioxide absorption module 201, the solution 20 spread by the spreading mechanism 250 does not stay in the container 240. Therefore, it is easy to control the solution 20 to an appropriate pH.

[0136] (Supply Department)

[0137] The supply unit 230 supplies the gas containing carbon dioxide to the storage unit 240. Figure 5In the embodiment, the supply unit 230 is configured to supply the gas containing carbon dioxide from below to the container 240. In more detail, the carbon dioxide absorption module 201 has a flow path in which the solution 20 spread by the spreading mechanism 250 falls downward through the container 240. The supply unit 230 supplies the gas containing carbon dioxide into the flow path from below the container 240. The supply unit 230 is configured so that the carbon dioxide supplied into the flow path dissolves in the solution 20 in the container 240. The supply unit 230 may also be configured to fill the flow path with carbon dioxide.

[0138] The supply unit 230 ejects a gas containing carbon dioxide into the flow path. The lower limit of the partial pressure of carbon dioxide in the gas supplied from the supply unit 230 may be 0.005 MPa or 0.010 MPa from the viewpoint of uniformly dissolving carbon dioxide in the solution 20 dispersed by the dispersion mechanism 250. On the other hand, the upper limit of the partial pressure may be, for example, 0.99 MPa from the viewpoint of operability of the carbon dioxide absorption module 201. In addition, the partial pressure may be 0.005 MPa or more and 0.99 MPa or 0.010 MPa or more and 0.99 MPa or less.

[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 in which the carbon dioxide absorption module 201 is arranged, an exhaust mechanism 204 for exhausting the gas in the housing 203, and a pump 205 for circulating the solution 20 flowing out of the storage part 240 to the spreading mechanism 250.

[0141] The carbon dioxide absorption tower 2 includes the carbon dioxide absorption module 201 and thus has excellent carbon dioxide absorption efficiency.

[0142] (case)

[0143] The housing 203 has a cylindrical portion extending up and down and a storage portion arranged below the above-mentioned cylindrical portion. The above-mentioned cylindrical portion is, for example, cylindrical. A spreading mechanism 250 is arranged on the upper part of the above-mentioned cylindrical portion. In addition, a receiving portion 240 is arranged at a position below the spreading mechanism 250 of the above-mentioned cylindrical portion. The receiving portion 240 is arranged in a manner of blocking the internal space of the cylindrical portion at a part of the axial direction of the above-mentioned cylindrical portion. A supply portion 230 is connected to the peripheral wall of the above-mentioned cylindrical portion below the receiving portion 240. The area below the spreading mechanism 250 in the internal space of the above-mentioned cylindrical portion constitutes a flow path of the solution 20.

[0144] The storage part is provided continuously with the lower end of the cylindrical part. The storage part stores the solution 20 which is spread by the spreading mechanism 250 and passes through the containing part 240. Carbon dioxide may be dissolved in the solution 20 stored in the storage part.

[0145] The storage part is connected to a water supply mechanism 206 and a drainage mechanism 207. The water supply mechanism 206 and the drainage mechanism 207 can supply the solution 20 to the storage part or discharge the solution 20 stored in the storage part in order to adjust the pH of the solution 20 stored in the storage part. The water supply mechanism 206 can also be set as the solution adjustment mechanism. In addition, the display mechanism can also be set in the storage part.

[0146] (Exhaust mechanism)

[0147] The exhaust mechanism 204 is arranged above the housing portion 240. The exhaust mechanism 204 is arranged, for example, at the top of the cylindrical portion.

[0148] (Pump)

[0149] The pump 205 pumps up the solution 20 stored in the storage portion and circulates the solution 20 to the spreading mechanism 250 .

[0150] [Third Embodiment]

[0151] [Carbon dioxide absorption method]

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

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

[0154] The carbon dioxide absorption method can be performed using the above-mentioned carbon dioxide absorption module 101 or carbon dioxide absorption module 201. Hereinafter, the carbon dioxide absorption method will be described in detail.

[0155] (Dissolution process)

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

[0157] In the dissolution step S1, the dissolution promoting mechanism 40 may be used to promote the dissolution of carbon dioxide in the solution 20. In addition, in the dissolution step S1, the plurality of carbon dioxide absorbers 10 may be dispersed in the solution 20 by the dispersing mechanism 50. Furthermore, in the dissolution step S1, the alkaline substance may be supplied to the solution 20 by the solution adjusting mechanism 60, and the decrease in the activity of the carbon dioxide absorber may be displayed by the display mechanism 90.

[0158] (Contact process)

[0159] In the contact step S2, carbonate ions are brought into contact with the carbon dioxide absorbing material so that the carbon dioxide absorbing material absorbs carbonate ions. In the contact step S2, for example, when the carbon dioxide absorbing module 101 described in the first embodiment is used, carbonate ions generated in the solution 20 are brought into contact with the carbon dioxide absorbing material 10 immersed in the solution 20. In addition, when the carbon dioxide absorbing module 201 described in the second embodiment is used, the solution 20 containing carbonate ions is passed through the containing part 240, so that carbonate ions are brought into contact with a plurality of carbon dioxide absorbing materials 10.

[0160] In the carbon dioxide absorption method, as a step of making the carbon dioxide absorption material absorb carbonate ions, the dissolution step S1 and the contact step S2 are performed in sequence. On the other hand, as the carbon dioxide absorption module 101, 201 as a whole, the dissolution step S1 and the contact step S2 can be performed in parallel. At this time, the dissolution rate of carbon dioxide in the solution 20 can be lower than the carbonation rate of the carbon dioxide absorption material 10.

[0161] Furthermore, the carbon dioxide absorption method may include a step of recovering the carbon dioxide absorption material that has absorbed carbonate ions (also referred to as a "recovery step") after the contact step S2.

[0162] [Other embodiments]

[0163] The embodiments disclosed this time should be considered as illustrative in all aspects and not restrictive. The scope of the present invention is not limited to the configurations involved in the above embodiments, but is indicated by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0164] The carbon dioxide absorption module may be disposed in a device other than the carbon dioxide absorption device and the carbon dioxide absorption tower described in the above embodiment.

[0165] The arrangement of the carbon dioxide absorbent is not limited to the configuration described in the above embodiment. For example, the carbon dioxide absorbent may not be arranged on the support. In addition, the carbon dioxide absorbent may be arranged on another support after being arranged on the porous particles.

[0166] The solution may contain an emulsifier (surfactant). When the solution contains an emulsifier, the emulsifier is adsorbed to the carbon dioxide absorbent to form micelles, thereby suppressing the aggregation of the carbon dioxide absorbent and easily maintaining an appropriate particle size of the carbon dioxide absorbent.

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

[0168] The lower limit of the absolute value of the Zeta potential of the micelle formed by the emulsifier may be 20 mV or 25 mV from the viewpoint of maintaining the stability of the micelle. On the other hand, the upper limit of the absolute value of the Zeta potential of the micelle is not particularly limited, and may be, for example, 40 mV. In addition, the absolute value of the Zeta potential of the micelle may be 20 mV or more and 40 mV or more and 25 mV or less.

[0169] In the above embodiment, water is used as the solvent of the solution, but the present disclosure is not limited thereto. As the above solvent, for example, an organic solvent can be used.

[0170] One or both of the dissolution promoting mechanism and the dispersion mechanism may be omitted when the carbon dioxide can be properly absorbed by the carbon dioxide absorbing material. In addition, the solution may be a structure that does not contain one or both of the dissolution promoting agent and the pH buffer. Furthermore, the carbon dioxide absorption module may not have the display mechanism and the solution adjustment mechanism as long as it can prevent the decrease in the activity of the carbon dioxide absorbing material or predict the decrease in the activity.

[0171] Example

[0172] Hereinafter, the present disclosure will be described in more detail by way of examples, but the present disclosure is not limited to the following examples.

[0173] [No.1]

[0174] A tray was placed at the bottom of the cubic reaction container, and 300 g of a powdered carbon dioxide absorbent was placed on the tray. Magnesium oxide (Tateho Chemical Industry Co., Ltd., Tateho MAG (registered trademark) #1100) was used as the carbon dioxide absorbent.

[0175] 300 g of the solution was supplied to the reaction vessel and allowed to stand. The carbon dioxide concentration (dissolved inorganic carbon concentration) of the solution was 1.83 × 10 -3 At this time, the powder of the carbon dioxide absorbent was in a state of containing the solution, but the liquid surface of the solution could not be observed, and the powder was not covered with the solution.

[0176] [No.2]

[0177] A cloth of 8 cm square as a support was impregnated with 50 g of a powdered carbon dioxide absorbent and 100 g of water. Magnesium oxide (Tateho Chemical Industry Co., Ltd., Tateho Mag (registered trademark) #1100) was used as the carbon dioxide absorbent. The cloth was then placed in a cubic reaction container.

[0178] The solution was supplied to the reaction vessel in such a manner that the cloth was completely immersed. The dissolved inorganic carbon concentration of the solution was 1.73×10 -3 mol / L. The reaction container was stirred using a bubbling device (manufactured by Marintec, product number: ASQ-50).

[0179] <Evaluation>

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

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

[0182] Description of Reference Numerals

[0183] 1: Carbon dioxide absorption device;

[0184] 2: Carbon dioxide absorption tower;

[0185] 10: Carbon dioxide absorption material;

[0186] 20: solution;

[0187] 30, 230: Supply department;

[0188] 40: dissolution promoting mechanism;

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

[0190] 60: solution adjustment mechanism;

[0191] 70: carbon dioxide absorption unit;

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

[0193] 72: spacer;

[0194] 90: display mechanism (pH indicator or pH meter);

[0195] 101, 201: carbon dioxide absorption module;

[0196] 102: storage tank;

[0197] 103, 204: exhaust mechanism;

[0198] 203: housing;

[0199] 205: Pump;

[0200] 206: Water supply agencies;

[0201] 207: Drainage mechanism;

[0202] 240: Accommodation portion;

[0203] 250: Dispersed organization.

Claims

1. A carbon dioxide absorption module, wherein: The carbon dioxide absorption module comprises: Carbon dioxide absorbing materials; solution covering the carbon dioxide absorbing material; and The supply unit supplies carbon dioxide to the solution.

2. The carbon dioxide absorption module according to claim 1, wherein: The carbon dioxide absorbing material is a layered double hydroxide, an alkaline metal oxide or an alkaline metal hydroxide.

3. The carbon dioxide absorption module according to claim 1 or 2, wherein: The carbon dioxide absorption module includes a dissolution promotion mechanism that promotes dissolution of the carbon dioxide into the solution.

4. The carbon dioxide absorption module according to any one of claims 1 to 3, wherein: The solution includes a dissolution promoter that promotes dissolution of the carbon dioxide into the solution.

5. The carbon dioxide absorption module according to any one of claims 1 to 4, wherein: The dissolution rate of the carbon dioxide in the solution is lower than the carbonation rate of the carbon dioxide absorbing material.

6. The carbon dioxide absorption module according to any one of claims 1 to 5, wherein: The carbon dioxide absorption module comprises a plurality of carbon dioxide absorption materials. The average particle size of the plurality of carbon dioxide absorbers is greater than or equal to 5 nm and less than or equal to 500 nm.

7. The carbon dioxide absorption module according to claim 6, wherein: The carbon dioxide absorption module includes a dispersion mechanism for dispersing the plurality of carbon dioxide absorption materials in the solution. The dispersion mechanism maintains an average particle size of the plurality of carbon dioxide absorbers at 5 nm or more and 500 nm or less.

8. The carbon dioxide absorption module according to any one of claims 1 to 7, wherein: The pH of the solution is greater than 6.

9. The carbon dioxide absorption module according to any one of claims 1 to 8, wherein: The solution contains a pH buffer.

10. The carbon dioxide absorption module according to any one of claims 1 to 9, wherein: The carbon dioxide absorption module includes a solution adjustment mechanism for supplying an alkaline substance to the solution.

11. The carbon dioxide absorption module according to any one of claims 1 to 10, wherein: The carbon dioxide absorption module includes a display unit that displays the decrease in activity when the activity of the carbon dioxide absorption material decreases.

12. The carbon dioxide absorption module according to any one of claims 1 to 11, wherein: The carbon dioxide absorption module comprises a plurality of carbon dioxide absorption materials. The carbon dioxide absorption module includes a spreading mechanism for spreading the solution to the plurality of carbon dioxide absorption materials.

13. The carbon dioxide absorption module according to claim 12, wherein: The carbon dioxide absorption module includes a housing for housing the plurality of carbon dioxide absorption materials.

14. The carbon dioxide absorption module according to any one of claims 1 to 13, wherein: The carbon dioxide absorption module includes a porous support body on which the carbon dioxide absorption material is arranged.

15. The carbon dioxide absorption module according to claim 14, wherein: The support is a porous particle. The average particle diameter of the porous particles in a state where the carbon dioxide absorbent is arranged is 10 mm or less.

16. The carbon dioxide absorption module according to claim 14, wherein: The support is a porous wire or a porous sheet. A plurality of the carbon dioxide absorbers are disposed on the support.

17. The carbon dioxide absorption module according to any one of claims 14 to 16, wherein: The carbon dioxide absorption module comprises a plurality of the support bodies. The plurality of supports are arranged at intervals from each other.

18. A carbon dioxide absorption tower, wherein: The carbon dioxide absorption tower includes the carbon dioxide absorption module according to any one of claims 1 to 17.

19. A carbon dioxide absorption device, wherein: The carbon dioxide absorption device comprises: A carbon dioxide absorption module as claimed in any one of claims 1 to 17; and a storage tank for storing the solution, The carbon dioxide absorbing material is immersed in the solution.

20. A method for absorbing carbon dioxide, wherein: The carbon dioxide absorption method includes a step of bringing carbonate ions into contact with a carbon dioxide absorption material covered with a solution.

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