Gas separation membrane, gas separation module, gas separation module manufacturing method, gas separation and recovery system, and gas separation and recovery method

Abstract

This gas separation membrane comprises a hollow-fibre-shaped hollow-fibre membrane in which a hollow is formed, and a separation function gel which contains a carrier that can chemically interact with acidic gas. The hollow-fibre membrane has a porous layer adjacent to the hollow, and a dense layer positioned on the outer peripheral side of the porous layer. The separation function gel is supported on the surface of the porous layer. A gas separation module comprises: the gas separation membrane; a housing which accommodates the gas separation membrane; and a partition part which divides a region in the housing into an in-membrane region that communicates with the hollow and an out-of-membrane region that does not communicate with the hollow. The housing has an in-membrane region port which communicates with the in-membrane region, and an out-of-membrane region port which communicates with the out-of-membrane region.

Description

[Technical Field]

[0001] The present invention relates to a gas separation membrane, a gas separation module, a method for manufacturing a gas separation module, a gas separation and recovery system, and a gas separation and recovery method. [Background technology]

[0002] In recent years, there has been a demand for technology to separate and capture acidic gases such as carbon dioxide. In particular, there is a strong demand for carbon neutrality, which means reducing greenhouse gas emissions to zero overall. To achieve carbon neutrality, technology to separate and capture carbon dioxide is necessary.

[0003] Patent Document 1 describes a gas separation membrane (gas separation membrane) for separating gas components such as carbon dioxide from a mixed feed gas. The gas separation membrane includes a base membrane having a large number of pores and an active separation layer. The base membrane includes a porous layer having pores and a dense layer without pores. The gas separation membrane is provided on the dense layer of the base membrane. Patent Document 1 also describes a gas separation module in which, when the base layer is made of hollow fibers, both ends of a hollow fiber bundle contained in a housing are fixed with an adhesive. This gas separation membrane is produced by impregnating the base membrane in a viscous aqueous solution, coating the surface of the base membrane with a coating liquid consisting of an aqueous solution containing a gas separating polymer that forms the active separation layer, and drying and removing the solvent in the coating liquid from the base membrane. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2018 / 043053 Summary of the Invention [Problem to be solved by the invention]

[0005] In order to separate acidic gases such as carbon dioxide using hollow fiber membranes, it is effective to improve the permeability and selectivity of the acidic gas. Increasing the membrane area of ​​the separation active layer is effective for improving the permeability and selectivity of the acidic gas. However, in the gas separation membrane described in Patent Document 1, the separation active layer is provided on a dense layer of the base membrane, so the surface area of ​​the separation active layer cannot be increased beyond the area of ​​the outer surface of the base membrane. This poses a problem in that there is a limit to the improvement in permeability and selectivity of the acidic gas.

[0006] Furthermore, in the production of the gas separation module described in Patent Document 1, the gas separation membrane must be fabricated by performing the steps of impregnating the substrate membrane with a viscous aqueous solution, applying a coating liquid to the surface of the substrate membrane, and drying the solvent in the coating liquid, and then the gas separation membrane must be incorporated into a housing, which presents a problem of complicated production.

[0007] Therefore, an object of the present invention is to provide a gas separation membrane, a gas separation module, a method for manufacturing a gas separation module, a gas separation and recovery system, and a gas separation and recovery method that can improve the permeability and selectivity of acidic gases. [Means for solving the problem]

[0008] [1] The gas separation membrane of the present invention comprises a hollow fiber membrane having a hollow fiber shape with a hollow portion formed inside, and a separation functional gel containing a carrier capable of chemically interacting with acidic gases, wherein the hollow fiber membrane has a porous layer adjacent to the hollow portion and a dense layer located on the outer periphery of the porous layer, and the separation functional gel is supported on the surface of the porous layer.

[0009] In this gas separation membrane, the separating gel is supported on the surface of the porous layer, allowing for selective separation of acidic gases. Furthermore, the porous layer adjacent to the hollow portion has open pores that open to the hollow portion, so the surface of the porous layer includes not only the inner peripheral surface of the porous layer but also the pore-forming surface that forms the open pores that open to the hollow portion. This allows the surface area of ​​the separating gel to be increased to be greater than the area of ​​the inner peripheral surface of the hollow fiber membrane. This allows for improved permeability and selectivity for acidic gases.

[0010] [2] In the gas separation membrane described in [1] above, the separation gel may be supported on the inner circumferential surface of the porous layer and on a pore-forming surface that forms open pores that open to the hollow portion. In this gas separation membrane, the separation gel is supported on the inner circumferential surface of the porous layer and on a pore-forming surface that forms open pores that open to the hollow portion, thereby improving the permeability and selectivity of acidic gases.

[0011] [3] In the gas separation membrane according to the above [1] or [2], the separation gel may cover the surface of the porous layer. In this gas separation membrane, the separation gel covers the surface of the porous layer, thereby improving the permeability and selectivity of acidic gases.

[0012] [4] In the gas separation membrane according to any one of the above [1] to [3], the carrier may be capable of chemically interacting with carbon dioxide. In this gas separation membrane, the separating functional gel contains a carrier capable of chemically interacting with carbon dioxide, so that carbon dioxide can be selectively separated.

[0013] [5] In the gas separation membrane described in [4] above, the separation factor of carbon dioxide relative to nitrogen may be 2 or more and 100,000 or less. In this gas separation membrane, the separation function gel is supported on the surface of the porous layer, so the separation factor of carbon dioxide relative to nitrogen can be increased. Furthermore, since the separation factor of carbon dioxide relative to nitrogen is 2 or more, permeation of nitrogen accompanying carbon dioxide can be suppressed. This improves the carbon dioxide separation performance. Meanwhile, since the separation factor of carbon dioxide relative to nitrogen is 100,000 or less, the gas separation membrane can be easily manufactured.

[0014] [6] In the gas separation membrane according to any one of the above [1] to [5], the carrier may be an ionic liquid. In this gas separation membrane, the ionic liquid as a carrier is contained in the separating functional gel, so that it can appropriately chemically interact with acidic gases, particularly carbon dioxide.

[0015] [7] The gas separation module of the present invention comprises a gas separation membrane according to any one of [1] to [6] above, a housing for accommodating the gas separation membrane, and a partition for dividing the area within the housing into an intra-membrane area connected to the hollow portion and an extra-membrane area not connected to the hollow portion, and the housing has an intra-membrane area port connected to the intra-membrane area and an extra-membrane area port connected to the extra-membrane area.

[0016] In this gas separation module, the region within the housing is divided into an intra-membrane region that is connected to the hollow portion and an extra-membrane region that is not connected to the hollow portion. Therefore, by supplying a target gas containing an acidic gas to either the intra-membrane region or the extra-membrane region, the acidic gas can be selectively separated from the target gas and permeated through the gas separation membrane. The housing has an intra-membrane region port that is connected to the intra-membrane region and an extra-membrane region port that is connected to the extra-membrane region. Therefore, the target gas can be supplied from either the intra-membrane region port or the extra-membrane region port, and the acidic gas can be recovered from the other of the intra-membrane region or the extra-membrane region. Furthermore, because the gas separation module includes the above-mentioned gas separation membrane, the permeability and selectivity of acidic gases can be improved.

[0017] [8] In the gas separation module described in [7] above, the intramembrane region port may have a first intramembrane region port and a second intramembrane region port located on opposite sides of the hollow portion. In this gas separation module, the intramembrane region port has a first intramembrane region port and a second intramembrane region port located on opposite sides of the hollow portion, so that a flow path passing through the intramembrane region is formed between the first intramembrane region port and the second intramembrane region port. This can improve the fluid flow in the intramembrane region.

[0018] [9] In the gas separation module described in [7] or [8] above, the extramembrane region port may have a first extramembrane region port and a second extramembrane region port spaced apart from each other. In this gas separation module, the extramembrane region port has a first extramembrane region port and a second extramembrane region port spaced apart from each other, so that a flow path passing through the extramembrane region is formed between the first extramembrane region port and the second extramembrane region port. This can improve the fluid flow in the extramembrane region.

[0019]

[10] The method for manufacturing a gas separation module of the present invention comprises a preparation step of preparing a module intermediate in which the separation functional gel is not supported on the surface of the porous layer in the gas separation module described in any one of [7] to [9] above, a supply step of supplying a gel liquid containing the carrier to the intra-membrane region of the module intermediate, a discharge step of discharging the gel liquid from the intra-membrane region, and a gel generation step of gelling the gel liquid remaining in the intra-membrane region.

[0020] In this method for producing a gas separation module, a gel liquid can be supplied to the intra-membrane region of a module intermediate, which is a gas separation module in which a separating gel is not supported on the surface of the porous layer, thereby adhering the gel liquid to the surface of the porous layer. Therefore, the gel liquid can be discharged from the intra-membrane region and the gel liquid remaining in the intra-membrane region is gelled to produce a separating gel supported on the surface of the porous layer. This makes it possible to produce a gas separation module in which a separating gel is supported on the surface of the porous layer. In other words, it is possible to produce a gas separation module that can achieve improved permeability and selectivity for acidic gases. Moreover, since the separating gel can be supported on the surface of the porous layer after producing a module intermediate in which hollow fiber membranes are housed in a housing, the gas separation module can be easily produced.

[0021]

[11] The gas separation and recovery system of the present invention comprises a gas separation module described in any one of [7] to [9] above, a target gas supply device connected to a target gas region, which is either the intra-membrane region or the extra-membrane region of the gas separation module, and supplying a target gas containing an acidic gas to the target gas region, and an acidic gas recovery device connected to a recovery region, which is the other of the intra-membrane region or the extra-membrane region of the gas separation module, and suctioning the recovery region.

[0022] In this gas separation and recovery system, the target gas is supplied to the target gas region and the recovery region is suctioned, allowing the acid gas to be selectively separated from the target gas and permeate the gas separation membrane. This allows the acid gas to be recovered from the recovery region. Furthermore, the inclusion of the gas separation membrane described above can improve the permeability and selectivity of the acid gas.

[0023]

[12] The gas separation and recovery system of the present invention comprises a first gas separation module which is a gas separation module described in any one of [7] to [9] above, and a second gas separation module which is a gas separation module described in any one of [7] to [9] above, and a target gas region which is either the intra-membrane region or the extra-membrane region of the second gas separation module is connected to a recovery region which is the other of the intra-membrane region or the extra-membrane region of the first gas separation module.

[0024] In this gas separation and recovery system, the target gas passes through the first gas separation and recovery system and the second gas separation and recovery system, thereby increasing the concentration of the recovered acid gas. Therefore, even if the acid gas separation performance of one gas separation module is insufficient, the concentration of the recovered acid gas can be sufficiently increased.

[0025]

[13] The gas separation and recovery system described in

[12] above may further include a pump disposed in a flow path connecting the recovery region of the first gas separation module and the target gas region of the second gas separation module. By providing a pump disposed in a flow path connecting the recovery region of the first gas separation module and the target gas region of the second gas separation module, this gas separation and recovery system can pressurize the gas recovered in the recovery region of the first gas separation module and supply it to the target gas region of the second gas separation module.

[0026]

[14] The gas separation and recovery system according to

[12] or

[13] above may further include a target gas supply device connected to a target gas region, which is either the intra-membrane region or the extra-membrane region of the first gas separation module, and configured to supply a target gas containing an acidic gas to the target gas region, and an acidic gas recovery device connected to a recovery region, which is the other of the intra-membrane region or the extra-membrane region of the second gas separation module, and configured to suction the recovery region. Because this gas separation and recovery system includes the target gas supply device and the acidic gas recovery device, it is possible to supply a target gas to the gas separation and recovery system and recover an acidic gas from the gas separation and recovery system without connecting any other device.

[0027]

[15] The gas separation and recovery method of the present invention is a gas separation and recovery method for separating and recovering acidic gas from a target gas containing acidic gas using the gas separation and recovery system described in

[11] or

[14] above, in which the target gas is supplied from the target gas supply device to the target gas region, and the recovery region is suctioned to recover the acidic gas from the recovery region.

[0028] In this gas separation and recovery method, in the above-mentioned gas separation and recovery system, the target gas is supplied from the target gas supply device to the target gas region, and the recovery region is suctioned to recover the acidic gas from the recovery region, thereby improving the permeability and selectivity of the acidic gas and improving the separation and recovery efficiency of the acidic gas. [Effects of the Invention]

[0029] According to the present invention, it is possible to improve the permeability and selectivity of acid gases. [Brief explanation of the drawings]

[0030] [Figure 1] 1 is a schematic cross-sectional view of a gas separation module according to an embodiment. [Figure 2] FIG. 2 is a schematic cross-sectional view taken along line II-II shown in FIG. [Figure 3] FIG. 3 is a schematic cross-sectional view taken along line III-III shown in FIG. [Figure 4] 3 is a schematic cross-sectional view showing a preparation step in a method for manufacturing a gas separation module. FIG. [Figure 5] FIG. 5 is a schematic cross-sectional view taken along line VV shown in FIG. [Figure 6] FIG. 3 is a schematic cross-sectional view showing a supplying step in the method for producing a gas separation module. [Figure 7] FIG. 7 is a schematic cross-sectional view taken along line VII-VII shown in FIG. [Figure 8] FIG. 3 is a schematic cross-sectional view showing a discharging step in the method for manufacturing a gas separation module. [Figure 9] FIG. 9 is a schematic cross-sectional view taken along line IX-IX shown in FIG. 8. [Figure 10] 1 is a schematic diagram of a gas separation and recovery system according to an embodiment. [Figure 11] FIG. 2 is an enlarged schematic cross-sectional view of a portion of the interior of the gas separation module. [Figure 12] FIG. 2 is a schematic diagram of another gas separation and recovery system according to an embodiment. [Figure 13] FIG. 10 is a schematic cross-sectional view of a modified gas separation module. [Figure 14] FIG. 10 is a schematic cross-sectional view of another modified example of a gas separation module. [Figure 15] FIG. 10 is a schematic diagram of a modified gas separation and recovery system. DETAILED DESCRIPTION OF THE INVENTION

[0031] Hereinafter, a gas separation membrane, a gas separation module, a method for manufacturing a gas separation module, a gas separation recovery system, and a gas separation recovery method according to embodiments will be described with reference to the drawings. In all drawings, the same or corresponding parts are designated by the same reference numerals, and duplicated explanations will be omitted.

[0032] [Gas separation membranes, gas separation modules] Fig. 1 is a schematic cross-sectional view of a gas separation module according to an embodiment. The gas separation module 1 shown in Fig. 1 is a module for selectively separating acidic gases from a target gas containing acidic gases.

[0033] Examples of acidic gases include carbon dioxide (CO), nitrogen oxides (NOx) such as nitric oxide and nitrogen dioxide, sulfur oxides (SOx) such as sulfur dioxide and sulfur trioxide, hydrogen sulfide, chlorine, hydrogen chloride, etc. Among these, from the viewpoint of achieving carbon neutrality, carbon dioxide is preferred as the acidic gas.

[0034] Examples of target gases include exhaust gas from power plants such as thermal power plants and biomass power plants, exhaust gas from cement factories, exhaust gas from steel mills, exhaust gas from factories such as oil refineries and chemical plants, exhaust gas from facilities related to hydrogen production and ammonia production, and natural gas.

[0035] The gas separation module 1 comprises one or more gas separation membranes 2 , a housing 3 , and a compartment 4 .

[0036] The gas separation membrane 2 is a hollow fiber membrane. The gas separation membrane 2 has the function of selectively separating acidic gases from a target gas. Selective separation of acidic gases means, for example, that the acidic gases permeate faster than gases other than acidic gases, and thus the acidic gases permeate preferentially.

[0037] The outer diameter of the gas separation membrane 2 is not particularly limited, but can be, for example, 100 μm to 3000 μm, 100 μm to 500 μm, or 100 μm to 300 μm. The inner diameter of the gas separation membrane 2 is not particularly limited, but can be, for example, 10 μm to 500 μm, 50 μm to 300 μm, or 80 μm to 200 μm. The thickness of the gas separation membrane 2 is not particularly limited, but can be, for example, 5 μm to 200 μm, 10 μm to 100 μm, or 20 μm to 50 μm.

[0038] Fig. 2 is a schematic cross-sectional view taken along line II-II in Fig. 1. As shown in Fig. 2, the gas separation membrane 2 includes a hollow fiber membrane 21 and a separating gel 22.

[0039] The hollow fiber membrane 21 is a hollow fiber-shaped membrane with a hollow portion 21a formed inside. The hollow fiber membrane 21 is a permeable membrane that allows gases such as acidic gases to pass through but does not allow liquids such as a gel liquid, which will be described later, to pass through. Examples of materials for the hollow fiber membrane 21 include polyolefin-based resins such as polypropylene, polyethylene, and polymethylpentene (PMP, also known as 4-methylpentene-1 and poly(4-methylpentene-1)), silicone-based resins such as polydimethylsiloxane and its copolymers, and fluorine-based resins such as PTFE and vinylidene fluoride.

[0040] Fig. 3 is a schematic cross-sectional view taken along the line III-III shown in Fig. 2. As shown in Figs.

[0041] The porous layer 211 is a layer adjacent to the hollow portion 21a. In other words, the porous layer 211 is located as the innermost layer of the hollow fiber membrane 21. The porous layer 211 is formed in a ring shape and forms the inner peripheral surface of the hollow fiber membrane 21.

[0042] The porous layer 211 is porous. Being porous means, for example, having a plurality of pores 211a through which the gel liquid can pass. In other words, the porous layer 211 has a plurality of pores 211a through which the gel liquid can pass. The plurality of pores 211a include a plurality of open pores 211b that open to the hollow portion 21a. The shape of the open pores 211b is not particularly limited. The open pore 211b may be, for example, a single spherical pore, a pore in which a plurality of spherical pores are connected, a single slit-shaped pore, a hole in which a plurality of slit-shaped pores are connected, or any other pore shape. The porous layer 211 is formed, for example, in a sponge-like shape. The porous layer 211 also functions as a layer that supports the dense layer 212.

[0043] The dense layer 212 is a layer located on the outer peripheral side of the porous layer 211 (on the outer peripheral surface side of the hollow fiber membrane 21). The dense layer 212 is formed in a ring shape and covers the porous layer 211 from the outer peripheral side. The dense layer 212 may be located at any position on the hollow fiber membrane 21 as long as it is located on the outer peripheral side of the porous layer 211. From the viewpoint of easily forming the dense layer 212, the dense layer 212 may be located, for example, as the outermost layer of the hollow fiber membrane 21. Note that if the dense layer 212 is not located in the outermost layer of the hollow fiber membrane 21, a layer similar to the porous layer 211 may be formed on the outer peripheral side of the dense layer 212.

[0044] The dense layer 212 is a non-porous layer that does not have any porosity. "Not having any porosity" means, for example, that it does not have any pores through which the gel liquid can pass. In other words, the dense layer 212 does not have any pores through which the gel liquid can pass. In this case, the dense layer 212 may have pores through which the gel liquid cannot pass.

[0045] The separating gel 22 is a gel containing a carrier capable of chemically interacting with acidic gases. That is, the separating gel 22 has the function of selectively separating acidic gases from target gases by chemically interacting with the acidic gases.

[0046] Examples of carriers contained in the separating functional gel 22 include ionic liquids, deep eutectic solvents (DES), which are compounds that exhibit properties similar to ionic liquids, and organic amines. Ionic liquids are salts whose molecules are designed to become liquid at room temperature. Deep eutectic solvents are compounds that are a mixture of hydrogen bond donor compounds and hydrogen bond acceptor compounds, and are compounds that become liquid at room temperature, similar to ionic liquids.

[0047] Examples of ionic liquids that can chemically interact favorably with carbon dioxide include ionic liquids containing a cation selected from ammonium cations, imidazolium cations, and phosphonium cations, and an anion selected from fluorine-containing anions, cyano group-containing anions, and anions derived from amino acids. Specifically, for example, ionic liquids that combine ammonium cations with fluorine-containing anions (e.g., [N 1114 ][TFSA], [choline][TFSA], etc.); ionic liquids combining imidazolium cations with fluorine-containing anions (e.g., [emim][TFSA], [emim][TfO], [emim][BF4], [bmim][TFSA], [bmim][Tf3C], [bmim][TfO], [bmim][BF4], [bmim][PF6], [bmim][TFA], [hmim][TFSA], [omim][TFSA], [C6H4F9mim][TFSA], etc.); ionic liquids combining imidazolium cations with cyano-containing anions (e.g., [emim][DCA], [emim][C(CN)3], [emim][B(CN)4], [bmim][DCA], [bmim][C(CN)3], [bmim][B(CN)4], etc.); ionic liquids combining phosphonium cations with amino acid-derived anions (e.g., [P 4444 ][Pro], [P 2225 ][Pro], [P 2225 These ionic liquids may be used alone or in combination of two or more.

[0048] Furthermore, examples of deep eutectic solvents that can chemically interact favorably with carbon dioxide include amide, carboxylic acid, and alcohol compounds as hydrogen bond donors, and ammonium salts and phosphonium salts as hydrogen bond acceptors. Specific examples include deep eutectic solvents made by mixing choline chloride and urea, and deep eutectic solvents made by mixing choline chloride and ethylene glycol.

[0049] The separating gel 22 is supported on the surface 211c of the porous layer 211. As described above, since the dense layer 212 is located on the outer periphery of the porous layer 211, the surface of the porous layer 211 does not exist on the outer periphery of the porous layer 211, but exists only on the inner periphery of the porous layer 211 (the hollow portion 21a side). Therefore, the surface of the porous layer 211 that leads to the hollow portion 21a is the surface 211c of the porous layer 211. The surface 211c of the porous layer 211 is composed of an inner periphery surface 211d of the porous layer 211 and a hole-forming surface 211e that forms each of the multiple open holes 211b that open to the hollow portion 21a. The inner periphery surface 211d is also the inner periphery of the hollow fiber membrane 21. The separating gel 22 is supported on the inner peripheral surface 211d of the porous layer 211 and on the hole forming surface 211e that forms each of the plurality of open holes 211b that open to the hollow portion 21a.

[0050] The separating gel 22 covers the surface 211c of the porous layer 211. It is preferable that the separating gel 22 covers the entire surface 211c of the porous layer 211, but it is not necessary that the separating gel 22 covers the entire surface 211c of the porous layer 211. The coverage of the surface 211c of the porous layer 211 by the separating gel 22 can be, for example, 50% or more, 75% or more, or 90% or more.

[0051] Incidentally, one index for separating carbon dioxide from a target gas is the separation factor α of carbon dioxide relative to nitrogen. The separation factor α can be calculated, for example, by measuring the permeation rates of carbon dioxide and nitrogen according to ASTM D-1434 and then calculating the ratio of the permeation rate of carbon dioxide to the permeation rate of nitrogen (permeation rate of carbon dioxide / permeation rate of nitrogen). When the separation factor α of the gas separation membrane 2 for carbon dioxide relative to nitrogen is greater than 1, carbon dioxide can be separated from the target gas. Furthermore, when the separation functional gel 22 is supported on the surface 211c of the porous layer 211, the separation factor α of the gas separation membrane 2 for carbon dioxide relative to nitrogen is increased. From the viewpoint of suppressing permeation of nitrogen accompanying carbon dioxide, the separation factor α of the gas separation membrane 2 for carbon dioxide relative to nitrogen may be, for example, 2 or more, 10 or more, 30 or more, or 50 or more. The upper limit of the separation factor α of the gas separation membrane 2 for carbon dioxide relative to nitrogen is the case where only carbon dioxide permeates, in which case it is infinite. From the viewpoint of facilitating the production of the gas separation membrane 2, the separation factor α of carbon dioxide relative to nitrogen of the gas separation membrane 2 may be, for example, 100,000 or less, 30,000 or less, 5,000 or less, or 1,000 or less. From these viewpoints, the separation factor α of carbon dioxide relative to nitrogen of each of the plurality of gas separation membranes 2 may be, for example, 2 or more and 100,000 or less, 10 or more and 30,000 or less, 30 or more and 5,000 or less, or 50 or more and 1,000 or less.

[0052] 1, the housing 3 is formed in a cylindrical shape and houses a plurality of gas separation membranes 2. The partition 4 divides the area inside the housing 3 into an intra-membrane area A that communicates with the hollow portion 21a and an extra-membrane area B that does not communicate with the hollow portion 21a. In other words, the area inside the housing 3 is divided into the intra-membrane area A and the extra-membrane area B by the partition 4.

[0053] The partition section 4 is composed of, for example, a first sealing section 41 that seals the gap between the housing 3 and the tip end of one side of one or more gas separation membranes 2, and a second sealing section 42 that seals the gap between the housing 3 and the tip end of the other side of one or more gas separation membranes 2. The plurality of gas separation membranes 2 are also referred to as a membrane bundle.

[0054] The first sealing portion 41 fills the entire area except for one or more gas separation membranes 2 in a cross section perpendicular to the central axis of the housing 3. In other words, the first sealing portion 41 fills the space between one end of one or more gas separation membranes 2 and the inner wall of the housing 3. When multiple gas separation membranes 2 are housed in the housing 3, the first sealing portion 41 also fills the spaces between the multiple gas separation membranes 2. The hollow portion 21a of each of the one or more gas separation membranes 2 is not sealed by the first sealing portion 41 and is open from the first sealing portion 41. The first sealing portion 41 is formed, for example, from a resin.

[0055] In a cross section perpendicular to the central axis of the housing 3, the second sealing portion 42 fills the entire area except for the one or more gas separation membranes 2. In other words, the second sealing portion 42 fills the space between the other end of the one or more gas separation membranes 2 and the inner wall of the housing 3. When the housing 3 accommodates multiple gas separation membranes 2, the second sealing portion 42 also fills the spaces between the multiple gas separation membranes 2. The hollow portion 21a of each of the one or more gas separation membranes 2 is not sealed by the second sealing portion 42 and is open from the second sealing portion 42. The second sealing portion 42 is formed, for example, from a resin.

[0056] Therefore, the hollow portions 21a of the plurality of gas separation membranes 2, the region a1 of the first sealing portion 41 opposite the second sealing portion 42, and the region a2 of the second sealing portion 42 opposite the first sealing portion 41 form the intra-membrane region A. The region outside the plurality of gas separation membranes 2 between the first sealing portion 41 and the second sealing portion 42 forms the extra-membrane region B.

[0057] The housing 3 has a first intramembrane region port 31 and a second intramembrane region port 32 that are connected to the intramembrane region A, and a first extramembrane region port 33 and a second extramembrane region port 34 that are connected to the extramembrane region B.

[0058] The first intramembrane region port 31 and the second intramembrane region port 32 are openings that open the intramembrane region A to the outside of the housing 3. The first intramembrane region port 31 and the second intramembrane region port 32 are located on opposite sides of the hollow portion 21a. For example, the first intramembrane region port 31 is located on the opposite side of the second sealing portion 42 of the first sealing portion 41 so as to be adjacent to a region a1 of the first sealing portion 41 on the opposite side of the second sealing portion 42 in the intramembrane region A. The second intramembrane region port 32 is located on the opposite side of the first sealing portion 41 of the second sealing portion 42 so as to be adjacent to a region a2 of the second sealing portion 42 on the opposite side of the first sealing portion 41 in the intramembrane region A.

[0059] The first extramembrane region port 33 and the second extramembrane region port 34 are openings that open the extramembrane region B to the outside of the housing 3. The first extramembrane region port 33 and the second extramembrane region port 34 may be located in any position, but are preferably spaced apart from each other and are preferably located so as to sandwich one or more gas separation membranes 2. For example, the first extramembrane region port 33 is located near the second sealing portion 42, and the second extramembrane region port 34 is located on the opposite side of the first extramembrane region port 33 across one or more gas separation membranes 2 near the first sealing portion 41.

[0060] [Manufacturing method of gas separation module] Next, a method for manufacturing the gas separation module will be described. This manufacturing method is a method for manufacturing the gas separation module 1 described above.

[0061] Fig. 4 is a schematic cross-sectional view showing a preparation step in a manufacturing method for a gas separation module. Fig. 5 is a schematic cross-sectional view taken along line VV in Fig. 4. As shown in Figs. 4 and 5, first, a preparation step is performed in which a module intermediate 11 is prepared. The module intermediate 11 is a gas separation module 1 in which the separating gel 22 is not supported on the surface 211c of the porous layer 211. In other words, the module intermediate 11 is the same as the gas separation module 1 described above, except that the separating gel 22 is not supported on the surface 211c of the porous layer 211. Therefore, the module intermediate 11 is a module in which a hollow fiber membrane 21 in the form of a hollow fiber with a hollow portion 21a formed inside is housed in a housing 3, and the hollow fiber membrane 21 has a porous layer 211 adjacent to the hollow portion 21a and a dense layer 212 located on the outer periphery of the porous layer 211, and the area within the housing 3 is divided by a partition portion 4 into an intra-membrane area A connected to the hollow portion 21a and an extra-membrane area B not connected to the hollow portion 21a.

[0062] FIG. 6 is a schematic cross-sectional view showing a supplying step in a manufacturing method for a gas separation module. FIG. 7 is a schematic cross-sectional view taken along line VII-VII in FIG. 6. As shown in FIGS. 6 and 7, a supplying step is then performed in which a gel liquid L containing a carrier capable of chemically interacting with acidic gas is supplied to the intramembrane region A of the module intermediate 11. The gel liquid L is a precursor of the separating functional gel, and is a liquid that becomes the separating functional gel when gelled. The gel liquid L is also called a sol. The gel liquid L contains, for example, a carrier and a hydrophilic cross-linked polymer such as polyethylene glycol, polypropylene glycol, polyamine, polyethyleneimine, polyvinyl alcohol, polyacrylic acid, polyacrylamide, gelatin, polyglutamic acid, or polyaspartic acid. These hydrophilic cross-linked polymers may be used alone or in combination or copolymerized form. In the supply step, for example, the gel liquid L is caused to flow from the first intra-membrane region port 31 to the second intra-membrane region port 32 so that the intra-membrane region A is filled with the gel liquid L.

[0063] FIG. 8 is a schematic cross-sectional view showing the discharge step in the manufacturing method of a gas separation module. FIG. 9 is a schematic cross-sectional view taken along line IX-IX in FIG. 8. As shown in FIGS. 8 and 9, next, a discharge step is performed in which the gel liquid L is discharged from the intra-membrane region A. In the discharge step, the supply of the gel liquid L to the intra-membrane region A is stopped, and the gel liquid filling the intra-membrane region A is discharged from the second intra-membrane region port 32. At this time, a portion of the gel liquid L remains in the intra-membrane region A and is supported on the surface 211c of the porous layer 211. The gel liquid L may be discharged from the second intra-membrane region port 32 by gravity, by being pushed out by a pressure device (not shown), or by being suctioned by a suction device (not shown).

[0064] Next, a gel generation step is performed to gel the gel liquid L remaining in the intra-membrane region A. Gelation may be performed, for example, by drying the gel liquid L to volatilize the solvent contained in the gel liquid L, by heating the gel liquid L to promote crosslinking of the gel liquid L, or by UV irradiation if crosslinking of the gel liquid L is achieved by UV irradiation. By gelling the gel liquid L, a separating gel 22 is generated that is supported on the surface 211c of the porous layer 211. In this way, the gas separation module 1 is manufactured.

[0065] [Gas separation and recovery system] Fig. 10 is a schematic diagram of a gas separation and recovery system according to an embodiment. The gas separation and recovery system 101A shown in Fig. 10 is a system for selectively separating an acidic gas AG from a target gas TG. The gas separation and recovery system 101A includes the above-described gas separation module 1, a target gas supply device 102, and an acidic gas recovery device 103.

[0066] The target gas supply device 102 is a device that is connected to the intra-membrane region A of the gas separation module 1 and supplies the target gas TG to the intra-membrane region A. The target gas supply device 102 has, for example, a compressor 104 that compresses and sends out the target gas TG, and by operating this compressor 104, the target gas TG can be compressed and supplied to the gas separation module 1.

[0067] The target gas supply device 102 is connected to the first intra-membrane region port 31 of the gas separation module 1 via a target gas supply path 105. The target gas supply path 105 is formed of a tubular member such as a pipe. The target gas supply device 102 is connected to the target gas supply path 105 and is thereby connected to the intra-membrane region A. Therefore, the target gas TG sent out from the target gas supply device 102 is supplied to the intra-membrane region A of the gas separation module 1 through the target gas supply path 105. In addition, the target gas TG supplied to the intra-membrane region A is discharged from the second intra-membrane region port 32 to the outside of the gas separation and recovery system 101A.

[0068] A target gas discharge path 106 is connected to the second intra-membrane region port 32 for discharging the target gas TG from the intra-membrane region A. Ideally, the gas discharged from the target gas discharge path 106 is a gas from which acidic gases have been completely removed, but in reality, it is a target gas with a reduced concentration of acidic gases. For convenience, in this specification, not only the target gas supplied to the gas separation module 1 but also the target gas whose acidic gas concentration has been reduced by the gas separation module 1 will be described as the target gas TG. The target gas discharge path 106 is formed, for example, by a tubular member such as a pipe. A flow control valve 107 is attached to the target gas discharge path 106 to adjust (limit) the flow rate of the target gas TG so that the target gas TG is maintained at a high pressure in the intra-membrane region A.

[0069] The acidic gas recovery apparatus 103 is a device that is connected to the extra-membrane region B of the gas separation module 1, sucks the extra-membrane region B, and recovers the acidic gas AG from the extra-membrane region B. Ideally, the gas recovered by the acidic gas recovery apparatus 103 is only acidic gas, but in reality, it is a target gas with an increased concentration of acidic gas. For convenience, in this specification, not only acidic gas but also target gas with an increased concentration of acidic gas by the gas separation module 1 will be described as the acidic gas AG. The acidic gas recovery apparatus 103 has a suction device 108 such as a vacuum pump, and by operating this suction device 108, it is possible to suck the extra-membrane region B and recover the acidic gas from the extra-membrane region B. By suctioning the extra-membrane region B, the extra-membrane region B is put into a reduced pressure state, and the acidic gas contained in the target gas TG in the intra-membrane region A permeates the gas separation membrane 2 and moves to the extra-membrane region B.

[0070] The acidic gas recovery device 103 is connected to the second extra-membrane region port 34 of the gas separation module 1 via an acidic gas recovery line 109. The acidic gas recovery line 109 is formed, for example, by a tubular member such as a pipe. The acidic gas recovery device 103 is connected to the acidic gas recovery line 109 and is thereby in communication with the extra-membrane region B. Therefore, the suction force of the suction device 108 acts on the extra-membrane region B of the gas separation module 1 through the acidic gas recovery line 109. In addition, the acidic gas that has permeated the gas separation membrane 2 is discharged outside the gas separation and recovery system 101A through the acidic gas recovery line 109 and recovered in the acidic gas recovery device 103.

[0071] The first extra-membrane region port 33 is closed. However, in order to facilitate the discharge of the acid gas AG from the extra-membrane region B, a carrier gas supply device (not shown) for supplying a carrier gas (sweep gas) such as helium or argon to the extra-membrane region B may be connected to the first extra-membrane region port 33.

[0072] In the gas separation and recovery system 101A, the intra-membrane region A is a target gas region to which the target gas TG is supplied, and the extra-membrane region B is a recovery region to which the acid gas AG is sucked and recovered.

[0073] [Gas separation and recovery method] Next, a gas separation and recovery method will be described. This gas separation and recovery method is a method for separating and recovering an acid gas AG from a target gas TG using a gas separation and recovery system 101A shown in FIG.

[0074] As shown in Figures 1 and 10, first, the target gas TG is supplied from the target gas supply device 102 to the intra-membrane region A. That is, by operating the compressor 104 of the target gas supply device 102, the target gas TG is compressed and supplied to the intra-membrane region A from the target gas supply channel 105 and the first intra-membrane region port 31. At this time, it is preferable to adjust the flow rate of the target gas TG in the target gas discharge channel 106 using the flow control valve 107 so that the target gas TG is maintained at high pressure in the intra-membrane region A. In addition, the extra-membrane region B is suctioned by the acidic gas recovery device 103. That is, by operating the suction device 108, gas is sent from the gas separation module 1 side to the opposite side of the gas separation module 1 in the acidic gas recovery channel 109, and the extra-membrane region B is suctioned.

[0075] Then, in the gas separation module 1, as shown in FIG. 11, the acidic gas AG contained in the target gas TG supplied to the intra-membrane region A chemically interacts with the separation functional gel 22 and permeates the gas separation membrane 2. FIG. 11 is a schematic cross-sectional view enlarging a portion of the interior of the gas separation module. As a result, some or all of the acidic gas AG is separated from the target gas TG. The target gas TG from which the acidic gas AG has been separated is discharged from the intra-membrane region A to the target gas discharge channel 106. Meanwhile, the acidic gas AG separated from the target gas TG and permeating the gas separation membrane 2 is discharged from the extra-membrane region B to the acidic gas recovery channel 109. The acidic gas AG is then recovered through the acidic gas recovery channel 109.

[0076] [Other gas separation and recovery systems] Fig. 12 is a schematic diagram of another gas separation and recovery system according to an embodiment. The gas separation and recovery system 101B shown in Fig. 11 is basically the same as the gas separation and recovery system 101A shown in Fig. 10, but differs from the gas separation and recovery system 101A in that the extra-membrane region B is a target gas region to which the target gas TG is supplied, and the intra-membrane region A is a recovery region to which the acidic gas AG is sucked and recovered. Therefore, only the differences from the gas separation and recovery system 101A will be described below, and explanations similar to those of the gas separation and recovery system 101A will be omitted.

[0077] The gas separation and recovery system 101B includes the above-described gas separation module 1, a target gas supply device 102, and an acidic gas recovery device 103.

[0078] The target gas supply device 102 is connected to the first extra-membrane region port 33 of the gas separation module 1 by a target gas supply path 105, and is in communication with the extra-membrane region B. That is, the target gas supply device 102 supplies the target gas TG to the extra-membrane region B.

[0079] A target gas discharge channel 106 is connected to the second extramembrane region port 34. A flow rate adjustment valve 107 is attached to the target gas discharge channel 106.

[0080] The acidic gas recovery device 103 is connected to the first intra-membrane region port 31 of the gas separation module 1 by an acidic gas recovery line 109 and is in communication with the intra-membrane region A. In other words, the acidic gas recovery device 103 suctions the intra-membrane region A and recovers acidic gases from the intra-membrane region A.

[0081] The second intra-membrane region port 32 is closed. However, in order to facilitate the discharge of the acid gas AG from the intra-membrane region A, a carrier gas supply device (not shown) that supplies a carrier gas to the intra-membrane region A may be connected to the second intra-membrane region port 32.

[0082] [Other gas separation and recovery methods] Next, another gas separation and recovery method will be described. This gas separation and recovery method is a method for separating and recovering an acid gas AG from a target gas TG using a gas separation and recovery system 101B shown in FIG.

[0083] As shown in Figures 1 and 12, first, the target gas TG is supplied from the target gas supply device 102 to the extra-membrane region B. That is, by operating the compressor 104 of the target gas supply device 102, the target gas TG is compressed and supplied to the extra-membrane region B from the target gas supply channel 105 and the first extra-membrane region port 33. At this time, it is preferable to adjust the flow rate of the target gas TG in the target gas discharge channel 106 using the flow control valve 107 so that the target gas TG is maintained at high pressure in the extra-membrane region B. In addition, the intra-membrane region A is suctioned by the acidic gas recovery device 103. That is, by operating the suction device 108, gas is sent from the gas separation module 1 side to the opposite side of the gas separation module 1 in the acidic gas recovery channel 109, and the intra-membrane region A is suctioned.

[0084] Then, in the gas separation module 1, the acidic gas AG contained in the target gas TG supplied to the extra-membrane region B chemically interacts with the separation functional gel 22 and permeates the gas separation membrane 2. As a result, part or all of the acidic gas AG is separated from the target gas TG. The target gas TG from which the acidic gas AG has been separated is then discharged from the extra-membrane region B to the target gas discharge channel 106. Meanwhile, the acidic gas AG separated from the target gas TG and permeating the gas separation membrane 2 is discharged from the intra-membrane region A to the acidic gas recovery channel 109. The acidic gas is then recovered through the acidic gas recovery channel 109.

[0085] As described above, in the gas separation membrane 2 according to this embodiment, the separating gel 22 is supported on the surface 211c of the porous layer 211, and therefore, the acidic gases AG can be selectively separated. Furthermore, the porous layer 211 adjacent to the hollow portion 21a has open pores 211b that open to the hollow portion 21a, and therefore the surface 211c of the porous layer 211 includes not only the inner circumferential surface 211d of the porous layer 211 but also the pore-forming surface 211e that forms the open pores 211b that open to the hollow portion 21a. Therefore, the surface area of ​​the separating gel 22 can be increased to be equal to or greater than the area of ​​the inner circumferential surface of the hollow fiber membrane 21. This allows for improved permeability and selectivity for the acidic gases AG.

[0086] Furthermore, in this gas separation membrane 2, the separation functional gel 22 is supported on the inner surface 211d of the porous layer 211 and the pore forming surface 211e that forms the open pores 211b that open to the hollow portion 21a, thereby improving the permeability and selectivity of the acidic gas AG.

[0087] Furthermore, in this gas separation membrane 2, the separation functional gel 22 covers the surface 211c of the porous layer 211, and therefore, the permeability and selectivity of the acidic gas AG can be improved.

[0088] Furthermore, in this gas separation membrane 2, the separating functional gel 22 contains a carrier capable of chemically interacting with carbon dioxide, so that carbon dioxide can be selectively separated.

[0089] Furthermore, in this gas separation membrane 2, the separation function gel 22 is supported on the surface 211c of the porous layer 211, so the separation coefficient α of carbon dioxide relative to nitrogen can be increased. Furthermore, since the separation coefficient α of carbon dioxide relative to nitrogen is 2 or more, 10 or more, 30 or more, or 50 or more, permeation of nitrogen accompanying carbon dioxide can be suppressed. This improves the carbon dioxide separation performance. Meanwhile, since the separation coefficient α of carbon dioxide relative to nitrogen is 100,000 or less, 30,000 or less, 5,000 or less, or 1,000 or less, the gas separation membrane 2 can be easily manufactured.

[0090] Furthermore, in this gas separation membrane 2, the ionic liquid that serves as a carrier is contained in the separating functional gel 22, so that it can appropriately chemically interact with acidic gases, particularly carbon dioxide.

[0091] In the gas separation module 1 according to this embodiment, the region within the housing 3 is divided into an intra-membrane region A, which is connected to the hollow portion 21a, and an extra-membrane region B, which is not connected to the hollow portion 21a. Therefore, by supplying a target gas TG containing an acidic gas AG to either the intra-membrane region A or the extra-membrane region B, the acidic gas AG can be selectively separated from the target gas TG and permeated through the gas separation membrane 2. The housing 3 has a first intra-membrane region port 31 and a second intra-membrane region port 32, which are connected to the intra-membrane region A, and a first extra-membrane region port 33 and a second extra-membrane region port 34, which are connected to the extra-membrane region B. Therefore, the target gas TG can be supplied to either of these ports, and the acidic gas AG can be recovered from either of these ports. Furthermore, since the gas separation module 1 includes the gas separation membrane 2 described above, the permeability and selectivity of the acidic gas AG can be improved.

[0092] Furthermore, in this gas separation module 1, the first intra-membrane region port 31 and the second intra-membrane region port are located on opposite sides of the hollow portion 21a, so that a flow path passing through the intra-membrane region A is formed between the first intra-membrane region port 31 and the second intra-membrane region port 32. This allows for improved fluid flow in the intra-membrane region A.

[0093] Furthermore, in this gas separation module 1, the first extramembrane region port 33 and the second extramembrane region port 34 are spaced apart from each other, so that a flow path passing through the extramembrane region B is formed between the first extramembrane region port 33 and the second extramembrane region port 34. This allows for improved fluid flow in the extramembrane region B.

[0094] In the method for producing a gas separation module according to this embodiment, the gel liquid L is supplied to the intra-membrane region A of the module intermediate 11, which is a gas separation module 1 in which the separating gel 22 is not supported on the surface 211c of the porous layer 211, thereby allowing the gel liquid L to adhere to the surface 211c of the porous layer 211. Therefore, the gel liquid L is discharged from the intra-membrane region A, and the gel liquid L remaining in the intra-membrane region A is gelled, thereby producing the separating gel 22 supported on the surface 211c of the porous layer 211. This allows the production of a gas separation module 1 in which the separating gel 22 is supported on the surface 211c of the porous layer 211. This means that the gas separation module 1 can be produced with improved permeability and selectivity for acidic gases AG. Furthermore, the gas separation module 1 can be easily produced because the separating gel 22 can be supported on the surface 211c of the porous layer 211 after the module intermediate 11 in which the hollow fiber membranes 21 are housed in the housing 3 is produced.

[0095] In the gas separation and recovery system 101A according to this embodiment, the target gas TG is supplied to the intra-membrane region A, which is the target gas region, and the extra-membrane region B, which is the recovery region, is suctioned, thereby allowing the acidic gas AG to be selectively separated from the target gas TG and permeate the gas separation membrane 2. This allows the acidic gas AG to be recovered from the extra-membrane region B. Moreover, since the gas separation membrane 2 described above is provided, the permeability and selectivity of the acidic gas AG can be improved.

[0096] In another gas separation and recovery system 101B according to this embodiment, the target gas TG is supplied to the extra-membrane region B, which is the target gas region, and the intra-membrane region A, which is the recovery region, is suctioned, thereby allowing the acidic gas AG to be selectively separated from the target gas TG and permeate the gas separation membrane 2. This allows the acidic gas AG to be recovered from the intra-membrane region A. Moreover, since the system is equipped with the above-described gas separation membrane 2, it is possible to improve the permeability and selectivity of the acidic gas AG.

[0097] In the gas separation and recovery method of this embodiment, in the above-mentioned gas separation and recovery system 101A or gas separation and recovery system 101B, the target gas TG is supplied from the target gas supply device 102 to a target gas region, which is either the intra-membrane region A or the extra-membrane region B, and the recovery region, which is the other of the intra-membrane region A or the extra-membrane region B, is suctioned to recover the acidic gas AG from the recovery region, thereby improving the permeability and selectivity of the acidic gas AG and improving the separation and recovery efficiency of the acidic gas AG.

[0098] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments.

[0099] For example, in the above-described gas separation and recovery system 101A, one of the two ports communicating with the extra-membrane region of the gas separation module 1 is blocked and does not function. Therefore, for example, as in the gas separation module 1A shown in Figure 13, only one port may be connected to the extra-membrane region B. In the gas separation module 1A shown in Figure 13, only one extra-membrane region port 35 is formed in the housing 3 as a port communicating with the extra-membrane region B.

[0100] Furthermore, in the above-described gas separation module 1, the housing is described as having two intramembrane region ports communicating with the intramembrane region and two extramembrane region ports communicating with the extramembrane region. However, as long as the target gas can be supplied and the acidic gas can be recovered, and further, the gel solution can be supplied and discharged, only one intramembrane region port communicating with the intramembrane region and only one extramembrane region port communicating with the extramembrane region may be formed, as in the gas separation module 1B shown in FIG. 14. In the gas separation module 1B shown in FIG. 14, only one intramembrane region port 36 is formed in the housing 3 as a port communicating with the intramembrane region A, and only one extramembrane region port 37 is formed as a port communicating with the extramembrane region B. In this case, the second sealing portion 42 may also be filled in the hollow portion 21a of each of one or more gas separation membranes 2. In addition, in manufacturing a gas separation module, from the viewpoint of suitably adhering a gel liquid to the surface of the porous layer, it is preferable to have two intra-membrane region ports connected to the intra-membrane region, as shown in Figure 13, located on opposite sides of the hollow portion 21a of the gas separation membrane 2.

[0101] Furthermore, the above-mentioned gas separation and recovery system 101A and gas separation and recovery system 101B have been described as systems using one gas separation module 1. However, the gas separation and recovery system may be a system in which multiple gas separation modules are connected in series, such as gas separation and recovery system 101C shown in FIG. 15. FIG. 15 is a schematic diagram of a modified gas separation and recovery system. The gas separation and recovery system 101C shown in FIG. 15 is provided with multiple gas separation and recovery systems 101A shown in FIG. 10, and multiple gas separation modules 1 are connected in series. Connecting multiple gas separation modules 1 in series means that the multiple gas separation modules 1 are connected so that the target gas TG flows through the multiple gas separation modules 1 in series. 15, the acidic gas recovery apparatus 103 of the first-stage gas separation and recovery system 101A and the target gas supply apparatus 102 of the second-stage gas separation and recovery system 101A are combined, and the acidic gas recovery apparatus 103 of the second-stage gas separation and recovery system 101A and the target gas supply apparatus 102 of the third-stage gas separation and recovery system 101A are combined. When the acidic gas recovery apparatus 103 of the front-stage (upstream) gas separation and recovery system 101A and the target gas supply apparatus 102 of the rear-stage (downstream) gas separation and recovery system 101A are combined, they may be configured with a single pump. That is, a pump may be disposed in a flow path connecting the recovery region (either intra-membrane region A or extra-membrane region B) of the preceding (upstream) gas separation module 1 (first gas separation module) with the target gas region (either intra-membrane region A or extra-membrane region B) of the following (downstream) gas separation module 1 (second gas separation module). The pump is a device that pressurizes and pumps out the supplied gas, and may be, for example, a device similar to compressor 104 or suction device 108.

[0102] In the gas separation and recovery system 101C configured in this manner, the concentration of the recovered acid gas AG is increased each time the target gas TG passes through each stage of the gas separation and recovery system 101A. Therefore, even if the separation performance of the acid gas AG is insufficient in one gas separation module 1, the concentration of the recovered acid gas AG can be sufficiently increased.

[0103] 15 shows, as an example, three gas separation and recovery systems 101A connected, but two gas separation and recovery systems 101A may be connected, or four or more gas separation and recovery systems 101A may be connected. Also, in FIG. 15, as an example, a plurality of gas separation and recovery systems 101A are connected, but a plurality of gas separation and recovery systems 101B may be connected, or a plurality of other gas separation and recovery systems (not shown) may be connected, or a plurality of mutually different gas separation and recovery systems (not shown) may be connected. [Explanation of symbols]

[0104] 1...gas separation module, 1A...gas separation module, 1B...gas separation module, 2...gas separation membrane, 3...housing, 4...compartment, 11...module intermediate, 21...hollow fiber membrane, 21a...hollow portion, 211...porous layer, 211a...hole, 211b...open hole, 211c...surface, 211d...inner peripheral surface, 211e...pore-forming surface, 212...dense layer, 22...separating functional gel, 31...first intra-membrane region port, 32...second intra-membrane region port, 33...first extra-membrane region port, 34...second extra-membrane region port, 35...extra-membrane region port, 36...intra-membrane region port, 37...extramembrane region port, 41...first sealing portion, 42...second sealing portion, 101A...gas separation and recovery system, 101B...gas separation and recovery system, 102...target gas supply device, 103...acid gas recovery device, 104...compressor, 105...target gas supply path, 106...target gas discharge path, 107...flow control valve, 108...suction device, 109...acid gas recovery path, A...intramembrane region (target gas region, recovery region), a1...region, a2...region, B...extramembrane region (recovery region, target gas region), TG...target gas, AG...acid gas, L...gel liquid.

Claims

1. a hollow fiber membrane having a hollow fiber shape with a hollow portion formed inside; a separating functional gel containing a carrier capable of chemically interacting with an acid gas; The hollow fiber membrane is a porous layer adjacent to the hollow portion; a dense layer located on the outer periphery of the porous layer, The separating gel is supported on an inner peripheral surface of the porous layer, which is the surface of the porous layer, and on a pore forming surface that forms open pores that open to the hollow portion. Gas separation membrane.

2. The hollow fiber membrane comprises a polyolefin resin, a silicone resin, or a fluorine resin. The gas separation membrane of claim 1.

3. The separating gel covers the surface of the porous layer. The gas separation membrane of claim 1.

4. The carrier is capable of chemically interacting with carbon dioxide. The gas separation membrane of claim 1.

5. The separation factor of carbon dioxide relative to nitrogen is 2 or more and 100,000 or less. The gas separation membrane according to claim 4.

6. The carrier is an ionic liquid. The gas separation membrane of claim 1.

7. The gas separation membrane according to any one of claims 1 to 6, a housing that accommodates the gas separation membrane; a partition that divides the area within the housing into an intra-membrane area that is in communication with the hollow portion and an extra-membrane area that is not in communication with the hollow portion, The housing includes: an intramembrane region port communicating with the intramembrane region; and an extramembranous region port communicating with the extramembranous region. Gas separation module.

8. The intramembrane region port has a first intramembrane region port and a second intramembrane region port located on opposite sides of the hollow portion. The gas separation module of claim 7.

9. The extramembrane region port has a first extramembrane region port and a second extramembrane region port spaced apart from each other. The gas separation module of claim 7.

10. a preparation step of preparing a module intermediate in which the separating gel is not supported on the surface of the porous layer in the gas separation module according to claim 7; a supplying step of supplying a gel liquid containing the carrier to the intramembrane region of the module intermediate; a discharge step of discharging the gel liquid from the intramembrane region; a gel generating step of gelling the gel liquid remaining in the intramembrane region, In the supplying step, the gel liquid is circulated through the intramembrane region. A method for manufacturing a gas separation module.

11. The gas separation module of claim 7; a target gas supply device that is connected to a target gas region, which is either the intra-membrane region or the extra-membrane region of the gas separation module, and that supplies a target gas containing an acidic gas to the target gas region; an acidic gas recovery device that is connected to a recovery region that is the other of the intramembrane region or the extramembrane region of the gas separation module and suctions the recovery region; Gas separation and recovery system.

12. a first gas separation module, which is the gas separation module of claim 7; a second gas separation module, which is the gas separation module of claim 7; a target gas region, which is either the intra-membrane region or the extra-membrane region of the second gas separation module, and a recovery region, which is the other of the intra-membrane region or the extra-membrane region of the first gas separation module, are connected to each other; Gas separation and recovery system.

13. a pump disposed in a flow path communicating between the recovery region of the first gas separation module and the target gas region of the second gas separation module; The gas separation and recovery system according to claim 12.

14. a target gas supply device that is connected to a target gas region, which is either the intra-membrane region or the extra-membrane region of the first gas separation module, and that supplies a target gas containing an acidic gas to the target gas region; and an acidic gas recovery device that is connected to a recovery region, which is the other of the intra-membrane region or the extra-membrane region, of the second gas separation module and suctions the recovery region. The gas separation and recovery system according to claim 12.

15. A gas separation and recovery method for separating and recovering an acidic gas from a target gas containing the acidic gas using the gas separation and recovery system according to claim 11, supplying the target gas from the target gas supply device to the target gas region; applying suction to the capture region and recovering the acid gas from the capture region; Gas separation and recovery method.

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