WO2015107820A1

WO2015107820A1 - Spiral module for separating acidic gas and manufacturing method

Info

Publication number: WO2015107820A1
Application number: PCT/JP2014/083112
Authority: WO
Inventors: 米山　聡
Original assignee: 富士フイルム株式会社
Priority date: 2014-01-20
Filing date: 2014-12-15
Publication date: 2015-07-23
Also published as: JP2015136634A

Abstract

Provided are a spiral module for separating acidic gas that is capable of supplying moisture to the whole acidic gas separating membrane and is able to improve the source gas processing efficiency, that is, acidic gas separation performance, and a manufacturing method therefor. A spiral module for separating acidic gas is obtained by winding one or more laminates, which comprise a gas supply channel member that serves as a flow channel for the source gas, an acidic gas-separating layer with an acidic gas-separating membrane for separating acidic gas from the source gas, and a permeating gas channel member that serves as a flow channel for the separated acidic gas, on a center tube. The inlet end face of the gas supply channel member that serves as an inlet for the source gas has two or more flow channel-modifying members for modifying the source gas flow channel. The distance between at least one pair of flow channel-modifying members increases as distance from the inlet end face increases.

Description

Spiral type module for acid gas separation and manufacturing method

The present invention relates to an acidic gas separation module that selectively separates acidic gas from raw material gas and a method for manufacturing the same.

In recent years, development of technology for selectively separating acidic gases such as carbon dioxide from raw material gas (treated gas) has been progressing. For example, an acidic gas separation module that separates an acidic gas from a raw material gas using an acidic gas separation membrane that selectively permeates the acidic gas has been developed.

As an example, in Patent Document 1, a laminated body including an acidic gas separation membrane is multiplexed in a central tube (a central permeate collecting tube) for collecting separated acidic gas having a through-hole formed in a tube wall. A wound acid gas separation module is disclosed.
The acid gas separation module disclosed in Patent Document 1 is a dissolution diffusion type acid gas separation module using a so-called dissolution diffusion membrane as the acid gas separation membrane. The dissolution diffusion membrane separates the acid gas from the raw material gas by utilizing the difference in solubility between the acidic gas and the substance to be separated in the membrane and the diffusivity in the membrane.

In Patent Document 2, the space is divided into a raw material chamber and a permeation chamber by an acidic gas separation membrane, and a raw material gas (a mixed gas composed of CO ₂ , H _2, and H ₂ O) is supplied to the raw material chamber. An acidic gas separation module (experimental apparatus) is disclosed that extracts acidic gas selectively separated (permeated) by a gas separation membrane from a permeation chamber.
The acidic gas separation module disclosed in Patent Document 2 is a facilitated transport type acidic gas separation module using a so-called facilitated transport membrane as the acidic gas separation membrane. The facilitated transport membrane has a carrier that reacts with the acid gas in the membrane, and the acidic gas is separated from the source gas by transporting the acidic gas to the opposite side of the membrane by the carrier.

In such an acidic gas separation module, as shown in Patent Document 1, a laminate having an acidic gas separation membrane is wound around a central cylinder for collecting the separated acidic gas (wound around the central cylinder). A so-called spiral acid gas separation module is known. The spiral type acidic gas separation module can increase the area of the acidic gas separation membrane. Therefore, the spiral type acidic gas separation module can be efficiently processed.

JP-A-4-215824 Japanese Patent No. 4621295

As shown in Patent Document 1, such a spiral acidic gas separation module is generally provided with a supply gas channel member (supply spacer) whose inside is a source gas channel, and In many cases, a permeate gas channel member (permeate spacer) that is a separated acid gas channel is used. Such a flow path member is usually composed of a mesh-like sheet.
In this case, as shown in Patent Document 1, as an example, the acidic gas separation module sandwiches the supply gas flow path member with the acidic gas separation membrane and sandwiches both surfaces thereof with the permeate gas flow path member. The laminated body formed is wound around a central cylinder.

Incidentally, in the facilitated transport film, it is necessary to retain a large amount of moisture in the film in order to sufficiently function the carrier. That is, the more moisture held in the film, the higher the solubility of the carrier in the film and the higher the acid gas permeability. Therefore, water is supplied to the facilitated transport film by adding water vapor to the source gas.
When such a facilitated transport membrane is evaluated as a general batch type flat membrane, water vapor can be supplied to the entire membrane area. Therefore, ideal separation performance can be obtained.

However, according to the study of the present inventor, when such a facilitated transport membrane is used as a spiral separation module, there is a problem that the separation performance is lower than when the facilitated transport membrane is evaluated as a flat membrane. I found out.
One of the main factors is the flow velocity distribution in the separation module of the supplied source gas. The flow velocity is slower at the periphery of the central cylinder and the outer periphery of the separation module, or at the end surface side serving as the source gas outlet than the end surface side serving as the source gas inlet (see FIG. 11). It was found that the performance of the facilitated transport membrane could not be fully exploited because the amount of water supplied per unit time decreased in the portion where the flow rate was slow. That is, when the facilitated transport membrane is used as a spiral type separation module, there is a problem in that most of the facilitated transport membrane on the membrane surface is depleted of water and the performance that can be originally expressed cannot be fully exhibited. all right.

Therefore, the present invention provides a spiral-type module for acidic gas separation that can supply moisture to the entire acidic gas separation membrane and improve the processing efficiency of the raw material gas, that is, the separation performance of the acidic gas, and a method for manufacturing the same. .

As a result of earnest research to achieve the above-mentioned problems, the inventor of the present application changes the flow path of the source gas to the inlet end side serving as the inlet of the source gas of the supply gas path member of the laminate. By having a configuration in which the gap between the members of the two or more flow path changing members increases in the direction perpendicular to the inlet end side as the distance from the inlet end side increases, the acidic gas separation is performed. It has been found that moisture can be supplied to the entire membrane and the processing efficiency of the raw material gas, that is, the separation performance of the acidic gas can be improved, and the present invention has been completed.
That is, this invention provides the spiral type module for acidic gas separation of the following structures, and its manufacturing method.

(1) A central tube having a through-hole formed in the tube wall, a supply gas channel member serving as a source gas channel, and an acid gas separation for separating the acid gas from the source gas flowing through the supply gas channel member An acidic gas separation layer having a membrane on the surface on the supply gas flow path member side, and a permeate gas flow path member serving as a flow path through which the acidic gas that has permeated the acidic gas separation membrane flows to the central cylinder A spiral-type module for acid gas separation, in which one or more laminates each having a gas flow path member, an acid gas separation layer, and a permeate gas flow path member are wound around a central cylinder, The passage member has two or more flow path changing members for changing the flow path of the source gas on the inlet end face side serving as the inlet of the source gas, and as the distance from the inlet end face increases in a direction perpendicular to the inlet end face. At least one pair of two or more flow path changing members Spiral module for acid gas separation that increases the gap between them.
(2) The spiral gas module for acidic gas separation according to (1), wherein the acidic gas separation membrane is a facilitated transport membrane containing a carrier that reacts with acidic gas and a hydrophilic compound for supporting the carrier.
(3) The acid gas separation according to (1) or (2), wherein the two or more flow path changing members are arranged symmetrically about the center line in the extending direction of the inlet end face of the supply gas flow path member. Spiral type module.
(4) A plurality of sets of flow path changing members are arranged in a direction perpendicular to the inlet end face, and as the distance from the inlet end face increases in the direction perpendicular to the inlet end face, the gaps between the flow path changing members forming the set increase. The spiral gas module for acid gas separation according to any one of (1) to (3).
(5) There are two sets of flow path changing members arranged symmetrically around the center line in the extending direction of the inlet end surface of the supply gas flow path member, and one set of flow path changing members The spiral gas separation module for acid gas separation according to any one of (1) to (3), which is disposed closer to the center line than the pair of flow path changing members.
(6) The length of the two or more flow path changing members is 10% or more of the length of the supply gas flow path member in the direction perpendicular to the inlet end face, according to any one of (1) to (5) Spiral type module for acid gas separation.
(7) The acidic gas separation spiral-type module according to any one of (1) to (6), which includes two or more laminates, and the arrangement positions of the two or more flow path changing members are different for each laminate.
(8) The acidic gas separation spiral-type module according to any one of (1) to (7), which has two or more laminates, and each laminate has a different shape of the two or more flow path changing members.

(9) A method for producing a spiral-type module for acid gas separation according to any one of (1) to (8), wherein a first solution that is a material for two or more flow path changing members is diluted with a solvent. Impregnating the second solution with the formation position of the two or more flow path changing members of the supply gas flow path member, and impregnating the first solution at the position impregnated with the second solution. A method for producing a spiral-type module for separating acidic gas.
(10) A method for producing the acid gas separation spiral module according to any one of (1) to (8), wherein the step of forming two or more flow path changing members on the surface of the acid gas separation membrane; A method for producing a spiral-type module for acid gas separation, comprising a step of laminating an acid gas separation layer formed with two or more flow path changing members and a supply gas flow path member.

According to the present invention, moisture can be supplied to the entire acidic gas separation membrane, and the raw material gas processing efficiency, that is, the acidic gas separation performance can be improved.

It is a schematic perspective view which cuts off an example of the spiral type module for acidic gas separation of this invention, and partially shows it. It is a schematic sectional drawing of the laminated body of the spiral type module for acidic gas separation shown in FIG. 3 (A) to 3 (C) are diagrams conceptually showing an example of a supply gas flow path member used in the acidic gas separation spiral module of the present invention. It is a schematic perspective view for demonstrating the effect | action of a flow-path change member. FIG. 5A and FIG. 5B are conceptual diagrams for explaining an example of a method for forming a flow path changing member. 6 (A) and 6 (B) are conceptual diagrams for explaining a method of producing the acidic gas separating spiral module shown in FIG. It is a conceptual diagram for demonstrating the manufacturing method of the spiral type module for acidic gas separation shown in FIG. 8 (A) and 8 (B) are conceptual diagrams for explaining a method of manufacturing the spiral module for acid gas separation shown in FIG. It is a conceptual diagram for demonstrating the manufacturing method of the spiral type module for acidic gas separation shown in FIG. It is a conceptual diagram for demonstrating the manufacturing method of the spiral type module for acidic gas separation shown in FIG. It is a conceptual diagram for demonstrating the flow velocity distribution of the conventional spiral type separation module.

Hereinafter, the spiral-type module for acid gas separation according to the present invention will be described in detail based on a preferred embodiment shown in the accompanying drawings.
The description of the constituent elements described below may be made based on typical embodiments of the present invention, but the present invention is not limited to such embodiments.
In this specification, a numerical range expressed using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.

FIG. 1 is a partially cutaway schematic perspective view of an example of a spiral-type module for acid gas separation according to the present invention.
As shown in FIG. 1, the spiral type module 10 for acid gas separation basically includes a center tube 12, a laminate 14 having an acid gas separation membrane (facilitated transport membrane 20a), and a telescope prevention plate 16. It is configured. In the following description, the spiral module for acid gas separation is also simply referred to as a separation module.
The separation module 10 separates carbon dioxide as an acidic gas Gc from a raw material gas G containing, for example, carbon monoxide, carbon dioxide (CO ₂ ), water (water vapor), and hydrogen.

The separation module 10 of the present invention is a so-called spiral type separation module. That is, in the separation module 10, one or a plurality of sheet-like laminates 14 are laminated and wound around the center tube 12, and the center tube 12 is inserted into both end surfaces of the wound product of the laminate 14. Thus, the telescope prevention plate 16 is provided. The outermost peripheral surface of the wound laminate 14 is covered with a gas impermeable coating layer 18.

In the following description, a wound product of a product obtained by laminating a plurality of laminates 14 wound around the central cylinder 12 (that is, a substantially cylindrical product by the laminate 14 wound by being laminated) For convenience, it is also referred to as a spiral laminate 14a.

In the separation module 10 shown in FIG. 1, the source gas G from which the acidic gas is separated is supplied to the end surface of the spiral laminate 14a through, for example, the telescope prevention plate 16 (the opening 16d) on the far side in FIG. Then, the acid gas Gc is separated while flowing into the laminate 14 from the end face and flowing through the laminate 14.
Further, the acidic gas Gc separated from the raw material gas G by the stacked body 14 is discharged from the central cylinder 12. On the other hand, the source gas G from which the acidic gas has been separated (hereinafter referred to as the residual gas Gr for convenience) is discharged from the end face on the opposite side to the supply side of the spiral laminated body 14a (laminated body 14) to prevent telescoping. It is discharged out of the separation module 10 through the plate 16 (same as above).

The central cylinder (permeate gas collecting pipe) 12 is a cylindrical pipe whose end face on the source gas G supply side is closed, and a plurality of through holes 12a are formed on the peripheral surface (tube wall).
The acidic gas Gc separated from the raw material gas G passes through a permeating gas passage member 26 described later, reaches the inside of the central cylinder 12 from the through hole 12a, and is discharged from the open end 12b of the central cylinder 12.

In the center tube 12, the aperture ratio (area ratio of the through-hole 12 a occupying the outer peripheral surface of the center tube 12) in a region sealed with the adhesive layer 30 described later is preferably 1.5 to 80%, and preferably 3 to 75. % Is more preferable, and 5 to 70% is more preferable. Among these, from the practical viewpoint, the opening ratio of the center tube 12 is particularly preferably 5 to 25%.
By setting the aperture ratio of the center tube 12 within the above range, the acid gas Gc can be efficiently collected, and the strength of the center tube 12 can be increased to ensure sufficient processability.

The through hole 12a is preferably a circular hole having a diameter of 0.5 to 20 mm. Furthermore, it is preferable that the through holes 12 a are formed uniformly on the peripheral wall of the central cylinder 12.

In addition, you may provide the supply port (supply part) which supplies the gas (sweep gas) for flowing the isolate | separated acidic gas Gc to the open end 12b side in the center cylinder 12 as needed.

The laminate 14 is formed by laminating an acidic gas separation layer 20, a supply gas flow path member 24, and a permeate gas flow path member 26.
In FIG. 1, reference numeral 30 denotes an acid gas Gc in the permeate gas flow path member 26 while the acid gas separation layer 20 and the permeate gas flow path member 26 are bonded together and the laminates 14 are bonded together. This is an adhesive layer 30 in which the flow path is formed in an envelope shape opened on the center tube 12 side.

As described above, the separation module 10 in the illustrated example is formed by laminating a plurality of the laminates 14 and winding (wrapping) them around the central cylinder 12 to form a substantially cylindrical spiral laminate 14a. It has a configuration.
Here, in the present invention, for convenience, the supply direction of the source gas G is the x direction, and the direction orthogonal to the x direction is the y direction. In the separation module 10 of the illustrated example that is a spiral type, the winding direction of the laminated body 14 coincides with the y direction. It coincides with a certain x direction.

In the separation module 10, the laminate 14 may be a single layer. However, as shown in the illustrated example, by laminating a plurality of laminated bodies 14, the membrane area of the acidic gas separation layer 20 can be increased, and the amount of the acidic gas Gc separated by one module can be improved.
The number of stacked layers 14 may be appropriately set according to the processing speed and processing amount required for the separation module 10, the size of the separation module 10, and the like. Here, the number of laminated bodies 14 to be laminated is preferably 50 or less, more preferably 45 or less, and particularly preferably 40 or less. By setting the number of laminated bodies 14 to be this number, winding of the laminated body 14 around the central cylinder 12 becomes easy, and workability can be improved.

In FIG. 2, the fragmentary sectional view of the laminated body 14 is shown. As described above, the arrow x is the supply direction of the raw material gas G, and the y direction orthogonal to the x direction coincides with the winding direction of the laminate 14 (hereinafter also referred to as the winding direction).
In the illustrated example, the laminated body 14 has a supply gas flow path member 24 sandwiched between two folded acid gas separation layers 20 to form a sandwiched body 36 (see FIG. 7). The road member 26 is laminated. This configuration will be described in detail later.

As described above, in the separation module 10, the source gas G is supplied from one end face of the spiral laminated body 14 a through the telescope prevention plate 16. That is, the source gas G is supplied to the end portions (end surfaces) of the stacked bodies 14.
As conceptually shown in FIG. 2, the source gas G supplied to the end face in the x direction of the stacked body 14 flows in the supply gas flow path member 24 in the x direction. Here, in the separation module 10 of the present invention, the supply gas flow path member 24 has flow path changing members (flow

path walls

50a and 50b) that change the flow path of the source gas G flowing inside. Therefore, the flow velocity of the source gas G in the supply gas flow path member 24 can be made uniform. This will be described in detail later.
The acidic gas Gc in contact with the acidic gas separation layer 20 (facilitated transport membrane 20a) in the flow in the supply gas flow path member 24 is separated from the raw material gas G, and the acidic gas separation layer 20 is separated from the laminate 14. In the laminating direction (transported in the laminating direction by the carrier of the facilitated transport film 20a) and flows into the permeating gas channel member 26.

The acidic gas Gc that has flowed into the permeate gas flow path member 26 flows in the permeate gas flow path member 26 in the winding direction (the direction of the arrow y), reaches the central cylinder 12, and is centered from the through hole 12 a of the central cylinder 12. It flows into the cylinder 12. The acidic gas Gc flowing into the central cylinder 12 flows through the central cylinder 12 in the x direction and is discharged from the open end 12b.
Further, the residual gas Gr from which the acidic gas Gc has been removed flows in the supply gas flow path member 24 in the x direction, and is discharged from the opposite end face of the spiral laminated body 14a. 16d) and discharged to the outside of the separation module 10.

The supply gas flow path member 24 is a sheet-like member that is supplied with the source gas G from the end in the x direction and that contacts the source gas G flowing in the member with the acidic gas separation layer 20. In the illustrated example, the supply gas flow path member 24 is rectangular as an example. Further, as described above, the supply gas flow path member 24 is provided therein with a flow path changing member that changes (forcibly changes) the flow path of the source gas G.
Such a supply gas flow path member 24 functions as a spacer of the acid gas separation layer 20 folded in half as described above, and constitutes a flow path for the source gas G. Further, the supply gas flow path member 24 preferably makes the source gas G turbulent. Considering this point, the supply gas flow path member 24 is preferably a member having a mesh shape (net shape / mesh structure).

As a material for forming the supply gas flow path member 24, various materials can be used as long as they have sufficient heat resistance and moisture resistance.
Examples include paper materials such as paper, fine paper, coated paper, cast coated paper, and synthetic paper, resin materials such as cellulose, polyester, polyolefin, polyamide, polyimide, polysulfone, aramid, and polycarbonate, and inorganic materials such as metal, glass, and ceramics. A material etc. are illustrated suitably.
Specific examples of the resin material include polyethylene, polystyrene, polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE), polyethersulfone (PES), polyphenylene sulfide (PPS), polysulfone (PSF), and polypropylene (PP). , Polyimide, polyetherimide, polyetheretherketone, polyvinylidene fluoride and the like are preferably exemplified.

The thickness of the supply gas flow path member 24 may be appropriately determined according to the supply amount of the source gas G, the required processing capacity, and the like.
Specifically, 100 to 1000 μm is preferable, 150 to 950 μm is more preferable, and 200 to 900 μm is particularly preferable.

Here, in the separation module 10 of the present invention, a flow path changing member that changes the flow path of the source gas G is provided inside the supply gas flow path member 24.

FIG. 3A conceptually shows the supply gas flow path member 24 in a state in which the winding is rewound and planarized. 3A to 3C, the mesh of the supply gas flow path member 24 is omitted in order to simplify the drawing and clearly show the configuration.
As shown in FIG. 3A, the supply gas flow path member 24 has

flow path walls

50a and 50b as flow path regulating members therein. Both of the

flow path walls

50a and 50b have a height corresponding to the entire region in the thickness direction of the supply gas flow path member 24, and extend in the surface direction of the supply gas flow path member 24. It is a member.
The flow path wall (flow path regulating member) may be lower than the entire area in the thickness direction of the supply gas flow path member 24. However, it is preferable that the flow path wall has a height that blocks the entire region of the supply gas flow path member 24 in the thickness direction in that the flow path of more source gas G can be changed.

In the illustrated example, the flow path wall 50a is formed in the supply gas flow path member 24 from the end face (hereinafter also referred to as the inlet end face) serving as the inlet of the source gas in the x direction (source gas supply direction). It is inclined in a direction away from the center tube 12 in the rotation direction, and extends toward the downstream side in the x direction (hereinafter also simply referred to as upstream / downstream). On the other hand, the flow path wall 50b is provided on the central tube 12 side in the y direction with respect to the flow path wall 50a. The flow path wall 50b is inclined from the inlet end face toward the central tube 12 side in the y direction and extends in the x direction toward the downstream side. Further, both the flow path walls are formed so as not to reach the entire area in the x direction and the y direction. Further, the

flow path walls

50a and 50b are arranged substantially symmetrically about the center line in the y direction.
That is, the two

flow path walls

50a and 50b are arranged on the inlet end face side, and are arranged so that the gap between the flow path wall 50a and the flow path wall 50b increases as the distance from the inlet end face in the x direction increases. Is done.
In the following description, for convenience, the center tube 12 side in the y direction is also referred to as a base end, and the opposite side of the center tube 12 is also referred to as a tip end. Further, the end surface opposite to the entrance end surface in the x direction is also referred to as the exit end surface.

In the example shown in FIG. 3A, each of the flow channel wall 50a and the flow channel wall 50b has a shape in which the tips of three linear (plate-shaped) members are connected at different angles, that is, refraction. It is a bent line shape. However, the shape of the flow path wall 50a and the flow path wall 50b is not limited to this, and a straight line can be used as long as the gap between the flow path wall 50a and the flow path wall 50b increases as the distance from the inlet end surface increases. It may be a shape such as a shape or a curve.

In addition, the code | symbol 52 in a figure is a wall-shaped member (wall member 52) similar to the flow-path wall 50a etc. formed in the whole area of a x direction in the front-end | tip of the member 24 for supply gas flow paths.
As will be described later, since the separation module 10 has a configuration in which a plurality of stacked bodies 14 are stacked and wound, the raw material gas G flowing into one supply gas flow path member 24 is basically supplied to the separation module 10. There is no discharge from the front end side of the gas flow path member 24. However, since the raw material gas G may be discharged from the front end side of the supply gas flow path member 24 even with a small amount, the raw material gas G can be more reliably provided by having the wall member 52 as shown in the illustrated example. Can be prevented from being discharged from the front end side of the supply gas flow path member 24, and the raw material gas can be processed more efficiently.

As described above, in the conventional spiral separation module, there is a region where the flow rate of the raw material gas is slow. For this reason, in the region where the flow rate is low, the amount of water supplied to the facilitated transport membrane per unit time is reduced, and there is a problem that the performance of the facilitated transport membrane cannot be fully achieved.
Specifically, the flow velocity distribution of the raw material gas G in the supply gas flow path member 24 without the

flow path walls

50a and 50b will be described with reference to FIG.
FIG. 11 is a conceptual diagram showing the flow velocity distribution of the source gas G in the supply gas flow path member in a conventional spiral type separation module in a planar shape.
As conceptually shown in FIG. 11, in the conventional spiral type separation module, the flow velocity of the raw material gas G flowing into the supply gas flow path member 124 from the inlet end face is high on the inlet end face side, and on the outlet end face side. It gets lower as you go. Further, the flow rate of the raw material gas is low near the center tube 112 and near the coating layer. That is, in the y direction, it is high at the center and low at the base end and the tip side (on the side of the center tube and the side opposite to the center tube).
Thus, in the region where the flow rate of the raw material gas is slow, the water vapor contained in the raw material gas is not sufficiently supplied to the facilitated transport membrane, so that the amount of water supplied to the facilitated transport membrane per unit time decreases, There was a problem that performance could not be fully exploited.
By increasing the water absorption of the facilitated transport film, the dependency on the amount of supplied water can be reduced. However, if the water absorption of the facilitated transport film is increased, it becomes a very soft (low viscosity) gel film, so that defects are likely to occur due to rubbing or the like. Therefore, there is a limit to increasing the water absorption and water retention of the facilitated transport film.

In contrast, in the separation module 10 of the present invention, the supply gas flow path member 24 has the

flow path walls

50a and 50b. The

flow path walls

50a and 50b change the flow path of the raw material gas G flowing into the supply gas flow path member 24 to reduce the flow rate difference of the raw material gas G for each position of the supply gas flow path member 24. The flow velocity distribution can be made uniform over the entire surface of the supply gas flow path member 24.

Specifically, as conceptually shown in FIG. 4, in the source gas G that has flowed into the supply gas flow path member 24 from the inlet end surface, the central portion, that is, the flow path wall 50 a and the flow path wall 50 b. Since the raw material gas G flowing in between flows in the flow path expanding toward the outlet end face, the flow velocity becomes slow while flowing between the flow path wall 50a and the flow path wall 50b.
On the other hand, since the source gas G that has flowed in between the flow path wall 50a and the front end in the y direction and between the flow path wall 50b and the y direction base end flows through the flow path shrinking toward the outlet end face, The flow velocity increases while flowing between the flow path wall 50a and the distal end and between the flow path wall 50b and the proximal end.
That is, the flow rate decreases at the center in the y direction where the flow rate of the raw material gas G is fast, and the flow rate increases at the distal end side and the proximal end side where the flow rate is slow. Thereby, the flow velocity difference of the source gas G for each position of the supply gas flow path member 24 can be reduced, and the flow velocity distribution can be made uniform over the entire surface of the supply gas flow path member 24.

As described above, in the facilitated transport film, the more moisture retained in the film, the higher the solubility of the carrier in the film and the higher the acid gas permeability.
Therefore, in the separation module of the present invention having the

flow path walls

50a and 50b, the flow rate difference of the source gas G for each position of the supply gas flow path member 24 is reduced, so that the entire surface on the membrane surface of the facilitated transport film 20a. Furthermore, the raw material gas G, that is, water vapor can be supplied uniformly, and the processing efficiency of the raw material gas, that is, the separation performance of the acidic gas can be improved by effectively utilizing the entire surface of the facilitated transport film 20a.

The supply gas flow path member 24 shown in FIG. 3 (A) has two flow path walls. However, in the separation module of the present invention, there may be three or more flow path walls.

Further, the supply gas flow path member 24 may have a plurality of sets of flow path walls, with two flow path walls as one set.
For example, as conceptually shown in FIG. 3B, the supply gas flow path member 24 may have two sets of flow path walls in the x direction therein. The

flow path walls

50c and 50d have the same shape as the

flow path walls

50a and 50b, respectively, and are formed closer to the outlet end face in the x direction than the

flow path walls

50a and 50b.

Alternatively, the supply gas flow path member 24 may have two or more flow path walls in the y direction.
Further, when a plurality of sets of flow path walls are provided, the shape of each flow path wall such as the length in the x direction may be different.

In addition, the supply gas flow path member 24 may have a plurality of sets of flow path walls with the center position in the y direction coincided with each other.
For example, as conceptually shown in FIG. 3 (C), the supply gas flow path member 24 may have two sets of flow path walls with the center position in the y direction coincided with each other. The illustrated example has two sets of flow path walls, flow

path walls

50a and 50b and flow

path walls

50e and 50f. The channel wall 50e is formed on the tip side of the channel wall 50a. Further, the flow path wall 50f is formed on the proximal end side with respect to the flow path wall 50b. The flow path wall 50e and the flow path wall 50f are longer in the x direction than the flow path wall 50a and the flow path wall 50b. As shown in the figure, the flow path wall 50e and the flow path wall 50f are formed in an S shape.
In addition, by making the length of the flow path walls disposed on the distal end side and the proximal end side of the supply gas flow path member longer than the flow path wall disposed on the center side, both ends on the outlet side where the source gas is difficult to reach The raw material gas can be more suitably supplied to the section.
In this way, by arranging a plurality of sets of flow path walls on the supply gas flow path member or changing the shape of each flow path wall according to the arrangement position, the source gas in the supply gas flow path member Can be made more uniform.

The shape (length, curvature, angle, etc.), arrangement position, number, etc. of the flow path wall are not limited to the above example, but depending on the flow velocity distribution of the source gas in the supply gas flow path member 24. What is necessary is just to determine suitably.
In addition, in the case of having three or more flow path walls, the distance between at least one pair of flow path walls only needs to increase in the flow direction, and the flow path walls have a relationship in which the distance between the flow path walls decreases in the flow direction. You may have.

Here, as described above, the spiral separation module 10 has a configuration in which one or more sheet-like laminates 14 are laminated and wound around the central cylinder 12. In the case of having a plurality of laminated bodies 14, a flow path wall may be disposed in each of the supply gas flow path members 24 of each laminated body 14.
Further, in the case of having a plurality of laminates 14 and disposing a flow path wall in each supply gas flow path member 24 of each laminate 14, the size, length, A shape such as a curvature, an arrangement position, an interval between flow path walls, and an average angle formed by a pair of flow path walls may be different.
In the case of having a plurality of laminated bodies 14, the positions of the laminated bodies 14 are shifted and wound. Therefore, the flow velocity distribution in the supply gas flow path member 24 is different for each laminate 14. Therefore, for example, depending on the position of the laminated body 14 at the time of winding, for each laminated body 14, the shape, the arrangement position, the interval between the flow path walls, the size, the length, the curvature and the like of the flow path wall, and You may change the average angle etc. which the flow-path wall used as a group makes.

In the separation module 10 of the present invention, the length of the

flow path walls

50a and 50b in the x direction depends on the flow velocity distribution, flow rate and temperature of the supplied raw material gas G, the position and area of the supply gas flow path member 24, etc. Accordingly, it may be determined appropriately.
The length of the

flow path walls

50a and 50b in the x direction is 10 times the length of the supply gas flow path member 24 in the x direction in that the flow velocity distribution in the supply gas flow path member 24 can be more preferably uniformized. % Or more is preferable, 10% to 90% is more preferable, and 30% to 60% is particularly preferable.

In the separation module 10 of the present invention, the thickness of the flow path wall is appropriately determined according to the flow velocity distribution, flow rate and temperature of the supplied raw material gas G, the arrangement position, area, etc. of the supply gas flow path member 24. do it.
Here, if the thickness of the flow path wall is too thin, the strength of the flow path wall may be insufficient and may be damaged during use. Moreover, since the acidic gas separation layer 20 (facilitated transport membrane 20a) cannot be used effectively at the position where the flow path wall exists, if the flow path wall is too thick, the processing efficiency of the raw material gas G is lowered. End up.
Considering this point, the thickness of the flow path wall is preferably 5 to 50 mm, more preferably 5 to 30 mm, and particularly preferably 5 to 20 mm.

Further, in the separation module 10 of the present invention, the formation area of the flow path wall (flow path changing member) in the surface direction of the supply gas flow path member 24 depends on the performance of the facilitated transport film 20a and the flow rate of the supplied raw material gas G. What is necessary is just to determine suitably according to distribution, flow volume, temperature, etc.
Here, if the formation area of the flow path wall is too small, the effect of forming the flow path wall cannot be sufficiently obtained, and if the formation area of the flow path wall is too large, Processing efficiency is lowered.
In consideration of this point, the formation area (area B) of the flow path wall is preferably 0.01 to 10% of the area (area A) of the supply gas flow path member 24 (that is, “0.01 ≦ (( B / A) × 100 ≦ 10 ”is preferred.

In the example shown in FIG. 3A, the flow path wall (flow path changing member) is disposed at a position extending from the inlet end surface of the supply gas flow path member 24, but is not limited thereto. For example, you may arrange | position in the position which does not contact the inlet-end surface of the member 24 for supply gas flow paths.
However, the flow path changing member extends in the x direction from the inlet end face of the supply gas flow path member 24 as shown in the example in that the flow rate of the raw material gas G can be made more uniform. A wall shape is preferred.

The forming material of the flow path wall (flow path changing member) has various heat resistance and moisture resistance, and can form a wall-shaped member inside the mesh-shaped supply gas flow path member 24. Material is available.
As an example, an adhesive, a thermoplastic resin, an adhesive tape, etc. are illustrated.
Among these, various known adhesives are suitably used in terms of the formability and convenience of the flow path wall, the degree of freedom of the flow path wall width, and the like.

Examples of adhesives include epoxy resins, vinyl chloride copolymers, vinyl chloride-vinyl acetate copolymers, vinyl chloride-vinylidene chloride copolymers, vinyl chloride-acrylonitrile copolymers, butadiene-acrylonitrile copolymers, Polyamide resin, polyvinyl butyral, polyester, cellulose derivative (nitrocellulose, etc.), styrene-butadiene copolymer, various synthetic rubber resins, phenol resin, urea resin, melamine resin, phenoxy resin, silicone resin, urea formamide resin, etc. Preferably exemplified.
Especially, an epoxy resin is illustrated more suitably from a heat resistant and moisture resistant viewpoint.

As a method of forming the flow path wall in the supply gas flow path member, for example, when the flow path wall is formed of an adhesive or a thermoplastic resin, the flow path wall is formed of an adhesive or a thermoplastic resin solution. It can be formed by impregnating and curing a mesh-shaped supply gas flow path member.
5A and 5B are schematic perspective views for explaining an example of a method for forming a flow path wall.
First, a solution (first solution) of the adhesive or thermoplastic resin that is a material for forming the flow path wall is prepared, and further, a solution (second solution) obtained by diluting the first solution with a solvent is prepared. To do.
Next, as shown in FIG. 5 (A), the prepared second solution is impregnated in a predetermined position in the mesh-shaped supply gas flow path member 24 by using the cap 60a.

Further, as shown in FIG. 5B, before the

second solutions

62a and 62b impregnated in the supply gas flow path member 24 are dried, the prepared first solution is obtained using the base 60b. The

second solutions

62a and 62b are impregnated. That is, the first solution is further dissolved in the second solution in the supply gas flow path member 24.
Thereafter, the

second solutions

62a and 62b are dried and cured to form the

flow path walls

50a and 50b.

In this manner, the first solution that is the material of the

flow path walls

50a and 50b is diluted with a solvent to prepare a second solution having a low viscosity, impregnated with the second solution, and further the first solution. By impregnating the solution, the solution can be impregnated in the entire thickness direction of the supply gas flow path member 24, and a flow path wall free from defects or the like can be formed.

Here, the solvent for diluting the first solution is not particularly limited, and various known solvents used as solvents for the adhesive or thermoplastic resin solution such as acetone, MEK, methanol, hexane and the like. Is available.
The viscosity of the second solution is not particularly limited as long as it can be suitably impregnated in the supply gas flow path member 24, and the mesh diameter, thickness, porosity, and affinity with the solvent of the supply gas flow path member 24 are not limited. What is necessary is just to determine suitably by sex etc.

In addition, the formation method of the

flow path walls

50a and 50b in the supply gas flow path member 24 is not limited to this. For example, the supply gas flow path member 24 may be directly impregnated with the adhesive or thermoplastic resin solution (first solution) which is a material for forming the

flow path walls

50a and 50b.

The method for forming the

flow path walls

50a, 50b by impregnating the supply gas flow path member 24 with the adhesive or the thermoplastic resin solution is not limited.
For example, the

flow path walls

50a and 50b are formed directly on the acidic gas separation layer 20 (facilitated transport film 20a), and the acidic gas separation layer 20 and the supply gas flow path member formed with the flow path walls 50a and 50b. 24 may be laminated.
As a method of directly forming the

flow path walls

50a and 50b on the acidic gas separation layer 20 (facilitated transport film 20a), a method of installing a sheet-like material such as an adhesive tape, a solution of the above-mentioned adhesive or thermoplastic resin is used. A method of applying and curing on the acid gas separation layer 20 can be used.

Such a supply gas flow path member 24 is sandwiched between the acidic gas separation layers 20. In the illustrated example, the acid gas separation layer 20 is, for example, a rectangular sheet.
The separation module 10 in the illustrated example is a facilitated transport type as a preferred embodiment. Therefore, the acidic gas separation layer 20 is composed of a facilitated transport film 20a and a porous support 20b.
The present invention is not limited to the facilitated transport type separation module, and may be a dissolution / diffusion type separation module using a dissolution / diffusion membrane as disclosed in Patent Document 1 described above.

The facilitated transport film 20a contains at least a carrier that reacts with the acidic gas Gc contained in the source gas G flowing through the supply gas flow path member 24, and a hydrophilic compound that supports the carrier. Such a facilitated transport film 20a has a function of selectively permeating the acidic gas Gc from the source gas G (a function of selectively transporting the acidic gas Gc).
The facilitated transport type separation module is required to be used at high temperature and high humidity. Therefore, the facilitated transport film 20a has a function of selectively allowing the acidic gas Gc to permeate even at high temperatures (for example, 100 to 200 ° C.). Moreover, even if the source gas G contains water vapor, the hydrophilic compound absorbs water vapor and the facilitated transport film 20a retains moisture, so that the carrier can more easily transport the acidic gas Gc. Compared with the case, the separation efficiency is increased.

The membrane area of the facilitated transport membrane 20a may be set as appropriate according to the size of the separation module 10, the processing capacity required for the separation module 10, and the like. Specifically, 0.01 to 1000 m ² is preferable, 0.02 to 750 m ² is more preferable, and 0.025 m to 500 m ² is more preferable. In particular, the membrane area of the facilitated transport film 20a is particularly preferably 1 to 100 m ² from a practical viewpoint.
By setting the membrane area of the facilitated transport membrane 20a within the above range, the acidic gas Gc can be efficiently separated with respect to the membrane area, and the processability is also improved.

The length of the facilitated transport film 20a in the winding direction (the total length before folding in half) may be set as appropriate according to the size of the separation module 10, the processing capacity required for the separation module 10, and the like. Specifically, 100 to 10000 mm is preferable, 150 to 9000 mm is more preferable, and 200 to 8000 mm is even more preferable. In particular, the length of the facilitated transport film 20a is particularly preferably 800 to 4000 mm from a practical viewpoint.
By setting the length of the facilitated transport film 20a in the winding direction within the above range, the acidic gas Gc can be efficiently separated with respect to the film area, and further, the winding shift when the laminate 14 is wound. Is suppressed, and the processability becomes easy.
The width of the facilitated transport film may be set as appropriate according to the size of the separation module 10 in the x direction.

The thickness of the facilitated transport film 20a may be appropriately set according to the size of the separation module 10, the processing capability required for the separation module 10, and the like. Specifically, it is preferably 1 to 200 μm, more preferably 2 to 175 μm.
By setting the thickness of the facilitated transport membrane 20a within the above range, sufficient gas permeability and separation selectivity can be realized.

The hydrophilic compound functions as a binder, retains moisture in the facilitated transport film 20a, and exhibits a function of separating a gas such as carbon dioxide by the carrier. Moreover, it is preferable that a hydrophilic compound has a crosslinked structure from a heat resistant viewpoint.
Examples of such hydrophilic compounds include hydrophilic polymers.

From the viewpoint that the hydrophilic compound can be dissolved in water to form a coating solution, and the facilitated transport film 20a preferably has high hydrophilicity (moisturizing property), those having high hydrophilicity are preferable.
Specifically, the hydrophilic compound preferably has a hydrophilicity of 0.5 g / g or more, more preferably 1 g / g or more, more preferably 5 g / g of the physiological saline. More preferably, it has a hydrophilicity of g or more, particularly preferably has a hydrophilicity of 10 g / g or more, and most preferably has a hydrophilicity of 20 g / g or more.

What is necessary is just to select the weight average molecular weight of a hydrophilic compound suitably in the range which can form a stable film | membrane. Specifically, 20,000 to 2,000,000 is preferable, 25,000 to 2,000,000 is more preferable, and 30,000 to 2,000,000 is particularly preferable.
By setting the weight average molecular weight of the hydrophilic compound to 20,000 or more, the facilitated transport film 20a having a stable and sufficient film strength can be obtained.
In particular, when the hydrophilic compound has —OH as a crosslinkable group, the hydrophilic compound preferably has a weight average molecular weight of 30,000 or more. In this case, the weight average molecular weight is more preferably 40,000 or more, and more preferably 50,000 or more. When the hydrophilic compound has —OH as a crosslinkable group, the weight average molecular weight is preferably 6,000,000 or less from the viewpoint of production suitability.
In the case of having —NH ₂ as a crosslinkable group, the hydrophilic compound preferably has a weight average molecular weight of 10,000 or more. In this case, the weight average molecular weight of the hydrophilic compound is more preferably 15,000 or more, and particularly preferably 20,000 or more. When the hydrophilic compound has —NH ₂ as a crosslinkable group, the weight average molecular weight is preferably 1,000,000 or less from the viewpoint of production suitability.
For example, when PVA is used as the hydrophilic compound, the weight average molecular weight of the hydrophilic compound may be a value measured according to JIS K 6726. Moreover, when using a commercial item, what is necessary is just to use the molecular weight nominally mentioned in a catalog, a specification, etc.

As the crosslinkable group forming the hydrophilic compound, those capable of forming a hydrolysis-resistant crosslinked structure are preferably selected.
Specific examples include a hydroxy group (—OH), an amino group (—NH ₂ ), a chlorine atom (—Cl), a cyano group (—CN), a carboxy group (—COOH), and an epoxy group. . Among these, an amino group and a hydroxy group are preferably exemplified. Furthermore, most preferably, a hydroxy group is illustrated from the viewpoint of affinity with a carrier and a carrier carrying effect.

Specific examples of hydrophilic compounds include those having a single crosslinkable group such as polyallylamine, polyacrylic acid, polyvinyl alcohol, polyvinylpyrrolidone, polyacrylamide, polyethyleneimine, polyvinylamine, polyornithine, polylysine, Examples include polyethylene oxide, water-soluble cellulose, starch, alginic acid, chitin, polysulfonic acid, polyhydroxymethacrylate, poly-N-vinylacetamide and the like. Most preferred is polyvinyl alcohol. Moreover, as a hydrophilic compound, these copolymers are also illustrated.

Examples of hydrophilic compounds having a plurality of crosslinkable groups include polyvinyl alcohol-polyacrylic acid copolymers. A polyvinyl alcohol-polyacrylic salt copolymer is preferable because of its high water absorption ability and high hydrogel strength even at high water absorption.
The content of polyacrylic acid in the polyvinyl alcohol-polyacrylic acid copolymer is, for example, 1 to 95 mol%, preferably 2 to 70 mol%, more preferably 3 to 60 mol%, particularly preferably 5 to 50 mol%. It is.
In the polyvinyl alcohol-polyacrylic acid copolymer, the polyacrylic acid may be a salt. Examples of the polyacrylic acid salt in this case include ammonium salts and organic ammonium salts in addition to alkali metal salts such as sodium salts and potassium salts.

Polyvinyl alcohol is also available as a commercial product. Specific examples include PVA117 (manufactured by Kuraray Co., Ltd.), Poval (manufactured by Kuraray Co., Ltd.), polyvinyl alcohol (manufactured by Aldrich Co., Ltd.), J-Poval (manufactured by Nippon Vinegarten Poval Co., Ltd.), and the like. Various grades of molecular weight exist, but those having a weight average molecular weight of 130,000 to 300,000 are preferred.
A polyvinyl alcohol-polyacrylate copolymer (sodium salt) is also available as a commercial product. For example, Crustomer AP20 (made by Kuraray Co., Ltd.) is exemplified.

In the facilitated transport membrane 20a of the separation module 10 of the present invention, two or more hydrophilic compounds may be mixed and used.

The content of the hydrophilic compound in the facilitated transport film 20a functions as a binder for forming the facilitated transport film 20a, and the amount capable of sufficiently retaining moisture depends on the type of the hydrophilic composition or the carrier. It can be set as appropriate.
Specifically, 0.5 to 50% by mass is preferable, 0.75 to 30% by mass is more preferable, and 1 to 15% by mass is particularly preferable. By setting the content of the hydrophilic compound within this range, the above-mentioned function as a binder and the moisture retention function can be stably and suitably expressed.

The crosslinked structure in the hydrophilic compound can be formed by a conventionally known method such as thermal crosslinking, ultraviolet crosslinking, electron beam crosslinking, radiation crosslinking, or photocrosslinking.
Photocrosslinking or thermal crosslinking is preferred, and thermal crosslinking is most preferred.

For forming the facilitated transport film 20a, it is preferable to use a crosslinking agent together with the hydrophilic compound. That is, when forming the facilitated-transport film | membrane 20a by the apply | coating method, it is preferable to use the coating composition containing a crosslinking agent.
As the cross-linking agent, one containing a cross-linking agent having two or more functional groups capable of reacting with a hydrophilic compound and capable of cross-linking such as thermal cross-linking or photo-crosslinking is selected. The formed crosslinked structure is preferably a hydrolysis-resistant crosslinked structure.
From such a viewpoint, the crosslinking agent used for forming the facilitated transport film 20a includes an epoxy crosslinking agent, a polyvalent glycidyl ether, a polyhydric alcohol, a polyvalent isocyanate, a polyvalent aziridine, a haloepoxy compound, a polyvalent aldehyde, Preferred examples include valent amines and organometallic crosslinking agents. More preferred are polyvalent aldehydes, organometallic crosslinking agents and epoxy crosslinking agents, and among them, polyvalent aldehydes such as glutaraldehyde and formaldehyde having two or more aldehyde groups are preferred.

As an epoxy crosslinking agent, it is a compound which has 2 or more of epoxy groups, and the compound which has 4 or more is also preferable. Epoxy crosslinking agents are also available as commercial products, for example, trimethylolpropane triglycidyl ether (manufactured by Kyoeisha Chemical Co., Ltd., Epolite 100MF, etc.), Nagase ChemteX Corporation EX-411, EX-313, EX-614B, Examples include EX-810, EX-811, EX-821, EX-830, and Epiol E400 manufactured by NOF Corporation.
Moreover, the oxetane compound which has cyclic ether as a compound similar to an epoxy crosslinking agent is also used preferably. The oxetane compound is preferably a polyvalent glycidyl ether having two or more functional groups. Examples of commercially available products include EX-411, EX-313, EX-614B, EX-810, EX-811 manufactured by Nagase ChemteX Corporation. Examples include EX-821 and EX-830.

Examples of the polyvalent glycidyl ether include ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, glycerol polyglycidyl ether, diglycerol polyglycidyl ether, polyglycerol polyglycidyl ether, sorbitol polyglycidyl ether, pentaerythritol polyglycidyl ether, propylene Examples include glycol glycidyl ether and polypropylene glycol diglycidyl ether.

Examples of the polyhydric alcohol include ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, glycerin, polyglycerin, propylene glycol, diethanolamine, triethanolamine, polyoxypropyl, and oxyethylene oxypropylene block copolymer. Examples include coalescence, pentaerythritol, and sobitol.

Examples of the polyvalent isocyanate include 2,4-toluylene diisocyanate and hexamethylene diisocyanate.
Examples of the polyvalent aziridine include 2,2-bishydroxymethylbutanol-tris [3- (1-acyridinyl) propionate], 1,6-hexamethylenediethyleneurea, diphenylmethane-bis-4,4′-N, N Examples include '-diethylene urea.

Examples of the haloepoxy compound include epichlorohydrin and α-methylchlorohydrin.
Examples of the polyvalent aldehyde include glutaraldehyde and glyoxal.
Examples of the polyvalent amine include ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, and polyethyleneimine.
Furthermore, examples of the organometallic crosslinking agent include organic titanium crosslinking agents and organic zirconia crosslinking agents.

For example, when polyvinyl alcohol having a weight average molecular weight of 130,000 or more is used as the hydrophilic compound, it is possible to form a crosslinked structure having good reactivity with this hydrophilic compound and excellent hydrolysis resistance. Therefore, an epoxy crosslinking agent and glutaraldehyde are preferably used.
Further, when a polyvinyl alcohol-polyacrylic acid copolymer is used as the hydrophilic compound, an epoxy crosslinking agent or glutaraldehyde is preferably used.
In addition, when a polyallylamine having a weight average molecular weight of 10,000 or more is used as the hydrophilic compound, it is possible to form a crosslinked structure that has good reactivity with the hydrophilic compound and excellent hydrolysis resistance. Therefore, an epoxy crosslinking agent, glutaraldehyde, and an organometallic crosslinking agent are preferably used.
Further, when polyethyleneimine or polyallylamine is used as the hydrophilic compound, an epoxy crosslinking agent is preferably used.

What is necessary is just to set the quantity of a crosslinking agent suitably according to the kind of hydrophilic compound and crosslinking agent which are used for formation of the facilitated-transport film | membrane 20a.
Specifically, the amount is preferably 0.001 to 80 parts by mass, more preferably 0.01 to 60 parts by mass, and particularly preferably 0.1 to 50 parts by mass with respect to 100 parts by mass of the crosslinkable group possessed by the hydrophilic compound. preferable. By setting the content of the cross-linking agent in the above range, a facilitated transport film having good cross-linking structure formation and excellent shape maintainability can be obtained.
Further, focusing on the crosslinkable group possessed by the hydrophilic compound, the crosslinked structure is formed by reacting 0.001 to 80 mol of a crosslinking agent with respect to 100 mol of the crosslinkable group possessed by the hydrophilic compound. preferable.

As described above, in the acidic gas separation layer 20 of the separation module 10, the facilitated transport film 20a contains a carrier in addition to such a hydrophilic compound.
The carrier is various water-soluble compounds having affinity with an acidic gas (for example, carbon dioxide gas) and showing basicity. Specific examples include alkali metal compounds, nitrogen-containing compounds, and sulfur oxides.
The carrier may react indirectly with the acid gas, or the carrier itself may react directly with the acid gas.
The former reacts with other gas contained in the supply gas, shows basicity, and the basic compound reacts with acidic gas. More specifically, OH react with steam (water) ^- was released, the OH ^- that reacts with CO _2, a compound can be incorporated selectively CO ₂ in facilitated transport membrane 20a For example, an alkali metal compound.
The latter is such that the carrier itself is basic, for example, a nitrogen-containing compound or a sulfur oxide.

Examples of the alkali metal compound include alkali metal carbonate, alkali metal bicarbonate, and alkali metal hydroxide. Here, as the alkali metal, an alkali metal element selected from cesium, rubidium, potassium, lithium, and sodium is preferably used. In addition, in this invention, an alkali metal compound contains the salt and its ion other than alkali metal itself.

Examples of the alkali metal carbonate include lithium carbonate, sodium carbonate, potassium carbonate, rubidium carbonate, and cesium carbonate.
Examples of the alkali metal bicarbonate include lithium hydrogen carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate, rubidium hydrogen carbonate, and cesium hydrogen carbonate.
Furthermore, examples of the alkali metal hydroxide include lithium hydroxide, sodium hydroxide, potassium hydroxide, rubidium hydroxide, and cesium hydroxide.
Among these, an alkali metal carbonate is preferable, and a compound containing potassium, rubidium, and cesium having high solubility in water is preferable from the viewpoint of good affinity with acidic gas.

Moreover, when using an alkali metal compound as a carrier, two or more kinds of carriers may be used in combination.
When two or more types of carriers are present in the facilitated transport film 20a, different carriers can be separated from each other in the film. Thereby, due to the difference in deliquescence of a plurality of carriers, due to the hygroscopicity of the facilitated transport film 20a, the facilitated transport films 20a or the facilitated transport film 20a and other members are stuck together at the time of manufacture. (Blocking) can be suitably suppressed.
Moreover, when using 2 or more types of alkali metal compounds as a carrier by the point of being able to obtain the blocking inhibitory effect more suitably, the deliquescence property is more excellent than the first compound having deliquescence and the first compound. It is preferable to include a second compound having a low specific gravity. As an example, the first compound is exemplified by cesium carbonate, and the second compound is exemplified by potassium carbonate.

Nitrogen-containing compounds include amino acids such as glycine, alanine, serine, proline, histidine, taurine, diaminopropionic acid, hetero compounds such as pyridine, histidine, piperazine, imidazole, triazine, monoethanolamine, diethanolamine, triethanolamine , Alkanolamines such as monopropanolamine, dipropanolamine and tripropanolamine, cyclic polyetheramines such as cryptand [2.1] and cryptand [2.2], cryptand [2.2.1] and cryptand [ And bicyclic polyetheramines such as 2.2.2], porphyrin, phthalocyanine, ethylenediaminetetraacetic acid and the like.
Further, examples of the sulfur compound include amino acids such as cystine and cysteine, polythiophene, dodecylthiol and the like.

What is necessary is just to set suitably content of the carrier in the facilitated-transport film | membrane 20a according to the kind etc. of a carrier or a hydrophilic compound. Specifically, it is preferably 0.3 to 30% by mass, more preferably 0.5 to 25% by mass, and particularly preferably 1 to 20% by mass.
By setting the content of the carrier in the facilitated transport film 20a within the above range, in the composition (coating material) for forming the facilitated transport film 20a, salting out before coating can be suitably prevented, and further promoted The transport membrane 20a can reliably exhibit the acid gas separation function.

The facilitated transport film 20a (composition for forming the facilitated transport film 20a) may contain various components as necessary in addition to such a hydrophilic compound, a crosslinking agent and a carrier.

Examples of such components include antioxidants such as dibutylhydroxytoluene (BHT), compounds having 3 to 20 carbon atoms or fluorinated alkyl groups having 3 to 20 carbon atoms and hydrophilic groups, and siloxane structures. Specific compounds such as compounds having a surfactant, surfactants such as sodium octoate and sodium 1-hexasulfonate, polymer particles such as polyolefin particles and polymethyl methacrylate particles, and the like.
In addition, a catalyst, a moisturizing (moisture absorbing) agent, an auxiliary solvent, a film strength adjusting agent, a defect detecting agent, and the like may be used as necessary.

The facilitated transport film 20a may be composed of a single layer or a plurality of layers.
Here, in the case where the facilitated transport film 20a is composed of a plurality of layers, the same film may be laminated. You may laminate.

The acidic gas separation layer 20 includes such a facilitated transport membrane 20a and a porous support 20b.
The porous support 20b has acid gas permeability and can be coated with a coating composition for forming the facilitated transport film 20a (supporting the coating film). It supports the transport film 20a.
As the material for forming the porous support 20b, various known materials can be used as long as they can exhibit the above functions.

Here, in the separation module 10 of the present invention, the porous support 20b constituting the acidic gas separation layer 20 may be a single layer, but has a two-layer structure including a porous membrane and an auxiliary support membrane. Is preferred. By having such two configurations, the porous support 20b more reliably expresses the functions of acid gas permeability, application of the coating composition to be the facilitated transport film 20a, and support of the facilitated transport film 20a. .
When the porous support 20b is a single layer, various materials exemplified below as the porous film and the auxiliary support film can be used as the forming material.

In this two-layered porous support 20b, the porous membrane is on the facilitated transport membrane 20a side.
The porous membrane is preferably made of a material having heat resistance and low hydrolyzability. Specific examples of such a porous membrane include membrane filter membranes such as polysulfone, polyethersulfone, polypropylene, and cellulose, interfacially polymerized thin films of polyamide and polyimide, polytetrafluoroethylene (PTFE), and high molecular weight polyethylene. An example is a stretched porous membrane.
Among them, a stretched porous membrane of PTFE or high molecular weight polyethylene has a high porosity, is small in inhibition of diffusion of acidic gas (especially carbon dioxide gas), and is preferable from the viewpoints of strength and manufacturing suitability. Among them, a stretched porous membrane of PTFE is preferably used in terms of heat resistance and low hydrolyzability.

The porous membrane is hydrophobic because the facilitated transport membrane 20a containing moisture is likely to penetrate into the porous portion under the usage environment and does not cause deterioration in film thickness distribution or performance over time. Is preferred.
The porous membrane preferably has a maximum pore diameter of 1 μm or less.
Further, the average pore diameter of the pores of the porous membrane is preferably 0.001 to 10 μm, more preferably 0.002 to 5 μm, and particularly preferably 0.005 to 1 μm. By setting the average pore diameter of the porous membrane within this range, it is possible to suitably prevent the adhesive application region described later from sufficiently impregnating the adhesive and preventing the porous membrane from passing the acidic gas. .

The auxiliary support membrane is provided for reinforcing the porous membrane.
Various materials can be used as the support membrane as long as the required strength, stretch resistance and gas permeability are satisfied. For example, a nonwoven fabric, a woven fabric, a net, and a mesh having an average pore diameter of 0.001 to 10 μm can be appropriately selected and used.

The auxiliary support membrane is also preferably made of a material having heat resistance and low hydrolyzability, like the porous membrane described above.
Non-woven fabrics, woven fabrics, and knitted fabrics that have excellent durability and heat resistance include polyolefins such as polypropylene (PP), modified polyamides such as aramid (trade name), polytetrafluoroethylene, polyvinylidene fluoride, etc. A fiber made of a fluorine-containing resin is preferable. It is preferable to use the same material as the resin material constituting the mesh. Among these materials, a non-woven fabric made of PP that is inexpensive and has high mechanical strength is particularly preferably exemplified.

Since the porous support 20b has an auxiliary support film, the mechanical strength can be improved. Therefore, for example, even when handling in a coating apparatus using a roll-to-roll (hereinafter also referred to as RtoR) described later, wrinkles on the porous support 20b can be prevented, and productivity can be increased. .

If the porous support 20b is too thin, the strength is difficult. Considering this point, the thickness of the porous membrane is preferably 5 to 100 μm, and the thickness of the auxiliary support membrane is preferably 50 to 300 μm.
When the porous support 20b is a single layer, the thickness of the porous support 20b is preferably 30 to 500 μm.

Such an acidic gas separation layer 20 is prepared by preparing a liquid coating composition (coating / coating liquid) containing a component that becomes the facilitated transport film 20a, applying it to the porous support 20b, and drying it. It can be produced by a coating method.
That is, first, a hydrophilic compound, a carrier, and other components to be added as necessary are respectively added to water (room temperature water or warm water) in appropriate amounts, and sufficiently stirred to facilitate transport film 20a. A coating composition is prepared.
In the preparation of the coating composition, if necessary, dissolution of each component may be promoted by heating with stirring. Moreover, after adding a hydrophilic compound to water and melt | dissolving, precipitation (salting out) of a hydrophilic compound can be effectively prevented by adding a carrier gradually and stirring.

The acidic gas separation layer 20 is produced by applying this composition to the porous support 20b and drying it.
Here, the application and drying of the composition may be performed in a so-called single-wafer type, which is performed on a cut sheet-like porous support 20b cut into a predetermined size.
Preferably, the acid gas separation layer 20 is produced by so-called RtoR. That is, the prepared coating composition is applied while the porous support 20b is sent out from the feed roll formed by winding the long porous support 20b and conveyed in the longitudinal direction, and then the applied coating composition is applied. The product (coating film) is dried to produce the acidic gas separation layer 20 formed by forming the facilitated transport film 20a on the surface of the porous support 20b, and the produced acidic gas separation layer 20 is wound up.

What is necessary is just to set the conveyance speed of the porous support body 20b in RtoR suitably according to the kind of porous support body 20b, the viscosity of a coating liquid, etc.
Here, when the conveyance speed of the porous support 20b is too fast, the film thickness uniformity of the coating film of the coating composition may be lowered, and when it is too slow, the productivity is lowered. Considering this point, the conveying speed of the porous support 20b is preferably 0.5 m / min or more, more preferably 0.75 to 200 m / min, and particularly preferably 1 to 200 m / min.

Various known methods can be used for applying the coating composition.
Specific examples include curtain flow coaters, extrusion die coaters, air doctor coaters, blade coaters, rod coaters, knife coaters, squeeze coaters, reverse roll coaters, bar coaters, and the like.

The coating film of the coating composition may be dried by a known method. As an example, drying with warm air is exemplified.
The speed of the warm air may be set as appropriate so that the gel film can be quickly dried and the gel film is not broken. Specifically, 0.5 to 200 m / min is preferable, 0.75 to 200 m / min is more preferable, and 1 to 200 m / min is particularly preferable.
The temperature of the hot air may be appropriately set to a temperature at which the porous support 20b is not deformed and the gel membrane can be quickly dried. Specifically, the film surface temperature is preferably 1 to 120 ° C., more preferably 2 to 115 ° C., and particularly preferably 3 to 110 ° C.
Moreover, you may use together heating of the porous support body 20b for drying of a coating film as needed.

The laminated body 14 is further laminated with a permeating gas flow path member 26. In the illustrated example, the permeating gas channel member 26 is, for example, a rectangular sheet.
The permeating gas channel member 26 is a member for causing the acidic gas Gc that has reacted with the carrier and permeated the acidic gas separation layer 20 to flow through the through hole 12a of the central cylinder 12.
As described above, in the illustrated example, the laminate 14 includes the sandwiching body 36 in which the acidic gas separation layer 20 is folded in two with the facilitated transport film 20a inside, and the supply gas flow path member 24 is sandwiched therebetween. By laminating the permeating gas flow path member 26 on the sandwiching body 36 and bonding them with the adhesive layer 30, one laminated body 14 is configured.
The permeating gas flow path member 26 functions as a spacer between the stacked bodies 14, and the acidic gas separated from the source gas G reaches the through hole 12 a of the central cylinder 12 toward the winding center (inner side) of the stacked body 14. A flow path for the gas Gc is formed. Further, in order to properly form the flow path of the acidic gas Gc, the adhesive layer 30 described later needs to penetrate. Considering this point, the permeating gas channel member 26 is preferably a member having a mesh structure (net / mesh), like the supply gas channel member 24.

Various materials can be used as the material for forming the permeating gas channel member 26 as long as it has sufficient strength and heat resistance. Specifically, polyester-based materials such as epoxy-impregnated polyester, polyolefin-based materials such as polypropylene, fluorine-based materials such as polytetrafluoroethylene, inorganic materials such as metal, glass, and ceramics are preferably exemplified.

The thickness of the permeating gas channel member 26 may be appropriately determined according to the supply amount of the raw material gas G, the required processing capacity, and the like.
Specifically, 100 to 1000 μm is preferable, 150 to 950 μm is more preferable, and 200 to 900 μm is particularly preferable.

As described above, the permeating gas flow path member 26 is a flow path of the acidic gas Gc that is separated from the source gas G and permeates the acidic gas separation layer 20.
Therefore, it is preferable that the permeating gas channel member 26 has a low resistance to the flowing gas. Specifically, it is preferable that the porosity is high, the deformation is small when pressure is applied, and the pressure loss is small.

The porosity of the permeating gas channel member 26 is preferably 30 to 99%, more preferably 35 to 97.5%, and particularly preferably 40 to 95%.
Further, deformation when pressure is applied can be approximated by elongation when a tensile test is performed. Specifically, the elongation when a load of 10 N / 10 mm width is applied is preferably within 5%, more preferably within 4%.
Furthermore, the pressure loss can be approximated by a flow rate loss of compressed air that flows at a constant flow rate. Specifically, when 15 L / min of air is passed through the 15 cm square permeate gas channel member 26 at room temperature, the flow rate loss is preferably within 7.5 L / min, and within 7 L / min. More preferably.

Hereinafter, a lamination method of the laminated body 14 and a winding method of the laminated body 14, that is, a manufacturing method of the spiral laminated body 14 a will be described. In FIGS. 6A to 9 used in the following description, the supply gas flow path member 24 and the permeate gas flow path member 26 have end faces (end faces) in order to simplify the drawings and clearly show the configuration. Part) is shown in net form.

First, as conceptually shown in FIGS. 6 (A) and 6 (B), the extending direction of the central cylinder 12 and the short direction coincide with each other, and a kapton tape, an adhesive, etc. The end of the permeating gas flow path member 26 is fixed using the fixing means 34.
Here, it is preferable that the tube wall of the center tube 12 is provided with a slit (not shown) along the axial direction. In this case, the distal end portion of the permeating gas flow path member 26 is inserted into the slit, and is fixed to the inner peripheral surface of the central cylinder 12 by a fixing means. According to this configuration, when the laminated body including the permeating gas channel member 26 is wound around the central tube 12, the inner peripheral surface of the central tube 12 and the permeating gas channel Friction with the member 26 can prevent the permeate gas flow path member 26 from coming out of the slit, that is, the permeate gas flow path member 26 is fixed.

On the other hand, as conceptually shown in FIG. 7, the acidic gas separation layer 20 is folded in half with the facilitated transport membrane 20a inside, and the supply gas flow path member 24 is sandwiched therebetween. That is, a sandwiching body 36 is produced in which the supply gas flow path member 24 is sandwiched between the acidic gas separation layers 20 folded in half. In this case, the acidic gas separation layer 20 is not equally folded in half, but is folded in half so that one is slightly longer as shown in FIG.
Further, in order to prevent the facilitated transport film 20a from being damaged by the supply gas flow path member 24, a sheet-like protective member (for example, Kapton tape) folded in half at the trough portion where the acidic gas separation layer 20 is folded in half. Or a PTFE tape) is preferably disposed.

Further, an adhesive 30a to be the adhesive layer 30 is applied to the shorter surface of the acid gas separation layer 20 folded in half (the surface of the porous support 20b).
Here, as shown in FIG. 7, the adhesive 30 a (that is, the adhesive layer 30) extends in the vicinity of both ends in the x direction and is applied to the entire area in the y direction. In the vicinity of the end on the opposite side, it extends over the entire region in the x direction and is applied in a strip shape.
Hereinafter, the x direction (source gas supply direction) is also referred to as a width direction. In addition, as described above, the y direction orthogonal to the x direction coincides with the winding direction of the stacked body 14.

Next, as conceptually shown in FIGS. 8A and 8B, the surface coated with the adhesive 30 a is directed to the permeating gas flow path member 26, and the folded side is directed to the central cylinder 12. The sandwiching body 36 is laminated on the permeate gas channel member 26 fixed to the central cylinder 12, and the permeate gas channel member 26 and the acidic gas separation layer 20 (porous support 20b) are bonded.

Further, as shown in FIG. 8A, an adhesive 30a to be the adhesive layer 30 is applied to the upper surface of the laminated sandwiching body 36 (the surface of the long porous support 20b). In the following description, the direction opposite to the permeating gas flow path member 26 first fixed to the central cylinder 12 by the fixing means 34 is also referred to as the upper side.
As shown in FIG. 8A, the adhesive 30a on this surface is also applied in the form of a belt extending in the entire winding direction in the vicinity of both ends in the width direction, as described above, It extends in the entire width direction in the vicinity of the end on the opposite side and is applied in a strip shape.

Next, as conceptually shown in FIG. 9, a permeate gas flow path member 26 is laminated on the sandwiched body 36 coated with the adhesive 30 a, and the acidic gas separation layer 20 (porous support 20 b) and the permeate are permeated. The gas flow path member 26 is bonded to form the laminate 14.

Next, as shown in FIG. 7, as shown in FIG. 7, a sandwiching body 36 in which the supply gas flow path member 24 is sandwiched by the acidic gas separation layer 20 is produced, and an adhesive 30 a that becomes the adhesive layer 30 is applied. The permeated gas flow path member 26 and the sandwiching body 36 that are finally stacked are stacked and bonded with the side to which the adhesive is applied facing down.
Further, similarly to the above, an adhesive 30a is applied to the upper surface of the laminated sandwiching body 36 as shown in FIG. 8A, and then, as shown in FIG. The member 26 is laminated and bonded, and the second layered laminate 14 is laminated.

Thereafter, the steps of FIGS. 7 to 9 are repeated to stack a predetermined number of stacked bodies 14 as conceptually shown in FIG.
In this case, as shown in FIG. 10, it is preferable that the laminated body 14 is laminated so as to be gradually separated from the central tube 12 in the winding direction as it goes upward. Thereby, winding (wrapping) of the laminated body 14 around the center tube 12 is easily performed, and the end portion or the vicinity of the end portion of each permeate gas flow path member 26 on the center tube 12 side is preferably the center tube. 12 can be contacted.

When the predetermined number of the laminated bodies 14 are laminated, as shown in FIG. The adhesive 38b is applied between the sandwiching body 36 and the adhesive 36b.

Next, as shown by an arrow yw in FIG. 10, the laminated body 14 is wound (wound) around the central cylinder 12 so as to wind the laminated body 14.

After winding, the permeate gas flow path member 26 on the outermost periphery (that is, the lowermost layer first fixed to the central cylinder 12) is maintained for a predetermined time in a state where tension is applied in the pulling-out direction (winding and squeezing direction). Then, the adhesive 30a and the like are dried.
When a predetermined time has elapsed, the outermost permeate gas channel member 26 is fixed by ultrasonic welding or the like at a position where it has made one round, and the excess permeate gas channel member 26 outside the fixed position is cut. Thus, the spiral laminated body 14a formed by winding the laminated body 14 around the central cylinder 12 is completed.

As described above, the raw material gas G is supplied from the end of the supply gas flow path member 24, and the acidic gas Gc passes (transports) in the stacking direction through the acidic gas separation layer 20 to transmit the permeated gas flow. It flows into the road member 26, flows through the permeate gas flow path member 26, and reaches the central cylinder 12.

Here, the adhesive 30a is applied to the porous support 20b, and the adhesive 30a is bonded to the permeated gas flow path member 26 having a network structure. Therefore, the adhesive 30a permeates (impregnates) into the porous support 20b and the permeating gas flow path member 26, and the adhesive layer 30 is formed in both.
Further, as described above, the adhesive layer 30 (adhesive 30a) extends in the vicinity of both ends in the width direction (x direction) and extends in the entire winding direction (y direction) and is formed in a strip shape. Further, the adhesive layer 30 extends across the entire width direction in the vicinity of the end portion on the side opposite to the folded portion on the central tube 12 side so as to cross the adhesive layer 30 in the width direction in the vicinity of both ends in the width direction. Then, it is formed in a band shape. That is, the adhesive layer 30 is formed so as to surround the outer peripheries of the permeating gas flow path member 26 and the porous support 20b by opening the central tube 12 side. Further, the permeating gas channel member 26 is sandwiched between the facilitated transport films 20a.
As a result, an envelope-like flow path is formed in the permeate gas flow path member 26 of the laminate 14 so that the central tube 12 side is open. Therefore, the acidic gas Gc that has passed through the acidic gas separation layer 20 and has flowed into the permeate gas flow path member 26 flows toward the central cylinder 12 in the permeate gas flow path member 26 without flowing out, It flows into the center tube 12 from the through hole 12a.

In the separation module 10 of the present invention, various known adhesives can be used as long as the adhesive layer 30 (adhesive 30a) has sufficient adhesive strength, heat resistance, and moisture resistance.
Examples include epoxy resins, vinyl chloride copolymers, vinyl chloride-vinyl acetate copolymers, vinyl chloride-vinylidene chloride copolymers, vinyl chloride-acrylonitrile copolymers, butadiene-acrylonitrile copolymers, polyamide resins, polyvinyl butyral. Suitable examples include polyesters, cellulose derivatives (nitrocellulose, etc.), styrene-butadiene copolymers, various synthetic rubber resins, phenol resins, urea resins, melamine resins, phenoxy resins, silicon resins, urea formamide resins, and the like. .

The adhesive 30a to be the adhesive layer 30 may be applied once, but preferably, an adhesive diluted with an organic solvent such as acetone is applied first, and only the adhesive is applied thereon. preferable. In this case, the adhesive diluted with an organic solvent is preferably applied in a wide width, and the adhesive is preferably applied in a narrower width.
Thereby, the adhesive layer 30 (adhesive 30a) can be suitably infiltrated into the porous support 20b and the permeating gas channel member 26.

In the separation module 10 of the present invention, telescope prevention plates (telescope prevention members) 16 are disposed at both ends of the spiral laminate 14a produced in this way.
As described above, the telescope prevention plate 16 is a so-called telescope in which the spiral laminated body 14a is pressed by the source gas G, the supply-side end face is pushed in a nested manner, and the opposite end face protrudes in a nested manner. This is a member for preventing the phenomenon.

In the present invention, as the telescoping prevention plate 16, various known types used for spiral type separation modules can be used.
In the illustrated example, the telescope prevention plate includes an annular outer ring portion 16a, an annular inner ring portion 16b arranged in the outer ring portion 16a so as to coincide with the center, an outer ring portion 16a and an inner ring. And a rib (spoke) 16c for connecting and fixing the portion 16b. As described above, the center tube 12 around which the stacked body 14 is wound passes through the inner ring portion 16b.
In the illustrated example, the ribs 16c are provided radially at equal angular intervals from the center of the outer ring part 16a and the inner ring part 16b, and between the outer ring part 16a and the inner ring part 16b and each rib 16c. Is an opening 16d through which the source gas G or the residual gas Gr passes.

Further, the telescope prevention plate 16 may be disposed in contact with the end face of the spiral laminated body 14a. However, in general, in order to use the entire end face of the spiral laminate 14a for supplying the source gas and discharging the residual gas Gr, there is a slight gap between the telescope prevention plate 16 and the end face of the spiral laminate 14a. It is arranged.

Various materials having sufficient strength, heat resistance and moisture resistance can be used as the material for forming the telescope prevention plate 16.
Specifically, metal materials (for example, stainless steel (SUS), aluminum, aluminum alloy, tin, tin alloy, etc.), resin materials (for example, polyethylene resin, polypropylene resin, aromatic polyamide resin, nylon 12, nylon 66, polysulfin resin) , Polytetrafluoroethylene resin, polycarbonate resin, acrylic / butadiene / styrene resin, acrylic / ethylene / styrene resin, epoxy resin, nitrile resin, polyetheretherketone resin (PEEK), polyacetal resin (POM), polyphenylene sulfide (PPS) Etc.), and fiber reinforced plastics of these resins (for example, as the fiber, glass fiber, carbon fiber, stainless steel fiber, aramid fiber, etc.) are particularly preferable long fibers. Fiber-reinforced polypropylene, long glass fiber-reinforced polyphenylene sulfide), as well as ceramics (such as zeolite, alumina, etc.) and the like are preferably exemplified.
In addition, when using resin, you may use resin reinforced with glass fiber etc.

The coating layer 18 covers the peripheral surface of the spiral laminated body 14a, and blocks the discharge of the raw material gas G and the residual gas Gr from the peripheral surface other than the end face of the spiral laminated body 14a to the outside.

As the coating layer 18, various materials that can shield the raw material gas G and the like can be used. The covering layer 18 may be a cylindrical member or may be configured by winding a wire or a sheet-like member.
As an example, a wire made of FRP is impregnated with the adhesive used for the adhesive layer 30 described above, and the wire impregnated with the adhesive is wound around the spiral laminated body 14a in multiple layers without a gap as necessary. The covering layer 18 is illustrated.
In this case, if necessary, a sheet-like member such as Kapton tape is provided between the coating layer 18 and the spiral laminate 14a to prevent the adhesive from penetrating into the spiral laminate 14a. Also good.

Although the separation module (spiral type module for acid gas separation) of the present invention has been described in detail above, the present invention is not limited to the above-described example, and various improvements and modifications can be made without departing from the gist of the present invention. Of course, you may do this.

For example, in the above embodiment, the separation module using the facilitated transport membrane is used, but a dissolution diffusion type separation module may be used. By applying the present invention to the dissolution diffusion type separation module, the source gas can be uniformly supplied to the separation membrane, so that the gas separation performance of the separation module can be improved.
In addition, this invention is used suitably for the separation module using the facilitated-transport film | membrane which needs to supply a water | moisture content uniformly to a separation membrane for a performance improvement.

Hereinafter, specific examples of the present invention will be given and the spiral gas module for acid gas separation of the present invention will be described in more detail.

[Example 1]
<Production of acid gas separation layer>
3.3% by mass of polyvinyl alcohol-polyacrylic acid copolymer (Kuraray Co., Ltd., Crustomer AP-20), 0.016% by mass of a cross-linking agent (25% by mass aqueous glutaraldehyde manufactured by Wako Pure Chemical Industries, Ltd.), An aqueous solution containing was prepared. To this aqueous solution, 1M hydrochloric acid was added for crosslinking.
After crosslinking, a 40% aqueous cesium carbonate solution (manufactured by Rare Metal Co., Ltd.) was added so that the concentration of cesium carbonate was 7.0% by weight and defoamed to prepare a coating composition. That is, in this example, cesium carbonate serves as a carrier for the facilitated transport film 20a.

Then, the facilitated transport film 20a and the porous support 20b (a laminate (manufactured by GE)) obtained by laminating porous PTFE on the surface of a PP nonwoven fabric and dried are applied. An acidic gas separation layer 20 composed of the support 20b was produced.
The thickness of the facilitated transport film 20a was 50 μm.

<Production of separation module>
A central cylinder 12 having a slit extending in the center line direction on the side surface was prepared. A permeating gas flow path member 26 (tricot knitted epoxy-impregnated polyester) is fixed to the slit of the central cylinder 12 so as to be in a state shown in FIG. The center tube 12 has a partition inside.

On the other hand, the produced acidic gas separation layer 20 was folded in two with the facilitated transport membrane 20a inside. As shown in FIG. 7, the half-folding was performed so that one acidic gas separation layer 20 was slightly longer. Kapton tape was attached to the valley of the acid gas separation layer 20 folded in half, and the end of the supply gas flow path member 24 was reinforced so as not to damage the valley of the facilitated transport film 20a.
Subsequently, the supply gas flow path member 24 (a polypropylene net having a thickness of 0.44 mm, a size (x direction × y direction) 500 mm × 800 mm) is sandwiched between the acid gas separation layer 20 folded in half, and the sandwich body 36 is Produced.

The supply gas flow path member 24 has

flow path walls

50a and 50b as conceptually shown in FIG. 3A as flow path changing members for the source gas G. .
The

channel walls

50a and 50b were formed of an epoxy adhesive. The thickness of the

channel walls

50a and 50b was 8 mm. The

flow path walls

50 a and 50 b were arranged at positions symmetrical to the center line in the y direction on the inlet end face side of the supply gas flow path member 24. The length of the

channel walls

50a and 50b in the x direction was 250 mm. That is, it was set to 50% of the length of the supply gas flow path member. The distance between the

flow path walls

50a and 50b was 50 mm at the inlet end face. The angle formed by the

channel walls

50a and 50b was an average angle of 30 °.

As shown in FIG. 7, on the side of the porous support 20b on which the acidic gas separation layer 20 of the sandwich 36 is shorter, the entire region in the winding direction (y direction) is located near both ends in the width direction (x direction). And an adhesive 30a made of an epoxy resin having a high viscosity (about 40 Pa · s) extending in the entire width direction in the vicinity of the end opposite to the folded portion in the winding direction. E120HP manufactured by Henkel Japan KK was applied.
Next, the side to which the adhesive 30a was applied was directed downward, and as shown in FIG. 8A, the sandwiching body 36 and the permeating gas channel member 26 fixed to the central cylinder 12 were laminated and bonded.
Next, on the upper surface of the acidic gas separation layer 20 of the sandwiching body 36 laminated on the permeating gas channel member 26, as shown in FIG. The adhesive 30a was applied to the entire region in the width direction in the vicinity of the end on the side opposite to the folded portion in the winding direction. Furthermore, as shown in FIG. 9, the permeated gas flow path member 26 is laminated on the acidic gas separation layer 20 coated with the adhesive 30a and bonded to form the first layered product 14. did.

In the same manner as described above, another sandwiching body 36 shown in FIG. 7 was produced, and similarly, the adhesive 30a was similarly applied to the porous support 20b side of the short acid gas separation layer 20. Next, in the same manner as in FIG. 8A, the sandwiched body 36 is set to the first layered body 14 (the permeate gas flow path member 26) formed first on the side to which the adhesive 30 a has been applied. It laminated | stacked on the laminated body 14 (the member 26 for permeate gas channels) of the layer, and was adhere | attached. Further, an adhesive 30a is applied to the upper surface of the sandwiching body 36 in the same manner as in FIG. 8A, and a permeating gas flow path member 26 is laminated thereon and adhered in the same manner as in FIG. A second layered laminate 14 was formed.
Further, the third layered product 14 was formed on the second layered product 14 in the same manner as the second layer.

After laminating the three-layer laminate 14 on the permeate gas flow path member 26 fixed to the central cylinder 12, an adhesive 38a is applied to the peripheral surface of the central cylinder 12, as shown in FIG. The adhesive 38b was applied onto the permeating gas flow path member 26 between the central cylinder 12 and the lowermost layered laminate 14. The

adhesives

38a and 38b were the same as the adhesive 30a.
Next, the central cylinder 12 is rotated in the direction of the arrow yx in FIG. Thus, a spiral laminate 14a was obtained.

Furthermore, the center tube 12 was inserted into the inner ring portion 16b at both ends of the spiral laminate 14a, and the PPS telescope prevention plate 16 made of 40% glass fiber having the shape shown in FIG. 10 was attached.
Further, the coating layer 18 was formed by performing FRP processing on the peripheral surface of the telescope prevention plate 16 and the peripheral surface of the spiral laminated body 14a, and the separation module 10 was created.
The membrane area of the created separation module 10 is 1.2 m ² in total for the three layers (design value).

[Example 2]
A separation module was produced in the same manner as in Example 1 except that the length of the flow path wall 50a and the flow path wall 50b in the x direction was 50 mm, that is, 10% of the length of the supply gas flow path member.

[Example 3]
A separation module was produced in the same manner as in Example 1 except that the length in the x direction of the flow path wall 50a and the flow path wall 50b was 450 mm, that is, 90% of the length of the supply gas flow path member.

[Example 4]
A separation module was produced in the same manner as in Example 1 except that the length in the x direction of the flow path wall 50a and the flow path wall 50b was 150 mm, that is, 30% of the length of the supply gas flow path member.

[Example 5]
A separation module was produced in the same manner as in Example 1 except that the length in the x direction of the flow path wall 50a and the flow path wall 50b was 25 mm, that is, 5% of the length of the supply gas flow path member.

[Comparative Example 1]
A separation module was prepared in the same manner as in Example 1 except that the supply gas channel member 24 did not have the

channel walls

50a and 50b.

<Module factor>
By measuring the separation factors of the separation modules of the produced separation modules of Examples and Comparative Examples, the separation module and the facilitated transport membrane 20a itself on the porous support 20b used in the separation module, Calculated.
In this example, the CO ₂ / H ₂ separation factor and the CO ₂ / N ₂ separation factor were measured, and the module factor was calculated for each separation factor.

(Measurement of separation factor of separation module)
CO ₂ / H ₂ separation factor; H ₂ : CO ₂ : H ₂ O = 45: 5: 50 (partial pressure ratio) of raw material gas G (flow rate 2.2 L (liter) / min) at a temperature of 130 ° C. and a total pressure of 301 The gas was supplied to each separation module at 3 kPa, and Ar gas (flow rate: 0.9 L / min) was allowed to flow on the permeation side. The permeated gas was analyzed with a gas chromatograph, and the CO ₂ / H ₂ separation factor (α) was calculated.
CO ₂ / N ₂ separation factor; N ₂ : CO ₂ : H ₂ O = 66: 21: 13 (partial pressure ratio) source gas G (flow rate 1.72 L / min) at a temperature of 130 ° C. and a total pressure of 2001.3 kPa , Supplied to each separation module. The permeated gas was analyzed with a gas chromatograph, and the CO ₂ / N ₂ separation factor (α) was calculated.

(Measurement of separation factor of facilitated transport membrane 20a itself on porous support 20b)
CO ₂ / H ₂ separation factor; H ₂ : CO ₂ : H ₂ O = 45: 5: 50 (partial pressure ratio) source gas G (flow rate 0.32 L / min) at a temperature of 130 ° C. and a total pressure of 301.3 kPa Then, the gas was supplied to the facilitated transport film 20a, and Ar gas (flow rate: 0.04 L / min) was allowed to flow on the permeate side. The permeated gas was analyzed with a gas chromatograph, and the CO ₂ / H ₂ separation factor (α) was calculated.
CO ₂ / N ₂ separation factor; N ₂ : CO ₂ : H ₂ O = 66: 21: 13 (partial pressure ratio) source gas G (flow rate 0.32 L / min) at a temperature of 130 ° C. and a total pressure of 2001.3 kPa , And supplied to the facilitated transport film 20a. The permeated gas was analyzed with a gas chromatograph, and the CO ₂ / N ₂ separation factor (α) was calculated.

Using the CO ₂ / H ₂ separation factor (α) and the CO ₂ / N ₂ separation factor (α) measured as described above, the module factor was calculated by the following equation.
Module factor = (α) of separation module / (α) of facilitated transport membrane 20a
The results are shown in the table below.

As shown in the above table, the separation module of the present invention having the flow path wall in the supply gas flow path member 24 shows a higher module factor than the separation module of the comparative example having no flow path wall. It can be seen that it has excellent separation performance.
Further, in comparison with Examples 1 to 5, in the x direction, the length of the flow path changing member is preferably 10% or more of the length of the supply gas flow path member, and is preferably 30 to 60%. Is more preferable.
From the above results, the effects of the present invention are clear.

It can be suitably used for hydrogen gas production and natural gas purification.

DESCRIPTION OF SYMBOLS 10 Separation module 12 Center cylinder 12a Through-hole 12b Open end 14 Laminated body 14a Spiral laminated body 16 Telescope prevention plate 16a Outer ring part 16b Inner ring part 16c Rib 16d Opening part 18 Covering layer 20 Acid gas separation layer 20a Accelerated transport film 20b Porous support 24 Supply gas flow path member 26 Permeate gas flow path member 30

Adhesive layer

30a, 38a, 38b Adhesive 34 Fixing means 36 Holding body 40

Adhesive member

50a, 50b, 50c, 50d, 50e, 50f Flow Road wall 52

Wall member

60a,

60b Base

62a, 62b Second solution

Claims

A central tube having a through-hole formed in a tube wall, a supply gas channel member serving as a source gas channel, and an acid gas separation membrane for separating acid gas from the source gas flowing through the supply gas channel member An acidic gas separation layer on the surface of the supply gas flow path member side, and a permeate gas flow path member that serves as a flow path through which the acidic gas that has passed through the acidic gas separation membrane flows to the central cylinder, One or more laminates having the supply gas flow path member, the acidic gas separation layer, and the permeate gas flow path member are wound around the central cylinder, and the acidic gas separation spiral type module comprises:
Two or more flow path changing members for changing the flow path of the raw material gas are provided on the inlet end face side serving as the raw material gas inlet of the supply gas flow path member of the laminate,
A spiral-type module for acid gas separation in which a gap between at least one pair of the two or more flow path changing members increases as the distance from the inlet end surface increases in a direction perpendicular to the inlet end surface.
The spiral gas module for acid gas separation according to claim 1, wherein the acid gas separation membrane is a facilitated transport membrane containing a carrier that reacts with an acid gas and a hydrophilic compound for supporting the carrier.
3. The acidic gas separation spiral type according to claim 1, wherein the two or more flow path changing members are arranged symmetrically about the center line in the extending direction of the inlet end face of the supply gas flow path member. module.
A plurality of sets of the flow path changing members are arranged in a direction perpendicular to the inlet end face,
The acid gas separating spiral according to any one of claims 1 to 3, wherein a gap between the flow path changing members that form a pair increases as the distance from the inlet end face increases in a direction perpendicular to the inlet end face. Type module.
Two sets of the flow path changing members arranged symmetrically about the center line in the extending direction of the inlet end face of the supply gas flow path member,
The acidic gas separation member according to any one of claims 1 to 3, wherein the flow path changing member of one set is disposed closer to the center line than the flow path changing member of the other set. Spiral type module.
The length of the two or more flow path changing members in a direction perpendicular to the inlet end face is 10% or more of the length of the supply gas flow path member. Spiral type module for acid gas separation.
Having two or more of the laminates,
The spiral-type module for acid gas separation according to any one of claims 1 to 6, wherein the arrangement positions of the two or more flow path changing members are different for each of the laminates.
Having two or more of the laminates,
The spiral-type module for acid gas separation according to any one of claims 1 to 7, wherein the two or more flow path changing members have different shapes for each laminate.
A method for producing a spiral-type module for acid gas separation according to any one of claims 1 to 8,
A step of impregnating a formation position of the two or more flow path changing members of the supply gas flow path member with a second solution obtained by diluting the first solution as a material of the two or more flow path changing members with a solvent. When,
And a step of dissolving the first solution in the second solution impregnated in the supply gas flow path member.
A method for producing a spiral-type module for acid gas separation according to any one of claims 1 to 8,
Forming the two or more flow path changing members on the surface of the acidic gas separation membrane;
A method for producing a spiral-type module for acid gas separation, comprising: stacking the acid gas separation layer on which the two or more flow path changing members are formed and the supply gas flow path member.