Assembly having ion exchanger, manufacturing method thereof, and ion exchange device

Abstract

To enable arbitrary setting of flow conditions for a solution to be treated using organic solvents or similar substances as the solution to be treated, without causing ion exchanger detachment or similar issues, and to effectively perform ion exchange treatment on the solution to be treated even when the amount of the solution to be treated is small.SOLUTION: An ion exchange device comprises: a tube 10; a sleeve member 30 that is inserted into one end A of the tube 10 and has a flow path 33 that passes through it to allow liquid to flow out of the tube; a perforated plate 40 that has through holes 41 and is placed inside the tube 10 so as to abut against a step formed by the inner wall of the tube 10 and the tip surface 31 of the sleeve member 30; and an organic porous ion exchanger (monolith ion exchanger) 20 that is placed inside the tube 10 on the side opposite the one end A with the perforated plate 40 in between. The tube 10, sleeve member 30 and perforated plate 40 are made of, for example, fluororesin.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an assembly in which an ion exchanger is arranged for performing an ion exchange process, a method for manufacturing the same, and an ion exchange apparatus using such an assembly. [Background technology]

[0002] Demands for higher purity of organic solvents used in semiconductor device manufacturing processes and the like are becoming increasingly stringent. In particular, there is a strong demand for reducing ionic impurities, such as metals, in organic solvents. Chemicals, such as organic solvents, used in semiconductor device manufacturing are typically purified in a chemical factory, transported, stored in tanks within the semiconductor device manufacturing factory, and then supplied to use points (points of use) within the manufacturing factory via piping. The chemicals supplied to use points may be contaminated by impurities leaching from tanks, piping, valves, and the like. Therefore, in semiconductor device manufacturing, ion exchangers and liquid purification cartridges for purifying organic solvents are installed in locations close to the use points. The same applies to the ultrapure water used in semiconductor device manufacturing processes. Because large amounts of ultrapure water are used in semiconductor device manufacturing, large ultrapure water production systems are installed within semiconductor device manufacturing factories, and ultrapure water is supplied to various use points within the factory via piping. Even the ultrapure water supplied to use points may contain impurities leaching from piping and valves, so ion exchangers are installed in locations close to the use points to remove impurities from the ultrapure water.

[0003] Patent Document 1 discloses an organic solvent refiner used to remove metal ions contained as impurities in organic solvents. The refiner has an ion exchange resin and a filtering member arranged in a housing having an inlet and an outlet, from the upstream side along the flow direction of the organic solvent, and the filtering member is made of a microporous membrane.

[0004] Patent Document 2 discloses a method for removing metal ions from an organic solvent by passing the organic solvent through an organic porous ion exchanger. While typical ion exchange resins are bead- or granular-shaped with diameters of a few millimeters or less, organic porous ion exchangers, as described in Patent Document 2, have a skeleton made of an organic polymer, with continuous, cellular macropores forming an open-cell structure (i.e., a continuous macropore structure), and ion exchange groups are introduced into the organic polymer skeleton. Organic porous ion exchangers are also called monolithic organic porous ion exchangers, monolithic ion exchangers, or monolithic ion exchangers. In particular, organic porous ion exchangers that are anion exchangers are called monolithic anion exchangers (AEMs: Anion Exchange Monoliths), and organic porous ion exchangers that are cation exchangers are called monolithic cation exchangers (CEMs: Cation Exchange Monoliths). Organic porous ion exchangers can be molded into any shape and size. Because of their continuous macropore structure, organic porous ion exchangers are formed like an elastic sponge, allowing the liquid to be treated to pass through them, during which ion exchange occurs. By using an organic porous ion exchanger, polyvalent metal ions in organic solvents can be removed more efficiently than when a general granular ion exchange resin is used, as described in Patent Document 2. An example of a method for producing an organic porous ion exchanger is described in Patent Document 2.

[0005] Organic porous ion exchangers can also be used to remove impurity ions contained in water. Patent Document 3 discloses a liquid purification cartridge for removing impurities such as metals from aqueous solutions or organic solvents, in which an organic porous ion exchanger is packed on the upstream side of a substantially cylindrical cartridge container and a microfiltration membrane is placed on the downstream side. The liquid purification cartridge configured in this manner is housed in a housing for use. Patent Document 4 discloses that an organic porous ion exchanger is placed in a pipe with flanges attached to both ends, and ionic impurities in the water to be treated are removed by flowing the water through this pipe. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] International Publication No. 2013 / 165602 [Patent Document 2] Japanese Patent Application Laid-Open No. 2017-119233 [Patent Document 3] Japanese Patent Application Publication No. 2019-195763 [Patent Document 4] Japanese Patent Publication No. 2022-154537 Summary of the Invention [Problem to be solved by the invention]

[0007] When an organic porous ion exchanger is filled into a cylindrical cartridge container and used to remove ionic impurities from an organic solvent, the cartridge container is housed in a housing composed of a head to which the cartridge container can be attached and a bowl that, together with the head, forms a sealed space. An opening is provided on the side or bottom of the cartridge container to introduce the liquid to be treated into the cartridge container and supply the liquid to the organic porous ion exchanger. When an opening is provided on the side, a cylindrical organic porous ion exchanger with a doughnut-shaped cross section is used, while when an opening is provided on the bottom, a solid, cylindrical organic porous ion exchanger is used. When such a cartridge container is attached to a housing and used, the outer surface of the cartridge container also comes into contact with the liquid to be treated inside the housing, which raises the risk of contamination due to contact between the outer surface of the cartridge container and a contamination source (such as an operator or the environment) during the installation process.

[0008] Housings fitted with cartridge containers filled with organic porous ion exchangers are widely used to mount filter cartridges in the field of pure water production. For example, housings with sizes suitable for filter cartridges with lengths such as 127 mm and 254 mm are commercially available. However, using such housings results in a large residual volume of liquid, making it difficult to treat small amounts of liquid and significantly cost-inefficient when treating expensive chemicals. Another issue is the physical space required for the housing. Furthermore, when a standardized cartridge container with fixed dimensions is used and filled with an organic porous ion exchanger, setting the flow rate in the cartridge container uniquely determines both the space velocity (SV) and linear velocity (LV) of the liquid being treated through the organic porous ion exchanger, making it difficult to arbitrarily determine the treatment conditions for the liquid being treated through the organic porous ion exchanger.

[0009] Because organic porous ion exchangers are sponge-like, they can be inserted into piping as described in Patent Document 4. However, the volume of organic porous ion exchangers changes depending on the type of liquid they come into contact with and whether the ion-exchange groups are in the salt or regenerated form. When an organic porous ion exchanger shrinks, it may slip out of the piping due to the liquid flow pressure. This detachment not only prevents ion exchange processing but also adversely affects downstream equipment. Because of this risk, high pressure or high flow rate liquid passage is not possible when an organic porous ion exchanger is inserted into a piping. Organic porous ion exchangers are wet with water during their manufacture, and such organic porous ion exchangers often dehydrate and shrink when they come into contact with organic solvents. Therefore, detachment of the organic porous ion exchanger from the piping is particularly likely when the organic porous ion exchanger immediately after manufacture is packed into a piping to purify organic solvents.

[0010] The object of the present invention is to provide an assembly capable of performing ion exchange treatment on not only water but also organic solvents as the treated liquid, which allows the liquid flow conditions for the treated liquid to be set arbitrarily without causing the ion exchanger to fall off, and which can perform ion exchange treatment on the treated liquid well even when the amount of the treated liquid is small, a method for manufacturing such an assembly, and an ion exchange device equipped with such an assembly. [Means for solving the problem]

[0011] An assembly according to one embodiment of the present invention comprises a resin tube, a resin sleeve member inserted into one end of the tube and having a flow path therethrough to allow liquid to flow out of the tube, a resin perforated plate having a through hole and positioned inside the tube so as to abut against a step formed by the inner wall of the tube and the tip surface of the sleeve member, and an organic porous ion exchanger positioned inside the tube on the opposite side of the perforated plate from the one end, with the perforated plate sandwiched between them; and the organic porous ion exchanger is prevented from falling off the tube.

[0012] A manufacturing method of one embodiment of the present invention is a method for manufacturing the assembly of the above embodiment, and includes an insertion step of inserting a sleeve member into one end of a tube, a first arrangement step of inserting a perforated plate into the tube from the other end of the tube so that it abuts the step portion after the insertion step, and a second arrangement step of inserting an organic porous ion exchanger into the tube from the other end of the tube so that it abuts the perforated plate after the first arrangement step.

[0013] An ion exchange apparatus according to one aspect of the present invention is an ion exchange apparatus for performing ion exchange treatment on a liquid to be treated, and includes the assembly according to the aspect described above, in which the liquid to be treated flows from the other end of the tube to one end thereof. [Effects of the Invention]

[0014] According to the present invention, when ion exchange treatment is performed using not only water but also organic solvents as the treated liquid, the liquid flow conditions for the treated liquid can be set arbitrarily without causing the ion exchanger to fall off, etc., and ion exchange treatment can be performed well on the treated liquid even when the amount of the treated liquid is small. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 2 is a cross-sectional view illustrating an assembly according to the first embodiment. [Figure 2] FIG. [Figure 3] FIG. 2 is a perspective view showing an example of the configuration of a tube. [Figure 4] FIG. 10 is a cross-sectional view illustrating an assembly according to a second embodiment. [Figure 5] FIG. 10 is a cross-sectional view illustrating an assembly according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] Next, a configuration for carrying out the present invention will be described with reference to the drawings.

[0017] [First embodiment] FIG. 1 is a cross-sectional view illustrating an assembly according to a first embodiment, showing the manufacturing process of the assembly in sequence as indicated by (a) to (i) in the figure. The assembly of the first embodiment performs ion exchange treatment on a liquid to be treated, which is water or an organic solvent, and removes ionic impurities contained in the liquid to be treated. An organic porous ion exchanger 20 (i.e., a monolithic ion exchanger) is disposed inside a resin tube 10 with a circular cross section, which serves as a conduit through which the liquid to be treated flows. Simply disposing the organic porous ion exchanger 20 inside the tube 10 could cause the organic porous ion exchanger 20 to move due to the pressure it receives when the liquid to be treated is passed through it. In extreme cases, the organic porous ion exchanger 20 could fall out of the tube 10. Therefore, in the assembly of this embodiment, a resin sleeve member 30 is inserted into one end A of the tube 10, and a resin perforated plate 40 is placed so as to abut against the step formed by the tip surface 31 of the sleeve member 30 and the inner wall of the tube 10. The provision of this perforated plate 40 prevents the organic porous ion exchanger 20 from falling out of one end A of the tube 10. The manufacturing process of the assembly of this embodiment will be described below with reference to Figure 1.

[0018] 1A shows the tube 10 before the sleeve member 30 is inserted. The tube 10 has an inner diameter d. The sleeve member 30 is a substantially cylindrical member that has a leading end surface 31, which is the surface that is farther from one end A of the tube 10 when inserted into the one end A, and a rear end surface 32, which is the surface that is closer to the one end A. A flow path 33 is formed that penetrates between the leading end surface 31 and the rear end surface 32 to enable liquid that has flowed through the tube 10 to flow out from the one end A of the tube 10. The diameter of the sleeve member 30 at the leading end surface 31 and the rear end surface 32 is slightly smaller than the inner diameter d of the tube 10. In contrast, the outer surface of the sleeve member 30 bulges outward in the region between the leading end surface 31 and the rear end surface 32, forming a ridge portion 34, and the outer diameter of the sleeve member 30 at the ridge portion 34 is larger than the inner diameter d of the tube 10.

[0019] FIG. 1(b) shows the state in which the sleeve member 30 has been inserted into one end A of the tube 10 by press-fitting. The rear end surface 32 of the sleeve member 30 is also inside the tube 10, and the sleeve member 30 is completely inserted into the tube 10. Because the diameter of the sleeve member 30 at the front end surface 31 is smaller than the inner diameter d of the tube 10, it is easy to press-fit the sleeve member 30 into one end A of the tube 10, assuming that the tube 10 has adequate elasticity. Because the outer diameter of the sleeve member 30 at the ridge portion 34 is larger than the inner diameter d of the tube 10, the ridge portion 34 expands the inner wall of the tube 10, forming an expanded portion B in this portion where the outer diameter of the tube 10 is expanded. Next, a perforated plate 40 is inserted into the tube 10 from the other end of the tube 10 so as to abut against the step formed by the front end surface 31 of the sleeve member 30 and the inner wall of the tube 10. In FIG. 1, (c) shows the state in which the perforated plate 40 is being moved toward the step using a push rod 70, which is a jig, and (d) shows the state in which the perforated plate 40 has been placed at the step. As shown in FIG. 2, the perforated plate 40 is a disk-shaped member having a diameter slightly smaller than the inner diameter d of the tube 10. The perforated plate 40 has through-holes 41 formed therein to allow liquid to flow through it. In the illustrated example, the perforated plate 40 has a large number of through-holes 41 dispersed therein. Dispersing the through-holes 41 allows for uniform liquid flow within the organic porous ion exchanger 20.

[0020] After the perforated plate 40 has been placed on the stepped portion inside the tube 10, the organic porous ion exchanger 20 is inserted into the tube 10 from the other end so that it abuts against the perforated plate 40. In FIG. 1, (e) shows the state in which the organic porous ion exchanger 20 is being moved toward the perforated plate 40 using a push rod 70, and (f) shows the state in which the organic porous ion exchanger 20 has been placed. In the state shown in (f), the organic porous ion exchanger 20 is placed on the opposite side of the tube 10 from the end A of the tube 10, sandwiching the perforated plate 40 between them, forming a completed assembly according to the first embodiment. Therefore, the configuration shown in (f) can be considered the basic form of the assembly according to the first embodiment. The organic porous ion exchanger 20 is formed in a cylindrical shape with a diameter slightly smaller than the inner diameter d of the tube 10. It may be an anion exchanger (i.e., an organic porous anion exchanger) or a cation exchanger (i.e., an organic porous cation exchanger). In the figure, one organic porous ion exchanger 20 is disposed in the tube 10, but multiple organic porous ion exchangers 20 can also be disposed in the tube 10. For example, both an organic porous anion exchanger and an organic porous cation exchanger can also be disposed in the tube 10.

[0021] When a liquid is flowed from the other end of the tube 10 toward the end A as indicated by the arrow F in the state shown in FIG. 1(f), the organic porous ion exchanger 20 is subjected to the pressure of the flow. However, because it is supported by the perforated plate 40 held by the step, it does not fall out of the tube 10. Since the ion exchange process is performed on the liquid to be treated by flowing the liquid through the tube 10 in the direction of arrow F, the structure shown in FIG. 1(f) can be used as an ion exchange device. An ion exchange device having the structure shown in FIG. 1(f) can be used, for example, near the location where the ultrapure water or organic solvent is used to remove ionic impurities contained in the ultrapure water or organic solvent supplied thereto. Because this ion exchange device uses the organic porous ion exchanger 20, it is particularly suitable for removing ionic impurities from the organic solvent being treated. The inner diameter d of the tube 10 can be selected from a wide range of options, from a few millimeters to several hundred millimeters. Since the inner diameter d of the tube 10 can be set essentially arbitrarily, the diameter of the cylindrical organic porous ion exchanger 20 can be set arbitrarily. Furthermore, the length of the organic porous ion exchanger 20 in the flow direction can also be set arbitrarily. This ion exchange device has the advantage that the linear velocity (LV) and space velocity (SV) can be independently set according to the flow rate, i.e., the treatment conditions for the ion exchange treatment of the treated liquid can be set arbitrarily. Furthermore, by using a tube 10 with a small inner diameter d, the influence of residual liquid can be ignored, making it possible to perform ion exchange treatment on small amounts of the treated liquid. This ion exchange device is therefore advantageous when performing ion exchange treatment on expensive chemical solutions.

[0022] In this embodiment, the parts that come into contact with the liquid, i.e., the tube 10, the sleeve member 30, and the perforated plate 40, are made of a material that is chemically stable and has a low elution rate of impurities. Specifically, the tube 10, the sleeve member 30, and the perforated plate 40 are made of a material selected from the group consisting of, for example, fluororesin, polyethylene (PE), and polypropylene (PP). Examples of fluororesin include perfluoroalkoxyalkane (PFA) and polytetrafluoroethylene (PTFE). Among these, it is preferable to use PFA for the tube 10, as it is particularly chemically stable, has a particularly low elution rate of impurities, and allows for easy visual inspection of the flow of liquid inside the tube 10 and the state of the organic porous ion exchanger 20.

[0023] Both ultrapure water and organic solvents have extremely high resistivities, making them susceptible to charging in resin tubes 10 and other similar devices. If the tube 10 becomes charged and a discharge occurs as a result, there is a risk of fire if the liquid flowing through the tube 10 is an organic solvent. To prevent charging of the tube 10, it is preferable to use a tube 10 having a conductive layer formed on at least a portion of its outer surface. One example of such a tube is commercially available conductive PFA tube. FIG. 3 is a perspective view of a tube 10 made of conductive PFA. The tube 10 shown in FIG. 3 is mostly composed of a PFA portion 11 made of high-purity PFA. In particular, the entire portion that comes into contact with the liquid is composed of the PFA portion 11. Meanwhile, a conductive PFA portion 12 is provided on a portion of the outer surface of the tube 10 as a conductive layer. The conductive PFA portion 12 is made of PFA mixed with a conductive filler, which is a conductive material. In the illustrated example, the conductive PFA portion 12 is formed in a strip shape extending in the longitudinal direction of the tube 10.

[0024] In the assembly of this embodiment, i.e., the ion exchange device shown in FIG. 1(f), when it is attached to other piping or tubing for use, the outer surface of the tube 10 does not come into contact with the liquid. Therefore, contamination can be prevented when holding the outer surface of the tube 10 for installation or other operations. This assembly, i.e., the ion exchange device, can be configured with a union joint structure for connection to other piping or tubing. By configuring the assembly so that a union joint structure can be used, the possibility of contact between the organic porous ion exchanger 20 and a contamination source can be further reduced when the assembly is attached to piping or the like as an ion exchange device, and the possibility of contamination of the organic porous ion exchanger 20 or the liquid-contacting parts inside the assembly can be further reduced.

[0025] When the assembly of this embodiment is used as a union joint structure, a union nut 50 and a joint member 60 are prepared, as shown in FIG. 1(g). The tube 10 passes through the union nut 50 and is slidable along the tube 10. The union nut 50 also has a female thread 51. The joint member 60 has a flow path 61 through which liquid flows out of one end A of the tube 10, and an engaging portion 62 at the tip of the flow path 61 that receives the one end A of the tube 10. Furthermore, a male thread 63, which is a thread groove corresponding to the female thread 51 of the union nut 50, is formed on the outer periphery of the joint member 60. Then, as shown in FIG. 1(h), one end A of the tube 10 is inserted into the flow path 61 of the joint member 60 and engaged with the engaging portion 62. Next, as shown in FIG. 1(i), the female thread 51 of the union nut 50 is screwed onto the male thread 63 of the joint member 60. When the sleeve member 30 is first inserted into one end A of the tube 10, an expanded portion B is formed near one end A of the tube 10, where the outer diameter of the tube 10 is expanded. Therefore, by threading the union nut 50 onto the coupling member 60, a union joint structure is formed by the union nut 50 and the coupling member 60, with the expanded portion B serving as a union flange, and the tube 10 is fastened to the coupling member 60. The coupling member 60 corresponds to the union screw in the union joint structure. In this union joint structure, the tube 10 is sandwiched between the rear end surface 32 of the sleeve member 30 and the front end of the coupling member 60, forming a seal structure.

[0026] [Second embodiment] FIG. 4 shows the manufacturing process of an ion exchanger assembly according to the second embodiment. The states (a) to (i) in FIG. 4 correspond to the states (a) to (i) in FIG. 1, respectively. In particular, FIG. 4(f) shows the basic form of the assembly according to the second embodiment, and FIG. 4(i) shows the assembly according to the second embodiment with a union joint structure. The assembly according to the second embodiment differs from the assembly according to the first embodiment in that, when the sleeve member 30 is inserted into the end A of the tube 10, the rear end surface 32 of the sleeve member 30 protrudes beyond the end A of the tube 10. Therefore, a groove-shaped engaging portion 35 for receiving the end A of the tube 10 is formed on the outer periphery of the sleeve member 30 between the ridge portion 34 and the rear end surface 32. Furthermore, the engaging portion 62 of the coupling member 60 is also formed to receive the portion of the sleeve member 30 that protrudes beyond the end A of the tube 10. Except for these differences, the assembly according to the second embodiment is formed using the same procedure as the first embodiment. Naturally, the assembly of the second embodiment can also be used as an ion exchange device by itself.

[0027] [Third embodiment] In the first and second embodiments, the union joint structure is formed using both the sleeve member 30 and the coupling member 60. In the third embodiment, however, the coupling member 60 itself functions as the sleeve member. FIG. 5 shows, in sequence, the manufacturing process of the ion exchanger assembly of the third embodiment and the manufacturing process of the union joint structure incorporating this assembly. In this embodiment, even without using a sleeve member, it is necessary to pre-flare the tube 10 so that the outer diameter of the tube 10 expands near one end A of the tube 10. In FIG. 5, (a) shows the tube 10 before flaring, and (b) shows the tube 10 after flaring. By performing the flaring, a flare 15, in which the inner and outer diameters are expanded, is formed at one end A of the tube 10.

[0028] Next, the coupling member 60 is inserted into the flare 15 of the tube 10 so as to abut against the inner wall of the tube 10. In this embodiment, the coupling member 60 is composed of a tip portion 65 that is inserted into the flare 15 and abuts against the inner wall of the tube 10, and a main body portion 66 having a male thread portion 63 formed on its outer periphery. The flow path 61 is formed to penetrate both the tip portion 65 and the main body portion 66. A tip surface 67 is formed at the tip of the tip portion 65. In FIG. 5, (c) shows the tube 10 before the coupling member 60 is inserted, and (d) shows the state in which the coupling member 60 has been inserted into the flare 15 of the tube 10. When the coupling member 60 is inserted into the flare 15 of the tube 10, a step is formed between the inner wall of the tube 10 and the tip surface 67 of the coupling member 60.

[0029] Next, the perforated plate 40 is inserted into the tube 10 from the other end thereof so as to abut against the step formed by the tip end surface 67 of the coupling member 60 and the inner wall of the tube 10. In FIG. 5, (e) shows the state in which the perforated plate 40 is being moved toward the step using a push rod 70, which is a jig, and (f) shows the state in which the perforated plate 40 has been placed on the step. Subsequently, the organic porous ion exchanger 20 is inserted into the tube 10 from the other end thereof so as to abut against the perforated plate 40. In FIG. 5, (g) shows the state in which the organic porous ion exchanger 20 is being moved toward the perforated plate 40 using the push rod 70, which is a jig, and (h) shows the state in which the placement of the organic porous ion exchanger 20 has been completed and the assembly of the third embodiment has been completed.

[0030] When the assembly shown in Fig. 5(h) is used as a union joint structure, a union nut 50 similar to that used in the first and second embodiments is prepared as shown in Fig. 5(i). Then, as shown in Fig. 5(j), the female thread portion 51 of the union nut 50 is threaded onto the male thread portion 63 of the coupling member 60, thereby completing the union joint structure. At this time, the flare 15 of the tube 10, which is supported by abutting against the tip portion 65 of the coupling member 60, functions as a union flange. [Explanation of symbols]

[0031] 10 tubes 11 PFA Department 12 Conductive PFA section 15 Flare 20 Organic porous ion exchanger 30 Sleeve member 31 Tip surface 32 Rear end surface 33 Flow path 34 Ridgeline 40 Perforated board 35 Engagement part 41 Through hole 50 union nut 51 Female thread 60 Joint member 61 Flow path 62 Engagement part 63 Male thread 65 Tip part 66 Main body part 67 Tip surface 70 Push Rod

Claims

1. A plastic tube and a resin sleeve member that is inserted into one end of the tube and has a flow path therethrough that allows liquid to flow out of the tube; a resin perforated plate having a through hole and disposed inside the tube so as to abut against a step formed by an inner wall of the tube and the tip end surface of the sleeve member; an organic porous ion exchanger disposed in the tube on the opposite side of the one end with the perforated plate therebetween; Equipped with The assembly includes a perforated plate that prevents the organic porous ion exchanger from falling out of the tube.

2. 2. The assembly according to claim 1, wherein said tube, said sleeve member and said perforated plate are formed from a material selected from the group consisting of fluororesin, polytetrafluoroethylene, polyethylene and polypropylene.

3. 3. The assembly according to claim 2, wherein the tube is made of a fluororesin having a layer containing a conductive material provided on at least a portion of an outer wall thereof.

4. a union nut provided so that the tube passes through; a coupling member with which the one end of the tube or the sleeve member protruding from the one end can be engaged, and which has a thread groove formed on its outer periphery that engages with the union nut; Furthermore, the tube has an expanded portion whose outer diameter is expanded by inserting the sleeve member into the expanded portion; 4. The assembly according to claim 1, wherein the tube is fixed to the coupling member by forming a union joint structure between the union nut and the coupling member, with the enlarged portion serving as a union flange.

5. a union nut through which the tube passes and which is slidable along the tube; The one end of the tube is flared so that the inner diameter and the outer diameter thereof increase, the sleeve member is a coupling member including: a tip portion that is inserted into the flared portion of the tube and abuts against the inner wall of the tube; and a main body portion having a thread groove formed on an outer periphery thereof that engages with the union nut, 4. The assembly according to claim 1, wherein the flared portion serves as a union flange, and the union nut and the coupling member form a union coupling structure, and the tube is fixed to the coupling member.

6. A method for manufacturing the assembly according to any one of claims 1 to 3, comprising the steps of: an inserting step of inserting the sleeve member into the one end of the tube; a first positioning step of inserting the perforated plate into the tube from the other end of the tube so as to abut against the step portion after the insertion step; a second disposing step of inserting the organic porous ion exchanger into the tube from the other end of the tube so that the organic porous ion exchanger abuts against the perforated plate after the first disposing step; A manufacturing method comprising the steps of:

7. A method for manufacturing the assembly of claim 4, comprising the steps of: an inserting step of inserting the sleeve member into the one end of the tube; a first positioning step of inserting the perforated plate into the tube from the other end of the tube so as to abut against the step portion after the insertion step; a second arranging step of inserting the organic porous ion exchanger into the tube from the other end of the tube so that the organic porous ion exchanger abuts against the perforated plate after the first arranging step; and an engaging step of engaging the one end of the tube or the sleeve member protruding from the one end with the coupling member after the second arranging step. a fastening step of screwing the union nut into the thread groove after the engaging step; A manufacturing method comprising the steps of:

8. A method for manufacturing the assembly according to claim 5, comprising the steps of: a flaring process for flaring the one end of the tube; an insertion step of inserting the tip portion of the sleeve member into the flared portion after the flaring step; a first positioning step of inserting the perforated plate into the tube from the other end of the tube so as to abut against the step portion after the insertion step; a second arranging step of inserting the organic porous ion exchanger into the tube from the other end of the tube so that the organic porous ion exchanger abuts against the perforated plate after the first arranging step; and a fastening step of screwing the union nut into the thread groove after the second arranging step. A manufacturing method comprising the steps of:

9. An ion exchange device that performs ion exchange treatment on a liquid to be treated, An assembly according to any one of claims 1 to 3, An ion exchange device in which the liquid to be treated flows from the other end of the tube toward the one end.

10. 10. The ion exchange apparatus according to claim 9, wherein the liquid to be treated is an organic solvent.

Images