JP2003159517A - Hollow fiber separation membrane module - Google Patents

Abstract

(57) [Problem] To provide a hollow fiber separation membrane module with improved pressure resistance of a tube sheet. SOLUTION: The present invention comprises at least a hollow fiber bundle composed of a large number of hollow fiber separation membranes, a tube sheet to which the hollow fiber bundle is fixed and embedded, and a container for accommodating them. In the hollow fiber separation membrane module, the pressure receiving surface where the tube sheet and the container are in contact with each other and pressure is applied during use is tapered such that the tube sheet diameter decreases from the high pressure side to the low pressure side. A hollow fiber separation membrane module characterized in that the taper is formed at an angle of 25 ° to 60 ° with respect to the direction of the pressure applied to the tube sheet. A hollow fiber separation membrane characterized in that the tube sheet has an outer peripheral portion in which the hollow fiber bundle having a thickness of 3 mm or more is not embedded on the outer periphery of the hollow fiber bundle embedded in the tube sheet. About the module.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a hollow fiber separation membrane module having improved pressure resistance and durability. In particular, the present invention relates to improvement of pressure resistance and durability of a tube sheet in a hollow fiber separation membrane module to which high-pressure gas or a mixed gas of high pressure and high temperature is supplied.

[0002]

2. Description of the Related Art A hollow fiber separation membrane module usually comprises a hollow fiber bundle containing hundreds to hundreds of thousands of hollow fibers having selective permeability, and a hollow fiber bundle at least one end of the hollow fiber bundle. At least a mixture supply port and a permeate containing at least one hollow fiber separation membrane element including a resin-made tube plate in which the hollow fiber bundle is embedded and fixed so that the yarn maintains an open state. In a container provided with a discharge port and a non-permeate discharge port, a space communicating with the inside of the hollow fiber and a space communicating with the outside of the hollow fiber are mounted so as to be isolated from each other.

1 and 2 are schematic views (cross-sectional views) showing typical forms of hollow fiber separation membrane modules. FIG. 1 is a hollow feed type module in which the supplied mixture leads to the inside of the hollow fiber. When the high pressure mixture is supplied, the container 1
The space surrounded by the tube sheet 4 and the tube sheet 4 and facing the mixture supply port 5, the inside of the hollow fiber, and the space surrounded by the container 1 and the tube sheet 4 ′ and facing the non-permeate discharge port 6 are on the high pressure side. On the other hand, the space outside the hollow fiber, which is surrounded by the container 1 and the two tube plates 4 and 4 ′ and faces the permeate discharge port 7, becomes the low-pressure side. Pressure is applied to the tube plate from the high pressure side.

FIG. 2 shows a shell-feed type module in which the supplied mixture communicates with the outside of the hollow fiber. When the high-pressure mixture is supplied, the space outside the hollow fiber, which is surrounded by the container 1 and the two tube plates 4, 4 ′ and faces the mixture supply port 5 and the non-permeate discharge port 6, becomes the high-pressure side, On the other hand, the inside of the hollow fiber and the two spaces surrounded by the container 1 and the tube sheets 4 and 4 ′ and facing the permeate discharge ports 7 and 7 ′ are on the low pressure side. Pressure is applied to the tube plate from the high pressure side.

There are various means for securely attaching the tubesheet to the container and preventing misalignment. One of them is to make unevenness at the position where the container and the tube sheet come into contact,
This is a method of fitting by fitting with the tube sheet. FIG. 3 shows a schematic diagram (cross-sectional view) of the contact portion between the container and the tube sheet. This method is preferable because it is easy to manufacture. However, in this method, in the case of the hollow feed, concentrated stress is generated in the tube sheet in the vicinity of the corner portion of the B surface and in the case of the shell feed in the vicinity of the corner portion of the A surface, cracks are likely to occur and There is a problem that the pressure resistance of the device becomes low. In particular, cracks may occur in the tube sheet when the diameter of the tube sheet is large in a large module, when the conditions such as pressure and temperature during use are severe, or when it is used continuously or intermittently for a long period of time. Therefore, there is a demand for a hollow fiber separation membrane module with a higher pressure resistance of the tube sheet.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a hollow fiber separation membrane module having improved pressure resistance and durability of a tube sheet.

[0007]

Means for Solving the Problems In a hollow fiber separation membrane module provided with irregularities at a position where a container and a tube sheet are in contact with each other and fitted by fitting the container and the tube sheet, the hollow fiber separation membrane module is Under the pressure, stress is generated in the tube sheet to cause strain. This stress and strain are not uniform in each part of the tube sheet, and are concentrated in a certain part to generate maximum stress and maximum strain. When the maximum stress and the maximum strain exceed the mechanical strength of the tube sheet, cracks occur in the tube sheet.

As a result of various studies on the shape and form of the tube sheet, the inventors of the present invention have found a tube sheet shape capable of suppressing concentrated stress and strain. Further, they have found that the hollow fiber separation membrane module having the tube sheet form is excellent in pressure resistance and durability, and arrived at the present invention. That is, the present invention is configured to include at least a hollow fiber bundle composed of a large number of hollow fiber separation membranes, a tube plate in which the hollow fiber bundles are fixed and embedded, and a container for storing them. In the hollow fiber separation membrane module, the pressure receiving surface to which pressure is applied during use, which is the surface where the tube sheet and the container are in contact, is tapered so that the tube sheet diameter decreases from the high pressure side to the low pressure side, Further, the present invention relates to a hollow fiber separation membrane module characterized in that its tapered surface is formed at an angle of 25 ° to 60 ° with respect to the direction of pressure applied to the tube sheet. The hollow fiber separation membrane is characterized in that the tube sheet has an outer peripheral portion in which the hollow fiber bundle having a thickness of 3 mm or more is not embedded, on the outer circumference of the hollow fiber bundle embedded in the tube sheet. Regarding modules.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the hollow fiber separation membrane module of the present invention are listed below. 1) The pressure receiving surface, which is the surface where the tube sheet and the container are in contact with each other and receives pressure during use, is tapered so that the tube sheet diameter decreases from the high pressure side to the low pressure side, and the tapered surface The (pressure receiving surface) is at an angle of 25 ° to 60 ° with respect to the direction of pressure applied to the tube sheet, particularly preferably 25 ° to 45 °.
Is formed with an angle of. 2) The tube sheet is 3 m on the outer circumference of the hollow fiber bundle embedded in the tube sheet.
It has an outer peripheral portion that does not embed a hollow fiber bundle having a thickness of m or more, preferably 3 mm to 30 mm, particularly preferably 5 mm to 20 mm. 3) The inner surface of the container is provided with a protrusion that serves as a guide for adjusting the thickness of the outer peripheral portion of the tube sheet that does not embed the hollow fiber bundle to a specified dimension. 4) The pressure receiving surface (tapered surface) forms one surface of the protrusion. 5) The tube sheet material is a thermosetting resin, particularly preferably an epoxy resin material. 6) A large hollow fiber separation membrane module having an outer diameter of the tube sheet of 20 cm or more. 7) A hollow fiber gas separation membrane module that selectively permeates at least one gas from a mixed gas. 8) A hollow fiber separation membrane module for separating and recovering either enriched nitrogen air, enriched oxygen air, dry air, carbon dioxide, hydrogen, or organic vapor. 9) A hollow fiber gas separation membrane module comprising an asymmetric polyimide hollow fiber membrane. 10) A concave groove is formed circumferentially on the inner surface of the cylindrical container where the tube plate is located, the tube plate is formed so as to fit in the concave groove, and the pressure receiving surface forming the concave groove is arranged from the high pressure side. The taper surface is tapered such that the diameter of the tube sheet decreases toward the low pressure side, and the tapered surface has an angle of 25 ° to 60 ° with respect to the direction of pressure applied to the tube sheet. However, it forms one surface of the protrusion that serves as a guide for adjusting the thickness of the outer peripheral portion of the tube sheet that does not embed the hollow fiber bundle to a predetermined dimension.

The hollow fiber separation membrane module of the present invention comprises at least a hollow fiber bundle composed of a large number of hollow fiber separation membranes, a tube sheet in which the hollow fiber bundles are fixed and embedded, and a container for storing them. In a hollow fiber separation membrane module configured to include a tube sheet and a container, the pressure receiving surface, to which pressure is applied during use, is a tube sheet diameter that decreases from the high pressure side to the low pressure side. It is a taper, and
The taper surface is 25 against the direction of pressure applied to the tube sheet.
It is configured with an angle of 60 °. The pressure receiving surface is a surface where the tube sheet and the container (outer shell or inner shell) are in contact with each other, and is a surface which receives pressure when the tube sheet is pressed against the container by the pressure of the feed mixture during use.

In the present invention, the pressure receiving surface of the tube sheet is tapered so that the tube sheet diameter decreases from the high pressure side to the low pressure side, thereby suppressing the occurrence of concentrated stress and strain. Specifically, when the pressure receiving surface is formed to have an angle of 25 ° to 60 °, particularly 25 ° to 45 ° with respect to the direction of the pressure received by the tube sheet, the occurrence of concentrated stress is effectively suppressed. It is possible to significantly improve the pressure resistance of the tube sheet. Two
When the angle is less than 5 ° or more than 60 °, the concentrated stress generated in the tube sheet cannot be sufficiently suppressed,
This is not preferable because cracks easily occur in the tube sheet.
Further, in the hollow fiber separation membrane module of the present invention, the portions of the tube plate corresponding to both ends of the pressure receiving surface are each 90 °.
The occurrence of cracks is also suppressed by the obtuse angle of 270 ° or more.

In order to improve the pressure resistance of the tube sheet, the unevenness of the contact portion between the container and the tube sheet is increased to widen the pressure receiving surface,
It is conceivable to increase the thickness of the tube sheet in the pressure direction that the tube sheet receives. However, even if the pressure receiving surface is widened or the tube sheet is thickened, the partial concentrated stress cannot be suppressed, so that the pressure resistance cannot be significantly improved. Moreover, if the irregularities are increased or the tube sheet is thickened, the outer dimension of the container is increased, and it is difficult to obtain a compact hollow fiber separation membrane module, which is not preferable.

Further, in the hollow fiber separation membrane module of the present invention, the tube sheet is 3 m on the outer circumference of the hollow fiber bundle embedded in the tube sheet.
m or more, preferably 3 to 30 mm, particularly 5 to 20 mm
It is preferable to have an outer peripheral portion in which the hollow fiber bundle having the thickness (thickness) is not embedded. A relatively large stress is likely to be generated in the outer peripheral portion of the hollow fiber bundle in the tube sheet, and if the thickness of this portion is less than 3 mm, cracking easily occurs in the minimum thickness portion, which is not preferable. When the thickness of the outer peripheral portion exceeds 30 mm, the outer dimension of the container becomes large and a compact hollow fiber separation membrane module cannot be obtained, which is not preferable.

Further, a protrusion having a role of a guide for adjusting the thickness (wall thickness) of the outer peripheral portion of the hollow fiber bundle of the tube sheet not embedding the hollow fiber bundle to a predetermined dimension is provided. It is preferable to provide it on the inner surface of the container because the protrusion prevents the hollow fiber bundle from spreading to the outer peripheral portion, and the wall thickness of the outer peripheral portion can be easily and surely made equal to or larger than a predetermined dimension. Therefore, it is preferable to dispose the protrusion in the vicinity of the tube sheet.
In particular, this protrusion is provided in the vicinity of the pressure receiving surface that receives pressure during use, and the thickness (wall thickness) of the outer peripheral portion of the tube sheet in the vicinity of the pressure receiving surface where the hollow fiber bundle is not embedded is set to a predetermined value or more. It is effective to suppress the generation of cracks. Furthermore, if the taper pressure-receiving surface forms one surface of the protrusion that serves as a guide for making the outer peripheral portion of the tube sheet that does not embed the hollow fiber bundle a predetermined thickness, It is preferable because it is simple and compact and manufacturing is easy.

In the hollow fiber separation membrane module of the present invention, the container is provided with at least a mixture supply port, a permeate discharge port, and a non-permeate discharge port, and a hollow fiber element consisting of a hollow fiber bundle and a tube plate is provided therein. It is not particularly limited as long as it can be housed and fixed and the space communicating with the inside of the hollow fiber and the space communicating with the outside of the hollow fiber can be isolated. It may be composed of a tubular object having one end or both ends opened and a cap that covers the opening at one end or both ends,
It may be composed of a box and a cap that covers the opening. Further, the container may have a double structure of an inner jacket for mounting the hollow fiber separation membrane element and an outer jacket for accommodating the inner jacket mounting the hollow fiber element. In the case of the dual structure of the outer jacket and the inner jacket, the inner jacket is provided with irregularities, and the irregularities are attached so that the tube sheet of the hollow fiber element to be fitted fits. A large module is often composed of a cylindrical container whose both ends are open and a cap which covers the openings at both ends.

In the hollow fiber separation membrane module of the present invention, as the hollow fiber membrane, a hollow fiber membrane formed of a material suitable for an object to be separated and separation conditions can be preferably used. For example, polyolefin, polybutadiene, silicone resin, cellulosic polymer, polyamide, polysulfone,
Polyimide, polyether imide, polyamide imide,
Elastomer materials such as polyetheretherketone, polyphenylene sulfide, polyarylate, polycarbonate, etc. or glassy polymer materials may be used.
It may be a ceramic material such as zeolite, a carbon material, a material obtained by partially carbonizing a polymer, a rigid polymer material such as a cardo type polyimide, or a composite material containing the above material. Further, the hollow fiber separation membrane of the present invention may be homogenous or heterogeneous such as a composite membrane or an asymmetric membrane,
It may be porous or non-porous. The hollow fiber separation membrane has a thickness of 10 to 500 μm and an outer diameter of 50 to 20 μm.
Those having a diameter of 00 μm can be preferably mentioned.

In the application in which the mixture gas is supplied under high pressure, the stress generated in the tube sheet becomes extremely large. Therefore, the hollow fiber separation membrane of the present invention in which the occurrence of concentrated stress is suppressed and the pressure resistance of the tube sheet is improved. Extremely useful. For example, when air is supplied to the mixture supply port of the hollow fiber separation membrane module to obtain enriched nitrogen air from the non-permeate outlet and / or enriched oxygen air from the permeate outlet, the air is adjusted to 0. 05-20MP
Supply at a high pressure of a (gauge pressure). When such high-pressure air is supplied, the hollow fiber separation membrane module of the present invention is extremely suitable. When supplying a mixed gas of water vapor and organic vapor obtained by heating a water-containing organic solvent to a high temperature and recovering dehydrated organic vapor from the non-permeate discharge port, supply the supply gas under high pressure and high temperature. To do. In this case, in addition to the stress generated by the pressure, the stress generated by the expansion and contraction due to the temperature is applied, so that a large stress is easily generated in the tube sheet. The hollow fiber separation membrane of the present invention, in which stress concentration is suppressed and the pressure resistance and durability of the tube sheet are improved, can be suitably used in such a case. The hollow fiber separation membrane module of the present invention can be preferably used for separation and recovery of dry air, carbon dioxide, hydrogen and the like in addition to the enriched nitrogen air, enriched oxygen air and organic vapor. Furthermore, for the hollow fiber separation membrane module used for the above-mentioned applications, an asymmetric hollow fiber membrane made of polyimide, which has a high separation coefficient of the gas to be separated and is excellent in pressure resistance and heat resistance, can be preferably used. .

In the hollow fiber separation membrane module of the present invention, one or more of the above hollow fiber separation membrane elements are housed in a container so as to have at least a mixture supply port, a permeate discharge port, and a non-permeate discharge port. It is composed. The form of the module is not particularly limited. It may be a hollow feed type or a shell feed type, and may be a type using a carrier gas or a type not using a carrier gas. In the type using a carrier gas, a carrier gas introduction port is arranged in the container or a carrier gas introduction pipe is arranged in the element. The carrier gas introducing pipe may be a core pipe arranged at substantially the center of the hollow fiber bundle.

The hollow fiber separation membrane module can take various forms depending on the shape of the hollow fiber separation membrane element to be housed and the arrangement of the mixture supply port, the permeate discharge port, the non-permeate discharge port, and the like. For example, it may be cylindrical or box-shaped. In any case, in the module, the spaces communicating with the inside and outside of the hollow fiber separation membrane are isolated from each other, and the supplied fluid is supplied from the module mixture supply port to either the inside or the outside of the hollow fiber. Introduced to the side, flowing while contacting the surface of the membrane, discharged from the unpermeate outlet to the outside of the module, the components selectively permeating the intervening membrane are permeated to the space on the opposite side (permeation side) of the membrane. It is configured to be discharged from the module to the outside of the module. Further, in the hollow fiber separation membrane module of the present invention, the container, core tube, etc. are not particularly limited as long as they have predetermined strength, airtightness and pressure resistance, and metal materials such as stainless steel, plastic materials, fiber reinforced plastics. Material, or
It can be formed of a ceramic material or the like. Also, if necessary, an adhesive, bolts and nuts, packings, and the like are used.

An example of an embodiment of the present invention will be described below with reference to a schematic cross-sectional view. In addition, these figures show the vicinity of the contact portion between the container and the tube sheet, which is a feature of the present invention. The present invention is not limited to this form. Figure 4
Is an example of a hollow feed type of the hollow fiber separation membrane module of the present invention. A cylindrical groove is provided on the inner side of the cylindrical container, and a tube sheet is formed by fitting the groove into the groove. When this hollow fiber separation membrane module is used, the space 10 is the high pressure side and the space 11 is the low pressure side. The pressure receiving surface 9 is tapered so that the diameter of the tube sheet becomes smaller on the low pressure side than on the high pressure side. The direction of the pressure applied to the tube sheet is as indicated by the broken line arrow shown on the cross-sectional view, so that the pressure receiving surface (tapered surface) 9 is 25 ° to 60 ° with respect to the arrow.
It is formed to intersect at an angle of °.

FIG. 5 shows an example of the shell feed type of the hollow fiber separation membrane module of the present invention. A cylindrical groove is provided on the inner side of the cylindrical container, and a tube sheet is formed by fitting the groove into the groove. When this hollow fiber separation membrane module is used, the space 10 is the high pressure side and the space 11 is the low pressure side. The pressure receiving surface 9 is tapered so that the diameter of the tube sheet becomes smaller on the low pressure side than on the high pressure side. The direction of the pressure applied to the tube sheet is as shown by the dashed arrow shown on the cross-sectional view, so that the pressure receiving surface (tapered surface) 9 has an angle of 25 ° to 60 ° with respect to the arrow. Are formed so as to cross each other. Also, there is a protrusion 8 on the inner surface of the container,
It serves as a guide for making the outer peripheral thickness (wall thickness) 12 of the outer periphery of the hollow fiber bundle in which the tube sheet is embedded not embedded in the hollow fiber bundle a predetermined dimension of 3 mm or more.

FIG. 6 shows an example of the hollow feed type of the hollow fiber separation membrane module of the present invention. There is a concave groove on the inner circumference of the cylindrical container, and the tube sheet is formed by fitting into the concave groove. When this hollow fiber separation membrane module is used, the space 10 is the high pressure side and the space 11 is the low pressure side. The pressure receiving surface 9 is tapered so that the diameter of the tube sheet becomes smaller on the low pressure side than on the high pressure side. The pressure receiving surface (tapered surface) 9 is 25 ° to the direction of pressure received by the tube sheet.
It is formed to have an angle of 60 °. Further, there is a protrusion 8 on the inner surface of the container so that the thickness 12 of the outer peripheral portion of the outer peripheral portion of the hollow fiber bundle in which the tube sheet is embedded does not embed the hollow fiber bundle is 3 mm or more. Plays the role of a guide. Moreover, the tapered surface forms one surface of the projection 8 having a role of a guide for making the thickness of the outer peripheral portion of the tube sheet, which does not embed the hollow fiber bundle, predetermined.

[0023]

EXAMPLES The present invention will be described below with reference to examples.
The present invention is not limited to the embodiments. (Calculation of safety factor by taper angle by simulation) It is housed in a cylindrical container, the outer diameter of the tube plate and the thickness in the pressure direction, the depth of the concave groove of the fitting portion, and the wall thickness of the outer peripheral portion (10 m
m), in a hollow feed type hollow fiber separation membrane module in which the hollow fiber bundle has the same form and only the angle formed by the pressure receiving portion taper and the pressure direction is different, the maximum stress generated in each tube sheet is used by a computer. Calculated by simulation. The high pressure side space was 1.4 MPa (gauge pressure), and the low pressure side space was 0 MPa (gauge pressure). Since the mechanical strength when the tube sheet is made of epoxy resin is known, the safety factor is defined as (mechanical strength of tube sheet) / (maximum stress generated in tube sheet). It was shown to. When the pressure receiving surface taper is at an angle of 90 ° or 20 ° to the pressure direction,
It can be seen that the safety factor is relatively low and there is a high risk of cracking when pressure is applied to the tube sheet. on the other hand,
It can be seen that the safety factor is extremely high when the angle is 30 ° or 45 °.

[Table 1] (Calculation of minimum thickness of outer peripheral part and generated strain by simulation) It is housed in a cylindrical container, the outer diameter of the tube sheet and the thickness in the pressure direction, the depth of the concave groove of the fitting part, the taper of the pressure receiving surface and the pressure direction. In the hollow feed type hollow fiber separation membrane module having the same angle (30 °) and the form of the hollow fiber bundle and different only in the minimum outer peripheral wall thickness, the strain (%) generated in each tube sheet ) Was calculated by simulation using a computer. The high pressure side space was 1.4 MPa (gauge pressure), and the low pressure side space was 0 MPa (gauge pressure). A known elastic modulus was used for the tube sheet as an epoxy resin. The obtained results are shown in Table 2. It can be seen that the strain increases when the minimum thickness of the outer peripheral portion is 1 mm.

[Table 2]

(Embodiment 1) A configuration similar to that of FIG.
Stored in a cylindrical container, the outer diameter of the tube sheet is 25 cm, the thickness in the pressure direction is 6 cm, the depth of the concave groove of the fitting part is 4.5 mm, the angle between the taper of the pressure receiving surface and the pressure direction is 30 °, and the outer circumference A hollow fiber separation membrane module having a wall thickness of 10 mm was prepared. The hollow fiber was an asymmetric polyimide hollow fiber membrane having an outer diameter of 400 μm, and the tube sheet was made of epoxy resin. A pressure resistance test was conducted by sealing the opening of the hollow fiber in the high pressure side space of this module and applying water pressure with a water pressure tester. After applying a water pressure of 10 MPa (gauge pressure) at maximum, the water was removed and the module was observed. No change was seen in the tube sheet. (Example 2) A hollow fiber separation membrane module similar to that of Example 1 was prepared except that the angle between the taper of the pressure receiving surface and the pressure direction was 45 °. When a pressure resistance test was conducted by sealing the opening of the hollow fiber in the high pressure side space of this module and applying a water pressure with a water pressure tester, a crack occurred in the tube sheet when the pressure exceeded 8 MPa (gauge pressure). did. (Comparative Example 1) A hollow fiber separation membrane module was prepared in the same manner as in Example 1 except that the angle formed between the taper of the pressure receiving surface of the tube sheet and the pressure direction was 90 °. When a pressure resistance test was performed using a hydraulic tester in the same manner as in Example 1, it was 4 MPa.
(Gauge pressure) caused a crack in the tube sheet. (Comparative Example 2) A hollow fiber separation membrane module similar to that of Example 1 was prepared except that the wall thickness of the outer peripheral portion of the tube sheet was 1 mm. When a pressure resistance test was performed using a hydraulic tester in the same manner as in Example 1, a crack was generated in the tube sheet at 1 MPa (gauge pressure).

[0025]

The present invention is as described above, and has the following effects. That is, the present invention is
It has a tube plate with significantly improved pressure resistance, and when the pressure of the supplied mixture is high, when the module is large,
It is possible to provide a hollow fiber separation membrane module having excellent durability even when conditions such as temperature are more severe, or when it is used for a long period of time or intermittently. Especially enriched nitrogen air,
It is possible to provide a large-sized hollow fiber separation membrane module having improved pressure resistance and durability, which is suitable for separating and recovering enriched oxygen air, dry air, carbon dioxide, hydrogen, or organic vapor.

[Brief description of drawings]

FIG. 1 is a reference diagram (cross-sectional view) for explaining an outline of the form of a hollow feed type hollow fiber separation membrane module.

FIG. 2 is a reference diagram (transverse cross-sectional view) for explaining the outline of the form of a shell feed type hollow fiber separation membrane module.

FIG. 3 is a reference diagram (transverse cross-sectional view) for schematically explaining the form of the contact portion between the container and the tube sheet.

FIG. 4 is a schematic cross-sectional view showing an example of a hollow feed type hollow fiber separation membrane module of the present invention.

FIG. 5 is a schematic cross-sectional view showing an example of the shell feed type of the hollow fiber separation membrane module of the present invention.

FIG. 6 is a schematic cross-sectional view showing an example of a hollow feed type hollow fiber separation membrane module of the present invention.

[Explanation of symbols]

1: Container 2: Hollow fiber membrane 3: Hollow fiber bundle 4, 4 ': Tube plate 5: Mixture supply port 6: Non-permeate discharge port 7, 7': Permeate discharge port 8: Protrusion 9: Tapered Pressure receiving surface 10: high pressure side space 11: low pressure side space 12: outer periphery of the embedded hollow fiber bundle outer peripheral portion of the tube sheet in which the hollow fiber bundle is not embedded

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 4D006 GA41 HA02 HA05 HA06 JA01C                       JA13A JA13C JA23Z JA25A                       JB06 KA12 MA01 MA06 MA30                       MA31 MB04 MB15 MB16 MC01                       MC03 MC05 MC11 MC22 MC47                       MC49 MC54 MC58 MC58X                       MC59 MC61 MC62 MC65 PA05                       PB62 PB63 PB64 PB66 PB70

Claims (7)

[Claims] 1. A hollow structure including at least a hollow fiber bundle composed of a large number of hollow fiber separation membranes, a tube sheet in which the hollow fiber bundles are fixed and embedded, and a container for housing them. In the yarn separation membrane module, the pressure receiving surface to which pressure is applied during use, which is the surface where the tube sheet and the container are in contact, is tapered such that the tube sheet diameter decreases from the high pressure side to the low pressure side, and The hollow fiber separation membrane module is characterized in that its tapered surface is formed at an angle of 25 ° to 60 ° with respect to the direction of pressure applied to the tube sheet. 2. The tube sheet has an outer peripheral portion in which the hollow fiber bundle having a thickness of 3 mm or more is not embedded, on the outer periphery of the hollow fiber bundle embedded in the tube sheet. The hollow fiber separation membrane module according to claim 1. 3. A container is provided with a protrusion having a role of a guide for adjusting the thickness of the outer peripheral portion of the tube sheet, which is not embedded in the hollow fiber bundle, to a predetermined size. The hollow fiber separation membrane module according to any one of claims 1 to 2, wherein 4. A taper pressure-receiving surface forms one surface of a protrusion having a role of a guide for adjusting the thickness of the outer peripheral portion of the tube sheet not embedding the hollow fiber bundle to a predetermined dimension. The hollow fiber separation membrane module according to any one of claims 1 to 3, wherein 5. The hollow fiber separation membrane module according to claim 1, wherein the tube sheet material is a thermosetting resin. 6. Enriched nitrogen air, enriched oxygen air, dry air,
The hollow fiber separation membrane module according to any one of claims 1 to 5, wherein any one of carbon dioxide, hydrogen, and organic vapor is separated and recovered. 7. A hollow fiber bundle composed of at least a large number of asymmetric polyimide hollow fiber separation membranes, an epoxy resin tube sheet in which the hollow fiber bundles are fixed and embedded, and a cylindrical container for housing them. In a hollow fiber separation membrane module configured to include a tubular groove of the container is formed on the inner surface in which the tubular plate is located, the tubular plate is formed so as to fit into the concave groove, the concave groove The pressure receiving surface that constitutes is tapered so that the tube sheet diameter decreases from the high pressure side to the low pressure side, and the taper surface forms an angle of 25 ° to 60 ° with respect to the direction of the pressure applied to the tube sheet. And the tapered surface forms one surface of the protruding portion that has a role of a guide for making the thickness of the outer peripheral portion of the tube sheet that does not embed the hollow fiber bundle a predetermined dimension. The hollow fiber separation membrane module characterized by the above.