JP2002018244A - Hollow fiber membrane module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hollow fiber membrane module, wherein a hollow fiber membrane bundle is divided by a partition plate, generating no peeling between the hollow fiber membrane bundle and an adhesive even if load operation is performed. SOLUTION: In the hollow fiber membrane module, the partition plate 3 is inserted in the bonded and fixed part of the end part of the hollow fiber membrane bundle 2. The dimension in the cross-sectional direction of the module of the partition plate is equal to that of the hollow fiber membrane bundle at the end surface of the hollow fiber membrane bundle and at least a part of the remaining part in the length direction of the module has a dimension equal to the inner diameter of a module case.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a hollow fiber membrane module used for separating and supplying various substances.

[0002]

2. Description of the Related Art When fixing an end of a hollow fiber membrane module to a case with an adhesive, a hollow fiber membrane bundle in which the opening at the end is closed in advance with gypsum or the like so that both ends protrude from the case. Set, then set the bonding jig on the end of the case, inject the adhesive from the bonding jig, cut the end after the adhesive has hardened, and open the end of the hollow fiber membrane. And make modules. In the case of large modules, the temperature rise due to the heat generated by the curing of the adhesive is large, and the contraction of the curing agent is also large, so that the interface between the case and the adhesive or the interface between the hollow fiber membrane and the adhesive may peel off, In some cases, the strength of the bonded portion is not sufficient due to residual stress caused by curing shrinkage of the adhesive.

As a method for solving the above-mentioned problem in a large-sized module, a method is known in which a partition plate is put in an adhesive portion in advance, and a hollow fiber membrane bundle is divided and adhered.
No. 07 has been proposed. However, in a large module, the bundle of fibers hangs down due to the weight of the bundle of hollow fiber membranes.Therefore, the hollow fiber membrane bundle is deviated in the cross section of the module case, and the hollow fiber membranes are not evenly dispersed. And the portion where the hollow fiber membrane is dense has a large residual stress at the time of curing, and there is a possibility that the load at the time of filtration may cause separation between the hollow fiber membrane bundle and the adhesive.

As means for uniformly dispersing the divided hollow fiber membrane bundles, cutouts are provided at a certain depth at the outer edge of the partition plate, and the cutouts are bound with a string or the like. A bonding method has been devised in JP-A-6-226058. However, in a large-sized module, although the hollow fiber membranes are uniformly dispersed in the bundle and the partition plate and the hollow fiber membrane bundle are integrated, the hollow fiber membrane bundle is slightly unbalanced in the case. In particular, in a module in which the temperature rise due to the heat generated by the curing of the adhesive is relatively high, peeling may occur between the hollow fiber membrane bundle and the adhesive at the portion where the hollow fiber membrane bundle approaches the inner surface of the case. Further, it is disclosed that the partition plate is set so as to come to the center portion with a screw, and such an operation is complicated.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a large-sized module in which peeling does not occur between a hollow fiber membrane bundle and an adhesive even under load operation.

[0006]

Means for Solving the Problems The present inventor has conducted intensive studies to solve the above-mentioned problems. As a result, when a specific partition plate is used, there is no deviation of the hollow fiber membrane bundle in the bonding portion and sufficient bonding strength. It has been found that a large-sized module having the following can be realized, and the present invention has been accomplished. That is, the present invention provides a hollow fiber module in which a partition plate is inserted into an end adhesive fixing portion of a hollow fiber membrane bundle, wherein the size of the partition plate in the module cross-sectional direction is the same as that of the hollow fiber membrane bundle at the end surface of the hollow fiber membrane bundle. The present invention relates to a hollow fiber membrane module having the same size, and at least a part of the remaining portion in the length direction of the module has a size equivalent to the inner diameter of the module case.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below. The present invention makes it possible to arrange the hollow fiber membrane bundle of the bonded section of the module at the center by using a partition plate of a specific shape, and that the hollow fiber membrane bundle and the adhesive are bonded with sufficient strength. It concerns a large module.
This module is created by the following method. First, a specific partition plate is inserted into the end of the hollow fiber membrane bundle, and the partition plate and the periphery of the membrane bundle are bound with a thin tape and fixed. Next, after closing the end of the hollow fiber membrane bundle with a filler such as gypsum, the adhesive is sealed between the hollow fiber membrane bundle integrated with the partition plate and the module case and between the hollow fiber membrane bundles. , Fix. After the fixation, the end is cut so that the end of the hollow fiber is opened. At this time, it can be confirmed that the hollow fiber membrane bundle is adhered to the center of the case without bias.

In the present invention, the hollow fiber membrane bundle is divided and uniformly dispersed using a partition plate, and the partition plate is preferably divided into about 3 to 8 sections. If the number is less than three, the effect of suppressing the heat generation of the adhesive or the strength of the bonding part is small. If the number is more than eight, the number of hollow fiber membranes that can be inserted into the case is undesirably reduced. Further, it is more preferable that the partition plate has a shape in which four wings are combined so that the cross section forms a cross shape.

Regarding the size of the partition plate used in the present invention, the width of the partition plate (dimension in the section direction of the module) is partially equal to the inner diameter of the module case, and the remainder is equal to the diameter of the hollow fiber membrane bundle. Size. Here, the size equivalent to the inner diameter of the module case is within -5 mm from the inner diameter of the module case, and the size equivalent to the hollow fiber membrane bundle diameter is within ± 5 mm with respect to the hollow fiber membrane bundle diameter. More preferably, the size of both ends in the module length direction has a size equal to or smaller than the diameter of the hollow fiber membrane bundle, and the width of the central portion in the module length direction is equal to the inner diameter of the module case. It is preferable to have a suitable size. A more preferable embodiment is as shown in FIG. 2, in which the size in the module length direction is from the end of the hollow fiber membrane bundle (2) inserted into the module case (1) to the end of the module case. It is a length that does not exceed the end face of the first nozzle (6).

The size of the partition plate in the cross-sectional direction is equal to the diameter of the hollow fiber membrane bundle at the end face of the hollow fiber membrane bundle (2).
In the module case (1), the size is the same as the inside diameter of the case. At this time, the size may be the same as the inside diameter of the case, but it is smaller by about 5 mm than the inside diameter of the case. In this case, it is preferable that the distance L between the edge of the partition plate and the inner diameter of the case is about 2.5 mm. Here, the size equivalent to the inner diameter of the case is within -5 mm from the inner diameter of the case. This is because the sealing adhesive is located at a distance L between the partition plate (3) and the case (1).
This is because sealing can be performed more reliably if it exists.
The portion of the module case where the size of the partition plate is close to the inner diameter of the case is a length from the end face of the module case to the end face of the first nozzle (6). There may be. However, from the viewpoint of reducing material costs, the distance of the portion may be set to about 20 mm from the end of the module case, and the size of the rear portion may be reduced. However, in this case, it is preferable to reduce the size to a size close to the diameter of the hollow fiber membrane bundle (2).

The material of the partition plate used in the present invention is preferably bonded to an adhesive, and in general, the same material as the adhesive is preferable. The corners of the partition plate are preferably rounded in consideration of, for example, preventing damage to the hollow fiber membrane bundle.
The partition plate (3) used in the present invention and the divided hollow fiber membrane bundle (2) are preferably fixed so as to be integrated. The fixing jig includes a ring-shaped molded product, rubber band, taping, and the like. Used. Although these materials are not particularly limited, Teflon-based or PVC-based taping is preferable because of its high fixing effect. These are preferably in the part to be cut off after cutting.

Further, when inserting the integrated partition plate (3) and the hollow fiber membrane bundle (2) into the module case (1) and attaching the bonding jigs (4 and 5), the cup of the bonding jig is used. It is preferable that the inner diameter of (4) is equal to or larger than the diameter of the hollow fiber membrane bundle or within 10 mm, so that the partition plate and the hollow fiber membrane bundle can be reliably arranged at the center of the module case. Further, the depth of the cup (4) of the bonding jig is a depth capable of supporting the integrated partition plate and the hollow fiber membrane bundle, and the deeper the supporting force is, the smaller the amount of resin used. From the viewpoint, the depth is preferably about 35 mm. Further, it is preferable that the position of the end of the integrated partition plate and the end portion of the hollow fiber membrane bundle is in contact with the bottom of the cup (4) of the bonding jig or is close to within about 5 mm.

The material of the cup of the bonding jig is not particularly limited, but a resin having excellent moldability in a cup shape, such as polyethylene, polypropylene, or Teflon (registered trademark), is preferable, and the resin remaining when reuse is considered. It is preferable that the corner of the molded body is appropriately rounded for easy removal of the molded product. Although the size of the cross-sectional diameter of the target module is not limited, a module having a high heat generation of curing of 4 inches or more exhibits a higher effect. Furthermore, although not limited to the highest temperature at the time of curing, in particular, 90
A remarkable effect is seen in those reaching temperatures close to ° C.

In the present invention, the sealing method is not particularly limited, and for example, a centrifugal method or a stationary method can be applied. After sealing, the case is cut at a position slightly inserted from the end of the case, thereby completing the final form of the partition plate and the hollow fiber membrane bundle of the module. Therefore, depending on the cut-out position, the shape of the partition plate has lost part of the above-described form and the form described in the drawings. Supported at the center of the cross section,
The hollow fiber membrane bundle can be arranged at the center of the module bonding cross section. For this reason, the bias of the adhesive is eliminated, heat generation and shrinkage become uniform, and peeling does not occur between the hollow fiber membrane bundle and the adhesive even under load operation.

There is no restriction on the adhesive for sealing the module, and any known adhesive such as an epoxy resin or a urethane resin can be applied. Particularly, an epoxy resin shows a remarkable effect. In addition, a material having a high curing temperature has a high fixing effect, which is preferable. Further, the material of the case can be applied to thermoplastic resins such as polysulfone, hard vinyl chloride, ABS, polycarbonate, and polyphenylene sulfide. There is no restriction on the type of hollow fiber membrane used, and it can be applied to conventionally known hollow fiber membrane materials such as polyacrylonitrile, polysulfone, polyethylene, polypropylene, polyvinylidene fluoride, polyethersulfone, polyimide, polyamide and the like. Further, a composite film may be used.
There is no restriction on the diameter of the hollow fiber membrane or the thickness of the hollow fiber membrane bundle. Further, the present invention can be applied to various hollow fiber membranes such as a reverse osmosis membrane, an ultrafiltration membrane, and a microfiltration membrane. The present invention will be described based on examples.

[0016]

EXAMPLE 1 A bundle case made of a polysulfone resin hollow fiber membrane having an outer diameter of 1.1 mm and an inner diameter of 0.6 mm was placed in a module case having an inner diameter of 141 mm and a length of 1061 mm.
m, and the cross-sectional size is 110 mm, 136 mm, and consists of a tapered portion, and the lengths are 35 mm, 20 mm, and 20 m, respectively, as shown in FIG.
A cross-shaped partition plate having a total length of 75 mm and a thickness of 4 mm is inserted and set at the end of the hollow fiber membrane bundle. Furthermore, in order to integrate the partition plate and the divided hollow fiber membrane bundle,
A PVC tape is wound and fixed at the end from the cut surface (AB) in FIG. In this case, there is no residue on the module bonding portion of the final product. After cutting, the tape does not remain in the module.

After closing the openings at both ends of the hollow fiber membrane bundle with a filler such as gypsum, a cup (4) of an adhesive jig is attached to the end of the case (1) as shown in FIG. After fixing the cup with a holding jig (5) and fixing between the hollow fiber membrane and between the hollow fiber membrane and the case with an adhesive by a centrifugal bonding method,
When the end of the hollow fiber membrane bundle was opened by cutting from the 1 mm portion (AB) of the end of the case, the hollow fiber membrane bundle and the partition plate on the cut surface were arranged and fixed in the center of the case. I was At this time, the distance between the outer periphery of the hollow fiber membrane bundle and the inner surface of the case was about 15 mm in any case. Using this module, water temperature 90 ° C, module inlet pressure 0.32MP
a, When the load operation of performing the external pressure filtration under the condition of the outlet pressure of 0.29 MPa was performed for a required time period of 3 hours, no separation occurred between the hollow fiber membrane bundle and the adhesive.

[0018]

Comparative Example 1 Instead of using the partition plate shown in FIG. 1, as shown in FIG. 3, except that the size in the cross-sectional direction was all 110 mm, the same partition plate, module case,
Example 1 using a cup and a holding jig of an adhesive jig, and
A module was manufactured in the same manner as described above. As a result, on the cut surface of the module, the hollow fiber membrane bundle and the partition plate were fixed from the center, and the distance between the outer periphery of the hollow fiber membrane bundle and the inner surface of the case was 25 mm at the maximum and 5 mm at the minimum. In this case, no tape remains on the module bonding portion of the final product. Using this module, the load operation was performed in the same manner as in Example 1 except for the operation time. As a result, when the operation time was 1 hour, the distance between the outer periphery of the hollow fiber membrane bundle and the inner surface of the case was 5 mm, which was the minimum. Then, peeling occurred between the hollow fiber membrane bundle and the adhesive.

[0019]

COMPARATIVE EXAMPLE 2 Instead of using the partition plate shown in FIG. 1, as shown in FIG. 4, a notch (7) having a cross-sectional size of 110 mm and a depth of 13 mm at the outer edge in the longitudinal direction. , But using the same partition plate, module case, cup of adhesive jig, and holding jig as in Example 1, except that the hollow fiber divided from the partition plate was used. A module was manufactured in the same manner as in Example 1, except that the hollow fiber membrane bundle was bound using thin tape at the three cutout portions when the membrane bundle was integrated. As a result, the cut surface of the module was in the same state as Comparative Example 1. In this case, two tapes remain at the module bonding portion of the final product. When the load operation was performed using this module in the same manner as in Example 1 except for the operation time, the result was the same as that of Comparative Example 1.

[0020]

According to the present invention, the hollow fiber membrane bundle is arranged and fixed at the center of the module case, so that the hollow fiber membrane bundle and the adhesive do not peel off even under load operation. It has the effect of not occurring.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of the structure of a partition plate in the present invention.

FIG. 2 is a diagram illustrating an example of an inserted state of a partition plate according to the present invention, as viewed from above a nozzle.

FIG. 3 is a view showing a structure of a partition plate used in Comparative Example 1.

FIG. 4 is a view showing a structure of a partition plate used in Comparative Example 2.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Module case 2 Hollow fiber membrane bundle 3 Partition plate 4 Adhesive jig cup 5 Holding jig 6 Nozzle 7 Notch

Claims (1)

[Claims] In a hollow fiber module in which a partition plate is inserted into an end adhesive fixing portion of a hollow fiber membrane bundle, the size of the partition plate in the module cross-sectional direction is equal to that of the hollow fiber membrane bundle at the end face of the hollow fiber membrane bundle. A hollow fiber membrane module characterized in that at least a part of the remaining portion in the length direction of the module has a size equivalent to the inner diameter of the module case.