JP2010051844A - Hollow fiber membrane module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hollow fiber membrane module whose water gathering pipe does not come off from a part sealed with a resin during its production or operation. <P>SOLUTION: A bundle 13 of hollow fiber membranes is disposed around the circumference of a water gathering pipe 12 in a cylindrical case 11. A resin ring 20 is interposed between the end of the water gathering pipe 12 and the end of the bundle 13 of hollow fiber membranes each disposed in the end 15 of the hollow fiber membrane module unified with a sealing resin. By virtue of the action of the resin ring 20, the end of the water gathering pipe 12 does not come off from the part 15 sealed with the sealing resin. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hollow fiber membrane module used in various water treatment fields and a method for producing the same.

  The hollow fiber membrane module is generally composed of a casing having a fluid inlet / outlet, a cap, a hollow fiber membrane bundle, a net for protecting the hollow fiber membrane bundle, and a resin sealed portion in which the end of the hollow fiber membrane bundle is fixed by resin sealing. Many are configured. The processing stock solution or permeated water flows in and out, for example, the processing stock solution is filtered to the outside of the hollow fiber membrane from a hollow fiber membrane bundle that is resin-sealed and fixed at the upper end or lower end of the casing, and this filtrate is provided on the side of the casing. There are a method of flowing in and out from the inlet / outlet of the collected fluid and a method of collecting it in the central water collecting pipe.

US 2003/0150807 A1 US 6,183,639 B1

  The water collecting pipe provided at the center of the hollow fiber membrane bundle is cylindrical and is preferably as thin as possible from the viewpoint of increasing the filling rate of the hollow fiber membrane without changing the outer diameter of the membrane module. However, if it is thin, when the end of the hollow fiber membrane bundle sealed with the sealing resin is cut, a part of the water collecting pipe is easily peeled off from the resin sealed part or in the process of continuing operation. It may become. Thus, when a part of the water collecting pipe is peeled off from the sealing resin, the treatment liquid may leak to the permeate side.

  An object of the present invention is to provide a hollow fiber membrane module in which a water collecting pipe is not peeled off from a resin-sealed portion during production and operation, and a method for producing the same.

The present invention is a solution to the problem,
A water collecting pipe and a hollow fiber membrane bundle are accommodated in a cylindrical case, the hollow fiber membrane bundle is disposed around the water collecting pipe, and at least one end of the water collecting pipe and the hollow fiber membrane bundle are integrated with a sealing resin. Hollow fiber membrane module,
At the end integrated with the sealing resin, a resin ring is interposed between the water collection tube end and the hollow fiber membrane bundle end, and the water collection tube end and the hollow fiber membrane Provided is a hollow fiber membrane module in which a bundle end and the resin ring are integrated with the sealing resin, and a method for manufacturing the same.

  In the hollow fiber membrane module of the present invention, the water collecting tube and the hollow fiber membrane bundle are fixed and integrated through the resin ring, so that the water collecting tube may be peeled off from the resin sealing part during manufacturing and operation. Absent.

<Hollow fiber membrane module>
1 to 3, an embodiment of the hollow fiber membrane module of the present invention will be described. FIG. 1 is a longitudinal sectional view of a hollow fiber membrane module of the present invention, and FIG. 2 is a partially enlarged view of FIG. 3A to 3D are perspective views of four types of resin rings that can be used in the present invention.

  In the hollow fiber membrane module 10, a water collection pipe 12 and a hollow fiber membrane bundle 13 are accommodated in a cylindrical case 11.

  The water collecting pipe 12 has a plurality of water collecting ports 14 on the circumferential surface facing the hollow fiber membrane bundle 13, and the hollow fiber membrane bundle 13 is disposed around the water collecting pipe 12.

  The cylindrical case 11 and the water collecting pipe 12 may be made of resin or metal such as polyvinyl chloride, ABS resin, acrylic resin, polycarbonate, and polypropylene.

  The inner peripheral wall in the vicinity of the opening of the water collecting pipe 12 may form an internal structure (for example, a screw thread for screwing and a step for fitting) that can be connected to another member, for example, a pipe. it can.

  Both ends of the water collecting pipe 12 and the hollow fiber membrane bundle 13 are integrated with a sealing resin at a resin sealing portion 15 together with a resin ring 20 disposed therebetween. At this time, the outer peripheral surface of the resin ring 20 and the hollow fiber membrane bundle 13 are fixed, and the inner peripheral surface of the resin ring 20 and the outer peripheral surface of the water collecting pipe 12 are fixed.

  As the sealing resin used to form the resin sealing portion 15, urea resin adhesive, melamine resin adhesive, phenol resin adhesive, resorcinol resin adhesive, epoxy resin adhesive, polyurethane adhesive, vinyl urethane adhesive Among these, polyurethane adhesive is preferable.

  In FIG. 2, the end surface of the resin ring 20 forms the same surface as the end surface of the hollow fiber membrane bundle 13, but the end surface of the resin ring 20 is about 2 to 10 mm from the end surface of the hollow fiber membrane bundle 13. It may be fixed in a state of being retracted inside.

  The hollow fiber membrane module 10 can be covered with caps having liquid inlets and outlets at both ends, as in the known hollow fiber membrane module as shown in FIG. 1 of US2003 / 0150807. Reference numeral 16 denotes a member for fixing with a cap.

  As the resin ring 20, a cylindrical shape having a low height as shown in FIGS. 3A to 3D can be used, and the length is in the range of 40 to 120 mm and the thickness is in the range of 2 to 10 mm. It is preferable to do.

  The resin ring 20A shown in FIG. 3 (A) has a low cylindrical shape, and no holes or the like are formed in the peripheral wall surface.

  The resin ring 20B shown in FIG. 3 (B) has the same outer shape as that of FIG. 3 (A), but has a large number of holes 21 on the peripheral surface. When the water collecting pipe 12 and the hollow fiber membrane bundle 13 are integrated with the sealing resin using the resin ring 20B, the sealing resin passes through the hole 21, so that the hollow fiber membrane bundle 13 and the resin ring 20 are joined. The strength is increased, and the bonding strength between the water collecting pipe 12 and the resin ring 20 is increased.

  The resin ring 20C shown in FIG. 3C has slits formed at four locations, and the length of about half of the outer peripheral wall is a pair of facing separation walls 21a and 21a ′ and a pair of facing walls. The separation walls 21b and 21b ′ are divided into four.

  The pair of separation walls 21a, 21a 'and 21b, 21b' have the same curved surface shape on the outer peripheral surface and the inner peripheral surface.

  The resin ring 20D shown in FIG. 3 (D) has slits formed at four locations, and the length of about half of the outer peripheral surface is opposed to a pair of opposing separation walls 23a and 23a '. The separation walls 23b and 23b ′ are divided into four.

  The separation wall 23b has a curved surface on the outer peripheral surface, but has a convex portion 24b protruding inward on the inner peripheral surface. The separation walls 23b ', 23a, 23a' also have similar convex portions not shown.

  When the water collecting tube 12 and the hollow fiber membrane bundle 13 are integrated with the sealing resin using the resin ring 20D, the resin is made by the action of the convex portions of the pair of separation walls 23b, 23b ′ and 23a, 23a ′. A gap is formed between the ring 20 </ b> D and the outer peripheral surface of the water collecting pipe 12, and the overall bonding strength is increased by the sealing resin that has entered through the slit.

  In the hollow fiber membrane module 10 of the present invention, since the hollow fiber membrane bundle 15, the resin ring 20, and the water collecting pipe 12 are integrated on the end surface sealed with resin, the water collecting pipe 12 is made thin. Even in the manufacturing and operation, the water collecting pipe 12 is not peeled off from the sealing resin.

<First manufacturing method of hollow fiber membrane module>
Next, an embodiment of a method for producing a hollow fiber membrane module of the present invention will be described.

  First, the water collecting pipe 12, the resin ring 20, and the hollow fiber membrane bundle 15 are arranged in this order, and their ends are integrated with a sealing resin.

  Next, the resin sealing portion 15 (that is, the end portion of the water collecting pipe 12, the resin ring 20, and the hollow fiber membrane bundle 15) is cut by a predetermined length with a slicer, and the end portion of the hollow fiber membrane bundle 13 is opened. Let At this time, since the water collecting pipe 12 and the hollow fiber membrane bundle 13 are fixed to the resin ring 20 by the sealing resin, the water collecting pipe 12 may be peeled off from the sealing resin by an external force at the time of cutting. Absent.

<The 2nd manufacturing method of a hollow fiber type membrane module>
Next, other embodiment of the manufacturing method of the hollow fiber type membrane module of this invention is described.

  First, the water collecting pipe 12, the resin ring 20, and the hollow fiber membrane bundle 15 are arranged in this order, and their ends are integrated with a sealing resin. At this time, sealing is performed such that the end face of the resin ring 20 is retracted inward from the end face of the hollow fiber membrane bundle 13.

  Next, the end portions of the water collection tube 12 and the hollow fiber membrane bundle 13 are cut by a predetermined length by a slicer, and the end portions of the hollow fiber membrane bundle 13 are opened. At this time, the end of the resin ring 20 retracted inward is not cut.

  The cutting may be performed such that the end face of the water collecting pipe 12 and the hollow fiber membrane bundle 13 and the end face of the resin ring 20 form the same surface, or the end face of the resin ring 20 is the end of the hollow fiber membrane bundle 13. You may cut | disconnect so that the state withdrawn inside the end surface can be maintained. For example, when the difference between the end faces of the resin ring 20 and the end face of the hollow fiber membrane bundle 13 is 10 mm, the end face of the hollow fiber membrane bundle 13 may be cut to a length of 10 mm, or cut to a length of less than 10 mm. May be.

  In this manufacturing method, since no external force is applied to the resin ring 20 at the time of cutting, the fixing surface of the resin ring 20 and the hollow fiber membrane bundle 13 is not peeled off, and the resin ring 20 and the water collecting pipe 12 The sticking surface of is not peeled off.

Example 1
(First step)
A hollow fiber membrane (made by Daisen Membrane Systems) made of cellulose acetate resin and a water collecting tube made of polyvinyl chloride (thickness 1 mm, outer diameter 76 mm, length 1094 mm) in a cylindrical case (length 1100 mm) Housed in. At both ends, one resin ring was placed between the hollow fiber membrane and the water collecting pipe. Hollow fiber membrane bundle, resin ring made of urethane resin (ring 20B in FIG. 3B) (length 80mm, thickness 3mm, hole 21 diameter 4mm, total number of holes 21 64), end face of water collecting pipe is It was the same.

(Second step)
Both ends were adhered and fixed using a polyurene adhesive (mixture of trade name Colonnade 4428 and trade name NIPPOLAN 4221, manufactured by Nippon Polyurethane).

(Third process)
Using a slicer (automatic trimming device, manufactured by Combs), the ends of the sealed hollow fiber membrane bundle, the resin ring, and the water collecting pipe were cut, and the ends of the hollow fiber membrane were opened. When the cut portion was confirmed with the naked eye after the cutting operation, the water collecting tube was not peeled off from the resin sealing portion (resin ring).

Example 2
(First step)
A bundle of hollow fiber membranes (manufactured by Daisen Membrane Systems) made of cellulose acetate resin and a water collecting tube (thickness 1 mm, length 1094 mm) made of polyvinyl chloride were accommodated in a cylindrical case (length 1100 mm). At both ends, one resin ring was placed between the hollow fiber membrane and the water collecting pipe. Hollow fiber membrane bundle, resin ring made of urethane resin (ring 20D in Fig. 3 (D)) (length 80mm, thickness 2mm, slit length 20mm, convex height 2mm), end face of water collecting pipe is flush I made it.

(Second step)
Both ends were adhered and fixed using a polyurene adhesive (mixture of trade name Colonnade 4428 and trade name NIPPOLAN 4221, manufactured by Nippon Polyurethane).

(Third process)
Using a slicer (automatic trimming device, manufactured by Combs), the ends of the sealed hollow fiber membrane bundle, the resin ring, and the water collecting pipe were cut, and the ends of the hollow fiber membrane were opened. When the cut portion was confirmed with the naked eye after the cutting operation, the water collecting tube was not peeled off from the resin sealing portion (resin ring).

Comparative Example 1
(First step)
A hollow fiber membrane (made by Daisen Membrane Systems) made of cellulose acetate resin and a polyvinyl chloride water collecting tube (thickness 1 mm, length 1146 mm) were stored in a cylindrical case (length 1100 mm). A resin ring was not used.

(Second step)
Both ends were adhered and fixed using a polyurene adhesive (mixture of trade name Colonnade 4428 and trade name NIPPOLAN 4221, manufactured by Nippon Polyurethane).

(Third process)
The end of the hollow fiber membrane and the end of the polyvinyl chloride water collecting tube were opened at the end of the hollow fiber membrane using a slicer (automatic trimming device, manufactured by Combs). At this time, a part of the water collecting pipe was peeled off from the resin sealing portion.

The longitudinal direction sectional view of the hollow fiber type membrane module of the present invention. The elements on larger scale of FIG. The perspective view (the perspective view of four different forms) of the resin-made rings used by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hollow fiber type membrane module 11 Cylindrical case 12 Water collecting pipe 13 Hollow fiber membrane bundle 14 Water collecting port 15 Resin sealing part 20, 20A-20D Resin ring

Claims (4)

A water collecting pipe and a hollow fiber membrane bundle are accommodated in a cylindrical case, the hollow fiber membrane bundle is disposed around the water collecting pipe, and at least one end of the water collecting pipe and the hollow fiber membrane bundle are integrated with a sealing resin. Hollow fiber membrane module,
At the end integrated with the sealing resin, a resin ring is interposed between the water collection tube end and the hollow fiber membrane bundle end, and the water collection tube end and the hollow fiber membrane A hollow fiber membrane module in which a bundle end and the resin ring are integrated with the sealing resin.   The hollow fiber membrane module according to claim 1, wherein an end surface of the resin ring is fixed in a state of being retracted inward from an end surface of the hollow fiber membrane bundle. It is a manufacturing method of the hollow fiber type membrane module according to claim 1,
A step of sealing with a resin ring interposed between the water collection tube and the hollow fiber membrane bundle when at least one end side of the water collection tube and the hollow fiber membrane bundle disposed around the water collection tube is sealed with a sealing resin; ,
A step of cutting the water collecting pipe, the resin ring and the hollow fiber membrane bundle together when cutting the end sealed with the sealing resin;
A method for producing a hollow fiber membrane module. It is a manufacturing method of the hollow fiber type membrane module according to claim 2,
When sealing at least one end side of the water collection pipe and the hollow fiber membrane bundle disposed around it with a sealing resin, a resin ring is interposed between the water collection pipe and the hollow fiber membrane bundle, and the resin ring Sealing the end face so as to retract inside the end face of the hollow fiber membrane bundle,
When cutting the end sealed with the sealing resin, cutting the end of the water collecting pipe and the hollow fiber membrane bundle, and not cutting the end of the resin ring;
A method for producing a hollow fiber membrane module.

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