JPS61222510A - Hollow yarn membrane module and its preparation - Google Patents

Abstract

PURPOSE:To prevent the release of a resin layer from an outer cylinder by strongly adhering the resin layer to an outer cylinder, by integrating the resin layer fixing a hollow yarn membrane bundle to the outer cylinder through piercing holes provided in the vicinity of both ends of the outer cylinder with the resin layer provided to the outside of the outer cylinder. CONSTITUTION:A hollow yarn membrane bundle 4 closed at both ends by heat sealing is inserted in an outer cylinder 1 having a large number of piercing holes 2 provided to both ends thereof so as to protrude the both ends of the yarn membrane bundle 4 from both ends of the outer cylinder 1 and the lower end part of the outer cylinder 1 is covered with a cap 5 having a step part 6 provided to the inner periphery thereof and a liquid injection molding grade resin 8 is injected in the cap 5 from a container 7 through a tube 9. The resin is flowed in the outer cylinder 1 from the piercing holes 2 to fill the space between the outer cylinder 1 and the hollow yarn membrane bundle 4, between yarn membranes and between the outside of the outer cylinder 1 and the inner surface of the cap 5. After the resin 8 was cured, the cap 5 is detached and the end part of the hollow yarn membrane bundle 4 is cut along with the resin 8 to open the membrane end parts of said membrane bundle 4. Next, the upper side of the bundle 4 is directed downwardly to receive the same operation. By this method, the release of the resin is not generated even in a cooling process after high temp. sterilization.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a hollow fiber membrane module and a manufacturing method thereof.

<Conventional technology> Conventional hollow fiber membrane modules are manufactured by inserting a hollow fiber membrane bundle outward and fixing the hollow fiber membrane bundle at both ends of the outer cylinder using synthetic resin for casting. are doing.

Epoxy resins or urethane resins are used as the above synthetic resins for casting, and adhesive bonding between the resin and the outer cylinder can be achieved by providing grooves or unevenness on the inner surface of the outer cylinder to increase the bonding area with the resin. Common.

<Problems to be Solved by the Invention> In the conventional method as described above, if the shrinkage rate of the resin during curing is large, the resin may peel off from the outer cylinder, and even if the shrinkage rate is small, the temperature may exceed 90°C. When hollow fiber membrane modules are sterilized by boiling at higher temperatures or steam sterilized at temperatures higher than 120°C, the problem is that the outer cylinder and resin often separate from each other during the cooling process due to the difference in shrinkage rate between the outer cylinder and the resin. was there.

<Means for solving the problems> This invention was made to solve the problems of the conventional hollow fiber membrane module as described above.
A plurality of through holes are provided near both ends of the outer cylinder provided with a permeate outlet, and the hollow fiber membrane bundle inserted into the outer cylinder is injected into the outer cylinder through the through holes and hardened resin is applied to the outer cylinder. The present invention provides a hollow fiber membrane module in which both ends of the outer cylinder are fixed and the outside of both ends of the outer cylinder are also covered with the resin, and a method for manufacturing the same.

<Embodiment> Reference numeral 1 in FIG. 2 is a cylindrical outer tube, both ends of which are open, and both ends are provided with a plurality of through holes 2 and a permeated liquid outlet 3.

Reference numeral 4 denotes a hollow fiber membrane bundle, which is a bundle of a plurality of known hollow fiber membranes, both ends of which are closed by heat sealing or the like to prevent the casting resin from entering.

This thread membrane bundle 4 is inserted into the outer tube 1, with an appropriate gap provided between the thread membrane bundle 4 and the outer tube 1, so that both ends of the yarn membrane bundle 4 protrude from both ends of the outer tube 1.

Next, as shown in FIG. 3, the outer cylinder 1 is made vertical, and the cap 5 facing upward is placed on the lower end thereof.

Since a step 6 is provided on the inner periphery of the cap 5, the end of the outer tube 1 rests on the step 6, and the end of the hollow fiber membrane bundle 4 protruding from the outer tube 1 is placed on the bottom surface of the cap 5. reach. Further, the peripheral wall of the cap 5 is made to completely cover the portion of the outer cylinder 1 in which the through hole 2 is formed.

After the cap 5 is placed on the lower end of the outer cylinder 1 as described above, the liquid synthetic resin for casting 8 is placed in the polyethylene container 7.
When the resin 8 is injected into the cap 5 through the polyethylene tube 9, the resin 8 flows into the outer cylinder 1 from each through hole 2 of the outer cylinder 1 in the cap 5 and flows between the outer cylinder 1 and the hollow fiber membrane bundle 4. It is filled in the gaps between the hollow fiber membrane bundles 4 and between the fiber membranes constituting the hollow fiber membrane bundle 4.
The space between the outside of the barrel 1 and the inside of the cap 5 is also filled.

After that, the resin 8 is left to stand for a certain period of time to completely harden, and then the cap 5 is removed and the end of the hollow fiber membrane bundle 4 protruding from the outer cylinder 1 is inserted along the chain line-A line in FIG. When the resin 8 is cut together, the closed ends of each fiber membrane constituting each hollow fiber membrane 4 are also opened.

After the above steps, the same process is performed this time with the side facing up in Figure 3 facing down.

Note that the operation of cutting along the line A-A after the casting mold is cured may be performed after the casting resin has finished curing at both ends.

The hollow fiber membrane module obtained by the above manufacturing method is shown in FIG. 1, and as is clear from this figure,
The cast resin 8 is firmly connected to the inside and outside of the outer cylinder 1 through the through hole 2, and the outer cylinder 1 and the thread membrane bundle 4 are also firmly connected.

The outer cylinder 1 used in the above example has an outer diameter of 114 m and a wall thickness of 4.0 m.
5rII! The through holes 2 have a diameter of 4711111, and the number of through holes 2 is such that the total area of the through holes 2 is about 40% of the adhesive area of the cast synthetic resin 8.

The cap 5 had an inner diameter of 125 am above the stepped portion 6 and an inner diameter of 105 alt below the stepped portion 6, and an epoxy resin was used as the synthetic resin 8 for casting. Also, after cutting and removing both ends from the A-A line, the completed hollow fiber membrane module was
After-cure was performed at ℃ for 4 hours.

In the above example, water vapor at about 120°C was passed through the hollow fiber membrane module for 1 hour, and then immediately switched to water at 25°C.
The water ran for an hour. Thereafter, one of the permeated water outlets was blinded, and the other permeated water outlet 3 was immersed in water with an air pressure of 2 Kfl/CIi applied to observe air leakage from between the outer cylinder 1 and the casting resin 8. However, no air leakage was observed.

Therefore, it can be confirmed that no peeling occurs between the outer cylinder 1 and the casting resin 8.

In addition, as a comparative example, an outer cylinder made of the same material with the same dimensions as the above example,
Using a hollow fiber membrane bundle with no through holes at both ends, insert the same hollow fiber membrane bundle as in the example into the outer cylinder, cover the end of the outer cylinder with a cap, and then pour the casting resin around the outer periphery of the outer cylinder. After inserting a polyethylene tube from the permeated liquid outlet and injecting epoxy resin casting resin and hardening it, the other side was cast in the same way, and after hardening, the same process as in the previous example was carried out. A hollow tea membrane module was obtained.

When this hollow fiber membrane module as a comparative example was subjected to the same test as in the example, air leakage was observed from the adhesive interface between the outer cylinder and the casting resin, and it was confirmed that peeling had occurred.

Note that the shape and size of the through-hole of the outer cylinder used in the invention are not particularly limited, and various shapes and sizes may be selected, and the number thereof is also not limited.

However, the ratio of the total area of the through holes to the adhesive portion of the casting resin is determined by the strength of the outer cylinder itself, the shrinkage rate, and the adhesive force between the resin and the outer cylinder, and is usually 10 to 90%.

Further, the thickness of the resin layer on the outer circumference of the outer cylinder is not particularly limited.

<Effects> In the hollow fiber membrane module of the present invention, inside the outer cylinder, the resin layer that connects the hollow fiber membrane bundle to the outer cylinder and the resin layer on the outside of the outer cylinder have a plurality of through holes provided near the end of the outer cylinder. Since the resin layer and the outer cylinder are integrated through the resin layer, the resin layer and the outer cylinder are bonded extremely firmly.

Therefore, there is no fear that the resin layer will peel off from the outer cylinder even during the rapid cooling process after high temperature sterilization or steam sterilization.

In addition, the method for manufacturing a hollow module of the present invention involves inserting a hollow fiber membrane bundle consisting of a large number of hollow fiber membranes with both ends closed into an outer cylinder having a plurality of through holes at both ends, and inserting the hollow fiber membrane bundle into a cap that covers the outer cylinder. By injecting the resin for casting from the outside of the outer cylinder, the resin is also injected into the outer cylinder through the through hole of the outer cylinder, so it is extremely easy to inject the resin. Since the injection amount can also be checked from the outside, the resin injection amount can be adjusted accurately.

Furthermore, since the ends of each hollow fiber membrane are closed during casting, there is an advantage that there is no possibility that the casting resin will flow into the fiber membrane and cause clogging.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view showing an example of the hollow fiber membrane module of the present invention, FIG. 2 is a side view of an outer cylinder used in the same, and FIG. 3 is a partially cutaway longitudinal sectional side view of a manufactured state.

Claims (2)

[Claims] (1) Both ends are open and through holes are provided near both ends of the outer cylinder provided with a permeate outlet, and the hollow fiber membrane bundle inserted into the outer cylinder is
A hollow fiber membrane module characterized in that it is fixed to the outer cylinder with a resin injected into the outer cylinder through the through hole and hardened, and the outer sides of both ends of the outer cylinder are also covered. (2) Stand vertically an outer cylinder with both ends open, a permeate outlet provided, and a through hole provided near both ends, and cover the downward facing end of the outer cylinder with an upward facing cap. A hollow fiber membrane bundle consisting of a large number of closed hollow fiber membranes is inserted into an outer cylinder, and a liquid resin is injected into the cap with its end protruding from the end of the outer cylinder to the bottom of the cap. ,
A hollow fiber characterized in that the resin is allowed to flow into the outer cylinder through the through hole of the outer cylinder, and after the resin is cured, the cap is removed and the end of the hollow fiber membrane bundle protruding from the outer cylinder is cut off. A method for manufacturing a hollow fiber membrane module.