JPH04197425A - Hollow fiber membrane filter module - Google Patents

Abstract

PURPOSE:To accelerate the permeation of a solvent and to achieve uniform adhesion by providing a gap between a cylindrical case and the leading end part of a cap for forming a liquid collecting chamber over the entire periphery of the case and providing an opening part allowing the gap to communicate with the outside. CONSTITUTION:Hollow fiber membranes 2 bundled in a U-shape are received in a cylindrical case 1 and the U-shape end parts of the hollow fiber membranes and the cylindrical case 1 are integrally fixed by a resin fixing layer 3. A larger number of flow path holes 6 are provided to the side surface of the cylindrical case 1 and a fluid flows in the cylindrical case from these flow path holes to be filtered from the outsides of the hollow fiber membranes 2 to the insides thereof and moves to a liquid collecting chamber 5 to flow to a liquid passing port 7. A solvent injection port 9 and a solvent permeation part 10 are provided to the connection part of the cap 4 for forming the liquid collecting chamber and the cylindrical case 1. A solvent is injected from the solvent injection port 9 using a syringe having an injection needle to be allowed to flow in the solvent permeation part 10. The solvent flowing in the solvent permeation part 10 further permeates in a fitting part 11 to bond the cap and the case.

Description

[Detailed description of the invention] [Industrial application fields] The present invention relates to a hollow fiber model filtration module.

[Prior Art] In recent years, membrane modules with fluid filtration capabilities have been used in the medical field.
It has come to be widely used in the fields of liquid and gas processing.

One type of module is a module that has a liquid collection chamber that collects the filtered water from the outside of the hollow fiber to the inside and guides it to a water port (connected to other equipment or piping).

[Problems to be Solved by the Invention] In the case of such a hollow fiber membrane type filtration module, the resin fixing layer is cut in order to open holes in the hollow fiber membrane fixed with resin in the cylindrical case, and then the liquid collecting layer is cut. A chamber-forming cap must be connected. As a method for adhering the cap to the cylindrical case, known adhesion methods such as adhesive adhesion, thermal fusion, and solvent adhesion can be used. Although thermal bonding methods such as welding, ultrasonic welting, and friction welding can achieve uniform bonding, it is difficult to control the occurrence of thermal distortion, and bonding with adhesives does not adhere to the joint. Generally, it is difficult to obtain a strong □ bonding force because a different layer called a bonding agent is formed. Among these bonding methods, solvent bonding is easy to work with, provides high strength, and has low residual stress.
It has the advantage of being able to adhere neatly. However, when bonding the liquid collection chamber forming cap and the cylindrical case of a hollow fiber membrane type filtration module with a solvent, the solvent usually evaporates easily.
In large-diameter modules, the degree of swelling and dissolution differs between the area where the solvent is applied first and the area where it is applied last, resulting in a viscosity difference and uneven adhesion. Furthermore, if the bonding area is large, even if bonding is performed immediately after applying the solvent, there will be areas where the solvent has not penetrated, causing leakage from the bonded area. A further disadvantage is that it is impossible to repair a module in which an unpenetrated portion has occurred because the cap cannot be removed.

[Means for Solving the Problems] The present invention includes a cylindrical case with at least one end open, and a cylindrical case that is housed in a U-shape or substantially linear shape, and that has at least one end opened. an open hollow fiber membrane; a resin fixing layer that liquid-tightly fixes the end of the hollow fiber membrane and the inner surface of the open end of the cylindrical case; In a hollow fiber membrane filtration module consisting of a cap for forming a liquid collection chamber having a communication port communicating with the hollow part of the membrane, the case and the cap at the fitting part of the cylindrical case and the cap for forming the liquid collection chamber are A gap is provided around the entire circumference between the tip of the cap and the tip of the cap. This hollow fiber membrane filtration module is characterized by being provided with an opening that communicates the gap with the outside.

The opening is a solvent injection port for injecting a solvent into the gap, and the gap is a solvent penetration part for allowing the solvent injected from the injection port to penetrate all around the fitting part.

The gap (solvent permeation part) provided at the tip of the cap is preferably in the form of a band with a constant width, and can be obtained, for example, by providing a notch or a groove in either or both of the case and the cap.

The solvent injection port need only have a structure that allows the solvent to be injected from the outside into this solvent penetration part, and is usually provided around the entire circumference of the cap, but it may also have a structure in which a plurality of holes are arranged evenly around the entire circumference. .

As the material for the porous hollow fiber membrane used in the present invention, known materials including polyolefin, cellulose, polysulfone, polyvinyl alcohol, and polyacrylonitrile can be used without particular limitation. These hollow fiber membranes are bundled into a U-shape or a substantially straight line and housed in a cylindrical case. Hollow fiber membranes bundled in a U-shape have their U-shaped ends fixed with a resin, and hollow fiber membranes bundled in a straight line have one or both ends fixed with a resin.

The hollow fiber membrane at the resin-fixed end is left open, but the end of the linear focused hollow fiber membrane that is not fixed with the resin is closed.

Furthermore, known shapes, sizes, materials, etc. of other elements of the module of the present invention can be used without particular limitation.

The present invention will be described below with reference to the drawings.

FIG. 1 is a schematic vertical sectional view showing an example of the hollow fiber membrane filtration module of the present invention, and FIG. 2 is an enlarged view showing a solvent inlet and a solvent permeation part. Hollow fiber membranes 2 bundled in a U-shape are housed in a cylindrical case 1, and the U-shaped ends of the hollow fiber membranes and the cylindrical case are integrally fixed with a resin fixing layer 3. Note that most of the hollow fiber membrane 2 is omitted in the figure.

In this membrane module, a large number of flow passage holes 6 are provided on the side surface of the cylindrical case 1, and fluid flows into the flow passage holes and is filtered from the outside to the inside of the hollow fiber membrane 2.
and flows to the liquid passage lower. Here 0-ring 8
serves as a sealing member when installing the membrane module into the main body of the filtration device.

A solvent inlet 9 and a solvent permeation part 10 are provided at the joint between the cap 4 for forming a liquid collection chamber and the cylindrical case 1. The solvent is injected from the solvent injection port 9 using a syringe with a needle, etc., and is caused to flow into the solvent penetration part 10. Solvent penetration part 1
The solvent that has flowed into the fitting portion 11 further penetrates into the fitting portion 11 and is bonded thereto. The solvent injection ports may be arranged in a groove shape all over the circumference, or several injection ports may be arranged evenly on the circumference. The injection port should be large enough to accommodate at least a syringe needle.

Further, the solvent permeation portion only needs to have a space on the periphery that is large enough to hold a small amount of the solvent. Furthermore, it is preferable that the fitting degree of the fitting part 11 is such that the fitting part 11 is in close contact and at the same time allows the solvent to easily permeate from the solvent permeation part 10. If the fit is too close, it will not penetrate into the fitting portion, resulting in poor adhesion, and if the degree of fit is too loose, there is a risk of poor adhesion.

The solvent to be used is preferably selected in consideration of the material of the cylindrical case and the cap for forming the liquid collection chamber, and the boiling point, solubility, and dissolution rate of the solvent. For example, when the material is polycarbonate, ethylene chloride (ethane dichloride) and the like are preferred, and when the material is polysulfone, methylene chloride and the like are preferred.

As for the drying method, if an adhesion level of about 200 kg/am" is sufficient, it is sufficient to leave it at room temperature for 24 hours. However, if higher strength is required or if it is used in a high temperature atmosphere, drying at 60°C for 24 hours is sufficient. It is preferable to dry it for a long time.

Furthermore, in the past, once adhesive was bonded and a defective solvent penetration area occurred, fluid would leak from there and the module could not be used. However, in the present invention, even if a solvent penetration failure occurs, a space is provided in advance as the solvent injection port 9, so the solvent can be injected again from the solvent injection port 9 using a syringe with a needle, etc. It is possible to repair defective parts.

[Example code] The present invention will be explained below with reference to Examples.

Example 1 A cap for forming a liquid collection chamber (made of polycarbonate, inner diameter φ64 mm, wall thickness 3 mm) with a closed liquid passage lower as shown in Fig. Circumferential case with closed passage hole 6 (made of polycarbonate, inner diameter φ64 mm, wall thickness 3 mm, length 215 mm)
mm) was produced. At this time, the degree of fitting between the case and the cap was set to such a degree that the contact length of the fitting part was 6 mm, and that when they were fitted and the cap side was facing down, it would fall off when shaken slightly.

Next, in the fitted state, ethylene chloride was injected from the solvent injection port using a syringe with a needle, and the solvent penetrated into the solvent permeation area and the fitting area.

After that, it was dried at 60°C for 24 hours.

Regarding the modules (2 pieces) obtained in this way,
At room temperature, 3.0 kg/c from the closed end side of the cylindrical case
A repeated water pressure test was conducted in which one cycle consisted of applying a water pressure of m2 for 10 seconds and releasing the pressure for 10 seconds to check for leakage from the bonded portion, and the results shown in Table 1 were obtained.

The target number of cycles under this condition typically required for a module is 25,000 or more.

Table 1 Table Example 2 A module was produced in exactly the same manner as in Example 1, and the water pressure was set to 5.
A water pressure test was repeated with one cycle of 0 Kg/cm'' for 10 seconds and 10 seconds of pressure release, and leakage from the bonded portion was examined, and the results shown in Table 2 were obtained.

The target number of cycles under this condition that is normally required for the module is 18,000 or more.

Table 2 Table Example 3 and Comparative Example 1 A module completely similar to Example 1 was prepared using polysulfone as the material for the cap for forming the liquid collection chamber and the cylindrical case, and the module was bonded using methylene chloride as a solvent. 60
It was dried at ℃ for 24 hours.

The module obtained in this way was placed in hot water at the temperature shown in Table 3 in the third section from the closed end side of the cylindrical case.
A repeated water pressure test was conducted in which the water pressure shown in the table was applied for 10 seconds and the pressure was released for 10 seconds as one cycle, and leakage from the bonded portion was examined, and the results shown in Table 3 were obtained.

Further, Table 3 shows a test as Comparative Example 1 in which adhesion using epoxy resin was performed instead of the solvent adhesion in Example 3.

Table 3 Table Example 4 Regarding the module manufactured in exactly the same way as Example 3,
A heat cycle test of 5 minutes in 90℃ hot water and 5 minutes in 0℃ cold water was conducted for 100 cycles, and then 5.0Kg/cm was applied from the closed end side of the cylindrical case at room temperature.
A repeated water pressure test was conducted in which one cycle was a water pressure of 10 seconds and a pressure release for 10 seconds to check for leakage from the bonded portion, and the results shown in Table 4 were obtained.

Table 4 [Effects of the Invention] The membrane module of the present invention exhibits the following excellent effects.

(1) By providing a solvent inlet and a solvent penetration part,
The solvent penetrates quickly and it is possible to bond evenly.

(2) By providing a solvent inlet and a solvent penetration part,
Even if a solvent-unpenetrated area occurs, it can be corrected.

(3) Even modules with large diameters or modules requiring a large bonding area can be bonded easily and neatly.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical cross-sectional view of the hollow fiber membrane filtration module of the present invention, and FIG. 2 is an enlarged view of a part of the fitting portion thereof. 1: Cylindrical case 2: Hollow fiber membrane 3: Resin fixed layer 4: Cap for forming liquid collection chamber 5: Liquid collection chamber 6: Channel hole 7: Liquid passage port 8: 0-Ring 9: Solvent injection port (opening Part) 1o: Solvent penetration part (gap) 11: Fitting part Patent applicant Mitsubishi Rayon Co., Ltd.

Claims (1)

[Scope of Claims] A cylindrical case with at least one end opened, and a hollow fiber membrane stored in the cylindrical case in a U-shape or substantially straight line and with at least one end opened. , a resin fixing layer that liquid-tightly fixes the end of the hollow fiber membrane and the inner surface of the opening end of the cylindrical case; In a hollow fiber membrane filtration module that includes a cap for forming a liquid collection chamber and a cap for forming a liquid collection chamber, there is a gap between the case and the tip of the cap at the fitting part between the cylindrical case and the cap for forming the liquid collection chamber. A hollow fiber membrane filtration module characterized in that a gap is provided along the circumference, and an opening is provided to communicate the gap with the outside.