JPS60232208A - Treatment of filter module using hollow fiber - Google Patents

Abstract

PURPOSE:To surely and simply make a hollow fiber hydrophilic or hydrophobic in a desired ratio at a desired place, by pressing a nozzle to the partial region of the opening end of a module and introducing a hydrophilicity or hydrophobicity imparting medium into said module under pressure. CONSTITUTION:In a filter module wherein the bundle of hydrophobic hollow fibers comprising polyethylene is received in a cylinder 3 and fixed to the inner wall of the cylinder 3 by a potting material 2, a hydrophilicity imparting medium such as an ethyl alcohol solution is introduced into a module under pressure prior to use and, subsequently, water is introduced thereinto under pressure to make the fibers hydrophilic. Next, a nozzle 7 is pressed to the partial region of the outlet end of the cylinder 3 to supply pressurized air through the hollow parts of the fibers. Pressurized air is substituted with water in the walls of fibers when transmitted to the outside from said walls to make said substituted parts hydrophobic. After this treatment, air in water is made easy to be able to permeate through the hollow parts of the fibers through the hydrophobicity imparted part and water filtering efficiency is prevented from receiving obstruction by the stay of air bubbles.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method for treating filtration monomers using porous hollow fibers.

More specifically, the present invention relates to a method using hydrophobic porous hollow fibers to hydrophilize only the hollow fibers in an arbitrary portion of a monol.

PRIOR ART Conventionally, a p-permonol in which a bundle of porous hollow fibers having fine pores is enclosed in a cylinder is used to filter aqueous liquid (hereinafter referred to as water), and water passes through the fine pores. It is filtered and components in the water that cannot pass through the micropores are separated. In order for water to pass through the micropores, the hollow fibers must originally be hydrophilic, or if they are made of a hydrophobic material, the tube walls of the hollow fibers must be made hydrophilic. However, ordinary water to be treated often contains gases mainly composed of air (hereinafter referred to as air), and when this reaches the hydrophilic pipe wall, it is exposed to normal pressures such as 1 yu/tori. It cannot pass through the pipe wall and remains as bubbles on the hollow fiber pipe wall, inhibiting the permeation of the water to be treated. Therefore, the filtration efficiency of heptanols decreases over time, and may eventually become completely unfilterable.

In order to improve this situation, it is considered that a part of the hollow fibers constituting Mosol is made hydrophobic so that the entrained air bubbles can penetrate into the hollow interior through the hydrophobic part and escape from the system through the open end. It is being In this way, to make only some fibers hydrophobic and other fibers hydrophilic, mix hydrophilic hollow fibers and hydrophobic hollow fibers in the desired ratio in advance, and then mix the mixture into fibers. A method of making monols in bundles is being considered. This method requires the preparation of both hollow fibers made of a hydrophilic material and hollow fibers made of a hydrophobic material, and has the disadvantage that the manufacturing cost is relatively high. Another drawback is that materials that are naturally hydrophilic are easily degraded by microorganisms.

Of course, it is also possible to make the hydrophobic fibers hydrophilic through a hydrophilic treatment and mix this with the original hydrophobic fibers in a desired ratio to form a fiber bundle, but it is also possible to make a fiber bundle by enclosing the fiber bundle (3) in the module. When fixing the ends of the fiber bundles to the housing with the tatting material, it is necessary to keep it dry, so the hydrophilic treatment in this case must be a permanent hydrophilic treatment that maintains its hydrophilicity even in dry conditions. is necessary. Hydrophilic monomer grafting, plasma treatment under special conditions, and the like are known as methods for this, but these methods are troublesome and result in a considerable increase in cost.

OBJECTS OF THE INVENTION The present invention has been made to overcome the drawbacks of the prior art, and it is an object of the present invention to provide a method for easily partially hydrophilizing a p-permeable module made of hydrophobic hollow fibers.

Structure of the Invention The gist of the present invention is that a fiber bundle formed by bundling a large number of hydrophobic porous hollow fibers is housed in a cylinder, and at least one end of the fiber bundle has a hollow interior at one end of the lens barrel. An open end is formed that communicates with the outside of the cylinder, but is filled and fixed with a potting material so as to maintain watertightness between the fibers and between the fibers and the inner wall of the cylinder. (4) When the fluid to be treated permeates into the hollow interior of the fiber through only the porous pipe wall of the fiber, it is filtered, and the filtered water is discharged from the open end through the hollow interior. In the p-permozole produced, prior to use, an appropriate hydrophilic medium is press-fitted into the hollow interior of some of the hollow fibers constituting the fiber bundle through a partial region of the open end surface, or a hydrophilic medium is is press-fitted into the hollow interior of the hollow fiber to make the fiber bundle hydrophilic, and then an appropriate hydrophobizing medium is press-fitted into the hollow interior of some of the hollow fibers through a partial area of the open end surface, thereby converting the hydrophilic portion and the hydrophobic portion. The present invention provides a method for processing filtered heptanols using hollow fibers, which is characterized by obtaining a filtration module having a filtration portion.

In the present invention, any hydrophobic hollow fiber can be used as long as it is made of a hydrophobic material. For example, polyolefins such as

The p-filtered monols to which the present invention is applied include both fully filtered monoyls and partially filtered monols.

The hydrophilic medium of the present invention is methyl alcohol.

Lower alcohols such as ethyl alcohol and propyl alcohol, surfactant aqueous solutions, etc. can be used, but
When the monol is used for treating liquids for medical use or food and drink, it is preferable to use ethyl alcohol from the viewpoints of toxicity, ease of removal of the hydrophilic medium after water replacement, and the like.

Fluorocar as a hydrophobic medium? It is also possible to use chemical substances such as air, but it is easiest to use air.

Example The present invention will be explained in more detail below with reference to the drawings.

An example of the structure of a Mosol for filtration, which is the object of the present invention, is shown in FIGS. 1 and 2.

FIG. 1 shows a state in which a nozzle is pressed against a part of the open end face of a full p-type module in order to inject a hydrophilic medium or a hydrophobic medium. This Seven Zeal is a tube 3 in which multiple fibers 1 having a hollow structure are bundled in parallel to form a fiber bundle.
The fiber bundle is accommodated in the tube in the axial direction, and one end of the fiber bundle is fixed to the inner wall of the tube by a potting material 2 at one end of the tube. At this time, each fiber 1 is held so that its hollow interior is not blocked, that is, its hollow interior can communicate with the outside at the outlet 5, and the spaces between each fiber and between the fibers and the inner wall of the cylinder are completely watertightly filled. It needs to be fixed.

The other end of the fiber bundle is hermetically fixed to the tube 3 at the other end of the tube 3. Also, a water supply port 4 is provided in a part of the outer wall of the portion 3.

FIG. 2 is a plan view of the seven wheels as seen from the exit side.

゛The pipe wall of the hollow fiber 1 has a large number of micropores, and the water to be treated injected into the cylinder 3 from the water supply port 4 permeates into the hollow part of the hollow fiber 1 through these micropores. Impurities are filtered by the wall, and the purified water is discharged out of the system from the outlet 5 through the hollow section.

The one shown in Fig. 3 is another example of p-permonol (7), in which the hollow fiber bundle is housed in the tube 3 in a U-shape rather than a straight line, and both ends are curved in a U-shape. The hollow interior is fixed at one end of the tube 3 so that it can communicate with the outside at the outlet 5. Also in this case, the spaces between the fibers and between the fibers and the inner wall of the cylinder are filled with the potting material 2 in a watertight manner. In this example, the water supply port 4 is provided at the lower end of the tube 3, and as in the previous example, the water supplied into the tube is filtered when it passes through the porous tube wall of the fibers 1, and then exits from the outlet 5. Exhausted from the system.

In either case, as mentioned above, the hollow fibers in the module must be hydrophobic in a portion of the tube wall, specifically, approximately the total area of the tube wall, and the remaining portion must be hydrophilic. This is necessary to discharge the air mixed in the water to be treated to the outside of the system.

In order to impart such a hydrophobicity ratio to the hollow fibers, in one embodiment of the present invention, monoale is prepared using hydrophobic hollow fibers, and then hydrophilization treatment is performed by a known method.

When filtration is carried out in the usual manner using this, as mentioned above, mixed air accumulates on the tube wall (8), the p-filtration capacity gradually decreases, and air bubbles grow one after another, resulting in air pockets 6 (6) inside the cylinder. (Fig. 3), and the filtration efficiency decreases. To avoid this drawback, a nozzle 7 with a constant outlet cross-section is connected to a pressurized air supply source (not shown) by filling the monomer with water in advance or at the point when the air bubbles accumulate during overspeeding. Pressurized air is forced into a region of the outlet end 5 of the cylinder 3 and fed into the cylinder through the hollow part of the fiber.

The pressurized air passes through the tube wall of the hollow fiber in the area pressed by the nozzle 7 from inside to outside and is discharged into the cylinder, at which time water in the tube wall of the hollow fiber is removed and replaced with water. Ru. As a characteristic of porous hollow fibers made of a hydrophobic material, once the air is encapsulated, it adheres to the walls of the micropores and is captured, making that part hydrophobic. Therefore, after this treatment, the air in the water can easily permeate into the hollow part of the fiber through the hydrophobized part, and the water filtration efficiency of other parts is prevented from being inhibited due to the accumulation of air bubbles. .

According to the method of the present invention, by changing the outlet area of the nozzle 7 for supplying pressurized air, it is possible to reliably control the hydrophobization rate, and by changing the area to which the nozzle 7 is pressed, it is possible to control the hydrophobicity at a desired location. The hollow fibers of can be made hydrophobic.

The above aspects will be further elucidated in the following examples.

Example 1 Hollow fibers made of polyethylene with an outer diameter of 0.38 mm and a hole diameter of 0.27 mm were used. A bundle of 960 fibers was bent into a U-shape with a length of 120 mm, and an inner diameter of 25 + m.
The filter was housed in a polycarbonate tube with a thickness of 3 mm and a length of 150 mm, and both were fixed with a polyurethane resin potting material to produce a filtration tube shown in FIG. 3. Prior to use, an alcohol solution of 70% alcohol and 30% water was injected into the monole, and then water was injected to replace this to make the fibers hydrophilic, and then two nozzles with a diameter of 2.0 m were installed. It was pressed against the open end of the #fine bundle at outlet 5 of the monoyl, and pressurized air at a pressure of 4 kg 7 cm" and a temperature of about 23°C was supplied for 3 minutes. As a result, the fibers with the open end were placed in the area where the nozzle was pressed. Hydrophobized.

Another embodiment of the present invention is to leave the originally hydrophobic fibers constituting the heptadole as they are, and only the remaining fibers are made hydrophilic to provide a predetermined affinity/homophobicity ratio. That is, prior to use, a nozzle 7 having a constant outlet cross-sectional area is pressed against a part of the outlet end 5 of the cylinder 3, and alcohol is supplied from the nozzle 7. Alcohol is supplied into the cylinder through the hollow part of the fibers having openings in this region, passes through the pipe wall of the fibers, is discharged outside the upper hollow part filled with the fine pores, and is discharged to the outside of the system from the water supply port 4. Ru. Next, when water is injected from the nozzle 7, the alcohol remaining in the fiber tube wall is mixed with water and discharged, and the inside of the tube wall is replaced with water, thereby imparting hydrophilicity. This hydrophilic treatment is performed only on the fibers that have openings in the area where the nozzle 7 is applied, and the other fibers are left hydrophobic, so the exit area of the nozzle 7 is reduced as in the first embodiment. By changing the ratio, the affinity ratio can be reliably controlled, and by selectively making only the hollow fibers at desired locations hydrophilic, Cl2) can be obtained.

This second aspect will be further elucidated in the following examples.

Example 2 Hollow fibers made of polyethylene with an outer diameter of 038 fins and a hole diameter of 0.27 m+ were used, and 1,920 of them were bundled in a straight line with an inner diameter of 25 cm, a thickness of 3 m, and a length of 250 cm. The first tube is housed in a polycarmenate tube, and both are fixed with polyurethane resin potting material.
The filtration monol shown in the figure was prepared. Prior to use, press four nozzles with an inner diameter of 8 mm onto the open end of the fiber bundle at the outlet 5 of the module, and add 200 d of alcohol 70% and water 30 d.
After injecting the alcohol solution (1), 500 ml of water was injected to replace the alcohol solution to make it hydrophilic.

The ratio was almost the same as that of [Effects of the Invention] As detailed above, according to the present invention, by simply pressing the nozzle against a partial area of the open end of the module and pressurizing the hydrophilic medium or the hydrophobic medium, the hydrophilic medium or the hydrophobic medium can be reliably produced in the desired ratio. In addition, it is possible to make the hollow fibers at desired locations hydrophilic or hydrophobic, and this method is significantly superior to conventional methods in terms of both quality and cost.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a module showing a first embodiment of the present invention. FIG. 2 is a plan sectional view taken along line A--A in FIG. 1. FIG. 3 is a side sectional view of a module showing a second embodiment of the invention. 1...Hollow fiber, 2...Potting material, 3...
Cylinder λ4... Water supply port, 5... Outlet, 6... Air pool, 7... Nozzle (14) 3rd item [0

Claims (1)

[Claims] 1. A fiber bundle formed by bundling a large number of hydrophobic porous hollow MR fibers is housed in a cylinder, and at least one end of the fiber bundle is connected to the hollow interior of the iron cylinder at one end. The entire open end is filled and fixed with a potting material so that the fibers communicate with the outside of the cylinder, but the spaces between the fibers and between the fibers and the inner wall of the cylinder are maintained watertight. The fluid to be treated is filtered when it permeates into the hollow interior through only the porous pipe wall of the fibers, and the filtrated water is discharged from the open end through the hollow interior. In the case of filtered monoyl, prior to use, an appropriate hydrophilic medium is press-fitted into the hollow interior of some of the hollow fibers forming the fiber bundle through a partial region of the open end surface, or a hydrophilic medium is inserted into the hollow fibers to form a fiber bundle. After making the fiber bundle hydrophilic by press-fitting it into the hollow interior, an appropriate hydrophobizing medium is press-fitted into the hollow interior of some of the hollow fibers through a partial region of the open end surface, thereby forming a hydrophilic portion and a hydrophobic portion. A method for processing a filtration module using hollow fibers, the method comprising obtaining a filtration module. 2. The processing method according to claim 1, wherein the ends of the fiber bundle other than the open end are watertightly sealed. 3. The processing method according to claim 1, wherein the fiber bundle is housed in a cylinder in a U-shape, and both ends of the fiber bundle form the open end. 4. The fibers are first treated with alcohol or a surfactant as a treatment medium, and then the water is replaced with a part of the hydrophobic heptadyl. Claims 1 to 3 The treatment method described in any one of claims 6 to 3, characterized in that a part of Mosol is made hydrophilic using air as a treatment medium. Processing method described.