JPH0316622A - Hollow fiber module - Google Patents

Abstract

PURPOSE:To prevent the reduction of filtering ability by fixing bundles of fibers in a cylindrical case and further enclosing the bundles with a cylindrical flow regulating tube in the case at one end or both ends. CONSTITUTION:Bundles 4 of fibers are fixed in a cylindrical case 3 and further enclosed with a cylindrical flow regulating tube 1 in the case 3 at one end or both ends to obtain a hollow fiber module. A liq. flowing into the case 3 from a nozzle 2 collides against the tube 1 present between the case 3 and the bundles 4, passes through the circular gap 6 between the tube 1 and the case 3 and is regularly sent into the module. At this time, a high speed flow is generated along the inner wall of the case 3, the diameter of the bundles 4 is increased and the fibers are hardly broken.

Description

Detailed Description of the Invention (Industrial field in Icheon) The present invention is a hollow fiber module, in particular, a hollow fiber bundle is inserted into a cylindrical case having a nozzle on the side, and the ends of the hollow fiber bundle and the case end are separated. The present invention relates to a hollow fiber module in which the ends of the hollow fibers are sealed with adhesive.

(Prior art) A conventional hollow fiber type module, in particular, a hollow fiber bundle is inserted into a cylindrical case having a nozzle on the side, and the hollow fiber bundle is inserted between the end of the hollow fiber bundle and the case end, and the hollow fiber ends are mutually connected. In hollow fiber modules that are sealed with adhesive, there is either nothing between the nozzle and the fiber bundle on the side of the case, or there is a cylindrical body with many holes on the side for water flow. Ta. For example, Japanese Patent Application Laid-Open No. 62-204804 discloses "a cylindrical body consisting of a large number of through holes for passage of water flow and a barrier wall for direct movement of water flow."

(Problems to be Solved by the Invention) However, in these known modules, during normal filtration or when back pressure washing is performed by changing the filtration direction, the raw solution or cleaning solution that enters from the nozzle on the side of the case is directly or through water flow. The flow passes perpendicularly to the hollow fiber bundle from the outside to the center of the fiber bundle.For this reason, especially in the high flow range, the fiber bundle is pushed by the liquid flow and becomes dense, and the center of the fiber bundle is It has drawbacks such as difficulty in applying liquid pressure to the hollow fibers in the section, resulting in insufficient filtration ability as a module, and insufficient cleaning recovery during back pressure washing.

Furthermore, if there is a wall that prevents the direct movement of water flow from the nozzle or the nozzle part, the flow enters the thread east C vertically from the hole on the opposite side of the nozzle, which may cause thread breakage at high flow rates. Ta.

The present invention improves the problems of the prior art described above, and
It is an object of the present invention to provide a module that can effectively utilize the central part of hollow fibers even in a high flow rate range when introducing a stock solution or a cleaning solution into a module from a nozzle, and that is less likely to break the fibers due to the liquid flow.

(Means for Solving the Problems) The hollow fiber type module of the present invention has a fiber bundle consisting of a large number of hollow fibers inserted into a cylindrical case having a nozzle on the side, and an end portion of the hollow fiber bundle and a case. In a hollow fiber module in which the ends and ends of the hollow fibers are sealed with adhesive, one end or both ends of the fiber bundle are inside a cylindrical case.
Furthermore, it is characterized by being surrounded by a cylindrical rectifying tube.

<<Sakukawa>> Hereinafter, the features of the present invention will be specifically explained along with its operation with reference to the drawings. Although the rationale behind the effects achieved by the hollow fiber module of the present invention is not clear, it is thought to be as follows.

The module of the present invention is a fiber bundle (4
) was inserted into a cylindrical case (3) having a nozzle (2) on the side, and the spaces between the end of the hollow fiber bundle and the case end and between the ends of the hollow fibers were sealed with adhesive (5). In this type of module, one or both ends of the yarn bundle (4) are inside a cylindrical case (3), and a cylindrical case (1) is located inside the cylindrical case (3).
It is characterized by being wrapped in Cylindrical case (
3), by further wrapping one or both ends of the string east (4) with a cylindrical straightening tube (1), the liquid flowing into the case (3) from the nozzle (2>) flows between the case (3) and the string. After colliding with the rectifying cylinder (1) interposed between the bundle (4), the annular gap (6) between the rectifying cylinder and the case shown in Fig.
) and then rectified and sent into the module. At that time, it is thought that since a high-velocity flow is generated along the inner wall of the case, the yarn east diameter increases, and the gaps between the yarns widen, effectively transmitting the liquid pressure to the center of the yarn bundle. Furthermore, it is believed that the uniform flow of the yarn bundle in the longitudinal direction along the inner wall of the case reduces the force applied to the hollow fibers, thereby eliminating the occurrence of yarn breakage. Conventionally, wrapping the yarn bundle in a cylindrical object without holes was thought to reduce the effective space of the yarn bundle or increase the resistance to penetration, and was not considered at all. .

As the cylindrical straightening tube used in the present invention, any material having strength and elution resistance can be used, but the same material as the case or a molded product of plastic such as polyethylene or polypropylene is preferably used. Further, these cylindrical rectifier tubes may be provided at both ends, but must be used at least at one end.

The outer diameter of this cylindrical rectifier tube is preferably about 98 to 50% of the inner diameter of the case existing outside the tube.

If it exceeds 98%, the pressure loss will be large, and if it is less than 50%, the number of hollow fibers that can be filled will decrease, resulting in a decrease in the processing time per module.

The length of the cylindrical straightening tube is preferably about 3 to 20% of the thread length, excluding the end part buried in the adhesive.

If it is less than 3%, the rectifying effect will be reduced, the water permeability will be reduced, and there will be a possibility of thread breakage, which is not preferable. Moreover, if it exceeds 20%, the amount of water permeation tends to decrease, which is not preferable.

The cylindrical body may have a hole in the part where the adhesive will fit in order to increase the adhesive strength, and a protrusion (7) may be provided to secure it to the case (3). Figure 1, Figure 2)
. The nozzle (2) forms a smooth flow of liquid to the case (
3) is preferably arranged adjacent to the adhesive layer (5) at the eastern end of the yarn so as to flow into the adhesive layer (5) (FIG. 3).

<Example 1> Borisulfone hollow fiber ultrafiltration I1!2 (inner diameter 0.65
mm, outer diameter 1.10 mm. Pure water permeability 1.35j! /H
3,000 hollow fibers of r・kg/am2-m-25℃) are attached to one end with an outer diameter of 75 mm and an effective length of 80 mm (length not including the part buried in the adhesive) as shown in Figures 1 and 2. A cylindrical straightening cylinder made of polypropylene is fixed with an inner diameter of 83 m.
A hollow fiber type module with an effective hollow fiber bundle length of 1 m was made by storing it in a polysulfone case of 1 m and sealing both ends with an epoxy adhesive. 25 from the nozzle on the side with the rectifier tube
When pure water at ℃ was put into the module and filtered, the result was 4.0
lkg/cm” to obtain a filtration rate of m’/Hr.
of water pressure was required. In addition, although the filtration rate was increased to 10 m'/hr and the machine was operated for 24 hours, no thread breakage occurred.

(Comparative Example 1) A module was made in the same manner as in Example 1, except that a solid cylindrical rectifying cylinder was not attached. When pure water at 25° C. was poured into the module from one nozzle and MA was performed, 3. 5m'/H
A water pressure of 1 kg/cm' was required to obtain a filtration amount of r. Further, when an inspection was conducted after 30 minutes of filtration at a filtration rate of 4.0 m'/Hr, thread breakage had occurred.

(Effects of the Invention) As described above, it is possible to easily provide a hollow fiber module with less occurrence of fiber breakage and excellent filtration ability than conventional products, and its effects are remarkable.

[Brief explanation of drawings]

The figures show a one-cusp h'ti aspect of the present invention, in which Fig. 1 is a front view of a cylindrical straightening tube, Fig. 2 is a side view, and Fig. 3 is a schematic diagram showing a cross section of a hollow fiber type module. be. 1. Cylindrical rectifier tube 2. Nozzle 3. Circumferential case 4. Thread bundle 5. Adhesive 6. Gap 7. protrusion

Claims (1)

[Claims] A fiber bundle consisting of a large number of hollow fibers is inserted into a cylindrical case having a nozzle on the side, and the spaces between the ends of the hollow fiber bundle and the case end and between the ends of the hollow fibers are sealed with adhesive. A hollow fiber module characterized in that one end or both ends of a fiber bundle are further wrapped in a cylindrical rectifying tube within a cylindrical case.