JP2867040B2 - Hollow fiber membrane filtration module - Google Patents

Description

The present invention relates to a hollow fiber membrane type filtration module.

[Conventional technology]

In recent years, membrane modules having a fluid filtration capability have been widely used in the medical field, liquid and gas processing fields, and the like.

In these membrane modules, the potting resin fixing portion has a role of separating the hollow portion and the outer surface of the hollow fiber membrane from each other in a confidential manner and fixing the hollow fiber membrane to the cylindrical case body.

[Problems to be solved by the invention]

However, it is necessary to increase the thickness of the resin fixing portion layer in order to impart strength to the resin fixing portion layer, but in this case, a large amount of fixing resin is required and a hollow fiber membrane bundle of a fixed length is required. There is a problem that the filtration effective membrane area is reduced.

On the other hand, if the thickness of the resin fixing portion layer is reduced, the strength decreases and the resin fixing portion layer is easily deformed due to pressure during use. A problem arises in that the adhesive interface with the metal is peeled off. In particular, this phenomenon appears remarkably when a urethane resin or the like having flexibility even after curing is used at room temperature. Furthermore, even if an epoxy resin or the like having high heat resistance is used, deformation occurs in hot water at 50 ° C. or higher, and these problems become more serious as the module size increases.

[Means for solving the problem]

The gist of the present invention is to provide a cylindrical case 1 having at least one open end, a hollow fiber membrane 2 having a U-shaped or substantially straight bundle bundled and housed in the cylindrical case, and having both ends opened. A resin fixing layer 3 for liquid-tightly fixing the end of the hollow fiber membrane and the inner surface of the open end of the cylindrical case; and a resin fixing layer 3 provided outside the open end of the cylindrical case and communicating with the hollow part of the hollow fiber membrane. In the hollow fiber membrane filtration module including the liquid collecting chamber forming cap 4 having the formed liquid passing ports, the liquid collecting chamber forming cap is provided with the projections 5, and the projections are in close contact with the resin fixing layer 3. And a hollow fiber membrane filtration module characterized in that they are arranged in close proximity to each other.

Examples of the material of the porous hollow fiber membrane used in the present invention include known materials such as polyolefin, cellulose, polysulfone, polyvinyl alcohol, and polyacrylonitrile. These hollow fiber membranes are bundled in a U-shape or almost straight shape and stored in a cylindrical case. The U-shaped hollow fiber membrane is fixed with resin at its U-shaped end, and the hollow fiber membrane linearly bundled is fixed with resin at one or both ends. The hollow fiber membrane at the resin-fixed end is in an open state, but the end of the linear bundled hollow fiber membrane not fixed with the resin is closed.

 Hereinafter, the present invention will be described with reference to the drawings.

FIG. 1 is a schematic longitudinal sectional view showing an example of the hollow fiber membrane filtration module of the present invention. Hollow fiber membrane 2 bundled in U-shape
Is housed in a cylindrical case 1, and the U-shaped end of the hollow fiber membrane and the cylindrical case are integrally fixed by a resin fixing layer 3.
In the figure, most of the hollow fiber membrane 2 is omitted.

In this membrane module, a large number of flow passage holes 6 are provided on the side surface of the cylindrical case 1, and a fluid flows in from the flow passage holes and is filtered from the outside to the inside of the hollow fiber membrane 2, and the liquid collection chamber is formed. 7 and flows to the liquid passage 8. Here, the o-ring 9 serves as a seal member when the membrane module is installed on the main body of the filtration device.

A projection 5 is provided on the liquid collecting chamber forming cap 4, and the projection is arranged in close proximity to the resin fixing layer 3 without being in close contact with the resin fixing layer 3. At this time, the distance between the tip of the protrusion and the resin fixing layer is 0.03 when the inner diameter of the cylindrical case is D.
Particularly preferably, it is D or less.

The protrusions can take various shapes including a rod shape and a cylindrical shape, and the size and number thereof are not particularly limited. In the case of a cylindrical shape, a hole may be provided in the side surface to allow a liquid to pass therethrough.

The area occupied by the projections with respect to the entire area of the resin fixing layer is not particularly limited, but is preferably about 1 to 10% in consideration of the utilization efficiency and the reinforcing effect of the hollow fiber membrane. or,
As the material of the protrusion, metal, glass, porcelain, resin, or the like can be used, but the same material as that of the cylindrical case is preferable.

The membrane module of the present invention may be one in which both ends of a cylindrical case are fixed with resin as shown in FIG. Further, a membrane module in which an inner cylinder is arranged in a cylindrical case, and hollow fiber membranes are linearly arranged between the cylindrical case and the inner cylinder, and both ends of which are fixed with resin may be used.

Further, in these membrane modules, a porous sheet may be interposed between the hollow fiber membrane and the cylindrical case as necessary.

〔Example〕

 Hereinafter, the present invention will be described with reference to examples.

Example 1 9312 porous polyethylene hollow fiber membranes having an outer diameter of 370 μm and a thickness of 55 μm were bundled in a U-shape, housed in a polycarbonate cylindrical case having an inner diameter of 81 mmφ and a length of 60 mm, and one side made of urethane resin. Was fixed with a resin to produce a film module having a resin fixing layer having a thickness of 5 mm as shown in FIG.
At that time, four rod-shaped projections were provided concentrically inside the cap for forming a liquid collection chamber, and the distance from the resin fixing layer was 1 mm.

Since the protrusions are provided in proximity to the resin fixing layer, the protrusions did not damage the resin of the resin fixing layer or the opening of the hollow fiber membrane during the assembly of the membrane module.

The two membrane modules obtained in this manner are sealed with the channel hole of the cylindrical case, the other end 10 of the cylindrical case is opened, and a water pressure of 3.0 kg / cm ² is applied from this portion for 10 seconds. Repeated water pressure test with 1 cycle of 10 seconds of pressure release, peeling after 30,000 cycles,
It never happened.

Comparative Example 1 5680 porous polyethylene hollow fiber membranes having an outer diameter of 370 μm and a film thickness of 55 μm were bundled in a U-shape to form an inner diameter of 64 mmφ and a length of 215 mm.
And a film module having the same structure as that of Example 1 except that the resin fixing layer had a thickness of 5 mm using a urethane resin and no protrusions were provided.

Seal the channel hole of the cylindrical case of this membrane module,
Over pressure of 2.0 kg / cm ² or 3.0 kg / cm ² from an end portion of the cylindrical casing of the resin fixing layer Mori raised deformed state, where the examination of the state of peeling between the case and the resin having conducted, the results of Table 1 was gotten.

Example 2 4000 porous polyethylene hollow fiber membranes having an outer diameter of 410 μm and a film thickness of 70 μm were bundled in a U-shape and housed in a polypropylene cylindrical case having an inner diameter of 64 mmφ and a length of 45 mm. Fixing, resin fixing layer thickness 10mm, Example 1
A film module provided with the same protrusions as in the above was manufactured.

Since the projection is provided in the vicinity of the resin fixing layer, the projection did not damage the resin of the resin fixing layer or the opening of the hollow fiber membrane during the assembly of the membrane module.

The membrane module obtained in this manner was sealed with a flow passage hole, and the end of the cylindrical case was heated at 70 ° C. in warm water.
A water pressure test of 2.0 kg / cm ² for 10 seconds and a pressure release of 10 seconds as one cycle were repeated and the water pressure resistance test was performed. The results in Table 2 were obtained.

Example 3 The results of Table 2 were obtained in the same manner as in Example 2 except that the conditions of the water pressure resistance test were 80 ° C. and 2.5 kg / cm ² .

Comparative Examples 2 and 3 A membrane module was manufactured in the same manner as in Example 2 except that no protrusion was provided, and a water pressure resistance test was performed in the same manner as in Example 2 or 3. The results in Table 2 were obtained. Obtained.

[Effects of the Invention] The membrane module of the present invention has the following excellent effects.

(1) Deformation of the resin fixing layer is suppressed by providing the projections, and it is possible to prevent cracking of the resin and separation of the bonding interface.

(2) Since the resin fixing layer is reinforced by providing the projections, the resin fixing layer can be made thinner.

(3) As the resin fixing layer becomes thinner, the effective area of the hollow fiber membrane filtration per unit volume is increased, and the resin used can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are schematic longitudinal sectional views of a hollow fiber membrane filtration module of the present invention, in which most of the hollow fiber membranes are omitted. 1; cylindrical case; 2; hollow fiber membrane 3; resin fixing layer 4; liquid collecting chamber forming cap 5; projection 6; flow path hole 7; liquid collecting chamber 8; liquid inlet 9; o-ring

Claims (2)

(57) [Claims] 1. A tubular case 1 having at least one open end, a hollow fiber membrane 2 which is bundled and stored in a U-shape or substantially linear shape in the tubular case, and has both ends opened. ,
A resin fixing layer 3 for fixing the end of the hollow fiber membrane and the inner surface of the open end of the cylindrical case in a liquid-tight manner, and is provided outside the open end of the cylindrical case and communicates with the hollow part of the hollow fiber membrane. In the hollow fiber membrane filtration module including the liquid collecting chamber forming cap 4 having a liquid passage port, the liquid collecting chamber forming cap is provided with the protrusion 5, and the protrusion comes close to the resin fixing layer 3 without being in close contact with the resin fixing layer 3. A hollow fiber membrane filtration module which is arranged in a state. 2. The hollow fiber according to claim 1, wherein the distance between the tip of the protrusion and the resin fixing layer is 0.03D or less, where D is the inner diameter of the cylindrical case. Membrane filtration module.