JPH043623Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a liquid separation device, and particularly to a liquid separation device suitable for producing ultrapure water or sterile water.

<Prior art> A liquid separation device is, for example, a membrane formed by combining two porous membranes and forming a permeate flow path inside a membrane envelope and a stock solution spacer, which are overlapped and wound around a permeate collection tube. It is configured to use a separation element to collect permeated liquid that has passed through the porous membrane from the stock solution flowing between the membrane envelopes and entered the permeated liquid flow path in the membrane envelopes into a liquid collection tube and taken out to the outside.

In conventional devices, as a collection pipe for the permeate,
Hard PVC, modified polyphenylene oxide, epoxy FRP, and stainless steel pipes have been used. However, in recent years, when used for producing ultrapure water or sterile water, it has become necessary for these devices to withstand heat sterilization using hot water, steam, or the like.

However, in a conventional liquid separation device using a liquid collection tube made of the material mentioned above, the adhesive portion between the liquid collection tube and the membrane envelope peels off due to repeated thermal expansion and contraction of the liquid collection tube due to repeated heating, etc. This caused problems in practical use due to contamination of the stock solution with the permeate. In addition, when epoxy FRP or stainless steel pipes are used as liquid collecting pipes, peeling of the adhesive part due to thermal expansion is prevented, but uncured substances and metal ions are more likely to be eluted into the permeated liquid, and the resulting permeated water is It had the disadvantage of poor purity. In addition, stainless steel pipes are expensive, heavy, and impractical.

<Purpose> The present invention solves the above-mentioned drawbacks of the conventional technology, and the liquid collecting pipe does not undergo thermal expansion even under repeated high temperature and cold heat such as during heat sterilization in the production of ultrapure water and sterile water.
The purpose of the present invention is to provide a liquid separation device that does not peel off at the adhesive portion with a membrane envelope.

<Structure> The present invention uses a membrane separation element consisting of a membrane envelope in which two porous membranes are combined to form a permeate flow path inside, and a stock solution spacer that is overlapped and wound around a permeate collection tube. In a liquid separation device, the permeated liquid that has passed through the porous membrane from the stock liquid flowing between the membrane envelopes and entered the permeated liquid channel in the membrane envelope is collected in a liquid collecting pipe and taken out to the outside. The liquid collecting pipe is made of a composite material of hard vinyl chloride, polypropylene, polycarbonate, polysulfone, or polytetrafluoroethylene plastic and fibers with low heat shrinkage. Characterized by enhanced strength.

<Example> Fig. 1 is a perspective view of a membrane separation element used in the implementation device of the present invention, Fig. 2 is a partially sectional perspective view showing the structure of the membrane separation element, and Fig. 3 is a partially cutaway view of a liquid collecting pipe. A perspective view, FIG. 4 is a partially cutaway perspective view showing another example of a liquid collecting pipe.

The membrane separation element 1, which is the main component of the liquid separation device, consists of a permeated liquid collecting pipe 10 in the center, a membrane envelope 20 wound around the liquid collecting pipe 10, and a raw liquid spacer 30. The membrane envelope 20 has two porous membranes 21, 21 bonded together at their peripheral edges to form a permeate flow path 22 inside. Note that the adhesive of the membrane envelope 20 is not applied to the end 20a into which the stock solution flows. In addition, the liquid collection tube 10 is attached to the membrane envelope 20.
The membranes 21 and 21 are not bonded to each other, and the permeate flows into the pipe 10 from the permeate inflow hole 11 of the liquid collecting pipe 10.

On the other hand, a stock solution spacer 30 is provided overlapping the membrane envelope 20, and the membrane separation element 1 is constructed by winding the stock solution spacer 30 and the membrane envelope 20 together around the liquid collection tube 10. The space between the membrane envelopes 20 with the stock solution spacer 30 interposed therebetween becomes a stock solution path 31. Note that a permeate spacer 23 may be inserted into the permeate flow path 22.

As mentioned above, the liquid collection tube 10 is connected to the membrane envelope 2.
0 and has a permeate inflow hole 11 on its surface that communicates with the permeate flow path 22.
The permeate flowing in from the inflow hole 1 passes through. In the present invention, this liquid collecting pipe 10 is made of fibers 4 with little heat expansion and contraction.
0, fiber reinforced in the axial direction to prevent thermal expansion and contraction due to heating and cooling. As the reinforcing fibers 40, long fibers (continuous from one end to the other end) or short fibers of glass fibers or carbon fibers can be used as materials with little heat expansion and contraction, and these can be used within the wall thickness of the liquid collecting pipe 10. Alternatively, it is applied to the surface layer in the axial direction to form a composite material. The fibers 40 may be applied parallel to the axis, as shown in FIG. 3, or in a mesh pattern, as shown in FIG. 4, at a suitable angle to the axis, such as from 5 to 30 degrees. As the material of the liquid collecting pipe 10 itself, a low elution plastic such as hard vinyl chloride, polypropylene, polycarbonate, polysulfone, or polytetrafluoroethylene is used.

The stock solution introduced like the G arrow is membrane envelope 20,
The liquid passes through the membrane 21 from between 20 and enters the permeate passage 22 as a permeate, is collected in the liquid collection tube 10 in the center, and is discharged to the outside as shown by arrow T. membrane 2
The liquid that did not pass through 1 is passed through the concentrate flow path 3 as a concentrated liquid.
1 to the outside as shown by the arrow N.

<Effects> As explained above, according to the present invention, the liquid collection pipe is made of a composite of hard vinyl chloride, polypropylene, polycarbonate, polysulfone, or polytetrafluoroethylene plastic and fibers with low heat shrinkage. It is made of a material with reinforced axial strength due to its fibers, so even when high temperature and cold heat are repeatedly applied during heat sterilization in the production of ultrapure water and sterile water, etc. There is no thermal expansion or contraction of the liquid collecting pipe, which prevents leakage of raw water to the permeate side. Furthermore, since plastics such as polytetrafluoroethylene have a low elution rate of uncured substances and metal ions, it is possible to obtain permeated water with high purity.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a membrane separation element used in the apparatus for implementing the present invention, Fig. 2 is a partially cutaway perspective view showing the structure of the membrane separation element, Fig. 3 is a partially cutaway perspective view of a liquid collecting pipe, FIG. 4 is a partially cutaway perspective view showing another example of the liquid collecting pipe. 1... Membrane separation element, 10... Liquid collection pipe, 1
1... Permeate inflow hole, 20... Membrane envelope, 21...
Porous membrane, 22... Permeated liquid channel, 30... Stock solution spacer, 31... Stock solution channel, 40... Fiber.

Claims (1)

[Scope of utility model registration request] It has a membrane separation element formed by stacking two porous membranes to form a permeate flow path inside and a stock solution spacer and winding it around a permeate collection tube, and between the membrane envelopes. In the liquid separation device, the permeated liquid that has passed through the porous membrane and entered the permeated liquid flow path in the membrane envelope from the stock liquid flowing through the membrane envelope is collected in the liquid collecting pipe and taken out to the outside. Manufactured from a composite material of vinyl chloride, polypropylene, polycarbonate, polysulfone, or polytetrafluoroethylene plastic and fibers with low heat shrinkage, and the fibers strengthen the axial strength. A liquid separation device characterized by: