JPH05115759A - Membrane separator - Google Patents

Abstract

PURPOSE:To efficiently separate a solution to be treated by suppressing the circulating stream caused by centrifugal force in a membrane separator. CONSTITUTION:Fixed barrier plates 2 and the flat membranes 4 attached to a hollow rotary shaft 3 are alternately arranged in a pressure container 1 and supply passages 5 far supplying a solution to be treated to the center part of the barrier plates 2 are formed to the buffle plates 2. When the solution to be treated is sent to the supply passages 5 under pressure, the solution to be treated is supplied to the center part in the container 1 from supply ports 5a, 5b, 5c and the permeating solution through the flat membranes 4 is taken out to the outside from the discharge passage 3a provided in the hollow rotary shaft 3 and a concentrate is taken out to the outside from the outer peripheral part of the container 1 through valves 7.

Description

Detailed Description of the Invention

[0001]

The present invention relates to food manufacturing, drug development,
The present invention relates to a membrane separation device of so-called cross-flow membrane separation devices used in fields such as fermentation, wastewater treatment, and chemistry.

[0002]

2. Description of the Related Art A membrane separation device which can separate a treatment liquid having a viscosity higher than that of a conventional cross-flow type membrane treatment device using a tubular membrane or a hollow fiber membrane is drawing attention. As this membrane separation device, there are Japanese Patent Laid-Open Nos. 61-25607 and 61-
As described in JP-A-181503 and JP-A-61-138505, a disc-shaped flat membrane is rotated in the treatment liquid to generate a shearing force between the filter medium surface and the treatment liquid, and the membrane surface The one in which the gel layer (cake layer) that has adhered is removed while the separation is carried out, or Jitsuko Sho 60-31
As described in Japanese Patent Publication No. 761 Gazette, a baffle plate fixed to a rotating shaft by fixing a disk-shaped flat film is rotated to generate a shearing force between the turbulent flow of the processing liquid and the disk-shaped flat film. There are things I tried to do.

In the former membrane separation apparatus, as shown in FIG. 5, a plurality of baffle plates 102 are fixed in a container 101 at a predetermined interval, and a hollow rotary shaft 103 is fixed between the baffle plates 102. The plate-shaped flat membrane 104 is arranged, the treatment liquid is discharged from the outer peripheral side of the container 101 through the valve 105 to the baffle plate 102, and the permeated liquid filtered by the disc-shaped flat membrane 104 is passed through the hollow rotary shaft 1
03, and the concentrated liquid is taken out from the outer peripheral side of the container 101 via the valve 106.

Further, as shown in FIG. 6, the processing liquid is supplied into the container 101 from one end portion of the container 101, and the disk-shaped flat film 10 is formed.
In some cases, the permeated liquid filtered in 4 is passed through the hollow rotary shaft 103 to take out the concentrated liquid from the other end of the container 101.

[0005]

However, in the above-described membrane separation device, the centrifugal force due to the rotation acts on the treating liquid on the rotating disk-shaped flat membrane surface, so that the outward flow in the radial direction is caused. Is induced, a flow outward in the radial direction is formed on the side of the flat disc, and a flow inward is formed on the side of the baffle plate, and a circulating flow 110 as shown in FIG. 5 is generated inside. Also, in Japanese Utility Model Publication No. 60-31761, the relationship between the baffle plate and the disk-shaped flat membrane is reversed, but a circulating flow is similarly generated. Further, when the fluid is rotating, a pressure difference due to centrifugal force is generated, so that the outer peripheral portion is in a pressurized state and the inner peripheral portion is in a depressurized state inside the container.

[0006] When such a circulating flow occurs, the residence time of the treatment liquid in the container becomes long and replacement of the concentrated liquid becomes poor, so that the concentration speed is lowered and damage due to shear stress on the film surface is caused. There is a possibility that it will be received, and a large cooling capacity is required because the temperature of the processing liquid rises due to the circulating flow.
Further, when the treatment liquid flows in a zigzag flow path as disclosed in JP-A-60-31761, the internal pressure loss increases, and as a result, pressure distribution occurs in the container, and the treatment liquid is stably filtered. In addition, it becomes difficult to supply the processing liquid.

[0007]

In order to solve the above-mentioned problems, the present invention fixes a baffle plate facing a membrane separation to a container of a membrane separation device, and treats the baffle plate or a rotary shaft having a flat membrane attached thereto. A liquid supply passage was provided, and the supply passage was opened at the center of the container or at a position close to the center. Further, the gap between the flat film and the baffle plate was made smaller than the boundary layer formed on the surface of the flat film.

[0008]

By supplying the processing liquid from the center of the container through the supply passage formed in the baffle plate, centrifugal force can be used in reverse to generate only a radially outward flow in the container. Prevents the generation of circulating flow.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a cross-sectional view of the membrane separation device according to the present invention, FIG. 2 is a plan view of a baffle plate of the device, and FIG. 3 is a plan view showing another example of the baffle plate.

In the membrane separation device, a plurality of baffle plates 2 having a through hole 2a formed in the center thereof are fixed to the inner wall of the container 1, while a hollow rotary shaft 3 rotatably supported on one end surface of the container 1 is provided. A plurality of disc-shaped flat membranes 4 ... And a plurality of baffle plates 2 ... which are inserted into the through holes 2a and attached to the hollow rotary shaft 3 are alternately arranged. In this case, the distance between the baffle plate 2 and the disk-shaped flat film 4 is made thinner than the boundary layer formed on the surface of the disk-shaped flat film 4.

A supply path 5 for supplying the processing liquid to the center of the container 1 is formed inside the baffle plate 2. The end of the supply path 5 near the center of the container 1 is supplied. The port 5a, the upper supply port 5b, and the lower supply port 5c are formed. The supply path 5 can be easily formed, for example, by bonding two ceramic plates having grooves to each other to form the baffle plate 2.

Further, the treatment liquid is supplied to the supply passage 5 from the outer peripheral portion of the container 1 through the valve 6, and the permeated liquid that has permeated the discoid flat membrane 4 is taken out from the hollow rotary shaft 3 and the container is also arranged. 1 The concentrated liquid is taken out from the outer peripheral portion via the valve 7. In addition, the discoid flat membrane has a pore size of 10 μm to 1
The porous layer 4a is coarse and has a small permeation resistance of 00 [mu] m, and the porous layer 4b provided on the surface thereof is fine and has a large permeation resistance of 0.01 [mu] m to 5 [mu] m.

In the membrane separation apparatus configured as described above, the treatment liquid is pressure-fed from the outer peripheral portion of the container 1 to the supply passage 5 of the baffle plate 2 via the valve 6, whereby the tip supply port 5a of the supply passage 5 is supplied. The treatment liquid is supplied to the center of the container 1 through the upper supply port 5b and the lower supply port 5c, and the permeated liquid that has permeated the discoid flat membrane 4 is discharged from the discharge passage 3a provided in the hollow rotary shaft 3 to the outside. The concentrated liquid is taken out from the outer peripheral portion of the container 1 through the valve 7 to the outside. In this case, when the disc-shaped flat membrane 4 rotates, centrifugal force due to the rotation acts on the treatment liquid on the surface of the disc-shaped flat membrane 4, so that a radial outward flow is induced, and the disc-shaped flat membrane 4 is induced. Since the distance between the membrane 4 and the baffle plate 2 is smaller than that of the boundary layer formed on the surface of the disk-shaped flat film 4, no radial inward flow is formed on the surface of the disk-shaped flat film 4, Therefore, no circulating flow is generated.

That is, when the treatment liquid is supplied from the outer peripheral portion or one end portion of the container 1, the treatment liquid in the central portion of the container 1 tends to move to the outer peripheral side, so that the central portion is decompressed and the pressure distribution becomes It occurs, but like this device, the supply path 5 in the baffle plate 2
It is possible to prevent the central portion from being decompressed and the pressure distribution from being generated by supplying the processing liquid to the central portion of the container 1 through.

In the baffle plate 2 shown in FIG. 3, the supply passage 5 is formed over about half the circumference of the central hole, and the tip end supply ports 5 are provided at three places.
By forming a, the treatment liquid is supplied from three locations toward the hollow rotary shaft 3.

Further, as shown in FIG. 4, a processing liquid discharge passage 3'is provided inside a hollow rotary shaft 3'provided at the center of the container 1.
Alternatively, the processing liquid may be supplied into the container 1 through the supply port 5′a formed in the supply path 5 ′.

[0017]

As described above, according to the present invention,
Since the processing liquid is supplied from the supply passage formed in the container to the center of the container or a position close to the center, only the outward flow in the radial direction can be generated between the baffle plate and the disk-shaped flat membrane. Therefore, the generation of the circulation flow due to the centrifugal force can be prevented, the heat generation and the pressure loss due to the circulation flow can be suppressed, and the processing capacity can be greatly improved.

[Brief description of drawings]

FIG. 1 is a schematic view of a membrane separation device according to the present invention.

FIG. 2 is a plan view of a baffle plate of the device.

FIG. 3 is a plan view showing another example of the baffle plate.

FIG. 4 is a sectional view of a hollow rotating shaft according to another embodiment.

FIG. 5 is a schematic view of a conventional membrane separation device.

FIG. 6 is a schematic view of a conventional membrane separation device.

[Explanation of symbols]

1 ... Container, 2 ... Baffle plate, 3, 3 '... Hollow rotating shaft, 4 ... Disc-shaped flat membrane, 5, 5' ... Supply path.

[Procedure amendment]

[Submission date] December 12, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Kenichi Shimodera Kenichi Shimodera 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu-shi, Fukuoka Totoki Kikai Co., Ltd. 2-1, 1-1 Totoki Equipment Co., Ltd.

Claims (3)

[Claims] 1. In a membrane separation device in which a flat membrane is rotated in a container and a baffle plate is fixed to the container, a supply passage for supplying a treatment liquid is formed in the container, and the supply passage is provided at the center of the container. A membrane separation device characterized by being opened at a close position. 2. In a membrane separation device in which a flat membrane is rotated in a container and a baffle plate is fixed to the container, a supply path for supplying a processing liquid into the container is formed in the baffle plate, and this supply path is used for the container. A membrane separation device characterized by being opened at a position close to the center. 3. The membrane separation device according to claim 1, wherein a gap between the flat membrane and the baffle plate is smaller than a boundary layer formed on the surface of the flat membrane.