JP2003103151A - Separation membrane unit with fluid mixing promotion means arranged on the membrane surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the concentration polarization on the supply side (primary side) of a separation membrane such as a pervaporation membrane or the like, and to improve the permeation performance of the membrane. A separation membrane unit and a membrane separation device in which are arranged are proposed. SOLUTION: Separation membrane 11a having molecular level pores
The first fluid L is supplied to the first fluid L and the secondary fluid of the separation membrane 11a is evacuated, or the second fluid G is supplied to the secondary fluid L to supply the first fluid L into the first fluid L. In the separation membrane unit 10 for selectively extracting the mixed substance to the secondary side, in the vicinity of or on the membrane surface of the primary side of the separation membrane 11a, the inside and outside of the boundary layer of the first fluid L A fluid mixing means for mixing the fluid L is arranged and configured.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention is used in a membrane separation method in which a fluid is brought into contact with the feed side of a mixture separation membrane having pores at the molecular level and components in the fluid are extracted from the permeate side of the membrane. The present invention relates to a separation membrane unit and a membrane separation device.

[0002]

2. Description of the Related Art Conventionally, in the case of a liquid mixture such as a liquid mixture or a near-boiling point mixture which is difficult to separate by distillation, a membrane separation method has been used to separate one composition from these liquid mixtures. Secondly, a specific component in the liquid mixture supplied to the primary side (supply side) is selectively dissolved and separated by a film having a pore having a molecular level of about 0.5 nmφ (5Åφ). The pervaporation method (pervaporation method: Pervaporation method: PV method) which is taken out as vapor to the secondary side (permeation side) of the membrane by diffusion is used.

According to this pervaporation method, an organic liquid containing water can be dehydrated or a specific liquid can be selectively separated from several kinds of organic liquids. For example, water in alcohol can be separated and removed. When concentrating alcohol, a liquid mixture is supplied to the primary side by using a separation membrane such as an aromatic polyimide membrane or a ceramic membrane disclosed in JP-A-8-318141, and the secondary side is made a negative pressure close to vacuum. By,
Since water in the liquid mixture permeates the separation membrane and is separated from the liquid mixture, the alcohol concentration of the liquid mixture supplied to the primary side can be increased.

As a pervaporation membrane (PV membrane) used for dehydrating the organic solvent, for example, Japanese Patent No. 25018 is used.
No. 25, a NaA type zeolite membrane obtained by hydrothermally synthesizing an aqueous mixture containing a silica source and an alkali metal source in the presence of an alumina porous carrier, and JP-A-8-31814.
No. 1 publication in which an A-type zeolite membrane is deposited on a support, JP-A No. 2000-42386, and JP-A No. 2000-2000.
There is a mixture separation membrane of JP-B-42387.

A ceramic film having excellent heat resistance, chemical resistance and durability has been developed, and can be applied to a solvent which is difficult to apply with a polymer film.

The pervaporation film of the ceramic film body has, for example, an outer diameter of 12 mmφ × a length of 800 mm and a plate thickness of 1.5 mm.
11 is formed by coating the outer diameter surface of the ceramic tube with a zeolite membrane, and has a double tube structure in which one membrane tube 11 is inserted into a cylindrical tube 14 as shown in FIG. Alternatively, as shown in FIG. 12, the number of the membrane tubes 11 is S
The membrane unit 20X is supported by a tube sheet 13 such as US304 and held in the container 15.

In the membrane unit 10X of FIG. 11, the gas G is circulated on the permeate side so that the vapor permeating the pervaporation membrane 11a is mixed with this gas G. However, the membrane unit 20X of FIG. Then, the permeation side is evacuated (low pressure) to suck the vapor that permeates the pervaporation film 11a.

[0008]

However, in the membrane unit of the pervaporation membrane, a boundary layer is formed in the vicinity of the liquid side surface of the pervaporation membrane, and the mass transfer due to the flow is reduced, so that the surface of the pervaporation membrane is reduced. In the vicinity, concentration polarization (Conce
ntration polarization) occurs and the concentration of the permeable substance is locally reduced, so that there is a problem that the transmission efficiency is reduced.

This concentration polarization is such that when a substance is separated by permeation through a membrane, the permeable substance in the treatment liquid permeates the membrane and moves to the permeation side, but is impermeable to a solvent or the like in the treatment liquid. Since the substance remains on the membrane surface, the concentration of solute becomes higher on the surface of the membrane compared to the concentration of the treatment liquid in a substantially completely mixed state separated from the membrane surface, and conversely, the concentration of the permeable substance. Is a phenomenon that becomes low.

A membrane unit 20 for holding a plurality of membrane tubes 11 therein as shown in FIG. 12 of the prior art.
In X, the flow of the liquid L is disturbed by the baffle plate 16 or the like which holds the intermediate portion of the membrane tube 11, but the boundary layer in the vicinity of the membrane surface is not sufficiently disturbed and concentration polarization occurs. Membrane unit 20X
There is a problem in that the membrane tube 11 incorporated in is not able to exhibit an insufficient separation performance.

In addition, at present, since the membrane unit of pervaporation membrane is expensive, increasing the permeation efficiency of this membrane unit leads to reduction of the membrane area and downsizing of the device. Since it also reduces the cost of the pervaporation method, it is an important point for expanding the applications of the pervaporation separation device.

The present invention has been made in order to solve the above problems, and an object thereof is to reduce concentration polarization on the supply side (primary side) of a separation membrane such as a pervaporation membrane to reduce the permeation of the membrane. It is an object of the present invention to propose a separation membrane unit and a membrane separation device, which are capable of improving the performance and in which a fluid mixing promoting means is arranged on the membrane surface.

[0013]

In order to achieve the above object, a separation membrane unit of the present invention, in which a fluid mixing promoting means is arranged on the membrane surface, is constructed as follows.

1) A first fluid is supplied to the primary side of a separation membrane having pores at the molecular level and the secondary side of the separation membrane is evacuated, or a second fluid is supplied to the secondary side. And then the first
In the separation membrane unit for selectively extracting the substance mixed in the fluid to the secondary side, in the vicinity of the membrane surface on the primary side of the separation membrane or on the membrane surface, inside and outside the boundary layer of the first fluid. And a fluid mixing promoting means for mixing the fluids.

According to this structure, the fluid mixing promoting means can be arranged in the vicinity of the membrane surface or on the membrane surface to mix the fluid near the membrane surface. It is possible to avoid concentration polarization.

Therefore, it is possible to prevent the concentration of the permeative substance on the surface of the membrane from decreasing and to maintain the permeation efficiency at a high level, thereby improving the separation efficiency by the membrane.

2) In the separation membrane unit in which the fluid mixing promoting means is arranged on the membrane surface, the liquid as the first fluid is provided on the primary side of the pervaporation membrane as the separation membrane having the pores at the molecular level. Is supplied and the secondary side of the pervaporation membrane is evacuated, or a gas as the second fluid is supplied to the secondary side to remove the substance mixed in the liquid from the secondary side. In the membrane unit for selectively extracting the fluid, a fluid mixing promoting means is arranged near or on the membrane surface on the primary side of the pervaporation membrane.

A liquid is supplied to the primary side of the pervaporation membrane used in the pervaporation method. However, since the liquid generally has little mass transfer between the inside and outside of the boundary layer formed on the membrane surface, the vicinity of this membrane surface or When a fluid mixing promoting means is arranged on the membrane surface,
Effectively, mass transfer can be promoted and concentration polarization can be avoided.

3) In the separation membrane unit in which the fluid mixing promoting means is arranged on the membrane surface, the fluid mixing promoting means vibrates or moves in the vicinity of at least a part of the membrane surface. Composed of.

According to this structure, the fluid mixing promoting means vibrates or moves in the vicinity of the surface of the membrane, so that the flow of the first fluid in the vicinity of the surface of the membrane, particularly the boundary layer, is disturbed more effectively and the mass transfer is performed. Further, since the mixing can be promoted, it is possible to prevent the concentration of the permeative substance on the membrane surface from lowering and to maintain the permeation efficiency of the membrane at a high level.

4) In the separation membrane unit in which the fluid mixing promoting means is arranged on the membrane surface, the separation membrane is formed on the outer peripheral surface of the support formed in a cylindrical shape, and the fluid mixing promotion is performed. The means is composed of a coil-shaped member that is arranged so as to surround the tubular support.

According to this structure, the coil-shaped member which can be manufactured relatively easily can effectively arrange the wire rod which serves as a fluid mixing promoting means in the vicinity of the cylindrical membrane surface.

5) In the separation membrane unit in which the fluid mixing promoting means is arranged on the membrane surface, the vibrating fluid mixing promoting member is configured to be a part of the vibration system.

A vibrating system is formed by using a coil spring formed of a spring member such as stainless steel or ceramics as the coil-shaped member or supporting a rigid coil-shaped member by a spring.

According to this structure, the vicinity of the film surface can be further disturbed by the vibration of the coil-shaped member, and further, the viscosity and flow velocity of the first fluid, the elasticity of the coil-shaped member, the cross-sectional shape and the size, etc. By making the relationship appropriate, it can be expected that the vibration due to the generation of the Karman vortex and the large vibration due to the resonance phenomenon with the vibration system of the coiled member will occur.

6) In the separation membrane unit in which the fluid mixing promoting means is arranged on the membrane surface, a vibrating portion is provided in a part of the vibrating fluid mixing promoting member.

The vibrating section can be formed of, for example, a member that generates a Karman vortex and vibrates by itself, or a magnetic material such as an iron piece that vibrates in response to an external magnetic force variation.

According to this structure, since the driving force of vibration can be dependent on the vibration generating portion, the vibration amplitude can be increased, and the stirring portion of the fluid mixing promoting means can be formed in a shape suitable for stirring to improve stirring efficiency. Can be improved.

7) In the separation membrane unit in which the fluid mixing promoting means is arranged on the membrane surface, the separation membrane is formed on the outer peripheral surface of the support formed in a tubular shape, and the fluid mixing promotion is performed. The means is arranged on the outer circumference of the cylindrical support, and is composed of a stirring member that rotates around the outer circumference.

The rotationally moving stirring member is constructed by partially or wholly having a portion that rotates or moves in the circumferential direction of the outer periphery by a flow, such as a screw portion or a blade.
The flow causes the outer circumference of the membrane to rotate,
Or, by the stirring part connected to these rotating parts,
The flow near the membrane surface is agitated to promote mixing of the first fluid.

According to this structure, the flow in the vicinity of the membrane surface can be more strongly agitated and the substance mixing can be promoted, so that the permeation efficiency of the membrane can be maintained high.

8) In the separation membrane unit in which the fluid mixing promoting means is arranged on the membrane surface, the fluid mixing promoting means is provided on the surface of the support member of the membrane on the first fluid supply side. A convex portion having a height of 0.5 mm to 5 mm, or
It is configured to be a recess having a depth of 0.5 mm to 5 mm.

This height of 0.5 mm to 5 mm and 0.5
The limitation of the depth of 5 mm to 5 mm indicates not the unevenness at the molecular level but the unevenness at the thickness level of the boundary layer of the fluid flow. Below 0.5 mm, the boundary layer is not sufficiently disturbed. Therefore, above 5 mm, the flow of the mainstream is obstructed. The shapes of the convex portions and the concave portions may be various shapes as long as they can promote the turbulence in the boundary layer of the flow to stir and mix the flow in the vicinity of the film surface, and various shapes are conceivable. You can determine the dimensions.

According to this structure, the unevenness of the membrane on the support side can promote the mixing of the fluid near the membrane surface with the main stream, so that the construction of the membrane unit is simplified.

9) In the separation membrane unit in which the fluid mixing promoting means is arranged on the membrane surface, the fluid mixing promoting means is provided on the outer member side surrounding the flow passage on the supply side of the first fluid. It is composed of a fluid mixing promoting member.

As the fluid mixing promoting means, there are a projection provided on the outer member and reaching the vicinity of the membrane surface, a fluid mixing promoting member supported by the outer member and arranged near the membrane surface, and the like.

According to this structure, the fluid mixing promoting means can be arranged relatively easily in the vicinity of the membrane surface.

10) In the separation membrane unit in which the fluid mixing promoting means is arranged on the membrane surface, the fluid mixing promoting means is composed of a filling member filled in the flow path on the supply side of the first fluid. It

As this filling member, for example, 1 mmφ
There are small spheres having a size of about 3 mmφ and irregular shaped objects, and this filling member may be either an elastic body or a rigid body, and the filling density may be sparse or dense.

According to this structure, the first fluid flows between the filling members, and the flow direction and flow velocity with respect to the vicinity of the membrane surface are changed, so that the stirring effect can be obtained. Therefore, the substances can be mixed by stirring the boundary layer by a relatively simple method of filling the flow path with the filling member.

11) In the separation membrane unit in which the fluid mixing promoting means is arranged on the membrane surface, the fluid mixing promoting means is mixed in the first fluid and agitated so as to move together with the first fluid. Configured to be a child.

As this stirrer, 1 mmφ to 3 mmφ
There are small spheres and irregular shaped objects of a certain size, and the boundary layer is agitated by moving together with the first fluid and passing near the membrane surface. This stirrer may be circulated together with the first fluid, or may be separated and recovered from the first fluid on the outlet side of the membrane unit and mixed with the first fluid on the inlet side of the membrane unit.

The stirrer that moves with this first fluid is
When flowing near the membrane surface while flowing, the flow can be disturbed and the mixing of substances can be promoted. Further, the effect of preventing fouling can be achieved.

12) In the separation membrane unit in which the fluid mixing promoting means is arranged on the surface of the membrane, the inflow amount of the first fluid into the separation membrane unit is changed with time to change the membrane on the primary side. It is configured to change the flow velocity and flow direction of the first fluid near the surface.

According to this structure, the flow velocity changes due to the change of the inflow amount of the first fluid, and the effect of the mixing promoting means for the first fluid can be further enhanced. Therefore, the mixing effect can be further enhanced. it can.

13) In the separation membrane unit in which fluid mixing promoting means is arranged on the membrane surface, in the separation membrane unit, by switching the inlet and the outlet of the first fluid, the membrane on the primary side It is configured to change the flow velocity and flow direction of the first fluid near the surface.

By switching between the inflow port and the outflow port, the effect of the fluid mixing promotion means can be promoted, and particularly in the case of the fluid mixing promotion means which moves in one direction from the inflow port toward the outflow port. In addition, the mixing promoting means for the moved fluid can be returned to the original position.

14) Then, a membrane separation device is constituted by using the separation membrane unit in which the fluid mixing promoting means is arranged on any one of the above-mentioned membrane surfaces.

According to this structure, the fluid mixing promoting means promotes the mixing of the fluid in the vicinity of the membrane surface with the fluid in the mainstream portion, reduces the influence of concentration polarization, and enhances the permeation efficiency. Therefore, it becomes a compact and inexpensive separation device with good separation efficiency.

[0050]

BEST MODE FOR CARRYING OUT THE INVENTION A separation membrane unit according to an embodiment of the present invention in which a fluid mixing promoting means is arranged on a membrane surface will be described below with reference to the drawings.

In the following description, the case where a pervaporation membrane is selected as the separation membrane having pores at the molecular level, a liquid is selected as the first fluid, and a gas is selected as the second liquid will be described. The present invention is not limited to these, and the present invention can be applied to other separation membranes and fluids.

Further, the pervaporation membrane units 10A to 10J corresponding to the pervaporation membrane unit (separation membrane unit) 10X having the double-tube structure shown in FIG. 11 will be described as an example.
It is also applicable to the pervaporation membrane unit having another structure such as the pervaporation membrane unit 20X.

The pervaporation membrane unit 10A shown in FIGS. 1 to 10 in which fluid mixing promoting means is arranged on the membrane surface.
10J is a conventional pervaporation membrane unit 1 shown in FIG.
Similarly to 0X or the like, the liquid (first fluid) L is supplied to the primary side of the pervaporation film 11a, and the gas (second fluid) G is supplied to the secondary side of the pervaporation film 11a to generate the liquid L. It is a pervaporation membrane unit that selectively extracts the substance mixed therein as vapor to the secondary side, and a fluid such as that described below is provided near or on the membrane surface on the primary side of the permeation vaporization membrane 11a. The mixing promoting means 31 to 38 are arranged.

The flow of the liquid L in the vicinity of the film surface, particularly the boundary layer, is disturbed by the fluid mixing promoting means 31 to 38 arranged in the vicinity of the film surface or on the surface of the film and the main flow with the liquid in the vicinity of the film surface. Mix with other liquids to enhance mass transfer and avoid concentration polarization. As a result, the concentration of the permeative substance on the membrane surface is prevented from decreasing and the permeation efficiency is kept high, so that the separation efficiency by the pervaporation membrane 11a can be improved.

The membrane unit 1 shown in FIGS.
In 0A to 10J, one membrane tube 11 is inserted into the cylindrical tube 14 and held by the support member 12 to have a double-tube structure. The membrane tube 11 has, for example, an outer diameter of 12 mmφ ×
It is formed by coating a zeolite tube 11a of NaA type, A type, T type or the like on the outer diameter surface of a ceramic tube made of alumina or the like having a length of 800 mm and a plate thickness of 1.5 mm.

The pervaporation membrane units (separation membrane units) 10A to 10J in which the fluid mixing promoting means are arranged on the membrane surface of each embodiment will be described below.

1 to 3 show a first embodiment.

Pervaporation membrane units 10A to 10A in which fluid mixing promoting means is arranged on the membrane surface of the first embodiment.
The fluid mixing promoting means in C is a coil spring (coil-shaped member) 30A formed of a spring member such as stainless steel or ceramics, and is arranged around the outer circumference of the membrane tube 11 having the pervaporation membrane 11a.

The coil spring 30A may be fixedly supported at one end or both ends, or may be held between the supporting members 12 of the membrane tube 11 by being stretched and supported by the elastic force in the longitudinal direction of the coil spring 30A. . Alternatively, both ends may be free-fitted between the support members 12, 12 of the membrane tube 11.

Due to the presence of the coil spring 30A, the flow of the liquid L near the film surface of the pervaporation film 11a is disturbed, vortices are generated, and the flow velocity changes, so that the liquid L inside the boundary layer and outside the boundary layer can be changed. The exchange is active and the mixing of substances is promoted. Thereby, the membrane-permeable substance can be made uniform, and the concentration polarization can be suppressed.

The effect of promoting the mixing of the liquid (fluid) in this flow is obtained when the coil spring 30A is fixed, when it is moving along the flow, or when it is moving in the direction that interrupts the flow. Even when vibrating, it occurs if there is a relative velocity between the coil spring 30A and the flow.

Further, when the fluid mixing promoting means is constituted by the coil spring 30A and the vibration system is constituted, the relationship between the viscosity and the flow velocity of the liquid L, the elasticity of the coil spring 30A and the cross-sectional shape and size etc. is appropriately related. By doing so, it is possible to cause a resonance phenomenon between the vibration due to the generation of the Karman vortex and the vibration system of the coil spring 30A, and the vibration of the coil spring 30A further disturbs the boundary layer to promote mass transfer. The vibration system can also be configured by spring-supporting a rigid coil-shaped member.

The fluid mixing promoting means shown in FIG. 1 is only the coil spring 30A, but the fluid mixing promoting means shown in FIG. 2 is a vibrating coil spring 30A provided with an oscillating portion. The vibrating portion is formed of a cylindrical member 31A that generates a Karman vortex and vibrates by itself. Also, FIG.
The vibrating part of the fluid mixing promoting means shown in (1) is formed of an iron piece 31B that vibrates in response to fluctuations in the external magnetic force, and the liquid (first
The fluid can also be vibrated by the electromagnet 32B or the like arranged inside or outside the cylindrical tube 14 or the container for storing the fluid).

According to the configurations of FIGS. 2 and 3, since the driving force of the vibration of the coil spring 30A can be dependent on the vibrating portions 31A and 31B, the vibrating force and the vibration can be increased, and the fluid mixing is promoted. It is possible to improve the mixing efficiency by forming the means 30A into a shape suitable for stirring.

The coil diameter of the coil spring 30A is
It is necessary to make the boundary layer large enough to disturb it. For example, when the average flow velocity of the liquid L is about 0.2 m / s,
When the outer diameter of the membrane tube 11 is about 12 mmφ,
The outer diameter of the membrane tube 11 is made larger by about 4 mm to 10 mm, and the wire diameter of the coil spring 30A is 3 mmφ to 10 mm.
It is formed with mmφ. If a spacer (not shown) is provided between the coil spring 30A and the membrane tube 11, it is possible to prevent the coil spring 30A from directly contacting the membrane surface and avoid damage to the pervaporation membrane 11a. Is preferred.

FIG. 4 and FIG. 5 show the second embodiment.

Permeation vaporization membrane units 10D, 10 in which fluid mixing promoting means is arranged on the membrane surface of the second embodiment.
The fluid mixing promoting means in E is arranged on the outer circumference of the membrane tube 11, and the stirring member 33 which rotates and moves on the outer circumference.
A and 33B.

The fluid mixing promoting means shown in FIG. 4 is a stirring member 33A which is formed in a screw shape along the longitudinal direction of the membrane tube 11 and rotates and moves.
By the flow that hits 3A, a force having a component in the peripheral direction of the membrane tube 11 acts, moves in the outer peripheral direction, and rotates around the membrane tube 11.

Further, the stirring member 3 which rotates and moves as shown in FIG.
3B includes a rotating portion 33Ba having rotating blades and a stirring portion 33.
This is a configuration in which Bb is connected.

The rotating stirring member 33A
Alternatively, the agitating portion 33Bb of the agitating member 33B more strongly agitates the flow in the vicinity of the membrane surface and promotes substance mixing, so that the permeation efficiency of the membrane 11a can be maintained high.

FIG. 6 shows a third embodiment.

A pervaporation membrane unit 1 having fluid mixing promoting means arranged on the membrane surface of the third embodiment shown in FIG.
The fluid mixing promoting means at 0F is 0.5 m provided on the surface of the support member of the membrane on the liquid (first fluid) supply side.
The convex portion 34 has a height of m to 5 mm.

According to this structure, the convex portion 3 on the support side of the membrane is formed.
Since the mixing of the liquid L can be promoted by 4, the structure of the pervaporation membrane unit is simplified. Instead of the convex portion 34 having a height of 0.5 mm to 5 mm, a concave portion having a depth of 0.5 mm to 5 mm can be provided. When these convex portions 34 and concave portions are provided, it is necessary to cover these convex portions 34 and concave portions with the pervaporation film 11a so as to prevent defects in the film.

FIG. 7 and FIG. 8 show a fourth embodiment.

The fluid mixing promoting means in the pervaporation membrane units 10G and 10H in which the fluid mixing promoting means is arranged on the membrane surface of the fourth embodiment shown in FIGS.
It is provided on the side of the outer member (cylindrical tube) 14 that surrounds the flow path on the liquid (first fluid) supply side.

As the fluid mixing promoting means, as shown in FIG. 7, a protrusion-shaped fluid mixing promoting member 35 is provided on the cylindrical tube 14 which is an outer member and reaches the vicinity of the membrane surface.
Alternatively, as shown in FIG. 8, there is a fluid-mixing promoting member 36 of a ring-shaped fluid which is supported by the cylindrical tube 14 and is disposed near the membrane surface.

The fluid mixing promoting members 35 and 36, which can be relatively easily arranged near the surface of the membrane, can stir the flow near the surface of the membrane to promote mass transfer and maintain high permeation efficiency of the membrane 11a.

FIG. 9 shows a fifth embodiment.

A pervaporation membrane unit 1 in which fluid mixing promoting means is arranged on the membrane surface of the fifth embodiment shown in FIG.
The fluid mixing promoting means in 0I is composed of a filling member 37 filled in the liquid (first fluid) supply side flow path.

The filling member 37 is 1 mmφ to 3 mmφ.
It is formed by small spheres or irregular shaped objects of a certain size. The filling member may be either an elastic body or a rigid body, and the filling density may be sparse or dense.

By the filled filling member 37, the liquid L flows between the filling members 37, and the flow direction and flow velocity in the vicinity of the film surface change, so that the stirring action and the mixing action occur. Therefore, the boundary layer can be stirred and the mixing of the substances can be promoted by a relatively simple method of filling the flow path with the filling member 37.

FIG. 10 shows a sixth embodiment.

The fluid mixing promoting means in the pervaporation membrane unit 10J in which the fluid mixing promoting means is arranged on the membrane surface of the sixth embodiment shown in FIG. 10 is mixed into the liquid (first fluid) supply side. And the stirrer 3 that moves with the liquid L
It is composed of 8.

As the stirrer 38, 1 mmφ to 3 m
It is formed by small spheres, cubes, or irregular shaped objects having a size of about mφ, is moved with the liquid L, and collides with each other or collides with the membrane tube 11 while passing through the vicinity of the membrane surface, thereby forming a boundary. The layers are agitated to facilitate mixing of the materials.
The stirrer 38 may be circulated together with the liquid L, may be separated from the liquid L on the outlet side of the membrane unit 10J and recovered, and may be mixed with the liquid L on the inlet side of the membrane unit 10J.

Then, in the pervaporation membrane units 10A to 10J equipped with these fluid mixing promoting means, the inflow amount of the liquid L is changed with time so that the flow velocity and flow direction of the liquid L near the membrane surface on the primary side. Change. Alternatively, by switching the inlet and the outlet of the liquid L,
The flow velocity and flow direction of the liquid L in the vicinity of the film surface on the primary side are changed.

By changing the flow velocity and the flow direction of the liquid (first fluid) L, the effect of the mixing promoting means for the respective fluids as described above can be promoted, and in particular, in one direction from the inlet to the outlet side. In the case of a moving stirrer 38 or a fluid mixing promotion member (not shown) that moves, the moved stirring bar 38 or fluid mixing promotion member can be returned to the original position.

Further, the pervaporation membrane units 10A to 10A having the fluid mixing promoting means arranged on the surface of any of these membranes.
By configuring a membrane separation device using a pervaporation membrane using 0J, it is possible to provide a compact and inexpensive membrane separation device with good separation efficiency.

[0088]

As is apparent from the above description, the separation membrane unit and the membrane separation device having the fluid mixing promoting means arranged on the membrane surface according to the present invention can exert the following effects. .

In the vicinity of the membrane surface on the first fluid side or on the membrane surface,
Permeation of the membrane surface is facilitated by arranging fluid mixing promoting means to disturb the flow of fluid near the membrane on the primary side, especially the boundary layer, to promote mass transfer near the membrane surface and to accelerate the mixture of substances. It is possible to prevent the concentration of the substance from lowering, reduce the concentration polarization, maintain a high permeation efficiency, and improve the separation efficiency by the membrane.

Further, with respect to the pervaporation membrane body formed in a tubular shape, the fluid mixing promoting means can be relatively easily manufactured in the vicinity of at least a part of the membrane surface, and the outer periphery is rotationally moved. If it is composed of a vibrating or moving fluid mixing promoting member such as a stirring member, the flow of the first fluid in the vicinity of the membrane surface is disturbed more effectively, and the movement of the substance in the first fluid and the substance Can promote mixing.

Further, the fluid mixing promoting means is an outer member that surrounds a convex portion or a concave portion provided on the surface of the support member of the membrane on the first fluid supply side or the flow passage on the first fluid supply side. The fluid mixing promoting member provided on the side, the filling member filling the flow path on the supply side of the first fluid, and the first fluid mixed with the first fluid,
It can be configured with an agitator that moves together with the first fluid, and the fluid mixing promoting means can be arranged relatively easily in the vicinity of the membrane surface.

Further, in the separation membrane unit, the inflow amount of the first fluid is temporally changed, or the inlet and outlet of the first fluid are switched, so that the primary fluid in the vicinity of the membrane surface can be removed. The mixing effect can be further improved by changing the flow velocity and the flow direction of the fluid of No. 1.

When the membrane separation device is constructed using the separation membrane unit in which the fluid mixing promoting means is arranged on the surface of these membranes, a compact and inexpensive membrane separation device having good separation efficiency can be provided.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a first example of a separation membrane unit in which fluid mixing promoting means is arranged on the membrane surface of the first embodiment according to the present invention.

FIG. 2 is a schematic configuration diagram showing a second example of a separation membrane unit in which fluid mixing promoting means is arranged on the membrane surface of the first embodiment according to the present invention.

FIG. 3 is a schematic configuration diagram showing a third example of a separation membrane unit in which fluid mixing promoting means is arranged on the membrane surface of the first embodiment according to the present invention.

FIG. 4 is a schematic configuration diagram showing a first example of a separation membrane unit in which fluid mixing promoting means is arranged on the membrane surface of the second embodiment according to the present invention.

FIG. 5 is a schematic configuration diagram showing a second example of a separation membrane unit in which fluid mixing promoting means is arranged on the membrane surface of the second embodiment according to the present invention.

FIG. 6 is a schematic configuration diagram showing an example of a separation membrane unit in which a fluid mixing promoting means is arranged on the membrane surface of a third embodiment according to the present invention.

FIG. 7 is a schematic configuration diagram showing a first example of a separation membrane unit in which fluid mixing promoting means is arranged on the membrane surface of the fourth embodiment according to the present invention.

FIG. 8 is a schematic configuration diagram showing a second example of a separation membrane unit in which fluid mixing promoting means is arranged on the membrane surface of the fourth embodiment according to the present invention.

FIG. 9 is a schematic configuration diagram showing an example of a separation membrane unit in which fluid mixing promoting means is arranged on the membrane surface of a fifth embodiment according to the present invention.

FIG. 10 is a schematic configuration diagram showing an example of a separation membrane unit in which fluid mixing promoting means is arranged on the membrane surface of the sixth embodiment according to the present invention.

FIG. 11 is a schematic configuration diagram showing an example of a pervaporation membrane unit that holds one membrane tube with a double-tube structure of the related art.

FIG. 12 is a schematic configuration diagram showing an example of a pervaporation membrane unit that holds a plurality of membrane tubes of a conventional technique.

[Explanation of symbols]

10A to 10J Pervaporation membrane (separation membrane) unit (double tube structure) 11 Membrane tube 11a Permeation vaporization membrane (separation membrane) 14 Cylindrical tube (outer member) 30A Coil spring (coil-shaped member) 31A Cylindrical member (vibration part) 31B Iron piece (vibrating part) 34 Convex part (fluid mixing promoting means) 35 Protruding fluid mixing promoting member (fluid mixing promoting means) 36 Ring-shaped fluid mixing promoting member (fluid mixing promoting means) 37 Filling member (fluid mixing promoting means) 38 Stirrer (fluid mixing promoting means) L fluid (first fluid) G gas (second fluid)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Etsuo Sugimoto             Mitsui Shipbuilding, 3-1-1 Tamama, Tamano City, Okayama Prefecture             Tamano Works Co., Ltd. F-term (reference) 4D006 GA25 HA28 JA32A JA33A                       KA41 KA45 KB02 KB30 MA02                       MA22 MB06 MB09 MB11 MB15                       MC03 MC57 PA04 PB14 PB65                       PC01

Claims (14)

[Claims] 1. A first fluid is supplied to the primary side of a separation membrane having pores at the molecular level and the secondary side of the separation membrane is evacuated, or a second fluid is supplied to the secondary side. Then, in the separation membrane unit that selectively extracts the substance mixed in the first fluid to the secondary side, the first membrane is formed near the membrane surface on the primary side of the separation membrane or in the membrane surface. A separation membrane unit in which fluid mixing promoting means is arranged on a membrane surface, wherein fluid mixing promoting means for mixing fluids inside and outside a boundary layer of fluids is arranged. 2. A liquid as the first fluid is supplied to the primary side of a pervaporation membrane as a separation membrane having pores at the molecular level, and the secondary side of the pervaporation membrane is evacuated, or , Supplying the gas as the second fluid to the secondary side,
In the membrane unit for selectively extracting the substance mixed in the liquid to the secondary side, a fluid mixing promoting means is arranged near or on the membrane surface of the primary side of the pervaporation membrane. A separation membrane unit having fluid mixing promoting means arranged on the membrane surface according to claim 1. 3. The fluid on the membrane surface according to claim 1, wherein the fluid-mixing promoting means is a fluid-mixing promoting member that vibrates or moves at least in a portion near the membrane surface. A separation membrane unit in which the mixing promoting means of is arranged. 4. The coil-shaped member in which the separation membrane is formed on an outer peripheral surface of a support body formed in a cylindrical shape, and the fluid mixing promoting means is arranged around the support body in the cylindrical shape. 4. The separation membrane unit having fluid mixing promoting means arranged on the membrane surface according to claim 3. 5. The fluid mixing promoting means is arranged on the membrane surface according to claim 3 or 4, wherein the vibrating fluid mixing promoting member is configured to be a part of a vibration system. Separation membrane unit. 6. A fluid mixing promoting means is arranged on the membrane surface according to claim 3, wherein a vibrating portion is provided in a part of said vibrating fluid mixing promoting member. Separation membrane unit. 7. The separation membrane is formed on the outer peripheral surface of a support body formed in a cylindrical shape, and the fluid mixing promoting means is arranged on the outer circumference of the support body in the cylindrical shape. The separation membrane unit having fluid mixing promoting means arranged on the membrane surface according to claim 3, which is a stirring member that rotates and moves. 8. The fluid mixing promoting means is provided on the surface of the support member of the membrane on the supply side of the first fluid.
mm-5 mm height of the protrusion, or 0.5 mm-5 mm
3. A separation membrane unit having a fluid mixing promoting means arranged on the membrane surface according to claim 1 or 2, wherein the separation membrane unit is a recess having a depth of. 9. The fluid mixing promoting means is a fluid mixing promoting member provided on the outer member side surrounding the flow path on the supply side of the first fluid.
A separation membrane unit in which fluid mixing promoting means is arranged on the membrane surface. 10. The fluid mixing promoting means comprises:
3. A separation membrane unit having a fluid mixing promoting means arranged on the membrane surface according to claim 1 or 2, which is a filling member filled in a flow passage on the fluid supply side. 11. The first fluid mixing promoting means is the first fluid mixing promoting means.
The separation membrane unit having fluid mixing promoting means arranged on the membrane surface according to claim 1 or 2, which is an agitator that is mixed in the fluid and moves together with the first fluid. 12. The flow rate and flow direction of the first fluid in the vicinity of the membrane surface on the primary side are changed by temporally changing the inflow amount of the first fluid into the separation membrane unit. A separation membrane unit having fluid mixing promoting means arranged on the membrane surface according to any one of claims 1 to 11. 13. In the separation membrane unit, the flow velocity and the flow direction of the first fluid in the vicinity of the membrane surface on the primary side are changed by switching an inlet and an outlet of the first fluid. A separation membrane unit having fluid mixing promoting means arranged on the membrane surface according to any one of claims 1 to 12. 14. A membrane separation device comprising a separation membrane unit having a fluid mixing promoting means arranged on the membrane surface according to any one of claims 1 to 13.