JP6553419B2 - Separation membrane support, separation membrane structure and separation membrane structure module - Google Patents

Description

  The present invention relates to a separation membrane support, a separation membrane structure, and a separation membrane structure module.

  As a separation membrane structure used for solid-liquid separation, solvent dehydration, etc., for example, there is one provided with a separation membrane and a separation membrane support that supports the separation membrane (see Patent Document 1). The separation membrane support is a porous columnar base material and a plurality of cells that are provided along the axial direction of the base material so as to penetrate both axial end surfaces of the base material and distribute the fluid to be treated And. A separation membrane for separating the fluid to be treated is provided on the inner wall surface of the cell of the separation membrane support.

JP 2007-237109 A

  However, in the conventional separation membrane structure, cells having the same cross-sectional area are arranged, for example, in the radial direction (from the central portion toward the outer peripheral portion) at equal intervals in a cross section orthogonal to the axial direction. Here, in the separation membrane structure, the fluid after separation processing which has passed through the separation membrane passes through the inside of the base material and is taken out from the outer peripheral surface of the base material.

  Therefore, the fluid that has passed through the separation membrane provided in the cells in the center of the substrate passes through the inside of the substrate compared to the fluid that passes through the separation membrane provided in the cells in the outer periphery of the substrate. The distance to reach the outer peripheral surface of In addition, the fluid that has passed through the separation membrane provided in the cell at the center of the substrate interferes with the fluid that has passed through the separation membrane provided in the cell at the outer peripheral portion of the substrate. The amount of the fluid to be treated passing through the separation membrane provided in the central cell of the

  This causes a difference in the efficiency of the separation treatment with the separation membrane between the cells in the central portion and the cells in the outer peripheral portion of the base material. Furthermore, since the cell at the outer peripheral portion of the base material has a higher separation efficiency (that is, the separation frequency is higher) than the cell at the central portion, solid matter adheres to the surface of the separation membrane in the cell at the outer peripheral portion of the base material. Occurrence of membrane clogging (fouling) due to the occurrence of a problem arises that stable separation treatment cannot be performed for a long time as a separation membrane structure.

  The present invention has been made in view of such a background, and can provide a separation membrane that can reduce the difference in separation treatment efficiency between the inner cell and the outer cell in the base material and can improve the separation treatment performance. It is an object of the present invention to provide a support, a separation membrane structure and a separation membrane structure module.

  A separation membrane support according to one aspect of the present invention is a separation membrane support that supports a separation membrane for separating a fluid to be treated, and is a porous columnar base material, and the base material is a shaft. A plurality of cells formed so as to penetrate in a direction, and a plurality of cells that are concentrically similar to the outer shape of the base material with the center of gravity of the base material as a base point in a cross section orthogonal to the axial direction of the base material When a plurality of cells are arranged side by side on each of the virtual lines and a plurality of cells arranged on the same virtual line are taken as one cell group, the cross section A plurality of the cell groups are provided, and among the plurality of cell groups, a cell group region including two or more of the cell groups disposed adjacent to the radial direction of the base material is provided, In the group region, the planes of the cells in the cell group on the outer side in the radial direction of the base material Interval is wider than the average spacing of the cells between in the cell group of radially inward of the substrate.

  In the separation membrane support, a plurality of cell groups are provided in a cross section orthogonal to the axial direction of the base material, and two of the plurality of cell groups are arranged adjacent to each other in the radial direction of the base material. A cell group region composed of the above cell groups is provided. In the cell group region, the average interval between cells in the cell group on the outer side in the radial direction of the substrate is wider than the average interval between cells in the cell group on the inner side in the radial direction of the substrate.

  Therefore, for example, a separation membrane is provided on the inner wall surface of the cell, and the fluid after separation processing that has passed through the separation membrane passes inside the porous base material and flows out from the outer peripheral surface of the base material to the outside In this case, the fluid after the separation process that has passed through the cell separation membrane in the cell group inside the substrate is prevented from interfering with the fluid after the separation process that has passed through the cell separation membrane in the cell group outside the substrate. It is possible to increase the separation processing efficiency of the cell separation membrane in the cell group inside the substrate (hereinafter simply referred to as separation processing efficiency as appropriate). And the difference (variation) of the separation processing efficiency between the cell inside the substrate (cell in the inner cell group) and the cell outside the substrate (cell in the outer cell group) can be reduced. That is, the separation processing efficiency between the cell inside the substrate and the cell outside the substrate can be made uniform.

  This is because the adjacent cells and cells in the group of cells disposed radially outward of the substrate are larger than the average spacing between the adjacent cells and cells in the group of cells disposed radially inward of the substrate. Because the average spacing is wider, the flow of separated fluid that has penetrated from the cells in the cells inside the substrate into the interior of the substrate is separated from the cells in the cells outside the substrate. It is because it becomes a structure which the later fluid does not inhibit easily.

  Thereby, it is possible to suppress the occurrence of membrane clogging (fouling) due to the solid matter adhering to the surface of the separation membrane in a cell (cell group) at a specific location as in the past. Then, efficient and stable separation processing can be performed for a long period of time, and separation processing performance can be improved.

  As described above, in the cell group region of the separation membrane structure, the average interval between the cells in the cell group on the outer side in the radial direction of the base material is in the cell group on the inner side in the radial direction of the base material. It is wider than the average interval between the cells. That is, for example, when comparing two arbitrarily selected cell groups among a plurality of cell groups in the cell group region, the average interval between cells in the inner cell group is the average interval between cells in the outer cell group. Is wider than.

  Further, the cell group region including the innermost cell group in the radial direction of the base material may be provided on the cross section of the base material. In this case, the effect of reducing the difference (variation) in the separation processing efficiency between the inner cell and the outer cell in the base material can be sufficiently exhibited.

  Further, in the cell group region, of two cell groups adjacent to each other in the radial direction of the base material, an average interval between the cells in the inner cell group is D1, and the cells in the outer cell group are When the average interval is D2, D2 / D1 may be 1.5 or more. In this case, the difference (variation) in separation processing efficiency between the inner cell and the outer cell in the substrate can be further reduced.

  In the cell group region, the average cross-sectional area of the cells in the cell group on the outer side in the radial direction of the base material is larger than the average cross-sectional area of the cells in the cell group on the inner side in the radial direction of the base material. It may be small. In this case, the difference (variation) in separation processing efficiency between the inner cell and the outer cell in the substrate can be further reduced.

  In the cell group region, the intervals between the cells in the same cell group may be substantially equal. In this case, the difference (variation) in the separation processing efficiency between cells in the same cell group can be reduced. In addition, each space | interval of cells is substantially equal means that the space | interval of cells is equal or close | similar, for example, a manufacturing error etc. are accept | permitted.

  In the cell group region, the cross-sectional areas of the cells in the same cell group may be substantially the same. In this case, the difference (variation) in separation processing efficiency between cells in the same cell group can be reduced. In addition, that the cross-sectional area of each cell is substantially the same means that the cross-sectional area of each cell is the same or almost the same, and for example, an error or the like in manufacturing is allowed.

The separation membrane structure which is another aspect of the present invention comprises the separation membrane support and the separation membrane provided on the inner wall surface of the cell of the separation membrane support.
The separation membrane structure includes the above-described separation membrane support. Therefore, the difference (variation) in separation processing efficiency between the inner cells (cells of the inner cell group) and the outer cells (cells of the outer cell group) in the base material can be reduced. Thereby, efficient and stable separation processing can be performed for a long period of time, and separation processing performance can be improved.

A separation membrane structure module according to still another aspect of the present invention includes the separation membrane structure, and a housing that accommodates the separation membrane structure therein.
The separation membrane structure module includes a separation membrane structure having the above-described separation membrane support. Therefore, the difference (variation) in separation processing efficiency between the inner cells (cells of the inner cell group) and the outer cells (cells of the outer cell group) in the base material can be reduced. Thereby, efficient and stable separation processing can be performed for a long period of time, and separation processing performance can be improved.

  As described above, according to the present invention, the separation membrane support and the separation membrane that can reduce the difference in separation treatment efficiency between the inner cell and the outer cell of the base material due to the separation membrane and improve the separation treatment performance. A structure and separation membrane structure module can be provided.

FIG. 3 is a cross-sectional explanatory view schematically showing the structure of the separation membrane structure module in the first exemplary embodiment. FIG. 2 is a perspective view showing a separation membrane structure in Embodiment 1. FIG. 3 is a cross-sectional explanatory view showing a cross section (cross section taken along the line III-III in FIG. 2) of the base material of the separation membrane structure (separation membrane support) in the first embodiment. FIG. 10 is a cross-sectional explanatory view showing a cross section of a base of a separation membrane structure (separation membrane support) in Embodiment 2. FIG. 14 is a cross-sectional explanatory view showing a cross section of a base of a separation membrane structure (separation membrane support) in Embodiment 3. FIG. 14 is a cross-sectional explanatory view showing a cross section of a base of a separation membrane structure (separation membrane support) in Embodiment 4. It is cross-sectional explanatory drawing which shows the cross section of the base material of the separation-membrane structure (separation-membrane support body) in a comparative example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
As shown in FIG. 1, the separation membrane structure module 1 of the present embodiment includes a separation membrane structure 11 and a housing 12 that houses the separation membrane structure 11 therein.

  As shown in FIGS. 1 and 2, the separation membrane structure 11 in the separation membrane structure module 1 includes a separation membrane support 21, a separation membrane 22, a first seal layer 23, and a second seal layer 24. I have. The separation membrane support 21 includes a base 31 and a plurality of cells 32.

  The substrate 31 is a cylindrical porous body made of alumina and having a diameter of 30 mm and a total length of about 1000 mm. The base material 31 has a circular first end surface 311, a circular second end surface 312, and an outer peripheral surface 313. The base 31 is provided with a plurality of cells 32. Each cell 32 is provided along the axial direction of the base material 31 so as to penetrate (communicate with) both end surfaces (first end surface 311 and second end surface 312) of the base material 31 in the axial direction. Each cell 32 forms a flow path through which the fluid to be treated is circulated. The arrangement of the cells 32 will be described later.

  The separation membrane 22 is an alumina porous membrane having many fine pores having an average pore size smaller than that of the base material 31. The separation membrane 22 is provided on the inner wall surface 321 of the cell 32 of the base 31. The separation membrane 22 is a membrane for separating and treating (filtering) the fluid to be treated flowing in the cells 32 of the base material 31. Between the inner wall surface 321 of the cell 32 of the base material 31 and the separation film 22, an intermediate film (not shown) serving as a base of the separation film 22 is provided.

  The first seal layer 23 covers the first end surface 311 of the base material 31, the vicinity of the first end surface 311 of the separation membrane 22, and the vicinity of the first end surface 311 of the outer peripheral surface 313 of the base material 31. The first seal layer 23 is formed on the surface of the separation membrane 22 and the outer peripheral surface 313 of the base material 31 continuously from the first end surface 311 of the base material 31.

  The second seal layer 24 covers the second end surface 312 of the base material 31, the vicinity of the second end surface 312 of the separation membrane 22, and the vicinity of the second end surface 312 of the outer peripheral surface 313 of the base material 31. The second seal layer 24 is formed on the surface of the separation membrane 22 and the outer peripheral surface 313 of the base 31 continuously from the second end surface 312 of the base 31.

  If the material constituting the first seal layer 23 and the second seal layer 24 can prevent the fluid to be treated from leaking through the separation membrane support 21 that is a porous body without passing through the separation membrane 22, There is no particular limitation. The first seal layer 23 and the second seal layer 24 flow into the pores of the base material 31 and the separation membrane 22 and enhance the adhesion between the base material 31 and the separation membrane 22.

  As shown in FIG. 1, the casing 12 in the separation membrane structure module 1 is a hollow metal container having a space for accommodating the separation membrane structure 11 therein. The casing 12 has an inlet 131 for introducing the fluid to be treated, an outlet 132 for discharging the concentrated liquid in which the liquid to be treated is concentrated by the separation membrane structure 11, and the fluid to be treated is filtered by the separation membrane structure 11. It has the 1st recovery port 133 and the 2nd recovery port 134 which collect the filtrate which was carried out.

  An O-ring 141 is attached on the first seal layer 23 provided on the outer peripheral surface 313 of the base material 31 in the separation membrane structure 11. An annular metal blocking member 142 is fitted to the first end face 311 side of the separation membrane structure 11 via the O-ring 141. An O-ring 151 is attached on the second seal layer 24 provided on the outer peripheral surface 313 of the base material 31 in the separation membrane structure 11. An annular metal blocking member 152 is fitted on the second end face 312 side of the separation membrane structure 11 via the O-ring 151. The separation membrane structure 11 is housed in the housing 12 via O-rings 143 and 153 between the inner wall surface of the housing 12 and the metal blocking members 142 and 152.

  The first space 161 surrounded by the first end surface 311 of the base 31 and the inner wall surface of the housing 12 and the second end surface of the base 31 in the housing 12 in which the separation membrane structure 11 is accommodated. A second space 162 surrounded by 312 and the inner wall surface of the housing 12 and a third space 163 surrounded by the outer peripheral surface 313 of the base 31 and the inner wall surface of the housing 12 are formed. The first space 161, the second space 162, and the third space 163 are each kept hermetically sealed.

  The fluid to be treated introduced from the inlet 131 of the housing 12 into the first space 161 of the housing 12 has only components that can pass through the separation membrane 22 while flowing through the cells 32 of the separation membrane 22 structure 11. It passes through the separation membrane 22. The filtrate having passed through the separation membrane 22 passes through the inside of the base material 31 and flows out from the outer peripheral surface 313 of the base material 31 to the third space 163 of the housing 12, and then the first recovery port 133 and the second recovery port 134. Further, the concentrated liquid that has passed through the separation membrane structure 11 flows into the second space 162 of the housing 12 and is then discharged from the discharge port 132.

  Next, the arrangement of the cells 32 in the base 31 of the separation membrane structure 11 (separation membrane support 21) will be described with reference to FIGS. 3 (A) and 3 (B). 3A and 3B, illustration of the separation film 22 formed on the inner wall surface 321 of the cell 32 is omitted (FIGS. 4A and 4B (to be described later)). The same applies to A) and (B).

  As shown in FIGS. 3A and 3B, in the cross section 314 orthogonal to the axial direction of the base material 31, the outer shape of the base material 31 is concentric with the center of gravity (center 40) of the base material 31 as a base point. In the case of drawing a plurality of virtual lines 41, the plurality of cells 32 are arranged side by side on each of the virtual lines 41. The “center of gravity” means “the center of gravity in a plane figure”. That is, the center of gravity of the base 31 means the center of gravity in the cross-sectional figure of the base 31. In the present embodiment, the cross section 314 of the base material 31 is circular, and the center of gravity of the base material 31 is at the same position as the center 40 of the base material 31.

  In the present embodiment, three virtual lines 41 of a first virtual line 41a, a second virtual line 41b, and a third virtual line 41c are drawn on the cross section 314 of the base 31 from the inside to the outside in the radial direction. ing. The three virtual lines 41 are drawn concentrically with the center 40 of the base material 31 as a base point. That is, the three virtual lines 41 are different in distance from the center 40 of the base 31 respectively. The distance from the center 40 of the base material 31 is 4.7 mm for the first imaginary line 41 a, 9.0 mm for the second imaginary line 41 b, and 13.0 mm for the third imaginary line 41 c. In addition, the distance from the center 40 of the base material 31 to each virtual line 41 can be set arbitrarily. The shape of each imaginary line 41 is similar to the outer shape of the base 31 and is circular.

  A plurality of cells 32 having a circular cross section are disposed on the imaginary lines 41 in the cross section 314 of the base 31. Six cells 32 (diameter 3.6 mm) are disposed on the first virtual line 41 a. Nine cells 32 (diameter 3.2 mm) are disposed on the second virtual line 41 b. Twenty-four cells 32 (2.4 mm in diameter) are disposed on the third virtual line 41 c. The center of each cell 32 is located substantially on the imaginary line 41. In the cross section 314 of the base material 31, one cell 32 (diameter 4.5 mm) is arranged at the center 40 of the base material 31. The center of the cell 32 is located at the center 40 of the base 31.

  As shown in the figure, when a plurality of cells 32 arranged on the same virtual line 41 are used as one cell group 51, a plurality of cell groups 51 are provided on the cross section 314 of the base material 31. . In the present embodiment, the cross section 314 of the base material 31 is provided with three cell groups 51 of a first cell group 51a, a second cell group 52b, and a third cell group 51c from the inner side to the outer side in the radial direction. ing. The first cell group 51a includes six cells 32 arranged on the first virtual line 41a. The second cell group 52b is composed of nine cells 32 arranged on the second virtual line 41b. The third cell group 51c is composed of 24 cells 32 arranged on the third virtual line 41c.

  In addition, in the cross section 314 of the base material 31, a cell group region 61 including two or more cell groups 51 arranged adjacent to each other in the radial direction of the base material 31 among the plurality of cell groups 51 (FIG. 3B ) Between the inner dotted line A and the outer dotted line B). In the present embodiment, a cell group region 61 including a first cell group 51a and a second cell group 51b arranged adjacent to each other in the radial direction among the three cell groups 51 is provided in the cross section 314 of the base material 31. It has been. The cell group region 61 includes a first cell group 51 a that is the innermost cell group 51 in the radial direction of the base material 31.

  Note that the cell 32 arranged at the center 40 of the substrate 31 exists outside the cell group region 61 (inside the cell group region 61) and is not included in the cell group region 61. The outermost third cell group 51c in the radial direction of the base material 31 (cell 32 constituting the third cell group 51c) also exists outside the cell group region 61 (outside the cell group region 61). Not included.

  As shown in the figure, in the cell group area 61, the intervals between the cells 32 in the same cell group 51 are substantially equal. That is, the intervals between the cells 32 in the first cell group 51a are substantially equal. The intervals between the cells 32 in the second cell group 51b are substantially equal.

  In the cell group region 61, the average interval between the cells 32 in the cell group 51 on the outer side in the radial direction of the base material 31 is larger than the average interval between the cells 32 in the cell group 51 on the inner side in the radial direction of the base material 31. It is getting wider. In the present embodiment, the average interval between the cells 32 in the second cell group 51b outside the cell group region 61 is wider than the average interval between the cells 32 in the first cell group 51a inside. Furthermore, the intervals between the cells 32 in the outer second cell group 51b are wider than the intervals between the cells 32 in the inner first cell group 51a.

  Here, the interval between the cells 32 in the same cell group 51 is a point at which the outer edge of one cell 32 of the two adjacent cells 32 intersects the virtual line 41 in the same cell group 51 (see FIG. 3 (A), and a point (P2 in FIG. 3A) of a straight line connecting a point (P2 in FIG. 3A) at which the outer edge of the other cell 32 and the imaginary line 41 intersect. Distance). The average interval between the cells 32 in the same cell group 51 refers to the average of the intervals between the cells 32 in the same cell group 51.

  Further, in the cell group region 61, of the two cell groups 51 adjacent to each other in the radial direction of the base material 31, the average interval between the cells 32 in the inner cell group 51 is D1, and the cells 32 in the outer cell group 51 are When the average interval is D2, D2 / D1 is 1.5 or more. In the present embodiment, among the first cell group 51a and the second cell group 52b adjacent in the radial direction of the base material 31, the average interval D1 between the cells 32 in the inner first cell group 51a is 1.31 mm, The average distance D2 between the cells 32 in the outer second cell group 51b is 3.04 mm. D2 / D1 is 2.31 and is 1.5 or more.

  As shown in the figure, in the cell group region 61, the cross-sectional areas of the cells 32 in the same cell group 51 are substantially the same. That is, the cross-sectional areas of the cells 32 in the first cell group 51a are substantially the same. The cross-sectional areas of the cells 32 in the second cell group 51b are substantially the same.

  In the cell group region 61, the average cross-sectional area of the cells 32 in the cell group 51 on the outer side in the radial direction of the base material 31 is larger than the average cross-sectional area of the cells 32 in the cell group 51 on the inner side in the radial direction of the base material 31. It is getting smaller. In the present embodiment, the average cross-sectional area of the cells 32 in the second cell group 51b outside the cell group region 61 is smaller than the average cross-sectional area of the cells 32 in the first cell group 51a inside. Furthermore, the cross-sectional area of each cell 32 in the outer second cell group 51b is smaller than the cross-sectional area of each cell 32 in the inner first cell group 51a. Here, the average cross-sectional area of the cells 32 in the same cell group 51 means the average cross-sectional area of each cell 32 in the same cell group 51.

  As shown in the figure, the intervals between the cells 32 in the third cell group 51c are substantially equal. The average interval between the cells 32 in the third cell group 51c is narrower than the average interval between the cells 32 in the second cell group 51b inside the third cell group 51c. Each interval between the cells 32 in the third cell group 51c is narrower than each interval between the cells 32 in the second cell group 51b inside the third cell group 51c.

  In addition, the cross-sectional areas of the cells 32 in the third cell group 51c are substantially the same. The average cross-sectional area of the cells 32 in the third cell group 51c is smaller than the average cross-sectional area of the cells 32 in the second cell group 51b located inside the third cell group 51c. The cross-sectional area of each cell 32 in the third cell group 51c is smaller than the cross-sectional area of each cell 32 in the second cell group 51b located inside the third cell group 51c.

  In the present embodiment, the third cell group 51c, which is the outermost cell group 51, is not included in the cell group region 61 as described above. The outermost cell group 51 is closest to the outer peripheral surface 313 of the base 31 of the separation membrane structure 11 and largely contributes to the separation processing amount of the fluid to be treated. Therefore, the outermost cell group 51 is included in the cell group area 61, and the diameter of the cells 32 of the outermost cell group 51 is reduced according to the rule in the above-mentioned cell group area 61, or the arrangement cell If the number is reduced, the separation processing capacity can be greatly reduced. Therefore, the outermost cell group 51 (in the present embodiment, the third cell group 51 c) is not included in the cell group area 61.

Next, a method for manufacturing the separation membrane structure 11 will be described.
<Step of preparing separation membrane support>
In this step, the separation membrane support 21 was produced. Specifically, 100 parts by weight of alumina, 10 parts by weight of methyl cell 32 loin, 25 parts by weight of water, and 5 parts by weight of a lubricant were mixed and kneaded with a mixer to obtain a clay for extrusion molding. Then, using an extrusion molding machine, a precursor of the separation membrane support 21 having an outer diameter of 30 mm and a predetermined arrangement of cells 32 was molded. Then, it dried for 12 hours in a 80 degreeC warm air dryer, and obtained the molded object before baking.

  Subsequently, the molded body before firing was fired in the air atmosphere to obtain a separation membrane support 21. Then, both ends of the separation membrane support 21 after firing were cut and polished, and the dimensions of the separation membrane support 21 were adjusted so that the total length would be 1000 mm. Thereby, the separation membrane support 21 provided with the base material 31 and the plurality of cells 32 was obtained.

<Intermediate film formation process>
In this step, on the inner wall surface 321 of the cell 32 of the separation membrane support 21, an intermediate film to be a base of the separation membrane 22 having separation ability was formed. Specifically, 100 parts by weight of alumina powder, 1.5 parts by weight of dispersant and 200 parts by weight of water were charged into a mixing pot, and pulverized and mixed for 24 hours on a rotating frame. And 30 weight part of organic binder was thrown in, and also mixed for 6 hours, and the alumina slurry was obtained.

  Next, the separation membrane support 21 was immersed in the alumina slurry, and the alumina slurry was brought into contact with each cell 32 to form a film. At this time, the side surface of the separation membrane support 21 was masked. Thereafter, the separation membrane support 21 was pulled up from the alumina slurry and dried in a hot air dryer at 80 ° C. for 12 hours. The dried separation membrane support 21 was fired in the air atmosphere to bake the interlayer. Thus, an intermediate film was formed on the inner wall surface 321 of the cell 32 of the separation membrane support 21.

<Separation membrane deposition process>
In this step, the separation film 22 having separation ability was formed on the intermediate film. Specifically, 100 parts by weight of alumina powder, 2.5 parts by weight of dispersant, and 200 parts by weight of water were charged into a mixing pot, and pulverized and mixed for 24 hours on a rotating frame. And 30 weight part of organic binder was thrown in, and also mixed for 6 hours, and the alumina slurry was obtained.

  Next, the separation membrane support 21 having an intermediate membrane formed therein was immersed in the alumina slurry, and the alumina slurry was brought into contact with each cell 32 to form a film. At this time, the side surfaces of the separation membrane support 21 were masked. Thereafter, the separation membrane support 21 was pulled up from the alumina slurry and dried in a hot air dryer at 80 ° C. for 12 hours. The dried separation membrane support 21 was fired in the air atmosphere to bake the separation membrane 22. Thereby, the separation film 22 was formed on the intermediate film.

<End face sealing process>
In this step, the first seal layer 23 and the second seal layer 24 were formed on both end surfaces (first end surface 311 and second end surface 312) of the base material 31 of the separation membrane support 21 and in the vicinity thereof. Specifically, the outer peripheral portion excluding 15 mm at both ends of the separation membrane support 21 on which the separation membrane 22 is formed is masked, and the range of both ends 15 mm of the separation membrane support 21 is immersed in a glass glaze slurry for separation. Both end surfaces of the membrane support 21 (base 31) and the vicinity thereof were coated. And it dried for 1 hour in an 80 degreeC warm air dryer. Thereafter, the glaze portion was baked in the atmosphere. Thereby, the first seal layer 23 and the second seal layer 24 were formed on both end surfaces of the base 31 of the separation membrane support 21 and in the vicinity thereof.

  As described above, the separation membrane support 21 (base material 31, cell 32), intermediate membrane, separation membrane 22, and first seal layer as shown in FIGS. 23 and the separation membrane structure 11 provided with the second seal layer 24 were obtained.

Next, the effect of this embodiment is demonstrated.
In the separation membrane structure 11 (separation membrane support 21) of the present embodiment, a plurality of cell groups 51 (first cell group 51a to third cell group 51c) are present in a cross section 314 orthogonal to the axial direction of the base material 31. And a cell composed of two or more cell groups 51 (a first cell group 51a and a second cell group 51b) arranged adjacent to each other in the radial direction of the base material 31 among the plurality of cell groups 51. A group area 61 is provided. Then, in the cell group region 61, the average distance between the cells 32 in the cell group 51 (second cell group 51b) on the outer side in the radial direction of the base material 31 is the cell group 51 on the inner side in the radial direction The average interval between cells 32 in one cell group 51a) is wider.

  Therefore, as in the present embodiment, the separation membrane 22 is provided on the inner wall surface 321 of the cell 32, and the fluid (filtrate) after the separation treatment that has passed through the separation membrane 22 passes through the inside of the substrate 31 that is porous. In the case of a structure that flows out from the outer peripheral surface 313 of the base material 31, the filtrate that has passed through the separation membrane 22 of the cell 32 in the cell group 51 (first cell group 51 a) inside the base material 31 is the base material. In the cell group 51 (second cell group 51b) outside the cell 31, interference with the filtrate passing through the separation membrane 22 of the cell 32 can be suppressed, and the separation membrane 22 of the cell 32 in the cell group 51 inside the base 31 Separation processing efficiency due to can be increased.

  And the difference (variation) in the separation processing efficiency between the cell 32 inside the base material 31 (cell 32 of the first cell group 51a) and the cell 32 outside the base material (cell 32 of the second cell group 51b) is reduced. it can. That is, the separation efficiency of the cells 32 inside the base material 31 (cells 32 of the first cell group 51a) and the cells 32 outside the base material 31 (cells 32 of the second cell group 51b) can be made uniform.

  Thereby, in the cell 32 (cell group 51) of the specific location like the past, it can suppress that the membrane | film | block obstruction | occlusion (fouling) by solid substance adhering to the surface of the separation membrane 22 generate | occur | produces. And an efficient and stable separation process (filtration) can be performed for a long time, and the separation processing performance (filtration performance) can be improved.

  Further, in the separation membrane structure 11 (separation membrane support 21) of the present embodiment, the innermost cell group 51 (first cell group 51a) in the radial direction of the base material 31 is formed on the cross section 314 of the base material 31. A cell group region 61 is provided. Therefore, an effect of reducing the difference (variation) in separation processing efficiency between the inner cell 32 (cell 32 of the first cell group 51a) and the outer cell 32 (cell 32 of the second cell group 51) in the base material 31. Can be fully demonstrated.

  Moreover, in the cell group area | region 61, in two cell groups 51 (1st cell group 51a, 2nd cell group 51b) adjacent to the radial direction of the base material 31, in an inner cell group (1st cell group 51a). When the average interval between the cells 32 is D1, and the average interval between the cells 32 in the outer cell group 51 (second cell group 51b) is D2, D2 / D1 is 1.5 or more. Therefore, the difference (variation) in separation processing efficiency between the inner cell 32 (cell 32 of the first cell group 51a) and the outer cell 32 (cell 32 of the second cell group 51b) in the base material 31 can be further reduced.

  In the cell group region 61, the average cross-sectional area of the cells 32 in the cell group 51 (second cell group 51 b) on the outer side in the radial direction of the base material 31 is the cell group 51 (first in the radial direction on the base material 31). It is smaller than the average cross-sectional area of the cell 32 in the one cell group 51a). Therefore, the difference (variation) in separation processing efficiency between the inner cell 32 (cell 32 of the first cell group 51a) and the outer cell 32 (cell 32 of the second cell group 51b) in the base material 31 can be further reduced.

  Further, in the cell group region 61, the intervals between the cells 32 in the same cell group 51 are substantially equal. Therefore, the difference (variation) in the separation processing efficiency between the cells 32 in the same cell group 51 can be reduced.

  In the cell group region 61, the cross-sectional areas of the cells 32 in the same cell group 51 are substantially the same. Therefore, the difference (variation) in the separation processing efficiency between the cells 32 in the same cell group 51 can be reduced.

  Further, the outermost cell group 51 in the radial direction of the base material 31, that is, the cell group 51 (third cell group 51 c) closest to the outer peripheral surface 313 of the base material 31 is the inner cell group 51 (second cell group). The intervals between the cells 32 and the average spacing between the cells 32 are narrower than 51 b), and the cross-sectional area of each cell 32 and the average cross-sectional area of the cells 32 are smaller. Therefore, as in the present embodiment, in the case of a configuration in which the fluid (filtrate) after the separation process that has passed through the separation membrane 22 passes through the inside of the base material 31 and flows out from the outer peripheral surface 313 of the base material 31, The separation processing efficiency of the separation membrane structure 11 as a whole can be enhanced.

  The intervals between the cells 32 in the outermost cell group 51 in the radial direction of the substrate 31, that is, the cell group 51 (third cell group 51 c) closest to the outer peripheral surface 313 of the substrate 31 are substantially equal. The cross-sectional areas of the cells 32 are substantially the same. Therefore, the separation processing efficiency of the separation membrane structure 11 as a whole can be further increased.

  Further, the separation membrane structure module 1 of the present embodiment includes the separation membrane structure 11 having the separation membrane support 21 described above. Therefore, the difference (variation) in separation processing efficiency between the inner cell 32 (cell 32 of the first cell group 51a) and the outer cell 32 (cell 32 of the second cell group 51b) in the base material 31 can be reduced. Thereby, efficient and stable separation processing can be performed for a long period of time, and separation processing performance can be improved.

  Thus, according to the present embodiment, the difference in separation processing efficiency by the separation membrane 22 between the inner cell 32 and the outer cell 32 in the substrate 31 can be reduced, and the separation processing performance can be improved. The separation membrane 22 support 21, the separation membrane 22 structure 11, and the separation membrane 22 structure 11 module 1 can be provided.

Second Embodiment
The present embodiment is an example in which the arrangement of the cells 32 in the base 31 of the separation membrane structure 11 (separation membrane support 21) is changed as shown in FIGS. 4 (A) and 4 (B). In addition, description is abbreviate | omitted about the structure and effect similar to Embodiment 1. FIG.

  As shown in the figure, in the cross section 314 of the base material 31, the distance from the center 40 of the base material 31 is 4.8 mm for the first virtual line 41a, 9.0 mm for the second virtual line 41 b, and the third virtual line 41c is 12.7 mm. Five cells 32 (diameter 3.6 mm) are disposed on the first virtual line 41 a. Ten cells 32 (diameter 3.2 mm) are disposed on the second virtual line 41 b. Twenty cells 32 (2.4 mm in diameter) are disposed on the third virtual line 41 c. One cell 32 (4.5 mm in diameter) is arranged at the center 40 of the substrate 31.

  Further, in the cell group region 61, the average distance D1 between the cells 32 in the inner first cell group 51a is 2.41 mm, and the average distance D2 between the cells 32 in the outer second cell group 51b is 2.49 mm. is there. D2 / D1 is 1.03. Therefore, unlike Embodiment 1, D2 / D1 is less than 1.5.

(Embodiment 3)
This embodiment is an example in which the arrangement of the cells 32 in the base 31 of the separation membrane structure 11 (separation membrane support 21) is changed as shown in FIGS. 5 (A) and 5 (B). Description of the same configuration and effects as those of the first embodiment will be omitted.

  As shown in the figure, in the cross section 314 of the base material 31, the distance from the center 40 of the base material 31 is 4.6 mm for the first virtual line 41a, 9.2 mm for the second virtual line 41 b, and the third virtual line 41c is 12.9 mm. Five cells 32 (diameter 4.5 mm) are disposed on the first virtual line 41 a. Ten cells 32 (diameter 3.6 mm) are arranged on the second virtual line 41 b. Twenty cells 32 (diameter 2.6 mm) are arranged on the third virtual line 41 c. Further, unlike the first embodiment, the cell 32 is not disposed at the center 40 of the base 31. Further, the cell group region 61 is a region inside the dotted line B in FIG.

  In the cell group region 61, the average interval D1 between the cells 32 in the first inner cell group 51a is 1.13 mm, and the average interval D2 between the cells 32 in the second outer cell group 51b is 2.18 mm. is there. D2 / D1 is 1.93 and is 1.5 or more.

(Embodiment 4)
The present embodiment is an example in which the shape of the base 31 of the separation membrane structure 11 (separation membrane support 21) and the arrangement of the cells 32 are changed as shown in FIGS. 6 (A) and 6 (B). In addition, description is abbreviate | omitted about the structure and effect similar to Embodiment 1. FIG.

  As shown in the figure, the base material 31 is formed in a hexagonal column shape. In the cross section 314 of the base material 31, the shape of each virtual line 41 is similar to the external shape of the base material 31, and is a hexagonal shape. Six cells 32 (diameter 3.6 mm) are arranged on the first imaginary line. Twelve cells 32 (diameter 3.2 mm) are arranged on the second imaginary line. On the third imaginary line, 24 cells 32 (diameter 2.4 mm) are arranged. At the center of gravity 400 of the base material 31, one cell 32 (diameter 4.5 mm) is disposed.

  In the cell group region 61, the average distance D2 between the cells 32 in the outer second cell group 51b is wider than the average distance D1 between the cells 32 in the inner first cell group 51a. D2 / D1 is 1.5 or more.

(Experimental example)
In this experimental example, a plurality of separation membrane structures were prepared. Then, a model liquid filtration test was performed on each separation membrane structure to compare the separation processing performance (filtration performance) of each separation membrane structure.

  As the separation membrane structure, the separation membrane structure 11 of the first embodiment (FIGS. 1 to 3A, 3B), which is an example of the present invention, and the separation membrane structure 11 of the second embodiment (FIG. 4). (A), (B), the separation membrane structure 11 (FIG. 5 (A), (B)) of Embodiment 3 was prepared. Moreover, the separation membrane structure 911 (FIG. 7 mentioned later) of a comparative example was also prepared. Hereinafter, the separation membrane structure 911 of the comparative example will be described with reference to FIG. In addition, description is abbreviate | omitted about the structure similar to the separation-membrane structure 11 (FIG. 1-5 (A), (B)) of Embodiment 1-3.

  As shown in FIG. 7, in the cross section 314 of the base 31, the distance from the center 40 of the base 31 is 4.1 mm for the first virtual line 41 a, 8.2 mm for the second virtual line 41 b, and the third virtual line 41c is 12.3 mm. The three virtual lines 41 are equally spaced in the radial direction of the base material 31.

  In the cross section 314 of the base material 31, six cells 32 are arranged on the first virtual line 41a. Twelve cells 32 are arranged on the second virtual line 41 b. Eighteen cells 32 are arranged on the third virtual line 41c. One cell 32 is arranged at the center 40 of the substrate 31. The cells 32 are all the same size and 3.0 mm in diameter.

  The average interval d1 between the cells 32 in the first cell group 51a is 1.39 mm, and the average interval d2 between the cells 32 in the second cell group 51b is 1.30 mm. d2 / d1 is 0.94. The intervals between the cells 32 in the same cell group 51 are substantially equal. That is, the intervals between the cells 32 in the first cell group 51a, the second cell group 51b, and the third cell group 51c are substantially equal.

The surface area (membrane area) of the separation membrane formed on the inner surface of the cell of the base material is 0.345 m ^{2 in} the separation membrane structure of Embodiment 1 which is an example of the present invention, and the separation membrane structure of Embodiment 2. body 0.352m ^2, the separation membrane structure of the third embodiment is 0.349m ^2, separating membrane structure of Comparative example is 0.349m ^2.

  Next, a filtration test using a model solution was performed on each prepared separation membrane structure. Specifically, for the separation membrane structure, a model liquid was supplied from a supply tank, and filtration was performed by a cross flow filtration method. Note that the concentrated solution and filtrate that have passed through the separation membrane structure (separation membrane) are made into a piping system that returns to the supply tank again, and the concentration of the model liquid (processed fluid) supplied from the supply tank is always constant. I did it. As a model solution, a solution obtained by dissolving skim milk powder with water was used. The filtration conditions were such that the transmembrane pressure difference was 0.2 MPa, the linear velocity for circulating the model liquid was 2.3 m / sec, and the liquid temperature of the model liquid was 25 ° C.

  Then, the water permeability of the separation membrane structure was measured, and the reduction rate of the water permeability after a predetermined time was determined. The water permeability is the amount of model liquid that has passed through the separation membrane per unit area per unit time. The reduction rate of the water permeability indicates the rate of reduction of the water permeability after the filtration operation for a predetermined time (30 minutes) with respect to the water permeability at the start of filtration.

The separation membrane structure of Embodiment 1, which is an example of the present invention, had a water permeability of 34 L / m ² · hr at the start of filtration, and a reduction rate of the water permeability after a predetermined time filtration operation was 4%. . Moreover, the separation membrane structure of Embodiment 2 had a water permeability of 32 L / m ² · hr at the start of filtration, and the rate of reduction of the water permeability after a predetermined time filtration operation was 4%. In addition, the separation membrane structure of Embodiment 3 had a water permeability of 30 L / m ² · hr at the start of filtration, and the rate of decrease in the water permeability after a predetermined time filtration operation was 3%. On the other hand, the separation membrane structure of the comparative example had a water permeability of 30 L / m ² · hr at the start of filtration, and the rate of decrease in the water permeability after a predetermined time filtration operation was 6%.

  From the above results, in the separation membrane structure (separation membrane support) according to the embodiment of the present invention, the difference in separation treatment efficiency (filtration efficiency) by the separation membrane between the inner cell and the outer cell in the base material is small It has been found that the separation processing performance can be suppressed and the stable separation processing can be performed.

(Other embodiments)
It is needless to say that the present invention is not limited to the above-mentioned embodiment at all, and can be implemented in various modes without departing from the present invention.

  (1) In the above-described embodiment, the number of cell groups 51 in the cross section 314 of the base material 31 is three, but is not limited to this, and may be four or more. In the above-described embodiment, the number of cell groups 51 included in the cell group region 61 is two, but is not limited to this and may be three or more.

  (2) In the above embodiment, the cell group region 61 includes the innermost cell group (first cell group 51a) in the radial direction of the base material 31, but the invention is not limited to this. It may be configured not to include the radially innermost cell group 51 of the material 31.

  (3) In the embodiment described above, the outermost cell group 51 (third cell group 51 c) in the radial direction of the base material 31 is not included in the cell group region 61 in the cross section 314 of the base material 31. It is not limited to this. For example, the cell group region 61 may include all the cell groups 51 in the cross section 314 of the base material 31.

  (4) In the above-described embodiments (Embodiments 1, 3, and 4), in the cell group region 61, the cells 32 in the inner cell group 51 among the two cell groups 51 adjacent in the radial direction of the base material 31 D1 / D1 is 1.5 or more, where D1 is an average interval between the cells 32 in the outer cell group 51 and D2 is an average interval between the cells 32 in the outer cell group 51. For example, the embodiment is not limited thereto. 2, D2 / D1 may be less than 1.5.

  (5) In the above-described embodiment, in the cell group region 61, the average cross-sectional area of the cell 32 in the cell group 51 on the outer side in the radial direction of the base material 31 is the cell in the cell group 51 on the inner side in the radial direction of the base material 31. Although it is smaller than the average cross-sectional area of 32, it is not limited to such a configuration.

  (6) In the above-described embodiment, in the cell group region 61, the intervals between the cells 32 in the same cell group 51 are substantially equal, but the present invention is not limited to this, and cells in the same cell group 51 Each interval between 32 may be different.

  (7) In the above-described embodiment, in the cell group region 61, the cross-sectional areas of the cells 32 in the same cell group 51 are substantially the same, but the present invention is not limited to this. The cross-sectional areas of the cells 32 may be different.

  (8) In the above-described embodiment, one cell group 51 (third cell group 51 c) is arranged outside the cell group region 61 in the cross section 314 of the base material 31, but outside the cell group region 61. Two or more cell groups 51 may be arranged.

  (9) In the first to third embodiments described above, the cross-sectional shape of the base material 31 is a circular shape, and in the above-described fourth embodiment, the cross-sectional shape of the base material 31 is a hexagonal shape. Is not limited to this, and may be, for example, an elliptical shape, other polygonal shapes (triangular, quadrangular, pentagonal, etc.).

  (10) In the above-described embodiment, the cross-sectional shape of the cell 32 is a circular shape, but the cross-sectional shape of the cell 32 is not limited to this. It may be a pentagonal shape, a hexagonal shape, or the like.

  (11) In the above-described embodiment, the porous body made of alumina is used as the base material 31, but the material constituting the base material 31 is not limited to this. As the base material 31, for example, a ceramic such as mullite, titania, zirconia, or a metal material such as stainless steel or titanium may be used.

  (12) In the above-described embodiment, the porous membrane made of alumina is used as the separation membrane 22, but the material constituting the separation membrane 22 is not limited to this. The separation membrane 22 is, for example, a solid-liquid separation membrane (microfiltration membrane (MF), nanofiltration membrane (NF, etc.) composed of mullite, titania, zirconia, zeolite, palladium, carbon, amorphous silica, MOF (metal organic structure), etc. ), Ultrafiltration membrane (UF), reverse osmosis filtration membrane (RO)), a separation membrane capable of separation at the molecular level, and the like may be used.

  (13) In the above-described embodiment, the intermediate film serving as the base of the separation film 22 is provided between the inner wall surface 321 of the cell 32 of the base material 31 and the separation film 22, but such an intermediate film is not provided. It is good also as a structure.

DESCRIPTION OF SYMBOLS 1 ... Separation membrane structure module 11 ... Separation membrane structure 21 ... Separation membrane support 31 ... Base material 314 ... Cross section 32 ... Cell 40 ... Center (center of gravity)
400 ... center of gravity 41 ... virtual line 51 ... cell group 61 ... cell group region

Claims (8)

A separation membrane support for supporting a separation membrane for separating a fluid to be treated, comprising:
A porous columnar substrate;
And a plurality of cells formed axially penetrating the substrate.
In a cross section orthogonal to the axial direction of the base material, when a plurality of imaginary lines that are similar to the outer shape of the base material are drawn concentrically with the center of gravity of the base material as a base point, a plurality of the imaginary lines on each imaginary line Cells are arranged side by side,
When the plurality of cells arranged on the same virtual line are set as one cell group, a plurality of the cell groups are provided in the cross section, and of the plurality of cell groups, the base material A cell group region composed of two or more cell groups disposed adjacent to each other in the radial direction is provided;
In the cell group region, the average distance between the cells in the cell group outside the base in the radial direction is wider than the average distance between the cells in the cell group inside the base in the radial direction ,
Outermost cell group located outermost among the plurality of cell groups is not included in the cell group region,
An average interval between the cells in the outermost cell group is narrower than an average interval between the cells in the cell group included in the cell group region,
A separation membrane support characterized in that the fluid to be treated after separation processing which has passed through the separation membrane passes through the inside of the base material and flows out from the outer peripheral surface of the base material to the outside .   The separation membrane support according to claim 1, wherein the cell group region including the innermost cell group in the radial direction of the substrate is provided in the cross section of the substrate.   Among the two cell groups adjacent in the radial direction of the base material in the cell group region, D1 represents an average interval between the cells in the inner cell group, and an average interval between the cells in the outer cell group. The separation membrane support according to claim 1 or 2, wherein D2 / D1 is 1.5 or more, where D2 is D2.   In the cell group region, the average cross-sectional area of the cells in the cell group on the outer side in the radial direction of the base material is smaller than the average cross-sectional area of the cells in the cell group on the inner side in the radial direction of the base material. The separation membrane support according to any one of claims 1 to 3, wherein:   5. The separation membrane support according to claim 1, wherein in the cell group region, the intervals between the cells in the same cell group are substantially equal.   The separation membrane support according to any one of claims 1 to 5, wherein in the cell group region, the cross-sectional areas of the cells in the same cell group are substantially the same. The separation membrane support according to any one of claims 1 to 6,
What is claimed is: 1. A separation membrane structure comprising: a separation membrane provided on an inner wall surface of the cell of the separation membrane support. The separation membrane structure according to claim 7,
A separation membrane structure module comprising: a housing for accommodating the separation membrane structure therein.