JPH1190119A - Filter vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the local clogging of a filter membrane and to maintain the filterability for a long period by detachably providing a cylindrical structure shorter than a cartridge filter on the pedestal of the cartridge filter with the bottom liquid-tightly fixed in a filter vessel in the downstream hollow part of the filter, passing the liq. passed through a filter membrane between the outer periphery and inner periphery of the plural structures and recovering the liq. SOLUTION: The upstream side of a filter membrane 6 is in contact with a liq. to be filtered, and the liq. passed through the opening 51 for the liq. in an outer peripheral guard 5 is filtered into the downstream side of the membrane 6 from the upstream side and introduced into a space 32 formed by the outer periphery of a cylindrical structure 31 and the inner periphery of a cartridge filter through the liq. collecting opening 52 of a core 7. The filtrate is sent upward in the space 32, passed through the filtrate passages 33 and 34 and recovered through the filtrate opening 12 provided in a pedestal 13. The filtrate introduced into the space 32 is forced up to the height of the passage 33, the liq. positioned at the relatively low part is put under the higher pressure than the liq. positioned at the upper part, and the fluxes of the liq. passing through the membrane 6 are almost equalized regardless of the positional relation. Consequently, the service life of the membrane 6 is prolonged, and the filtration cost is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtration container having a tubular cartridge filter used for filtering liquid.

[0002]

2. Description of the Related Art Conventionally, various types of filtration modules and filtration elements have been known in order to increase the filtration flow rate and facilitate the handling of the filtration membrane during filtration by the filtration membrane. One of the typical filtration elements is a pleated cartridge filter which is so-called pleated in which a filtration membrane is folded and housed in a cartridge having a fixed capacity. In this pleated cartridge filter, when a filtration membrane having a small bending strength is used, the filtration membrane breaks during pleating and loses its function as a filtration membrane. To remedy such inconvenience, reinforce the filtration membrane,
In addition, in order to serve as a spacer for preventing the filtration membrane surfaces from contacting each other, the both surfaces of the filtration membrane are made of a nonwoven fabric, a woven fabric, or a polymer or metal net (for example, JP-A-60-58208). Conventionally, pleating of the obtained sandwich-type filtration membrane sandwiched between liquid-permeable sheets such as the above has been performed. Also,
Disc-shaped cartridge filters, such as those described in Japanese Patent No. 28654 and Japanese Utility Model Publication No. Sho 63-37052, are also conventionally known.

[0003] The cylindrical cartridge filter as described above is generally mounted in a sealable container and used for filtration. Conventionally, the cylindrical cartridge filter as described above has been used. Built-in filtration vessels are known. That is, one or a plurality of cylindrical cartridge filters and a pedestal for the cartridge filter are provided in a container having a primary filtrate inlet and a secondary filtrate outlet, and the bottom of the cartridge filter is mounted on the pedestal. Liquid-tightly fixed, and the secondary hollow portion of the cartridge filter is connected to a filtrate outlet of the container through a filtrate port provided at the bottom of the cartridge filter and a filtrate port provided at the base. Filtration vessels that are in communication are known. FIG. 1 is a conceptual diagram illustrating a cross section of an example of such a filtration container.

In FIG. 1, 1 is a shell, 14 is a lid,
15 is a base. Reference numeral 2 denotes an inlet for the filtrate to be filtered on the primary side provided in the shell 1, reference numeral 3 denotes an outlet for the filtrate on the secondary side provided in the shell 1, and reference numeral 4 denotes an air vent for evacuating the air in the container as necessary. Mouth. The term “primary side or secondary side” as used herein generally refers to the side on which the liquid to be filtered, that is, the side where the liquid before filtration exists, is referred to as the primary side in the filtration operation, and the filtrate, ie, the side where the liquid after filtration exists. Is called the secondary side, and it has the same meaning.

[0005] In the filtration container shown in Fig. 1, a plurality of cylindrical cartridge filters are installed in a vertical direction with respect to the ground. This cartridge filter is a so-called pleated type that has a large number of liquid ports to be filtered, a cylindrical outer peripheral guard 5 for protecting a filtration membrane, and a pleated shape that is folded in a state sandwiched by liquid-permeable sheets provided on both surfaces. A cylindrical filtration membrane 6, a cylindrical core 7 having a number of liquid collecting ports, a top end plate 8, and a bottom end plate 10. The top end of the cylindrical filtration membrane 6 is formed on the top end plate 8. The lower end of the filtration membrane 6 is attached to the bottom end plate 10 in a liquid-tight manner, and has a secondary-side hollow portion 11. The cartridge filter is liquid-tightly fixed to a base 13 provided with a filtrate port 12 in a base 15. In this filtration container, the primary side and the secondary side of the cylindrical filtration membrane 6 are isolated by the above structure.

In the filtration container shown in FIG. 1, the liquid to be filtered supplied to the primary side liquid to be filtered inlet 2 is supplied to the cylindrical outer guard 5.
, And the filtrate that has passed through the pleated tubular filtration membrane 6 and is filtered by the pleated tubular filtration membrane 6 passes through the collection port of the tubular core 7 and the secondary hollow portion 11. , And is discharged from a secondary-side filtrate outlet 3 provided on a base 15 through a filtrate port 12 provided on a base 13.

FIG. 2 is a developed view showing the entire structure of an example of a conventionally known pleated cartridge filter. In the cartridge filter shown in FIG. 2, the filtration membrane 21 is folded while being sandwiched by two liquid-permeable sheets 22 and 23, and wound around a core 25 having many liquid collection ports 24. On the outside, there is an outer peripheral guard 27 having a liquid port 26 to be filtered to protect the filtration membrane. The top end of the cylinder consisting of the above elements is
The lower ends of the cylinders are each sealed with a filtration membrane by a bottom end plate 29. Bottom end plate 29
Is in contact with a seal portion (not shown) of a pedestal of a cartridge filter provided in the filter container via a gasket (not shown). The filtrate after filtration is collected from the liquid collecting port 24 of the core 25 and discharged from a secondary side filtrate outlet (not shown) provided in the container.

In general, if filtration is performed for a certain period of time, the filtration membrane of the cartridge filter becomes unusable because it is clogged with components and foreign substances in the liquid to be filtered. The degree of clogging of the filtration membrane can be estimated by measuring the filtration pressure difference applied to the filtration membrane. That is, it can be known from the difference between the pressure applied to the primary side and the pressure applied to the secondary side of the filtration membrane. The filtration differential pressure applied to the clogged cartridge filter may be as large as 4 kg / cm ² G or more. In such a case, depending on the performance of the liquid sending pump, the liquid to be filtered cannot be sent,
The filter membrane may be broken or the cartridge filter itself may be broken. As described above, the time from when the cartridge filter is used for filtration until the filtration differential pressure rises and the filter cannot withstand use or the accumulated filtration amount is sometimes referred to as the filtration life.

[0009]

In the above-mentioned conventional filter container having a built-in cylindrical cartridge filter, the liquid to be filtered is filtered through the shortest distance in the container according to the gravity and filtration resistance applied to the filter. 2 from the primary side of the membrane
Go to the next side. At the time of filtration, particularly at the initial stage, there is a case where almost no filtration pressure difference is applied to the filtration membrane. The cartridge filter is placed perpendicular to the ground,
Therefore, in the steady state, the liquid to be filtered has a corresponding liquid depth, and the flux of the liquid passing through the filtration membrane can be distributed according to the gravity applied to the liquid to be filtered. That is, in the upper part and the lower part of the cartridge filter, the gravity applied to the liquid to be filtered is larger in the lower part, and the flux of the liquid passing through the filtration membrane is larger. Although the flux of the liquid passing through the filtration membrane itself changes depending on the viscosity of the liquid to be filtered and the resistance of the filtration membrane itself to the liquid to be filtered, as described above, the flux applied to the liquid to be filtered is changed. The problem is that the distribution of the liquid flux passing through the filtration membrane is correspondingly distributed. In other words, if the lower part of the cartridge filter has a higher flux of the liquid passing through the filtration membrane than the upper part, the filtration membrane will be clogged by components and foreign substances in the liquid to be filtered from the lower part of the cartridge filter, and the filtration difference from the lower part. Pressure increases. Generally, when the flux of the liquid passing through the filtration membrane in the filtration membrane is large, the accumulated filtration amount tends to be smaller than when the flux is small. In short, if the cartridge filter is clogged in order from the bottom, there is a problem that the filtration life is shorter than in the case where the cartridge filter is uniformly clogged.

From the viewpoint of extending the filtration life of the filtration membrane of the cartridge filter, the present inventors have aimed to make the cartridge filter horizontal with respect to the ground in order to make the flux of the liquid passing through the filtration membrane uniform. And suspend the cartridge filter from the top of the container,
An attempt was made to make the liquid to be filtered enter from the lower part of the container and recover the filtrate from the upper part. Both methods are methods for reducing the influence of gravity applied to the liquid to be filtered on the flux of the liquid passing through the membrane in each cartridge filter. However, in the former case, since the clogging occurs sequentially from the cartridge filter existing in the lower part of the container, the life of the entire filter in the container cannot be expected to be prolonged. In the latter case, a large amount of the liquid to be filtrated remains inside the container, so that the structure was inefficient from the viewpoint of using the filtrate. Further, the present inventors, if the flux of the liquid to be filtered is reduced, since the filtration life of the filtration membrane is extended as compared with the case where the flux is large, the flux is reduced, and the amount of the filtrate is not reduced. As a method, a method of increasing the number of cartridge filters existing in the container was considered, but in this case, capital investment becomes large.

An object of the present invention is to firstly make it possible to make the flux of a liquid passing through a filter membrane of a cartridge filter uniform, so that the filter membrane becomes locally clogged, especially in the direction of gravity. Clogging near the lower part of the filter is prevented, the life of the filtration membrane is extended, and the cartridge filter itself is provided with a means for maintaining the filtration performance for a long period of time. Is to provide economically in a way.

[0012]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, first, the present invention relates to a cartridge filter itself having a unique structure having a plurality of cylindrical structures. The invention, that is, a cartridge filter having a core and a filtration membrane around the core, has a tubular structure arranged on a plurality of substantially concentric circles inside the core, and one end of the tubular structure is one of upper and lower The end plate is alternately separated and the other end is liquid-tight, and the liquid that has passed through the filtration membrane is recovered from the outlet through a space formed by the outer and inner peripheries of the plurality of structures. An invention relating to a cartridge filter was made, and a patent application was filed (Japanese Patent Application No. Hei 9-186749).
issue). The cartridge filter according to the preceding invention is
Although it achieves the first objective accordingly,
Since the cartridge has a plurality of tubular structures and the structure is complicated, there is a problem that the manufacturing is complicated and costly. In the cartridge filter,
Since the liquid that has passed through the filtration membrane bends and flows a plurality of times using a plurality of spaces formed by the outer and inner peripheries of the plurality of tubular structures as flow paths, there is also a problem that filtration resistance increases.

The present inventors have further achieved the above-mentioned second object, and as a result of intensive studies to solve the problems of the cartridge filter according to the above-mentioned invention,
The first object can be easily achieved by the simple and economical method of attaching the cylindrical structure to the cartridge filter pedestal in the container so as to be inserted into the secondary hollow portion of the cartridge filter, and The inventors have found that the problems of the cartridge filter according to the present invention can be easily solved and completed the present invention. That is, the present invention has one or a plurality of cylindrical cartridge filters and a pedestal for the cartridge filters in a filtration container provided with a primary filtrate inlet and a secondary filtrate outlet. The bottom of the cartridge filter is fixed to the pedestal in a liquid-tight manner, and the secondary hollow portion of the cartridge filter is connected to the base through a filtrate port provided on the bottom of the cartridge filter and a filtrate port provided on the pedestal. In the filtration container communicated with the filtrate outlet, a cylindrical structure having a shorter length than the cartridge filter capable of forming a filtrate passage between the base and the inner wall of the top end plate of the cartridge filter is detachable. The present invention relates to a filtration container characterized by being provided.

According to the present invention, the first cartridge filter and the filtration container which have been conventionally used are used, and the first cylindrical structure of the cartridge filter of the filtration container is attached by a simple and economical method. The purpose can be easily achieved. Further, in the filtration container according to the present invention, since the flow path of the filtrate passing through the filtration membrane does not bend a plurality of times as in the case of the cartridge filter according to the previous invention, the cartridge according to the previous invention Low filtration resistance compared to filters.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 is a conceptual diagram showing a cross section of an example of an embodiment of a filtration container according to the present invention. In FIG. 3, reference numerals 1 to 15 are the same as those in FIG. 31 is a cylindrical structure. This tubular structure 31
The lower end is on the base 13, and the filtrate port 1 provided on the base 13 is
2 so as to be connected in a liquid-tight manner. And
A space 32 comprising the outer periphery of the tubular structure 31 and the inner periphery of the tubular cartridge filter (the inner periphery of the core 7) is formed, and the upper end of the tubular structure 31 and the inner wall of the top end plate 8 of the cartridge filter are formed. Filtrate passage 33 between
Is formed. In the filtration container of FIG. 3, the filtrate filtered by the tubular filtration membrane 6 passes through the collection port of the tubular core 7,
The liquid flows into a space 32 formed by the outer periphery of the tubular structure 31 and the inner periphery of the cartridge filter, rises in the space 32, and contacts the upper end of the tubular structure 31 and the inner wall of the top end plate 8 of the cartridge filter. Filtrate passage 3 between
3, the space (the hollow portion of the cylindrical structure 31) 34 surrounded by the inner periphery of the cylindrical structure 31 is lowered, and the filtrate of the base 15 is filtered through the filtrate port 12 provided in the pedestal 13. Liquid outlet 3
Is discharged from

FIG. 4 and FIG. 5 are schematic diagrams showing the difference between the flux of the liquid passing through the filtration membrane in the case of the filtration container according to the present invention and the case of the conventional filtration container. That is, FIG. 4 is a schematic diagram in the case of the conventional filtration container as shown in FIG. 4, 5 to 10 are the same as those in FIG. That is, 5 is the outer guard, 6
Is a filtration membrane, 7 is a core, 8 is a top end plate, and 10 is a bottom end plate. Reference numeral 41 denotes a liquid to be filtered of the outer peripheral guard 5, and reference numeral 42 denotes a liquid collection port of the core 7. In a general filtration step, the primary side of the filtration membrane 6 is in contact with the liquid to be filtered in the container. The liquid that has passed through the liquid to be filtered 41 of the outer peripheral guard 5 is filtered from the primary side of the filtration membrane 6 to the secondary side, and is recovered through the liquid collecting port 42 of the core 7. At this time, since the liquid to be filtered is applied with its own weight, the liquid located relatively below receives a greater pressure than the liquid located above, so that the filtration flux increases. In this way, the flux of the liquid passing through the filtration membrane is not uniform. That is, the above fluxes of (a1), (b1), and (c1) indicating the flow of the liquid near the upper end, near the center, and near the lower end are (a1) <(b1) <(c1). .

FIG. 5 is a schematic view of the case of the filtration container according to the present invention as shown in FIG. In FIG.
And 31 to 34 are the same as those in FIG. That is, 5 is an outer peripheral guard, 6 is a filtration membrane, 7 is a core, 8 is a top end plate, 10 is a bottom end plate, 12 is a filtrate port, 13 is a pedestal, 31 is a cylindrical structure, and 32 is a cylindrical structure. 33 is a space formed by the outer periphery of the structure 31 and the inner periphery of the cartridge filter, 33 is a filtrate passage between the upper end of the cylindrical structure 31 and the inner wall of the top end plate 8 of the cartridge filter, and 34 is the cylindrical structure. 31 is a space surrounded by the inner periphery of the base. Reference numeral 51 denotes a liquid port to be filtered of the outer peripheral guard 5,
52 is a liquid collecting port of the core 7. In a general filtration step, the primary side of the filtration membrane 6 is in contact with the liquid to be filtered in the container. The liquid that has passed through the liquid to be filtered 51 of the outer peripheral guard 5 is filtered from the primary side of the filtration membrane 6 to the secondary side, and is collected by the liquid collecting port 5 of the core 7.
2 and flows into a space 32 formed by the outer periphery of the tubular structure 31 and the inner periphery of the cartridge filter (the inner periphery of the core 7). The space 34 surrounded by the inner periphery of the tubular structure 31 is lowered via the filtrate passage 33 between the cartridge filter and the inner wall of the top end plate 8, and passed through the filtrate port 12 provided on the pedestal 13. And collected. At this time, the liquid to be filtered has its own weight, as in the case of the conventional filtration container shown in FIG. 4, so that the liquid located at the lower part has a higher pressure than the liquid located at the upper part. It takes. On the other hand, in the filtration container according to the present invention, the filtrate flowing into the space 32 is:
It is pushed up to the height of the filtrate passage 33. In other words,
Also in the filtrate on the secondary side, depending on the height of the filtrate passage 33, a relatively higher pressure is applied to the liquid positioned relatively lower than the liquid positioned above. Therefore, the flux of the liquid passing through the filtration membrane is substantially the same regardless of the positional relationship between the upper and lower liquids. That is, (a2), (b2), and (c) indicate the flow of the liquid near the upper end, near the center, and near the lower end.
The flux of 2) is (a2) ≒ (b2) ≒ (c2).

The cross-section of the tubular structure used in the present invention is preferably point-symmetrical, more preferably circular. Such a cross-sectional shape helps uniform the flux in the circumferential direction of the filtration membrane. Further, in the present invention, the space surrounded by the inner periphery of the tubular structure (the inner periphery of the cylindrical structure) and the inner periphery of the cylindrical structure (the inner periphery of the core) is defined by the inner periphery of the tubular structure. The ratio of the cross-sectional area of the hollow portion of the tubular structure) is 90 to 110%.
Is preferably within the range. If this ratio is less than 90%, the flux of the liquid entering the space surrounded by the inner periphery of the tubular structure is limited, which may cause an increase in filtration resistance. On the other hand, when it exceeds 110%, the object of the present invention of making the flux of the liquid passing through the filtration membrane uniform may not be sufficiently achieved.

The cylindrical structure used in the present invention has a cross-sectional area of a filtrate passage between an upper end of the cylindrical structure and an inner wall of a top end plate of a cartridge filter.
The smaller the cross-sectional area of the space formed by the outer periphery of the tubular structure and the inner periphery of the tubular cartridge filter, or the smaller the cross-sectional area of the space surrounded by the inner periphery of the tubular structure, the smaller is 80 to 1
The length (height) is preferably in the range of 20%. When the above ratio is less than 80%, when the filtrate passes through the passage, the whole filtration is controlled, which may cause an increase in filtration resistance at the beginning of the filtration. Also, 120
%, The object of the present invention of making the flux of the liquid passing through the filtration membrane uniform may not be sufficiently achieved.

The material of the tubular structure used in the present invention can be appropriately selected as needed. As this material, metal, ceramics, glass, or polyethylene, polypropylene,
Polymer substances such as polyester and polysulfone can be used as appropriate. It is preferable to use the same material as each member constituting the filtration container, that is, each member of the shell, the pedestal, the cartridge filter (excluding the filtration membrane and the liquid-permeable sheet) and the like.

The cylindrical structure used in the present invention may be fixed to the pedestal by various well-known fixing means according to the material of the cylindrical structure and the pedestal, or as necessary. You can choose to do it. For example, it can be performed by bolting, bonding with an adhesive, welding, or the like. In addition, if necessary, it may be fixed detachably or fixed so as not to be detachable. However, this fixation needs to be liquid-tight.

In practicing the present invention, various shells, cylindrical cartridge filters, and pedestals of the cartridge filters for constituting the filtration container may be any of those conventionally known or used, if necessary. Can be appropriately selected and used. The filtration container of the present invention can be constituted by using the above-mentioned structure and the above-described tubular structure and having the above-described structure. As the cylindrical cartridge filter, various types such as a pleated cartridge filter and a disk-stacked cartridge filter can be appropriately selected and used as needed, and a pleated cartridge filter is preferably used. Also, as the filtration membrane incorporated in the cartridge filter, if necessary, various average pore sizes and various materials can be appropriately selected and used, and the average pore size is 0.05 to 10 μm. A material of a polysulfone type is preferably used. A polysulfone filtration membrane has a pore size on both surfaces of the membrane that is two times smaller than the pore size of the smallest pore size layer inside the membrane.
Although the anisotropic structure is twice or more, the effect of the present invention is particularly remarkable when a filtration membrane having such an anisotropic structure is used. As the pedestal of the cartridge filter, a pedestal type provided with a filtrate port as shown in FIGS. 1, 3 and FIG. 6 described later is preferably used. Furthermore, the number of cartridge filters to be incorporated in the container is appropriately selected according to the amount of the liquid to be filtered, the size of the container, the size of the cartridge filter, and the like.

The filtration container of the present invention has various embodiments without departing from the technical concept of the present invention. For example, in the embodiment shown in FIG. 3, the inlet of the filtrate on the primary side is provided at the lower part of the container. Needless to say, it can be provided at Further, in the container, a baffle plate for changing the direction of the flow of the filtrate to be filtered from the inlet or dispersing the flow is required on the front surface at a predetermined distance from the inlet of the filtrate on the primary side. It can also be provided accordingly.

The liquid to be filtered applied to the filtration container of the present invention is:
Those having a viscosity in the range of 0.5 to 100 cP are suitable,
Preferably it is 10 cP or less. In the case of a viscosity exceeding 100 cP, the filtration resistance of the liquid to be filtered to the filtration membrane becomes large, and the influence on the gravity flux distribution in the vertical direction of the cartridge filter during filtration becomes small, and the effect of the present invention is small. Become. Further, the application of the filtration container of the present invention is not particularly limited, removal of dust and the like in ultrapure water, liquid medicine, bacteria and viruses from foods and the like, and other suspended impurities. Removal is mentioned as an example.

[0025]

EXAMPLES The present invention will be described in detail below with reference to examples and comparative examples, but the present invention is not limited to these examples. (Preparation of filtration membrane made of polysulfone) A filtration membrane made of polysulfone was formed. That is, 15 parts of polysulfone (P-3500 manufactured by Amoco), 70 parts of N-methyl-2-pyrrolidone, 15 parts of polyvinylpyrrolidone, 2 parts of lithium chloride, and 1.3 parts of water are uniformly dissolved to prepare a stock solution for film formation. I do. This was cast to a product thickness of 180 μm, and air at a temperature of 25 ° C., a relative humidity of 50% and a wind speed of 1.0 m / sec was applied to the surface of the liquid film cast for 8 seconds, and water at 25 ° C. was immediately poured. It was immersed in a filled coagulation bath to obtain a microporous membrane. The bubble point of this film due to water was 150 kPa.

Example 1 A nonwoven fabric sheet having a basis weight of 50 g / m ² was produced using polypropylene having a fineness of 1.5 d. The above-mentioned polysulfone filtration membrane was sandwiched between the two nonwoven fabrics, pleated to a pleat width of 10 mm, folds of 145 ridges were taken, rounded into a cylinder, and the joint was sealed with an epoxy adhesive. Both ends of this cylinder were cut off at 5 mm intervals, and the cut surfaces were sealed with an epoxy adhesive.
A filtration filter having a cylindrical sandwich structure of 0 mm was produced. This cylindrical filtration membrane was packed in an outer periphery guard, and a core and upper and lower end plates were attached.
A cartridge filter having a length of 800 mm and a length of 800 mm was prepared. This cartridge filter and outer diameter 27m
A filtration container was prepared using a polypropylene cylindrical structure having a length of 750 mm, an inner diameter of 22 mm and an inner diameter of 22 mm. FIG. 6 conceptually shows the structure of this filtration container. In FIG.
13 and 31 to 34 are the same as those in FIG. That is, 1 is a shell, 2 is a filtrate inlet on the primary side, 3 is a filtrate outlet on the secondary side, 4 is an air vent, 5 is a cylindrical outer peripheral guard, 6
Is a cylindrical filtration membrane (a Santoitch structure sandwiched between nonwoven fabric sheets), 7 is a core, 8 is a top end plate, 10 is a bottom end plate, 12 is a filtrate port, 13 is a pedestal, 31 is a cylindrical structure, and 32 is a cylindrical structure. A space, 33 is a filtrate passage, and 34 is a space (the hollow portion of the cylindrical structure). The shell 1 has a cylindrical shape with an inner diameter of 95 mm and a height of 950 mm. The cylindrical structure 31 was fixed to the pedestal 13 in a liquid-tight manner via a silicon rubber rolling. A valve (not shown) is attached to the upper part of the air vent 4. Using the above-mentioned filtration container, beer 5
The beer was supplied at a rate of 00 L / h, and the beer was filtered. It took 36 days for the filtration pressure difference to reach 1.0 kg / cm ² G.

Comparative Example 1 Same as Example 1 except that no cylindrical structure was provided.
Beer under the same conditions as in Example 1 using the same filtration container
Was filtered. Filtration differential pressure is 1.0kg / cm ^TwoG
It took 30 days to complete.

[0028]

According to the present invention, the flux of the liquid passing through the filtration membrane can be made uniform by a simple and economical method, and the filtration life of the cartridge filter can be increased easily and inexpensively. it can. As a result, the cost of the filtration step using the cartridge filter can be reduced.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing the structure of a conventional filtration container having a built-in cartridge filter.

FIG. 2 is a development view showing the structure of a conventional pleated cartridge filter.

FIG. 3 is a conceptual diagram showing a structure of one embodiment of a filtration container of the present invention.

FIG. 4 is a view schematically showing the flow of a liquid before and after filtration in a conventional filtration container having a built-in cartridge filter. The arrows in the figure indicate the directions in which the liquid flows before and after filtration.

FIG. 5 is a diagram schematically showing the flow of a liquid before and after filtration in an embodiment of the filtration container of the present invention. The arrow in the figure is
Shows the direction of flow of the liquid before and after filtration.

FIG. 6 is a conceptual diagram showing the structure of the filtration container of the present invention used in the examples.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shell 2 Primary filtrate inlet 3 Secondary filtrate outlet 4 Air vent 5 Cylindrical outer periphery guard 6 Cylindrical filtration membrane 7 Core 8 Top end plate 10 Bottom end plate 11 Secondary hollow part 12 Filtrate port Reference Signs List 13 pedestal 14 lid 15 base 21 filtration membrane 22 liquid-permeable sheet 23 liquid-permeable sheet 24 liquid collecting port 25 core 26 filtered liquid port 27 outer peripheral guard 28 top end plate 29 bottom end plate 31 cylindrical structure 32 space 33 filtration Liquid passage 34 Space (hollow portion of cylindrical structure) 41 Liquid port to be filtered 42 Liquid collecting port 51 Liquid port to be filtered 52 Liquid collecting port

Claims (1)

[Claims] 1. A cartridge having one or a plurality of cylindrical cartridge filters and a pedestal for the cartridge filters in a filtration vessel provided with an inlet for a filtrate to be filtered on a primary side and an outlet for a filtrate on a secondary side. A bottom portion is fixed to the pedestal in a liquid-tight manner, and a secondary hollow portion of the cartridge filter is provided with a filtrate port provided on the bottom portion of the cartridge filter and a filtrate port provided on the pedestal. In the filtration container communicating with the liquid outlet, a cylindrical structure having a shorter length than the cartridge filter capable of forming a filtrate passage between the pedestal and the inner wall of the top end plate of the cartridge filter is detachably provided. A filtration container characterized by being made.