JP2005021766A - Cartridge filter for removing ion and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently remove a harmful ion by distributing an ion removing powder so as to sufficiently exhibit function in response to a flow of a liquid to be treated and to realize manufacturing even at a large number of kinds and less numbers of lots without reducing manufacturing efficiency of a cartridge filter having different ions to be removed. <P>SOLUTION: The cartridge filter is provided with a pleat type filter medium having a filter material circumferentially attached by clamping and folding in pleat between at least two sheets of support materials on an outer periphery of a cylindrical core having a large number of holes. The ion removing powder fixed to the pleat type filter medium is deposited by suction force from a filter suction direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【００４４】
【表２】

【００４５】
表１、２から明らかなように、本発明品は、比較例に比べて有害イオンの除去効率が約２０〜３０％向上し優れていることが判明した。
【００４６】
【発明の効果】
請求項１に記載に発明によれば、イオン捕捉粉体がプリーツ型濾過体を通過する被処理液の流量に対応するように分布するから、従来と同一の付着量でも有害イオンを効率的に除去することができ、除去効率を向上することができる。
【００４７】
請求項２に記載の発明によれば、圧力損失の増大と有害イオンの除去効率の低下を防止することができる。
【００４８】
請求項３に記載の発明によれば、被処理液が濾過材を略均等に通過して、イオン除去粉体と十分に接触し、有害イオンの除去効率がより一層向上することができ、また濾過材を厚くしてもイオン捕捉粉体を濾過材の密度勾配に応じて付着し、有害イオンの除去効率をより一層向上することができる。
【００４９】
請求項４に記載の発明によれば、イオン捕捉粉体を被処理液の流れに対応して固定したイオン除去用カートリッジフィルタを簡単に製造することができ、またユーザーの様々な要望に対応する製品を多品種少ロットでも生産効率を低下することなく製造することができる。
【図面の簡単な説明】
【図１】一実施の形態を示す一部破断斜視図である。
【図２】イオン交換樹脂粉体の付着状態を示す概略拡大模式図である。
【図３】（ａ）はイオン交換樹脂粉体の付着工程に用いる吸引装置の概略図、（ｂ）はイオン交換樹脂粉体の固着工程に用いる吸引装置の概略図である。
【図４】従来のカートリッジフィルタの一部破断斜視図である。
【図５】基材シートの断面図である。
【図６】従来技術によるイオン交換樹脂の付着状態を示す概略模式図である。
【符号の説明】
１・・・・・コア
２・・・・・プリーツ型濾過体
２ａ・・・・濾過材
２ｂ・・・・内面サポート材
２ｃ・・・・外面サポート材
３・・・・・外周カバー
４・・・・・上エンドプレート
５・・・・・下エンドプレート
６・・・・・流出口
７・・・・・イオン交換樹脂粉体
Ａ，Ｂ・・・液槽
Ｃ・・・・・回収槽
Ｆ・・・・・カートリッジフィルタ
Ｐ・・・・・ポンプ
Ｓ１・・・・第一処理槽
Ｓ２・・・・第二処理槽
Ｔ・・・・・管
Ｕ・・・・・攪拌機[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cartridge filter including a pleated filter used for microfiltration of various liquids, and more particularly to an ion removal cartridge filter that captures and removes harmful ions contained in a liquid and a method for manufacturing the same.
[0002]
[Prior art]
In general, as shown in FIG. 4, the cartridge filter includes a cylindrical core 10 having a large number of holes, a pleated filter body 11 disposed on the outer periphery of the core, and a porous outer cover 12 storing these. The upper end plate 13 and the lower end plate 14 are liquid-tightly sealed at the upper and lower ends of the outer peripheral cover 12 (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-99307 (page 2, column 1, column 2)
[0004]
The cartridge filter for removing ions is manufactured by the following method. That is, a base sheet in which an inner surface support material 11b and an outer surface support material 11c are superposed after an ion exchange resin is fixed to the filter material 11a made of a melt blown nonwoven fabric, a spunbond nonwoven fabric or the like by an adhesive treatment or a coating treatment. (FIG. 5). Next, the base sheet is subjected to pleating with a certain pleat width, and the base sheet is cut into a dimension corresponding to the outer diameter of the core and arranged on the outer periphery of the core so as to be in the radial direction of the pleated core. Then, the seams are adhered in a liquid-tight manner to form the pleated filter body 11 and then stored in the outer peripheral cover 12. Then, the upper and lower end plates 13 and 14 are liquid-tightly sealed at both ends of the outer peripheral cover 12 to manufacture an ion removing cartridge filter.
[0005]
In the cartridge filter according to the prior art, as shown in FIG. 6, ion exchange resin powders 15 having different particle diameters are mixed in the filter body 11a and over both surfaces. However, the liquid processed by the cartridge filter (hereinafter referred to as the liquid to be processed) does not flow evenly from the inflow side to the outflow side of the pleated filter body, and is concentrated most in the valley portion of the pleat located on the core side. Flowing.
Therefore, the ion exchange resin powder in the peak portion of the pleat does not sufficiently perform its function, and there is a problem that the removal efficiency of harmful ions is not improved in proportion to the amount of ion exchange resin powder attached.
[0006]
In addition, when the conventional method is used, since the pleated filter body is molded with a base sheet pre-coated with ion exchange resin powder, a large variety of cartridge filters that manufacture a large number of cartridge filters that remove the same harmful ions are used. Suitable for lot production.
However, this type of cartridge filter is widely used in various industrial fields, and harmful ions to be removed differ depending on the liquid to be treated.
Therefore, there is a problem that the production efficiency becomes very poor because it is not suitable for the production of a large variety of small lots for producing cartridge filters having different harmful ions to be removed.
[0007]
[Problems to be solved by the invention]
Therefore, the present invention has been made to solve the problems of the prior art, and the ion-removed powder is distributed so as to fully function in accordance with the flow of the liquid to be treated, thereby eliminating harmful ions efficiently. It is an object of the present invention to make it possible to remove a cartridge filter with different harmful ions to be removed, and to produce a large variety of small lots without reducing the production efficiency.
[0008]
[Means for Solving the Problems]
A cartridge filter for ion removal according to a first aspect of the present invention is a pleated filter body in which a filter medium is sandwiched between at least two support members and folded around the outer periphery of a cylindrical core having a large number of holes. The ion capture powder fixed to the pleated filter is attached by a suction force from the filter suction direction (Claim 1).
[0009]
Here, the ion-trapping powder means a powder having a function of trapping and removing metal ions in the liquid to be treated. Specifically, an ion-exchange resin, activated carbon, zeolite, photocatalyst, chelate powder, charging Powders of substances, organic adsorbents, inorganic adsorbents, etc.
[0010]
According to this means, since the ion trapping powder is distributed so as to correspond to the flow rate of the liquid to be processed passing through the pleated filter, its function is sufficiently exhibited.
[0011]
In the present invention, the pore size distribution of the filter medium is preferably a configuration in the range of 0.5 μm to 50 μm (Claim 2). This is because if it is less than 0.5 μm, the initial pressure loss due to the fixation of the ion-trapping powder becomes too large to be practical, and if it exceeds 50 μm, the liquid to be treated flows easily without contacting the ion-exchange resin powder. This is because the removal efficiency of metal ions tends to decrease, and the more preferable range of pore size distribution is 2 μm to 15 μm. The pore size distribution is a numerical value measured by a measuring device based on the bubble point method (JISK3832) (for example, product name Perm-Porometer, hereinafter referred to as palm porometer).
[0012]
Further, the pore size distribution of the filter medium is in the range of 0.5 μm to 50 μm, and the density gradient becomes smaller from the inflow side to the outflow side, and the minimum particle diameter of the ion trapping powder is larger than the minimum pore diameter of the filter medium. A certain configuration (Claim 3) is preferable. In this way, the ion-trapping powder having a relatively large particle size and a small particle size is fixed in accordance with the pore size distribution from the inflow side to the outflow side of the filter body.
Therefore, the liquid to be treated passes through the filter medium substantially evenly and comes into sufficient contact with the ion-removed powder, and the removal efficiency of harmful ions is further improved. Further, even when the filter medium is relatively thick, the ion trapping powder is fixedly aligned in the thickness direction from large to small.
[0013]
Next, a method for manufacturing a cartridge filter for removing ions according to a second aspect of the present invention includes a method in which a filter medium is sandwiched between at least two support members on the outer periphery of a cylindrical core having a large number of holes and the periphery is folded. The cartridge filter equipped with the pleated filter body is immersed in the liquid tank containing the processing solution, the processing solution is sucked from the filter suction direction, and the ion trapping powder adheres to the pleated filter body. And a step of sequentially or simultaneously performing the fixing (claim 4).
[0014]
In this case, when the ion trapping powder is adhered and fixed at the same time, there are advantages that the number of processes is reduced and the production efficiency is improved. However, when the treatment solution contains a binder resin, the viscosity increases, and the ion trapping powder tends to be distributed in a predetermined amount in the crest and trough portions of the pleated filter body and hardly adhere.
Therefore, in consideration of the distribution state of the ion trapping powder and the adjustment of the amount of adhesion, it is more preferable to sequentially perform the step of attaching the ion trapping powder to the filter body and the fixing step.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the invention will be described with reference to the drawings.
[0016]
In FIG. 1, a cartridge filter F includes a cylindrical core 1 having a large number of holes, a pleated filter body 2 disposed on the outer periphery of the core 1, a porous outer cover 3 storing these, and an outer cover. 3 is provided with an upper end plate 4 and a lower end plate 5 which are sealed in a liquid-tight manner at the upper and lower ends. In addition, 6 is an outflow port in the figure.
[0017]
In the pleated filter body 2, the inner surface support material 2b (outflow side) and the outer surface support material 2c (inflow side) are overlapped on both sides of the filter medium 2a and cut into a predetermined dimension, thereby pleating with a pleat width of the predetermined dimension. The necessary number of ridges is cut in accordance with the outer diameter of the core 1 and the pleats are arranged in the outer periphery of the core 1 in the radial direction, and the mating portions are adhered in a liquid-tight manner.
[0018]
In addition, as shown in FIG. 2, the pleated filter body 2 has ion exchange resin powder 7 in a relatively dense state inside and on the surface of the pleat valley located on the outflow side b, and also on the inflow side a. It is fixed in a relatively rough state on the inside and on the surface of the crest portion located at.
[0019]
As the filter medium 2a, a melt blown nonwoven fabric and / or a spunbonded nonwoven fabric is preferable in consideration of suppressing a decrease in the flow rate of the liquid to be treated and reducing an increase in initial pressure loss when using a cartridge filter.
In addition, the pore size distribution is a value measured with a palm porometer in the range of 0.5 μm to 50 μm, preferably in the range of 2 μm to 15 μm, and may not be a density gradient from the inflow side to the outflow side. In consideration of the average particle diameter of the resin powder, it is preferable that the pore diameter be gradually increased from small to large from the inflow side to the outflow side. In this way, ion-exchange resin powders having different particle diameters are fixed in a substantially aligned manner from the inflow side to the outflow side of the filter medium at the pore diameters corresponding to the particle diameters.
Therefore, the liquid to be treated that passes through the pleated filter body flows evenly from the inflow side to the outflow side and is filtered, and the removal efficiency of harmful ions can be further enhanced.
[0020]
The inner surface support material 2b is made of a spunbond nonwoven fabric, and the outer surface support material 2c is preferably a net or a spunbond nonwoven fabric. Since the outer surface support material is intended to prevent the pleated filter material from sticking, the pore size is not particularly limited, but considering the pore size distribution of the filter material 2a, the span of the outer surface support material 2c More preferably, the minimum pore diameter of the bonded nonwoven fabric is the same as or larger than the pore diameter on the inflow side of the filter medium 2a.
[0021]
As the constituent fibers of the melt blown nonwoven fabric and the spunbond nonwoven fabric, nylon, polyester, polyethylene, polypropylene, fluorine, acrylic, polylactic acid, polyvinylidene chloride, etc. can be used alone or in combination with a plurality of appropriately selected types. In view of chemical resistance against polar solutions, it is desirable to use polyolefin fibers such as polyethylene and polypropylene, and fluorine fibers.
[0022]
Next, a manufacturing method of a cartridge filter provided with a pleated filter having an ion trapping removal function will be described with reference to FIG.
FIG. 3A is a schematic configuration diagram showing an example of a suction device for a first treatment solution used for adhering ion-exchange resin powder. This suction device has a liquid tank A containing a first treatment solution S1 in which ion-exchange resin powder is dispersed in a solvent (for example, toluene), and a synthetic resin disposed so as to be a circulation path for the first treatment solution. A pipe T, a pump P (for example, a diaphragm pump) for sucking the first processing solution provided in a part of the circulation path, and a stirrer U for stirring the first processing solution.
First, the cartridge filter F1 molded into a predetermined shape is immersed in the first processing solution S1, and one end of the tube T is connected to the outlet 6 of the upper end plate in the liquid directly or via a jig, and then the power source ( When not shown), the pump P and the stirrer U operate. And the 1st process solution S1 in the liquid tank A is continuously stirred by the stirrer U, and it circulates through the liquid tank A-pleat type filter body-core-outlet 6-pipe T-liquid tank A by the suction force of the pump P. Then flow.
Therefore, the cartridge filter in which the ion-exchange resin powder dispersed in the first treatment solution S1 adheres without causing unevenness in the valley portion and the peak portion of the pleat according to the flow rate of the first treatment solution passing through the pleated filter. F2 is obtained. Note that, by changing the suction amount of the pump P, the flow rate of the first treatment solution passing through the pleated filter can be changed.
[0023]
Next, FIG. 3B is a schematic configuration diagram showing an example of a second processing solution suction device used for fixing the ion exchange resin powder adhered to the pleated filter. This suction device includes a liquid tank B containing a second processing solution S2 obtained by dissolving a binder resin in a solvent (for example, toluene), a recovery tank C for recovering the second processing solution, and a pipe T connecting them. It comprises a pump P (for example, a diaphragm pump) that sucks the second processing solution provided in a part of the pipe line.
After the cartridge filter F2 produced in the above process is immersed in the second treatment solution S2, one end of the pipe T is connected to the outlet 6 directly or via a jig, and then the power source (not shown) is turned on, the pump P is turned on. Operate.
Therefore, the second treatment solution S2 flows into the liquid tank B-pleated filter body-core-outlet 6-tube T-recovery tank C, and the ion exchange resin powder adhered to the pleated filter body is fixed with the binder resin. A cartridge filter is obtained.
[0024]
The cartridge filter manufactured through the above steps is put into a drier adjusted to a predetermined temperature (for example, 60 ° C.), and the solvent is evaporated so that the second processing solution is not biased. Next, when the fixed ion exchange resin is a cation exchange resin, it is treated with an acid such as hydrochloric acid or sulfuric acid to change the ion form from Na form to 99.5% or more to H form, and when it is an anion exchange resin. Then, it is treated with an alkali such as sodium hydroxide to regenerate from C1 form to 99.5% or more OH form. Thereafter, after washing with pure water, moisture is removed by a drying process to produce a desired cartridge filter.
[0025]
By the way, in these cases, as the ion exchange resin, a cation exchange resin alone or a mixture with a regenerated H type chelate resin or a mixture of an anion exchange resin alone or a regenerated OH type chelate resin is removed. It can be appropriately selected depending on the type of the target metal ion. The mixing ratio when mixing is set according to the content of the liquid to be treated (ion concentration, type of ions to be removed, etc.) and determined by a filtration test.
[0026]
In addition, for the pulverized ion exchange resin powder, the particle diameter range is determined so that the lower limit of the particle diameter is larger than the minimum pore diameter of the filter medium. In consideration of the point that the reactivity increases and the reactivity becomes high, the range is from 2 μm to 70 μm, preferably from 5 μm to 40 μm, and more preferably from 10 μm to 30 μm.
[0027]
Specifically, the following can be used as the type of ion exchange resin. Strong acid cation exchange resins include styrene / divinylbenzene copolymer, sulfone group (-SO₃ ⁻) Is an exchange group type. In addition, as the weakly acidic cation exchange resin, a methacrylic acid / divinylbenzene copolymer type with carboxylic acid (—COOH) as an exchange group, an acrylic acid / divinylbenzene copolymer type with carboxylic acid as a functional group Etc.
As the chelating resin, styrene-divinylbenzene copolymer and iminodiacetic acid (-N = (CH₂COO)₂M), a polyamine type having a polyamine as a functional group in a styrene / divinylbenzene copolymer, a glucamine type having a glucamine group in a styrene / divinylbenzene copolymer, and the like.
As the strongly basic anion exchange resin, a styrene / divinylbenzene copolymer and a quaternary ammonium base (—N (—CH₃)₃・ Types having X and dimethylethanolammonium group (—N (—CH₃)₂-C₂H₄OH · X).
[0028]
Binder resins are generally thermoplastic resins such as ethylene / butene copolymers, ethylene / hexene copolymers, ethylene / acrylic acid ester / maleic anhydride terpolymers, ethylene / glycidyl methacrylate copolymers, ethylene / Ethylene resin such as glycidyl methacrylate terpolymer, polypropylene resin, fluorine resin, polyester resin, styrene / ethylene / butylene / styrene block copolymer (SEBS) and styrene / butadiene / styrene / styrene (SBBS) It is preferable to use a styrene resin, a urethane resin, or a silicone resin (deoxime type, dealcohol type, and addition type) alone or in a state of mixing two or more kinds.
[0029]
When these resins are used, they are soluble in organic solvents, so as the organic solvent evaporates, a large number of micropores are formed in the binder resin, and the liquid to be treated comes into contact with the ion exchange resin through the micropores. The reaction can be performed efficiently.
Of the above binder resins, olefin resins, particularly polyolefin resins, and particularly polyethylene resins are advantageous. This is because the polyolefin resin is excellent in the flexibility of the film film, and is an organic solvent used for diluting a polar solvent used in the cleaning process of the cartridge filter or a raw material for electronic industry, such as NMP (N-methyl-2-pyrrolidone). ), MEA (monoethanolamine), hydrofluoroether (manufactured by Sumitomo 3M), PGMEA (propylene glycol monomethyl ether acetate) and GBL (γ-butyrolactone) have almost no physical changes such as dissolution and swelling, and are stable. This is because the performance can be exhibited.
[0030]
The mixing ratio (weight ratio) of the ion-exchange resin powder and the solvent (for example, toluene, xylene, methanol, ethanol, etc.) in the first treatment solution is determined by the dispersibility of the powder in the solvent, the uniformity of adhesion to the filter medium, and the work. In consideration of properties (processing time) and the like, the ion-exchange resin powder is in the range of 0.5 g / l to 3.0 g / l, preferably 1.0 g / l to 2.0 g / l.
In addition, the amount of ion exchange resin powder attached to the filter is appropriately set according to the thickness, pitch, filtration area, etc. of the filter medium of the pleated filter, but the practical range also depends on the fineness and basis weight of the filter medium. Although it is different, the ion exchange resin powder is in a range of 50 parts to 200 parts, preferably 80 parts to 100 parts, by weight, with respect to 100 parts of the nonwoven fabric of the filter medium.
[0031]
【Example】
Hereinafter, although an example is given and explained concretely, the present invention is not limited to these. Moreover, in each Example, the pore diameter distribution of the nonwoven fabric which comprises the filtration sheet | seat of a pleated type filter body was measured using the palm porometer. Cartridge filter (diameter: 254mm) is a porous core (diameter 32mm x height 240mm), pleated filter (10mm pleat width, 125 mountains), outer cover (diameter 70mm x height 230mm), upper end plate It was composed of a processing liquid outlet in the center and a lower end plate.
[0032]
Example 1
A pleated filter was molded using the following substrate.
Filter material: 84 g / m², Density gradient type polypropylene melt blown nonwoven fabric with a thickness of 0.30 mm and a pore size distribution of 2 to 12 μm
Inflow side support material: Aperture length 1.8mm x width 1.0mm, basis weight 45g / m²Polypropylene net
Outflow side support material: Fineness 3.3dtex, basis weight 20g / m²Polypropylene spunbond nonwoven fabric
[0033]
The cartridge filter incorporating the pleated filter was immersed in a suction device, and the following treatment was sequentially performed to produce an ion removing cartridge filter.
(1) Adhesion of ion exchange resin
First treatment liquid: Cation exchange resin (SK1BH manufactured by Mitsubishi Chemical, ionic form H form) powder having an average particle size of 22 μm is uniformly dispersed in toluene (concentration: 1.5 g / l)
Flow condition: Flow rate 5 liters / minute x 15 minutes
Amount of ion exchange resin: approx. 40 g
(2) Adhesion with binder resin
Second treatment solution: polyethylene resin + toluene (concentration: 10% by weight)
Fluid flow conditions: Flow rate 0.5 l / min x 2 min
Polyethylene resin adhesion (wet weight): 300g
Evaporation of solvent at a drying temperature of 60 ° C
(3) Regeneration of ion exchange resin
Washed with 10% hydrochloric acid for electronics industry → Ion exchange resin is regenerated to 99.5% or more in the H form → Washed with pure water → Removed water by drying
When the pressure of the produced cartridge filter for ion removal was measured under the conditions of a water temperature of 20 ° C. and a flow rate of 10 liters / minute, the initial pressure loss before treatment was 0.010 kgf / cm.³In contrast, the initial pressure loss after the treatment was 0.034 kgf / cm.³Met.
[0034]
(Example 2)
A pleated filter was molded using the following substrate.
Filter medium: same as Example 1
Inflow side support material: same as Example 1
Outflow side support material: same as Example 1
[0035]
The cartridge filter incorporating the pleated filter was immersed in a suction device, and the following treatment was sequentially performed to produce an ion removing cartridge filter.
(1) Adhesion of ion exchange resin
First treatment solution: Anion exchange resin having an average particle size of 25 μm (TSA1200 manufactured by Mitsubishi Chemical Co., Ltd., ionic form OH) is uniformly dispersed in toluene (concentration: 1.5 g / l)
Flow condition: Flow rate 5 liters / minute x 15 minutes
Amount of ion exchange resin: approx. 40 g
(2) Adhesion with binder resin
Second treatment solution: polyethylene resin + toluene (concentration: 10% by weight)
Fluid flow conditions: Flow rate 0.5 l / min x 2 min
Polyethylene resin adhesion (wet weight): 300g
Evaporation of solvent at a drying temperature of 38 ° C
(3) Regeneration of ion exchange resin
Washing with 10% sodium hydroxide for electronics industry → Ion exchange resin is regenerated to 99.5% or more OH form → Washing with pure water → Removing moisture
When the pressure of the produced ion removal cartridge filter was measured under the same conditions as in Example 1, the initial pressure loss before treatment was 0.010 kgf / cm.³In contrast, the initial pressure loss after the treatment was 0.029 kgf / cm.³Met.
[0036]
(Example 3)
A pleated filter was molded using the following substrate.
Filter material: 45 g / m²Density-gradient polypropylene melt blown nonwoven fabric with a thickness of 0.22 mm and a pore size distribution of 0.5 to 6 μm
Inflow side support material: Fineness 3.3dtex, basis weight 20g / m²Polypropylene spunbond nonwoven fabric
Outflow side support material: Fineness 3.3dtex, basis weight 20g / m²Polypropylene spunbond nonwoven fabric
[0037]
The cartridge filter incorporating the pleated filter was immersed in a suction device, and the following treatment was sequentially performed to produce an ion removing cartridge filter.
(1) Adhesion of ion exchange resin
First treatment solution: Cation exchange resin (SK1BH manufactured by Mitsubishi Chemical, ionic form H form) powder having an average particle diameter of 8 μm is uniformly dispersed in toluene (concentration: 1.5 g / l)
Flow condition: Flow rate 5 liters / minute x 15 minutes
Amount of ion exchange resin: approx. 40 g
(2) Adhesion with binder resin
Second treatment solution: polyethylene resin + toluene (concentration: 10% by weight)
Fluid flow conditions: Flow rate 0.5 l / min x 2 min
Polyethylene resin adhesion (wet weight): 300g
Evaporation of solvent at a drying temperature of 60 ° C
(3) Regeneration of ion exchange resin
Washed with 10% hydrochloric acid for electronics industry → Ion exchange resin is regenerated to 99.5% or more in the H form → Washed with pure water → Removed water by drying
When the pressure of the produced ion removal cartridge filter was measured under the same conditions as in Example 1, the initial pressure loss before treatment was 0.021 kgf / cm.³In contrast, the initial pressure loss after the treatment was 0.118 kgf / cm.³Met.
[0038]
Example 4
A pleated filter was molded using the following substrate.
Filter medium: same as Example 1
Inflow side support material: Aperture length 1.8mm x width 1.0mm, basis weight 45g / m²Polypropylene net
Outflow side support material: same as Example 3
[0039]
The cartridge filter incorporating the pleated filter was immersed in a suction device, and the following treatment was sequentially performed to produce an ion removing cartridge filter.
(1) Adhesion of ion exchange resin
First treatment solution: 50% by weight of cation exchange resin (SK1BH, ionic form H form, manufactured by Mitsubishi Chemical) with an average particle diameter of 18 μm and chelate resin (CR-11, ionic form Na form, manufactured by Mitsubishi Chemical) having an average particle diameter of 18 μm 50% by weight of powder is uniformly dispersed in toluene (concentration: 1.5 g / l)
Flow condition: Flow rate 5 liters / minute x 15 minutes
Amount of ion exchange resin: approx. 40 g
(2) Adhesion with binder resin
Second treatment solution: polyethylene resin + toluene (concentration: 10% by weight)
Fluid flow conditions: Flow rate 0.5 l / min x 2 min
Polyethylene resin adhesion (wet weight): 300g
Evaporation of solvent at a drying temperature of 60 ° C
(3) Regeneration of ion exchange resin
Washed with 10% hydrochloric acid for electronics industry → Ion exchange resin is regenerated to 99.5% or more in the H form → Washed with pure water → Removed water by drying
When the pressure of the produced ion removal cartridge filter was measured under the same conditions as in Example 1, the initial pressure loss before treatment was 0.010 kgf / cm.³In contrast, the initial pressure loss after treatment was 0.042 kgf / cm.³Met.
[0040]
Next, a cation exchange resin (adhesion amount 74 g / m) was applied to the cartridge filter of Examples 1 and 2 and the filter medium.²) And an anion exchange resin (adhesion amount 74 g / m) on the filter medium.²The following evaluation test was performed using the cartridge filter of Comparative Examples 1 and 2 in which a pleated filter body was molded using a base sheet pre-coated with).
[0041]
(Evaluation test)
As test solution A, NMP (N-methyl-2-pyrrolidone) and iron ions (Fe²+) And copper ions (Cu²The liquid which adjusted +) to 25 ppm and 22 ppm was used. A total of 8.4 liters was passed through the filters of Example 1 and Comparative Example 1 at a flow rate of 600 ml / min. 200 ml was sampled from the outlet, and each ion concentration was measured by ion chromatography.
Further, as test solution B, nitrate ions (NO) were added to NMP.^3-), Sulfate ion (SO₄ ^2-) Chlorine ion (Cl⁻) Were adjusted to 30 ppm, 23 ppm, and 20 ppm, respectively. A total of 8.4 liters was passed through the filters of Example 2 and Comparative Example 2 at a flow rate of 600 ml / min. 200 ml was sampled from the outlet, and each ion concentration was measured by ion chromatography.
[0042]
As a result of the evaluation test, the results of Table 1 for the test solution A and the results of Table 2 for the test solution B were obtained.
[0043]
[Table 1]

[0044]
[Table 2]

[0045]
As is apparent from Tables 1 and 2, it was found that the product of the present invention is superior in that the removal efficiency of harmful ions is improved by about 20 to 30% as compared with the comparative example.
[0046]
【The invention's effect】
According to the first aspect of the present invention, since the ion trapping powder is distributed so as to correspond to the flow rate of the liquid to be processed passing through the pleated filter, harmful ions can be efficiently removed even with the same amount of adhesion as in the prior art. It can be removed and the removal efficiency can be improved.
[0047]
According to the second aspect of the present invention, it is possible to prevent an increase in pressure loss and a reduction in harmful ion removal efficiency.
[0048]
According to the third aspect of the present invention, the liquid to be treated passes substantially uniformly through the filter medium and sufficiently comes into contact with the ion-removed powder, and the removal efficiency of harmful ions can be further improved. Even if the filter medium is made thicker, the ion-trapping powder is attached according to the density gradient of the filter medium, and the removal efficiency of harmful ions can be further improved.
[0049]
According to the fourth aspect of the present invention, it is possible to easily manufacture an ion removal cartridge filter in which the ion-trapping powder is fixed corresponding to the flow of the liquid to be processed, and to meet various needs of users. A product can be manufactured even in a large variety and a small lot without reducing the production efficiency.
[Brief description of the drawings]
FIG. 1 is a partially broken perspective view showing an embodiment.
FIG. 2 is a schematic enlarged schematic view showing an adhesion state of ion exchange resin powder.
3A is a schematic view of a suction device used in an ion exchange resin powder attaching step, and FIG. 3B is a schematic view of a suction device used in an ion exchange resin powder fixing step.
FIG. 4 is a partially broken perspective view of a conventional cartridge filter.
FIG. 5 is a cross-sectional view of a base sheet.
FIG. 6 is a schematic diagram showing the state of adhesion of an ion exchange resin according to the prior art.
[Explanation of symbols]
1 ... Core
2 ... Pleated filter
2a ... Filter material
2b ... Inside support material
2c ... External support material
3 ... Outer cover
4 ... Upper end plate
5: Lower end plate
6 ... Outlet
7 ... Ion exchange resin powder
A, B ... Liquid tank
C ... Recovery tank
F: Cartridge filter
P: Pump
S1 ... First treatment tank
S2 ... ・ Second processing tank
T ... Tube
U: Stirrer

Claims (4)

A cartridge filter comprising a pleated filter body that is folded around the outer periphery of a cylindrical core having a large number of holes with a filter medium sandwiched between at least two support members, the pleated filter A cartridge filter for ion removal, characterized in that an ion-trapping powder fixed to a body is attached by suction force from a filter suction direction. The cartridge filter for ion removal according to claim 1, wherein the pore size distribution of the filter medium is 0.5 μm to 50 μm. 2. The pore size distribution of the filter medium is 0.5 μm to 50 μm, a density gradient that decreases from the inflow side to the outflow side, and the minimum particle size of the ion trapping powder is larger than the minimum pore size of the filter medium. The cartridge filter for ion removal as described in 2. A pleated type cartridge filter comprising a filter body, which has a pleated fold with a filter medium sandwiched between at least two support members on the outer periphery of a cylindrical core having a large number of holes, a liquid containing a processing solution Manufacture of a cartridge filter for ion removal characterized by having a step of immersing in a tank and sucking a treatment solution from the filter suction direction to sequentially and simultaneously adhere and fix the ion-trapping powder to the filter body. Method.

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