JP2002143844A - Cartridge type ion exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cartridge type ion exchanger in which the inner packing material can be easily attached and detached and the packing rate of the ion exchange resin can be easily controlled to the optimum proportion according to the quality of the water to be treated without causing any problem such as ion leak. SOLUTION: In the cartridge type ion exchanger, at least one kind of the following resin elements is disposed in the axial direction of the housing where water can be passed in the axial direction. The resin elements are an anion exchange resin element housing an anion exchange resin layer, a cation exchange resin element housing a cation exchange resin layer, and a mixture resin element housing a mixture resin layer of an anion exchange resin and a cation exchange resin, and each element is held in a specified form.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detachable cartridge type ion exchanger, in which the ion exchange resin to be filled therein can be easily attached and detached, and the mixing ratio of the ion exchange resin to be filled therein is substantially free. The present invention relates to a cartridge-type ion exchanger that can be set to.

[0002]

2. Description of the Related Art In a standard ion exchange apparatus, a cation exchange resin or an anion exchange resin such as a pure water apparatus, a soft water apparatus and a denitrification apparatus may be filled as a single product, or a mixed resin may be filled. . Also, as an array method,
Techniques are widely used in which a cation exchange resin tower / anion exchange resin tower is connected in series, or a mixed resin tower is arranged at the subsequent stage so that the ion exchange resin can effectively act on both cations and anions. ing.

In using a mixed resin, the volume ratio of anion exchange resin to cation exchange resin is 1: 2,
1: 1, 1: 1.5, etc. are used as standard, and other ratios are rarely used.

On the other hand, as an ion exchanger, the apparatus itself does not have a function of regenerating the ion exchange resin, and is configured to be detachable together with the ion exchanger, or it is easy to use only the ion exchange resin with the ion exchanger housing mounted. There is known a cartridge type ion exchanger which can be replaced. In such a cartridge type ion exchanger, it is often required to set the volume ratio of the ion exchange resin to be filled therein to an optimum mixing ratio according to the quality of the water to be treated. As a rule,
Ratios similar to those in the standard ion exchange device described above are employed.

[0005]

However, in an ion exchanger, particularly a cartridge type ion exchanger, depending on the quality of the water to be treated, it is desired to use the ion exchange resin in a range exceeding the volume ratio of the ion exchange resin as described above. There is. For example, when treating water having a large anion load, it is desired to increase the amount of anion exchange resin, and it is desired to increase the ratio of the cation exchange resin to the anion exchange resin to about 1: 5 or more. Sometimes.

However, when such a volume ratio is adopted,
It is very difficult to uniformly mix each ion exchange resin, and the ion exchange resin having a small volume ratio tends to be unevenly distributed in the ion exchange resin having a large volume ratio in the formed resin layer. When the water to be treated is passed through the mixed resin layer under such conditions, the probability of contact between the trace cation (or anion) component and the ion-exchange resin on the side with a small ratio decreases. If the ion component to be removed flows out without sufficiently contacting the corresponding ion exchange resin, each ion exchange resin itself has good selective adsorption characteristics, while ion leak occurs on the treated water side, May cause poor water quality.

SUMMARY OF THE INVENTION An object of the present invention is to make it easy to attach and detach the internal filling material and to avoid inconveniences such as ion leak.
An object of the present invention is to provide a cartridge type ion exchanger in which a filling ratio of an ion exchange resin can be easily set to an optimum ratio according to the quality of water to be treated.

[0008]

In order to solve the above problems, a cartridge type ion exchanger according to the present invention comprises an anion exchange resin layer held in a predetermined shape in a housing through which water can flow in an axial direction. In the axial direction of the housing, at least one element of an anion exchange resin element incorporating a, a cation exchange resin element incorporating a cation exchange resin layer, and a mixed resin element incorporating a mixed resin layer of an anion exchange resin and a cation exchange resin. It is characterized by being arranged.

In this cartridge type ion exchanger, the ion exchange resin filled in the housing is filled in the form of an element holding the ion exchange resin layer in a predetermined shape, and a plurality of elements are arranged in the housing. Is established. Since the flow of the resin is substantially prevented in each element, for example, in the case of a mixed resin of an anion exchange resin and a cation exchange resin, a uniform mixed state in the element is maintained as it is. Therefore,
By arranging such elements in a plurality of housings, compared to a case where the mixed resin is simply filled in the entire housing, a uniform mixing state is better maintained in each part in the housing, and there is a risk of uneven distribution in the related art. Therefore, it is possible to set the mixing ratio up to the volume ratio that was not possible. From this point of view, even if the element provided in the housing is of one type, a sufficiently favorable uneven distribution preventing effect can be obtained. However, in the present invention, when at least two types of elements are provided, a particularly great effect is obtained, and in addition to the above-described uneven distribution preventing effect, the ratio of the ion exchange resin to be filled is set substantially freely. It is possible to do.

As each element, for example, a cylindrical body,
It consists of a water-permeable internal resin holding plate (for example, a mesh) disposed on both end surfaces thereof, and an ion exchange resin filled in the cylinder. It is preferable that sealing means is interposed between the cylinder of the element and the inner surface of the housing. Also,
When the cartridge-type ion exchanger is used horizontally, a plurality of elements housed in the housing are pressed in one direction to connect and hold a plurality of elements arranged in the housing in a predetermined form. Pressing means may be provided. Alternatively, the housing may be filled with the element without any gap, or a slight gap may be filled with a water-permeable packing material to fill the gap.

In the cartridge type ion exchanger according to the present invention, when the type of ion exchange resin to be filled in the housing and the ratio thereof are determined in accordance with the quality of the water to be treated, the mixing ratio is determined. Thus, a plurality of elements are selected from the anion exchange resin element, the cation exchange resin element, and the mixed resin element, and the selected elements are sequentially housed in the housing. Similarly, in the case of replacement, each ion exchange resin layer formed in the housing is replaced in the form of an element. Since the ion exchange resin is attached and detached in the form of an element, attachment and detachment and exchange are extremely easy. That is, when the ion-exchange resin is directly filled in the housing, the ion-exchange resin attached to the bottom or the wall of the housing cannot be removed with one touch in order to take it out of the housing. When the ion exchange resin is filled in the element, all the ion exchange resin in the housing can be removed by one-touch operation of removing the element from the housing. Further, in each element, the shape of the resin layer is fixed to a predetermined constant shape, and since the resin does not flow between the elements, a desirable form of each ion exchange resin layer, and in the case of a mixed resin layer, In such a case, a desired uniform mixing state is maintained as it is. Therefore, after filling the ion exchange resin into the housing, there is no need to perform any other operation such as uniform mixing in the housing.

Further, as long as an anion exchange resin element, a cation exchange resin element, and a mixed resin element of a predetermined size obtained by dividing the internal volume of the housing into a predetermined number are prepared, the elements to be accommodated are selected. By determining the ratio, the ratio of the ion exchange resin in the housing (the ratio between the anion exchange resin and the cation exchange resin) can be set substantially freely. That is, the ratio of the ion exchange resin to be filled can be freely and easily set according to the quality of the water to be treated. In addition, at this time, as described above, the shape of the ion exchange resin layer in each element is kept constant, and even in the case of the mixed resin layer, the uniform mixing state in the element is favorably maintained. Even if a resin ratio having a large difference between the amount of anion exchange resin and the amount of cation exchange resin that could not be adopted is adopted, the disadvantage that the ion exchange resin having a small ratio is unevenly distributed in the ion exchange resin having a large ratio. Occurrence is avoided,
The water to be treated comes into good contact with each ion exchange resin. As a result, the selective adsorption of each ion exchange resin to the water to be treated is favorably exhibited, and ion leak to the treated water side is prevented.

[0013]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 and FIG.
1 shows a cartridge type ion exchanger according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes the entire cartridge type ion exchanger. The cartridge type ion exchanger 1 has a cylindrical housing 2 through which water to be treated can flow in the axial direction. The housing 2 is filled with a predetermined ion exchange resin, and each ion exchange resin is filled in the form of an element. The elements include an anion exchange resin element 3 containing an anion exchange resin layer held in a predetermined shape, a cation exchange resin element 4 containing a cation exchange resin layer held in a predetermined shape, and an anion exchange resin held in a predetermined shape. And a mixed resin element 5 containing a mixed resin layer of a cation exchange resin and at least one, preferably two or more elements are selected from these, depending on the quality of the water to be treated. The selected elements are arranged in a predetermined order in the axial direction of the housing 2.

Each element is configured, for example, as shown in FIG. The ion-exchange resin element 6 includes a cylindrical member 7, meshes 8 a and 8 b (or perforated plates) disposed on both end surfaces of the cylindrical member 7 as water-permeable internal resin holding plates, and an inner surface of the cylindrical member 7. The entire layer shape is fixed and held by the meshes 8a and 8b in a fixed shape, and the ion exchange resin layer 9 is formed. An annular sealing material 10 as sealing means is interposed between the outer peripheral surface of the cylinder 7 of the element 6 and the inner surface of the housing 2 to prevent a short circuit therebetween. The mesh 8a on the upstream side is
The mesh 8 on the downstream side functions as a distributor for the ion exchange resin layer 9 and functions as a strainer for preventing resin outflow.

When the cartridge-type ion exchanger is used horizontally, a pressing means for pressing a plurality of elements housed in the housing 2 in one direction may be provided. For example, as shown in FIG. 3, a spring 11 as a pressing means is provided at one end side in the housing 2, and the spring 11 connects and holds the plurality of elements 6 in a predetermined arrangement with a predetermined pressing force. It is possible to Alternatively, as described above, the spring 11 may be filled with a water-permeable packing material for filling the gap.

In the cartridge type ion exchanger 1 as described above, the ion exchange resin filled in the housing 2 is attached and detached in the form of elements, respectively. The target ion exchange resin layer form is completed only by attaching and detaching the ion exchange resin in the inside 2. Therefore, attachment and detachment of ion exchange resin,
The exchange is very easy.

Further, by appropriately setting the number of divided elements in the housing 2 and appropriately setting the type and number of elements to be accommodated in the housing 2, the configuration of an arbitrary ion exchange resin layer, that is, The composition ratio of the ion exchange resin in the housing 2 can be set substantially freely.

For example, for a housing 2 having a capacity of 1 L,
200 ml as ion exchange resin element that can be stored
Prepare the elements of As described above, when an anion exchange resin element, a cation exchange resin element, and a mixed resin element (anion exchange resin: cation exchange resin = 1: 1) are prepared as described above,
The composition ratio of the ion exchange resin obtained by combining the kinds of elements is as follows: cation exchange resin / anion exchange resin = 1/1, 2/3, 3/7, 1/4, 3/2, 7/3,
There are seven types, ie, 4/1, and it is possible to easily adopt a component ratio that cannot be taken by the conventional ion exchanger. The number of combinations can be adjusted in any way by adjusting the volume per element.

Each of the ion-exchange resin layers has a housing 2 in the form of an element whose shape is kept constant.
Since it is mounted inside, the desired shape of the resin layer is maintained as it is, and the flow between the respective ion exchange resin layers is also prevented. In particular, in the mixed resin layer, the uniformly mixed state is maintained as it is. Therefore, even in the entire housing 2, the disadvantage that the ion exchange resin having a small composition ratio is unevenly distributed in the ion exchange resin having a large composition ratio is reliably avoided. As a result, the water to be treated comes into contact with the ion exchange resin to be contacted at each part in the housing 2, and the ionic species to be adsorbed are surely adsorbed and removed. Since the filled ion exchange resins can sufficiently exhibit predetermined selective adsorption characteristics, ion leak to the treated water side is prevented, and excellent quality of treated water is ensured.

A more specific example of the arrangement of each element in the housing 2 will be described. For example, when a mixed resin in which the amount of the anion exchange resin is four times the amount of the cation exchange resin is required, the respective elements can be arranged, for example, as shown in FIG. That is, from the upstream side to the downstream side, the anion exchange resin element 3
And two mixed resin elements 5 (cation exchange resin: anion exchange resin = 1: 1). In a cross section perpendicular to the flow of the water to be treated, the cation exchange resin is considered to be distributed almost uniformly, so that the water to be treated contacts the cation exchange resin evenly. Therefore, even if an amine eluate or the like from the anion exchange resin is generated, it is surely adsorbed by the cation exchange resin existing on the downstream side.

For a similar request, for example, FIG.
It is also possible to adopt the arrangement shown in FIG. That is, four anion exchange resin elements 3 are arranged on the upstream side, and the cation exchange resin elements 4 are arranged on the most downstream side. Even in this case, the eluted amine and the like from the anion exchange resin are surely adsorbed by the cation exchange resin disposed on the most downstream side.

[0022]

As described above, according to the cartridge type ion exchanger of the present invention, the attachment / detachment of the ion exchange resin,
Exchange becomes extremely easy, and the composition ratio of the ion exchange resin to be filled in the housing can be set easily and substantially freely. Since the composition ratio of the ion exchange resin can be set to the optimal ratio and each ion exchange resin layer in the housing can be maintained in a desired state,
Good quality of treated water can be ensured even when used for a long time.

As described above, each ion exchange resin layer to be filled is made into an element, thereby facilitating attachment / detachment and allowing the resin composition ratio to be arbitrarily set. It becomes possible to apply as an ion exchange resin built-in part which is extremely easy to handle to equipment in all industrial fields such as products and transportation equipment. In addition, new filling and replacement of used resin at the assembly plant in the ion exchanger can be replaced with standardized work that simply handles predetermined elements, greatly improving assembly and replacement work. You can also measure.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a cartridge type ion exchanger according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of an ion exchange resin element accommodated in the cartridge type ion exchanger of FIG.

FIG. 3 is a schematic sectional view of a cartridge type ion exchanger showing an example in which a pressing means is arranged.

FIG. 4 is a schematic configuration diagram showing an example of arrangement of an ion exchange resin element.

FIG. 5 is a schematic configuration diagram showing another arrangement example of the ion exchange resin element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cartridge type ion exchanger 2 Housing 3 Anion exchange resin element 4 Cation exchange resin element 5 Mixed resin element 6 Ion exchange resin element 7 Cylindrical body 8a, 8b Mesh as internal resin holding plate 9 Ion exchange resin layer 10 As sealing means Annular sealing material 11 Spring as pressing means

Claims (4)

[Claims] 1. An anion exchange resin element having a built-in anion exchange resin layer, a cation exchange resin element having a cation exchange resin layer, and an anion exchange resin. A cartridge-type ion exchanger characterized in that at least one element of a mixed resin element containing a mixed resin layer of a resin and a cation exchange resin is disposed in an axial direction of a housing. 2. The cartridge-type ion exchanger according to claim 1, wherein at least two types of elements are provided. 3. The cartridge-type cartridge according to claim 1, wherein each element comprises a cylindrical body, a water-permeable internal resin holding plate disposed on both end faces thereof, and an ion exchange resin filled in the cylindrical body. Ion exchanger. 4. The cartridge type ion exchanger according to claim 3, wherein sealing means is interposed between the cylinder of the element and the inner surface of the housing.