JP2012240029A - Deionizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deionizer which has a structure improved in a comparatively easy manner using elements of existing equipment so that a weak acid does not leak even when the superficial velocity of water to be treated is increased.SOLUTION: In the deionizer including a column whose inside is filled with an ion exchange resin or a chelate resin, deionized water is collected through a filter formed of resin fiber containing an ion exchange group or a chelate group.

Description

  The present invention relates to a deionization apparatus. In the present invention, the deionization apparatus means an apparatus including an ion exchange resin tower or a chelate resin tower in which an ion exchange resin or a chelate resin is packed in the tower.

  As one of the ion exchange resin towers, a type in which water flow is performed in a downward flow and regeneration is performed in an upward flow is known, and its structure is generally filled with an ion exchange resin in the tower, A regenerant supply main pipe and a plurality of regenerant supply branch pipes branched therefrom are arranged on the upper surface of the flat plate at the bottom of the tower. The regenerant supply main pipe and the regenerant supply branch pipe Sometimes, a collecting pipe is formed to collect treated water (Patent Document 1). There is also known an ion exchange resin tower in which a liquid collection filter is installed at the bottom of the tower and water to be treated is collected through the filter. The structure of the chelate resin tower is the same as that of the above ion exchange resin tower except that the chelate resin is filled in the tower.

  By the way, in general industrial water which is treated water, boron of about several tens μg / L is contained in the form of boric acid, but boric acid is a very weak acid, so depending on the ion exchange resin tower, It is known that it cannot be removed sufficiently.

  Moreover, as a method for removing boric acid, a method using a chelate resin tower in which a chelate resin such as boron-selective glucamine type is filled in the tower is known, but it is faster when the superficial velocity of the water to be treated is increased. It is known that there is a problem that boric acid leaks from the stage.

  In any case, in the case of an ion exchange resin or a chelate resin, the diffusion rate until the target ions reach the functional group introduced into the particulate resin matrix is rate-limiting. A resin having a porous base structure for improving the reaction rate is also known, but it cannot be said that it can be processed at a sufficiently high speed. Therefore, the use of ion exchange fibers is also conceivable, but due to the drawback that the bulk density of the fibers themselves and the functional groups is small, an industrial scale apparatus has not been realized.

JP 2002-18433 A

  The present invention has been made in view of the above circumstances, and its object is to collect treated water substantially free of weak acids such as boric acid by a relatively simple structural improvement. It is to provide a deionization apparatus.

  That is, the gist of the present invention is to collect deionized water through a filter formed of resin fibers containing ion exchange groups or chelate groups in a deionization apparatus in which an ion exchange resin or a chelate resin is packed in the tower. The present invention resides in a deionization apparatus characterized in that liquid is performed.

ADVANTAGE OF THE INVENTION According to this invention, the deionization apparatus by which the leak of a weak acid does not occur is provided even if it increases the superficial velocity of to-be-processed water by the comparatively simple structural improvement using the component of the existing installation.
The above problem is solved.

Overall conceptual explanatory diagram of an example of a deionization apparatus of the present invention Typical plane explanatory drawing which shows the flat plate of the tower bottom in an example of the deionization apparatus of this invention, and the regenerant supply piping (collection piping) arrange | positioned on the upper surface

  Embodiments of the present invention will be described below with reference to the accompanying drawings. First, the basic structure of the deionization apparatus of the present invention will be described. The deionization apparatus shown in FIGS. 1 and 2 is of a type in which water flow is performed in a downward flow and regeneration is performed in an upward flow, and its basic structure is the same as that of a conventional deionization apparatus.

  In the above deionizer, an ion exchange resin or a chelate resin (2) is packed in the tower (1). The tower (1) illustrated in FIG. 1 has a flat plate structure at the bottom and top, but either or both may have a mirror structure. As the ion exchange resin, a strong acid cation exchange resin, a weak acid cation exchange resin, a strong base anion exchange resin, or a weak base anion exchange resin is appropriately used depending on the purpose. As the chelate resin, for example, a boron selective adsorption resin in which an N-methyl-glucamine group is introduced into a styrene resin is preferably used.

  In the case of the above deionizer, a plurality of regenerant supply branch pipes (50) are arranged on the upper surface of the flat plate portion (11) at the bottom of the tower. The regenerant supply branch pipe (50) is branched from the regenerant supply main pipe (5). In the case of the illustrated apparatus, since the bottom of the tower has a flat plate structure, the flat plate portion (11) is constituted by the tower bottom itself, but when the tower bottom has a mirror structure, a separate flat plate portion is formed. The regenerant supply main pipe (5) and the regenerant supply branch pipe (50) constitute a lower collecting pipe when water flows.

  At the time of water flow, the water to be treated is supplied from the upper liquid collection branch pipe (30) via the upper liquid collection main pipe (3) arranged at the top of the tower, and the treated water is supplied to the lower liquid collection pipe, The regenerant supply branch pipe (50) and the regenerant supply main pipe (5) are extracted. At the time of regeneration, the regenerant is supplied from the regenerant supply main pipe (5) and the regenerant supply branch pipe (50), and the regeneration waste liquid is the upper liquid collection branch pipe (30) and the upper liquid collection main pipe (3 ).

  Switching between the functions as described above during water flow and regeneration is performed by operating switching valves (not shown) installed in the upper liquid collection main pipe (3) and the regenerant supply main pipe (5). .

  The deionization apparatus of the present invention is characterized in that the deionized water collection is performed through a filter formed of resin fibers (functional group-containing resin fibers) containing ion exchange groups or chelate groups. In the regenerant supply pipe (collection pipe) illustrated in FIG. 2, a plurality of liquid passage holes are provided on the surface of the regenerant supply branch pipe (50), and a functional group is contained on the surface of the regenerant supply branch pipe (50). A tubular filter (4) is formed by winding resin fibers.

  Examples of the resin fiber include polyolefin (polyethylene, polypropylene, etc.), nylon, polytetrafluoroethylene, and the like. Of course, it may be a copolymer. Examples of the ion exchange group or chelate group include those similar to those possessed by the ion exchange resin or chelate resin, but they are not necessarily the same. As a method for incorporating an ion exchange group or a chelate group into a resin fiber, a method in which radiation graft polymerization technology is applied is generally adopted (“Graft Polymerization Recipe” (Shinichi Saito, Takanobu Sango, Maruzen). (Issued February 15, 2008.) In this case, the resin fiber may be processed into a woven fabric or a non-woven fabric, and a method of kneading an ion exchange resin or a chelate resin into the fiber forming resin is also employed. In some cases, commercially available ion exchange fibers, for example, products “IEF-SC”, “IEF-SA”, “IEF-WA”, etc., manufactured by Nichibi Co., Ltd.) can be used.

  In the illustrated example, a tubular filter (4) is formed by wrapping a functional group-containing resin fiber around the surface of the regenerant supply branch pipe (50), but a deionization in which a liquid collection filter is installed at the bottom of the tower. In the apparatus, the liquid collection filter may be composed of functional group-containing resin fibers. The upper liquid collection branch pipe and the upper liquid collection main pipe are not limited to those shown in the drawings, and can have various structures in the same manner as a known deionization apparatus.

  Since the deionization apparatus of the present invention uses the components of the existing equipment as described above, it can be easily improved to collect treated water that does not substantially contain a weak acid such as boric acid. .

1: tower 11: flat plate part 2: ion exchange resin or chelate resin 3: upper liquid collection main pipe 30: upper liquid collection branch pipe 4: filter formed of functional group-containing resin fiber 5: regenerant supply main pipe 50 : Regenerant supply branch pipe 51: Gap between regenerant supply branch pipes

Claims (1)

In a deionization device in which ion exchange resin or chelate resin is packed in the tower, deionized water is collected through a filter formed of resin fibers containing ion exchange groups or chelate groups. A deionizer characterized by the following.

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