JPS6075337A - Regeneration method of ion exchange resin - Google Patents

Abstract

PURPOSE:To regenerate ion exchange resin readily without using acid or alkali by impressing an electric voltage directly to the ion exchange resin in the water and to remove ions caught by the resin from the resin by the electric attractive force. CONSTITUTION:A vessel 1 is partitioned by an ion-permeative porous membrane 2 to form an anode chamber 7 and a cathode chamber 8 therein, and charging cation exchange resin 5 and anion exchange resin 6 requiring regeneration in respective chambers. Water is filled in both electrode chambers 7, 8 and electric current is fed to the anode plate 3 and a cathode plate 4. Cations (except H ion) such as Na ions captured by the cation exchange resin 5 migrate toward the cathode chamber 8 through a diaphragm 2; on one hand, anions (except OH ion) such as Cl ions captured by the anion exchange resin 6 migrate toward the anode chamber 7 through the diaphragm 2.

Description

[Detailed description of the invention] Technical fields> The present invention relates to the regeneration of ion exchange resins.

<Prior Art> Ion exchange resins are made by adding functional groups with ion exchange properties to a polymer base, and are used for water treatment, purification of sugars, drugs, solvents, etc. However, the biggest drawback of ion exchange resins is the regeneration of the resin after ion exchange.
Strongly acidic cation exchange resins that require acid or alkali and have sulfonic acid groups as exchange groups, and strongly basic anion exchange resins that have quaternary ammonium groups have poor regeneration efficiency.
The point is that human acids and alkalis are required for regeneration, and the current situation is that regeneration requires a great deal of effort.

<Object of the Invention> The present invention has been made in view of the above problems, and its objective is to simply regenerate 1 meter of resin without using acid or alkali.

SUMMARY OF THE INVENTION This object is achieved according to the invention by applying a DC voltage to the ion exchange resin in water and removing the ions captured by the resin from the resin by means of electrical attraction.

<Example> Hereinafter, details of the present invention will be explained based on the drawings.

1, 2, and 3 show embodiments of the present invention, in which 1 is a container, 2 is an ion-permeable porous membrane such as bisque or cellophane, 3 is an anode plate, and 4 is an anode plate. is a cathode plate, 5 is a cation exchange resin, 6 is an anion exchange resin, 7 is an anode chamber, 8
indicates a cathode chamber, and 9 indicates an intestinal ion exchange resin, an anion exchange resin, or a mixture of a cation exchange resin and an anion exchange resin.

In FIG. 1, a cation exchange resin 5 and an anion exchange resin 6 that require regeneration are separated by a diaphragm 2 and placed in an anode chamber 7 and a cathode chamber 8, respectively. When the bipolar chamber is filled with water and energized, cations such as thorium ions (excluding hydrogen ions) captured by the cation exchange resin 5 due to electrical attraction.
moves through the diaphragm 2 to the cathode chamber 8. On the other hand, anions such as chloride ions (excluding hydroxide ions) captured by the anion exchange resin 6 move to the anode chamber 7 via the diaphragm 2 . After a certain period of time, almost no cations other than hydrogen ions exist in the anode chamber 7, and very few anions other than hydroxide ions exist in the cathode chamber 8, and the cation exchange resin 5 The anion exchange resin 6 is regenerated and changes from the salt form of Na type and C1 type to H type and OH type having exchange ability. In FIG. 2, the respective signals are reproduced through a similar process.

In reality, there are many cases where one type of ion exchange resin is used alone, or a mixture of cation exchange resin and anion exchange resin is used for water treatment, such as in a mixed bed system.
The data is reproduced 5 times by the method shown in FIG. Taking mixed bed type ion exchange resin regeneration as an example, a mixture 9 of a cation exchange resin and an anion exchange resin is placed in an intermediate chamber separated by a pair of diaphragms 2, 2. The pair of diaphragms 2,
Anodes on both sides of 2.3. When the cathode 4 is placed, filled with water, and energized, cations such as sodium (excluding hydrogen ions) captured by the cation exchange resin in the mixture 9 move to the cathode chamber 8 via the diaphragm 2 due to electrical attraction. Also, anions such as chloride ions (excluding hydroxide ions) captured by the anion exchange resin move to the anode chamber 7 via the diaphragm 2 .

As a result, almost no ionic species exist in the intermediate chamber containing the mixture 9, and the ion exchange resin is regenerated.

Specific examples are shown below, but the present invention is not limited thereto.

(Specific example) Na type strongly acidic cation exchange resin (Diaion 5K-
1,B) 10d, C1 type strongly basic anion exchange resin (
Diaion SA-10A) 20m7! using the first
I made it to 11th grade using the method shown in the figure. The relationship between the amount of energization and the capacity of the recycled resin is as shown in FIG. 4, and as the amount of energization increases, the exchange capacity increases, and electrical regeneration is possible.

Effect> As explained in detail above, by using the method of the present invention, ion exchange resin can be easily regenerated by simply applying electricity without using acids or alkalis, and the ion exchange resin can be used repeatedly. This makes it easy to use and is very advantageous for automating desalination and regeneration.

[Brief explanation of drawings]

1 to 3 are diagrams each showing an embodiment of the present invention. Figure 4 shows Na-type strongly acidic cation exchange resin, C
I! FIG. 2 is a diagram showing the relationship between the amount of electricity applied and the exchange capacity of the regenerated resin in the case of regeneration using the method of FIG. 1 using a strongly basic anion exchange resin. Explanation of symbols 1: Container, 2: Ion-permeable porous membrane (1 membrane), 3:
Anode plate, 4: Cathode plate, 5: Cation exchange resin, or a mixture of cation exchange resin and anion exchange resin. Agent Patent attorney Aihiko Fuku (and 2 others) Figure 4

Claims (4)

[Claims] (1) A method for regenerating an ion exchange resin, which comprises placing electrodes on both sides of the ion exchange resin and regenerating it by applying a DC voltage in water. (2) A cation-exchange resin and an anion-exchange resin are separated by an ion-permeable porous one-box membrane, and a voltage is applied from both sides of the resins. Method for regenerating the described ion exchange resin. (3) A patent characterized in that a cation exchange resin and an anion exchange resin are separated by an ion-permeable porous membrane, and further, both electrodes are placed on both sides of these resins with the membrane separated, and a voltage is applied. A method for regenerating an ion exchange resin according to claim (1). (4) An ion-permeable porous diaphragm is placed on both sides of a cation exchange resin, an anion exchange resin, or a mixture of both exchange resins, and voltage is applied from electrodes on both sides of the membrane. A method for regenerating an ion exchange resin as described in (+).