JPS60102948A - Anion exchange resin for concentrating boron isotope - Google Patents

Abstract

PURPOSE:To enable to efficiently concentrate a boron isotope, by using the titled anion exchange resin having a specified volume change ratio. CONSTITUTION:In an anion exchange resin used in concentrating a boron isotope by passing boric acid through an ion exchange resin bed formed of an aminopolyol-type anion exchange resin to provide a boric acid adsorption zone followed by passing an acidic solution therethrough, the volume change ratio represented by formula I , wherein V1 is the volume of the resin in the free amine form in water, and V2 is the volume of the resin with hydrochloric acid adsorbed thereon in water, is set to be 8-30. The anion exchange resin is a resin which has an aminopolyol group of formula II, wherein n is an integer of 1-6, R is H, a 1-5C alkyo group or -CH2-(CHOH)m-CH2OH, wherein m is 0 or 1-6, as a functional group. The anion exchange resin can be used for efficiently concentrating the boron isotope.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an anion exchange resin for concentrating boron isotopes. More specifically, the aminopolyol type anion exchanger for boron isotope condensation with specific physical properties 1#
It's about fat.

Boron naturally contains about -20% boron 10 (, B).

Boron // (B) is present in a proportion of about 70%.

Among these, BFf: has excellent properties as an absorber of neutrons generated by nuclear reactions, etc., and is used as a neutron absorber such as control rods in various nuclear reactors, and is an essential material in the nuclear power industry. It is.

However, as mentioned above, B has a natural abundance ratio of λθ, and the remainder is DB with almost no neutron absorption capacity, so in order to efficiently absorb neutrons in a nuclear reactor etc. and control it, i- It is necessary to separate and concentrate 10B from natural boron, which is an isotopic mixture of B and HB.

One known method for separating boron isotopes is to use multiple ion exchange towers filled with ion exchange resins and develop boric acid using ion exchange chromatography to condense the boron isotopes. . Among them, styrene-based chelating anion exchange resins having aminopolyols as functional groups that exhibit high selectivity for boric acid have an isotope separation coefficient ( This resin is interesting because its α11 ) is higher than that of other ordinary strong and weak base anion exchange resins (French Patent No. 1j, 2θ!, No. 27). The resins are Diaion ■0RBO2 (manufactured and sold by Mitsubishi Chemical Industries, Ltd.) and Amberlite ERA7ri3 (manufactured and sold by Rohm E & Φ Haas Co., Ltd. in the United States, product name, former name: XE).
J&J).

However, these resins generally have a slow adsorption/desorption reaction rate of boric acid, and are also slow in boron isotope concentration, and have a low concentration of boron isotopes, iJIIiTP (Height Equ.
ivalent Of a Theoretical
Plate (used as a measure of isotope exchange reaction rate) was large, and for this reason, enrichment of boron isotopes using the anion exchange resin could not be said to be a particularly excellent method.

(However, %R5 is the isotope ratio of position L1 of the boron isotope enrichment zone.) The present inventor has determined that when concentrating boron isotopes using a specific anion exchange resin, the HETP and the It was discovered that there is a correlation between the rate of change in volume of ion exchange resins, and that anion exchange resins with a specific degree of swelling can be used efficiently for weaving boron isotopes, and the present invention was completed. did.

That is, the present invention involves passing boric acid through an ion exchange resin layer made of aminopolyol type anion exchange resin to form a boric acid adsorption band, and then passing an acid solution to concentrate boron isotopes. An anion exchange resin used for boron isotope @condensation, characterized in that the volume change rate expressed by the following formula [1] is r ~ 3θ, where vl: free amine form Volume of resin in water Vt: salt*a-layer mB'iIo-to-form s in water.

The anion exchange resin used in the present invention is produced by first forming a crosslinked polymer IJ having a halomethyl group, and then reacting this with a specific amine.

The crosslinked copolymer having a halomethyl group can be prepared by a known method, for example, by combining a monovinyl aromatic monomer such as styrene with a solvent such as benzene, toluene, xylene, chlorobenzene, carbon tetrachloride, tetrachloride, etc. A method of copolymerizing by adding chloroethane, trichlorethylene, etc. in an amount of about 0,000% by weight to the monomer, and reacting the resulting gel-like or porous copolymer with total chloromethyl methyl ether, or the above method The monomers are copolymerized into a cell tlA with an aromatic linear polymer such as polystyrene t1 of 0-1 based on the total amount of monomers.
After copolymerization with addition of about 0 weight coefficient, the linear polymer is extracted and removed with a t-solvent, and the obtained gel-like or porous copolymer is reacted with chloromethyl methyl ether, or the above-mentioned method. Polymerization is carried out by adding a solvent (precipitation solvent) such as n-pentane, 1-octane, n-hebutane, etc., which dissolves the monomer but does not dissolve the produced crosslinked copolymer, in an amount of θ to /20% to the total amount of monomers. The resulting gel-like or porous copolymer is then dihalomethylated by the method described above.

In addition to styrene, the monovinyl aromatic monomer used in the above method includes vinyltoluene, ethylstyrene,
Aromatic vinyl compounds such as vinylanisole and vinylnaphthalene are useful. In addition to divinylbenzene, useful polyvinyl aromatic monomers include divinylethylbenzene, divinyltoluene, divinylnaphthalene, divinylxylene, divinyl ether, ethylene glycol dimethacrylate, ethylene glycol diacrylate, and divinyl ketone polyallyl ether. The amount of gold used can range from 2 to 72% by weight based on the total monomers.

The copolymerization is carried out using a polymerization catalyst such as benzoyl peroxide, lauroyl peroxide, azobisisobutyronitrile, etc. of 0.0% for all monomers. The reaction is carried out by adding 10 wt. As the polymerization method, known methods such as suspension polymerization and bulk polymerization can be employed.

Halomethylation of aromatic crosslinked copolymers can be carried out using known methods, e.g., using distilled methyl methyl ether in the presence of a Friedel-Crafts catalyst such as zinc chloride at %-20-tO
It is carried out by heating to ℃. The amount of chloromethyl methyl ether can vary within a wide range based on the aromatic crosslinked copolymer 10077, but preferably ranges from 109 to 300 g.

In addition to the above-mentioned method, the aromatic cross-linked polymer having 10 methyl groups can be cross-linked copolymerized with a halomethylated aromatic monovinyl compound such as chloromethylstyrene and a polyvinyl compound such as divinylbenzene according to all the above-mentioned methods. It can also be manufactured by a method.

The specific amine to be reacted with the crosslinked copolymer having a halomethyl group has the following general formula [however, in 1 formula, % n
indicates an integer between / and g.

R is a hydrogen atom, an alkyl group with 7 carbon atoms, or 10H2+0H(OH)-)OH20H (in the formula, m is 0./
t-indicates an integer from 6 to 6).

Specifically, the above-mentioned specific amines include N-glucamine, N-galactamine, N-mannothymine, N-arabitelamine% N-methyl-glucamine, N-ethyl-
Mention may be made of glucamine, N-methyl-galactamine, N-ethyl-galactamine, N-methyl-mannosamine, N-ethyl-mannosamine, and diarapitylamine.

The reaction between the crosslinked polymer having a halomethyl group obtained by the above method and the above-mentioned specific amine is carried out under heating at a temperature of 20 to θθ°C for 2 to 20 hours in the presence of a suitable solvent. Examples of solvents include water, ether solvents such as dioxane, acetone, ketone filaments such as methyl ethyl ketone, chloroform, and dichloroethane.

Examples include halogenated hydrocarbon solvents such as chlorobenzene, aromatic hydrocarbon solvents such as benzene and toluene, and alcohol solvents such as methanol and ethanol. In addition, in order to accelerate the reaction, potassium iodide,
Sodium hydroxide etc. can be added.

Furthermore, examples of the anion exchange resin used in the present invention include aminopolyol-type anion exchange resins obtained by reacting phenols with amines of the above general formula [diameter] and then condensing them with aldehydes. can.

In this way, the aminopolyol type anion exchange resin VC of the present invention, which has a volume swelling degree of / to 30 and is represented by the above-mentioned formula [1], can be produced.

The aminopolyol type anion exchange resin of the present invention exhibits properties as a so-called chelating anion exchange resin due to the aminopolyol group.

As a method for concentrating boron isotopes using the anion exchange resin of the present invention obtained by the above method, generally, a boric acid solution is passed through a column packed with the anion exchange resin,
This is carried out by column chromatography in which boric acid is adsorbed onto the resin layer and then the boric acid adsorption zone is developed with an acid solution.◎ When forming the boric acid adsorption zone using the above anion exchange resin of the present invention The boric acid concentration is 00-2 to -2.0
This can be mentioned in the range of fatty acid (M)/A, and when the concentration is low, the separation coefficient is large, which is an advantage, but the disadvantage is that a large amount of acid bath liquid is involved in the development. If the daughterness is still low, the separation coefficient decreases, but there is an advantage that the amount of boric acid adsorbed to the resin increases.

Examples of the acid used for development include base plate% mrR. Also, the enemy's origrade used for this deployment is θ
, Ko~2. One range of OM/l can be mentioned. The higher the operating temperature for boron isotope separation, the higher the isotope exchange reaction rate, and the lower the pressure loss in the ion exchange column during the separation operation due to the lower solution viscosity. Therefore, the temperature is preferably in the range of aO to 100° C. due to the heat resistance of the resin used during long-term use.

The particle size of the anion exchange lft1 fat of the present invention is as follows.

It is determined by taking into consideration all factors such as the isotope exchange reaction rate in boron isotope separation, the rate of adsorption and desorption between boric acid and the acid used in the development during the development, and the pressure loss of the ion exchange tower packed with the resin. As the average particle diameter of the resin over the acid concentration and operating temperature range! A range of Q to 300 μm can be mentioned.

Furthermore, under the above conditions, the rate of development of the adsorption zone by the acid in the ion exchange tower filled with the resin is determined by taking into account the isotope exchange reaction rate of the resin and the total pressure loss of the ion exchange tower. However, if the developing speed is slow, the productivity of separation and concentration of boron isotopes will decrease, and if the developing speed is fast, the linear velocity of the developing solution will also be high.

The pressure loss in the ion exchange tower was too large.

The ion exchange tower that has been developed with acid! At the above boric acid concentration and operating temperature in the range a, the flow rate (TV) should be set at 0.0% to prevent the regeneration of N fat from occurring. j〜λOm
A range of /hr is desirable.

Next, we will explain the method for separating and concentrating boron isotopes using an ion exchange column filled with an anion exchange resin of the present invention.1 The separation and concentration method used in the present invention is as follows: Examples include the breakthrough method, (1) substitution expansion method, and (2) a method that combines the reverse breakthrough method and substitution expansion method.

■ Reverse breakthrough method (Bull, Ohem, B
oo, JPNj Vol. 3, No. 2, p. 1140) Seven examples of the method of the present invention using the inverse breakthrough method will be explained with reference to FIG. 1 to 01 in FIG. 1 are ion exchange towers filled with the anion exchange resin of the present invention described above. This tower internal temperature is the supply g! Lt-heating and jacketing the tower can be maintained constant by circulating hot water or by providing insulation. ■+1 to 6 are solution switching valves for supplying liquid to the tower, and v21 to v28 are solution switching valves for sorting the liquid discharged from the tower. A detector for monitoring wIa belting is shown.

First, each ion exchange tower from OK to 06 was regenerated with an alkaline solution such as sodium hydroxide or ammonium hydroxide, and then washed with demineralized water. A boric acid solution is fed to the resin until equilibrium is reached. After that, the boric acid adsorbed on the resin is developed with an acid solution from vll, and then the liquid is drained from v16. Continuing the development with acid, when the rear end interface of the boric acid adsorption zone has moved to the 02 tower, the acid supply is switched to t'' vII, and the C1 tower, which has become the acid adsorption type, is v
Regeneration is performed by supplying an alkaline solution from H and draining the liquid from Vll, and then completely supplying demineralized water from Vll.
Drain and wash from H and then.

A boric acid solution is supplied from vII, drained from Vtt, and an amount of boron #R1 that is in equilibrium is passed through the resin in the column. In this process of regeneration, water washing, and boric acid adsorption of the C1 tower, the rear end interface of the boric acid adsorption zone developed at the bottom is from the C1 tower to the C8
The process was carried out so that it was completed before the transfer to the tower, and when the rear end interface of #l @ the belt was transferred to the 01 tower, the acid was supplied t” Vts
Switch to b V*s't vu and drain f:V! of the development of the boric acid adsorption zone. Start from step 1 and continue developing the boric acid adsorption zone with acid. Here, the 02 column performs regeneration, water washing, and boric acid adsorption in the same manner as the 01 column. By repeating this method, 30 B was added to the rear interface of the boric acid adsorption zone.
is reduced. When the B concentration reaches a desired concentration, Ba shrinkage is produced by, for example, extracting the Be shrinkage interface from the waste pulp at the bottom of the ion exchange column.

■ Substitution expansion method (J, Am, Chem, Sac,
, Vol. 77, p. 4/2J) An example of detachment using the same ion-exchange resin and equipment as in the above-mentioned reverse breakthrough method is also explained with reference to FIG. 1. For example, after regenerating the ion exchange towers from OI to 06 with an alkaline solution such as sodium hydroxide, they are washed with demineralized water, connected in series from the 01 tower to 0si6, and boric acid solution is supplied from 7 ports, ■! Drain the liquid from step 3 and pass the boric acid solution through it until it reaches a completely equilibrium state. Next, the 01 tower is connected to the Os tower, and an acid solution is supplied from Vll to perform displacement development of the boric acid adsorption zone. When the rear end interface of the boric acid adsorption zone moves to the C1 column, the acid supply is switched from t-v11 to vll at the same time.
Switch to 6 and continue replacement expansion.

- The 01 tower, which has completed the general development, is regenerated by supplying an alkaline solution from Vtt and draining it from Vll, and then similarly washed with water to prepare for the first development.

The operations of regenerating the C column and washing with water are completed until the rear end interface of the boric acid adsorption zone is transferred to the C1 column. At the point when the rear end interface of the boric acid adsorption zone moves to the 03 column, the acid supply t-v
l! Switch to vlm, connect 01kfrt next to the C6 tower, and continue the replacement development by starting from the drain liquid tvi. During this time, the 02 tower is regenerated and washed with water. By repeating this process, B is concentrated at the front end interface of the sulfuric acid adsorption zone, B is concentrated at the rear end interface, and when each reaches the desired degree of shrinkage, for example, each interface is concentrated at the bottom of the ion exchange column. Boric acid is extracted from the boric acid feed pulp at the top of the ion exchange tower in an isotopic composition ratio corresponding to the amount of boric acid extracted as it passes through the waste pulp. f depending on the method of supplying the boric acid feed liquid as it passes through the pulp.
Production of iB and B i9 condensates and supply of Bλ feed boric acid are carried out.

■　A method that uses both the reverse breakthrough method and the acid exchange expansion method.

Seven examples of the method will be explained using FIG. 1 as well. For example, the ion exchange tower f* (R) from C, 06 is regenerated with an alkaline solution of IJ" If, then washed with demineralized water, the ion exchange column from 0ti6 to 04 is connected in series and the boric acid solution from %Vll is The boric acid solution is supplied and drained from Vtt, and the boric acid solution is passed through until a complete equilibrium state is reached.Similar to the reverse breakthrough method shown in the arrow, the boric acid adhering to the resin is While expanding v
Drain from 24. At this time, the boric acid solution is supplied to the C column from Vllll, drained from Vts, and the entire boric acid solution is passed through the C5 column until it is completely balanced. vtt to #t
Continue to supply and expand until the rear edge interface of the boric acid film is 0.
After moving to the snow tower, switch the acid supply from t"■ to v1!, and at the same time, after the 04 tower, connect all the O@ towers and drain the liquid from the VTS. While the rear end interface advances through the 02 tower, a boric acid solution is supplied from v16 to the C6 tower, and the boric acid solution is ridged from Vta to adsorb boric acid to the C6 tower. 01 became an adsorption type
The tower supplies alkaline solution from v, i and v2! Drain and reconstitute, then wash with demineralized water. Next, when the rear end interface of the enemy's boric acid adsorption and expansion of the rear end transitioned to the Qs tower, the acid supply was switched to kV+s, and after the O1l tower, the
6 towers are connected and the liquid is drained from Vwe to continue development, and at this time C
The I column adsorbs boric acid, and the C column performs regeneration and water washing. By repeating the operation in this way, B is concentrated at the &myo interface of the boric acid adsorption zone.

When 10B is concentrated to the target quality or near it, the boric acid adsorption zone is removed by t-acid, and the boric acid adsorption to the ion exchange tower in front of the ion exchange tower deployed in the series is stopped. From the exchange tower '6p tower series! Switching to the Tower series, I am in danger of doing the replacement expansion of ■. By repeating the column regeneration and water washing of the displacement expansion and expansion method of the boric acid adsorption zone, B# shrinkage further progresses at the rear end of the boric acid adsorption zone, and after switching to displacement expansion at the front end interface, ■B will come to the net to meet the concentration of B that has accumulated on the edge interface. After this, at appropriate intervals, for example, when the front and rear interfaces of the boric acid adsorption zone each pass through the drain valve at the bottom of the column, all of the B# shrinkage and B whirlpools are extracted in proportion to the number of moles extracted. A number of moles of raw material boric acid is fed from the boric acid solution supply valve at the top of the ion exchanger to a place in the boric acid adsorption zone that has the same isotopic composition as the raw material boric acid, and as it passes through the valve, the boric acid solution is The production of %10n and "Ba fine products and the supply of the raw material boric acid are carried out by the feeding method. This method is suitable for producing high g% Bi reduced products.

The reason why the anion exchange resin of the present invention is effective in separating and concentrating boron isotopes has not yet been clearly elucidated, but is thought to be as follows.

That is, in boron isotope enrichment using an aminopolyol type anion exchange resin, the volume change rate expressed by the above formula [1] increases, the flHETP value decreases, and the boric acid exchange reaction rate improves. 5. Even if the boric acid adsorption zone in boron isotope enrichment is shortened, the necessary number of stages can be secured for depletion, and furthermore, the movement speed of the boric acid adsorption zone is improved, so boron isotope concentration is extremely efficiently achieved. Separation can be performed. However, if a resin with a large volume change rate is used, it is necessary to ensure in advance that the volume change between the free amine type and the acid adsorption type of the resin used is large. If this volume change rate is too large, it will be necessary to make a large air barrier area on the upper interface of the S fat in the column, and if this area becomes large, the mixing of soaked liquid in this area will be large. If the separation efficiency of one column is small, a problem arises in that the efficiency is extremely reduced.

Therefore, in the isotope fractionation using an aminopolyol type anion exchange resin, the above points are taken into account and the volume change rate of the resin is 1 to 30.
It is believed that the single-boron isotope exchange reaction labyrinth is fast, efficient, and stable in separating boron isotopes.

The commercially available conversion rate is as low as 6, and furthermore, Diamond ion 0kIBO2 is
/demeshi, so the IVJJ regioexchange reaction rate is <,
It is not necessarily a good resin for boron isotope separation.

Next, detailed embodiments of the present invention will be explained with reference to examples, but the present invention is not limited to the following examples.

Example/ Anion exchange resin (acid adsorption capacity 2.9 tmeψ resin, water Body coefficient average particle diameter λoo microns, uniformity coefficient /, 2j, volume change rate?. Riwo free amine form was packed into 6 jacketed glass columns each with an inner diameter of 10711+ and a length of 100θ■, and this was used as a series. (Fig. 1). Constant temperature water at 6θ°C was passed through the jacket, and the column was maintained at t-to°C, and siboron isotopes were separated by the reverse breakthrough method. That is, first, the first column 2000 d of 0.6 M boric acid ice-water bath solution preheated to ≦O°0 was passed through at a flow rate of LV/m/hr, and the liquid was drained from the 6th column to adsorb boric acid onto the resin in the 4th column. .

Next, a 0,tNN hydrochloric acid aqueous solution preheated to 30°C is passed from the first column at a flow rate of LV/m/hr to develop the boric acid adsorbed on the resin, and the boric acid aqueous solution flows out from the sixth column. of! The boric acid concentration was analyzed and found to be O0♂3M/l. The boron isotope ratio of B/i 1 in this boric acid aqueous solution was measured using OH-! The analysis was carried out using a type solid mass spectrometer. At this time, the time required from the start to the end of development with θ, J N hydrochloric acid water bath was 70.2 hours, and the moving speed of the rear end interface of the boric acid adsorption zone was j j, 7 W.
It was hr.

From the above, the B concentration at the last end of the boric acid film deposited zone when the boric acid film deposited zone 1 is developed by the reverse breakthrough method is the same as that of the natural composition raw material boric acid that was first adsorbed on the resin. 1 for the medium B degree of 79°/j. It was found that B was concentrated at the rear end interface of the boric acid adsorption zone over a length of: z4t, r%, approximately 4tj.

The separation factor calculated from this is /, O/.

HITP was /4t, 4. For reference, some of the raw materials and physical properties are shown in Table 7 and Table 2 for comparison.
Shown in the table.

Comparative example/Gui) ion 0RB0.2 (average particle size 100 microns,
The free amine form with a volume change rate of 3% to homogeneity factor (/) was packed into the column of Example//, connected in series, and the boron diagonal was separated by the reverse breakthrough method.

That is, first, the first column was preheated to 30℃ and heated to 90,6N.
The aqueous hydrochloric acid solution f20001d was circulated at a flow rate of 'LV/m/hr, and the liquid was drained from the 6th column, and boric acid was adsorbed on the resin in the 6th column. Next, 066 preheated to 60°C from the first column
The aqueous N-hydrochloric acid solution is passed at a total flow rate of LV/m/hr to develop the boric acid adsorbed on the resin, and the aqueous boric acid solution flows out from the 6th column! The concentration of boric acid was analyzed and found to be θ, e J' M/L.

The time required for the column to develop at this time was 70.2 hours, and the interfacial movement rate at the rear end of the boric acid adsorption zone was! Ko, j
cm/hr.

Next, when the boron isotope ratio of the aqueous boric acid solution was measured, it was found that the B1111 degree at the end of the boric acid film adsorption zone was % Koda,/%, and over a length of approximately 4jtyn, B was in the boron adsorption zone. It was condensed at the trailing edge interface.

The separation factor calculated from this is /, O/go,
HK'rP was a 4t tower. The results are also listed in Table 2 for comparison.

1-octane as a solvent, and toluene as a swelling medium as the first
Polymerization was carried out in combinations as shown in the table. Next, this crosslinked copolymer was chloromethylated with chloromethyl methyl ether,
This has N-methyl-D-glucamine'fr as a functional group.
: anion exchange resin (average particle size 700 microns, uniformity coefficient /, da) was synthesized.

Table 1: Free amine forms of these resins were added to the jacketed glass column λ column used in Example 2, respectively. 0.3M boric acid solution was first adsorbed onto the resin in the same manner as in Example/, and then 0.4N hydrochloric acid solution was added at 6θ℃ at a flow rate of LM/m/m/m. The boric acid adsorbed on the resin is developed by passing the liquid through the resin for hours, and the boric acid aqueous solution that flows out is fractionated, and its isotope is analyzed to determine HI.
I won TP. Do you put the results first? It is shown together with the volume change rate of the resin used in the table.

As a comparative example, Amberlite RA with a volume change rate of 6.3
-74tJ 10 ~j Crush Omiah products and IO
HKTP was determined using mt for the boron isotope in the same manner as in all Examples. This is shown in the first two parts.

As is clear from Table 2, 7 minoboriol type anion exchange l! with a volume change rate t~30. This shows that the HITP of J fat is significantly different and smaller.

FIG. 2 shows the relationship between the rate of change in volume of 12g and H]l1TP.

[Brief explanation of the drawing]

FIG. 7 shows ion exchange 4ifII for carrying out the present invention.
It is a conceptual diagram showing an I tower, its piping, and pulp. Figure 2 shows the volume change rate and HlnT obtained in Example.
In the diagram showing the relationship with P, the vertical axis in 1C shows HBiTp, and the horizontal axis shows the volume change rate. 1+ O,: Valve ion exchange tower ■11~v16: Valve V21~v2. ; Pulp M, % = M6 : Detector / : Body aK conversion rate - uIiiiTPa @ Continuation of 1st page ■■ nt, c1.4 identification code // G 21 C7706 [Phase] Inventor Itoi Identification Office serial number 8204 -2G 100()I, Kamoshida-cho, Midori-ku, Yokohama City Mitsubishi Chemical Industries, Ltd. General Research Center

Claims (1)

[Claims] (1) Boric acid is passed through an ion exchange resin layer made of an aminopolyol type anion exchange resin to form a boric acid adsorption zone, and then an acid solution is passed through the anion exchange resin layer to be used when concentrating boron isotopes. An ion exchange resin comprising the following [1
% that the volume change rate expressed by E formula is r ~ 30
Anion exchange fat for enriching boron isotopes. However, vl: volume of free amine form ai in water v,:
Volume of salt adsorption type resin in water (2. In the ion exchange am for boron isotope condensation described in claim 1, the aminopolyol type anion exchange resin has the general formula [Ir] [However, , in the formula, n represents an integer from / to B, R is a hydrogen atom, Ai =; a number from / to an alkyl group or -OH
, Mo0H(OH)-) OH,OH (in the formula, m represents an integer from 01/ to Anion exchange resin for body concentration.