Method for adsorbing and separating boron isotope by utilizing modified MCM-41 molecular sieve

A MCM-41, adsorption separation technology, applied in separation methods, separation of different isotopic elements, separation of dispersed particles, etc., can solve the problems of high price, unsuitable for large-scale industrial application, etc., and achieve extremely easy acquisition and high stability , good selective effect

Inactive Publication Date: 2014-08-13
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the resins currently on the market that can be used to separate boron isotopes in solutions are macroporous polystyrene resins, such as AmberliteIRA-743 in the United States, DOWEXBSR-1 in Germany, DianionCRB01 in Japan, XSC-700 in China and D564. Expensive, not suitable for large-scale industrial applications

Method used

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  • Method for adsorbing and separating boron isotope by utilizing modified MCM-41 molecular sieve
  • Method for adsorbing and separating boron isotope by utilizing modified MCM-41 molecular sieve
  • Method for adsorbing and separating boron isotope by utilizing modified MCM-41 molecular sieve

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Example 1 Adsorption and separation of boron isotopes using aminopropyl-modified MCM-41 molecular sieves

[0037] First, add 2.508g CTAB (cetyl ammonium bromide) to 48mL water to obtain a clear and transparent CTAB solution, then add a mixture of 48mL absolute ethanol and 15mL ammonia water to the CTAB solution, continue stirring for 15min, and then add Slowly add 4.7g TEOS (tetraethyl orthosilicate), and continue to stir for 3h until a white solid is formed, filter with suction, wash with 100mL distilled water and 100mL methanol for 2-3 times, and dry the filter cake in an oven at 105°C for 12h , and then calcined at 550°C for 5h, and cooled slowly to obtain white powder solid MCM-41.

[0038] Next, mix MCM-41 and triaminopropyltriethoxysilane at a mass ratio of 2:1, under the protection of nitrogen, use toluene as a solvent, and carry out reflux stirring in an oil bath; the temperature of the oil bath is 70°C , the time is 24h. The solution after the oil bath was co...

Embodiment 2

[0044] Example 2 Adsorption and separation of boron isotopes using N-methylglucose-modified MCM-41 molecular sieves

[0045] In this example, after the aminopropyl-modified MCM-41 molecular sieve was prepared with reference to Example 1, the aminopropyl-modified MCM-41 molecular sieve was further mixed and reacted with glucose in an equimolar ratio, and after cooling, Filter, wash and dry to obtain N-methylglucose modified MCM-41 molecular sieve.

[0046] The MCM-41 molecular sieve adsorbent modified by N-methylglucose is filled in an adsorption column with a diameter of 5 cm and a column length of 100 cm, and high-purity boric acid is dissolved in dichloromethane to obtain a boric acid solution with a concentration of 0.7 mol / L. Inject into the adsorption column and perform column elution. The temperature of column elution is 50°C, the adsorption time is 100h, and the flow rate of boric acid solution is controlled at about 3mL / min. If necessary, pressurized injection can be u...

Embodiment 3

[0051] Example 3 Adsorption and separation of boron isotopes using Schiff base-modified MCM-41 molecular sieves

[0052] In this example, after the aminopropyl-modified MCM-41 molecular sieve was prepared in reference to Example 1, the aminopropyl-modified MCM-41 molecular sieve was further mixed with the Schiff base in an equimolar mass ratio, and the 2 Add absolute ethanol under gas protection, add a small amount of glacial acetic acid dropwise, and carry out reflux and stirring in the oil bath; the temperature of the oil bath is 80°C, and the time is 24h. The solution after the oil bath was cooled to room temperature, filtered, and the filtered product was washed with ether-dichloromethane and dried to obtain an off-white powdery solid, that is, Schiff base-modified MCM-41 molecular sieve.

[0053] Fill the MCM-41 molecular sieve adsorbent modified by Schiff base in an adsorption column with a diameter of 10 cm and a column length of 150 cm, and use tetrahydrofuran to obtai...

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Abstract

The invention discloses a method for adsorbing and separating boron isotope by utilizing a modified MCM-41 molecular sieve. The method comprises the following steps: modifying an MCM-41 molecular sieve by adopting a compound with an end group containing an electron-deficiency functional group to obtain an MCM-41 molecular sieve adsorbent containing the electron-deficiency functional group; filling the MCM-41 molecular sieve adsorbent into an adsorption column; dissolving boric acid with water or an organic solvent to obtain a boric acid solution, injecting into the adsorption column for passing-through-column sprinkling; in the boric acid solution, combining 10B-enriched B(OH)<4-> with a tetrahedral structure, with the MCM-41 molecular sieve adsorbent containing the electron-deficiency functional group, and adsorbing into the adsorption column. 11B exists in B(OH)3 with a plane triangle structure and flows out from the adsorption column along with the boric acid solution, thus separating the boron isotope.

Description

technical field [0001] The invention relates to a method for separating boron isotopes, in particular to a method for adsorbing and separating boron isotopes by using modified MCM-41 molecular sieves. Background technique [0002] As early as 1992, since Kresge et al. first reported the synthesis of mesoporous molecular sieve MCM-41, due to its highly ordered and uniformly distributed hexagonal pore structure, the pore size range is wide (2-50nm), and the specific surface area is large. (>1000m 2 g -1 ) and good hydrothermal properties, mechanical stability and weak acidity, it has a wide range of application values ​​in the fields of macromolecular adsorption, separation and catalysis in petroleum and fine chemicals. [0003] Boron and boron compounds are widely used in light industry, metallurgy, machinery, chemical industry, electronics, medicine, national defense and other departments. 11 B and 10 B is two stable isotopes of boron, with natural abundances of 80.1%...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D59/26
Inventor 谢绍雷景燕贾永忠孙进贺姚颖马军
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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