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Method for separating boron isotopes by using metal-organic framework material as stationary phase of simulated moving bed

A technology for simulating moving bed and organic framework, which is applied in the field of boron isotope separation, can solve the problem of low separation effect, and achieve the effect of simple operation, high boron isotope separation factor and cost reduction

Inactive Publication Date: 2017-08-08
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

in boric acid aqueous solution 10 B and 11 B separation effect is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0016] Preparation of ZIF-8, ref.: Park, K.S.; Ni, Z.; Cote, A.P.; Choi, J.Y.; Huang, R.; UribeRomo, F.J.; Natl. Acad. Sci. U.S.A. 2006, 103, 10186.

[0017] Preparation of UiO-66, reference: Cavka, J.H.; Jakobsen, S.; Olsbye, U.; Guillou, N.; Lamberti, C.; 13850.

[0018] Preparation of UiO-66-MM, reference: Jasuja,H.; Zang,J.; Sholl,D.S.; Walton,K.S.J.Phys.Chem.C 2012,116,23526.

[0019] UiO-66-NH 2 and the preparation of UiO-66-Br, reference: Garibay, S.J.and S.M.Cohen, Isoreticular synthesis and modification of frameworks with the UiO-66topology.Chem Commun (Camb), 2010.46(41):p.7700-2.

[0020] Preparation of MIL-53(Cr), reference: Coudert, F.; Boutin, A.; Fuchs, A.H.; Neimark, A.J.Phys.Chem.Lett.2013,4,3198.

[0021] Preparation of MIL-100(Cr), reference: Kusgens, P.; Rose, M.; Senkovska, I.; Froede, H.; Henschel, A.; Siegle, S.; Kaskel, S. Microporous Mesoporous Mater.2009 ,120,325.

[0022] Preparation of MIL-101(Cr), reference: Ferey, G.; Mellot-Draznieks, C.; S...

Embodiment 1

[0047] The method for separating boron isotopes with a metal-organic framework material as a simulated moving bed stationary phase comprises the following steps:

[0048] (1) The aqueous solution of boric acid with a concentration of 3g / L and the aqueous solution of hydrochloric acid with a pH value of 3 are filtered with a filter membrane with a pore size of 0.45 μm to remove impurities in the solution, and ultrasonically degassed for 15 minutes;

[0049] (2) The simulated moving bed is divided into I-IV zones, each zone is composed of 3 chromatographic columns; the metal-organic framework material MIL-101 (Cr) is used as the simulated moving bed stationary phase; the flow velocity in the I-IV zone is set as 300mL / min, set the port switching time to 10min, and the operating temperature to 25°C; continuously add the boric acid aqueous solution obtained in step (1) to the chromatographic column of the simulated moving bed, elute with the hydrochloric acid aqueous solution obtain...

Embodiment 2

[0054] The method for separating boron isotopes with a metal-organic framework material as a simulated moving bed stationary phase comprises the following steps:

[0055] (1) The aqueous solution of boric acid with a concentration of 50 g / L and the aqueous hydrochloric acid with a pH value of 1 are respectively filtered with a 0.45 μm filter membrane to remove impurities in the solution, and ultrasonic degassed for 10 minutes;

[0056] (2) The simulated moving bed is divided into I-IV zones, each zone is composed of 7 chromatographic columns; the metal-organic framework material MIL-100 (Fe) is used as the simulated moving bed stationary phase; the flow velocity in the I-IV zone is set as 1000mL / min, set the port switching time to 70min, and the operating temperature to 10°C; continuously add the boric acid aqueous solution obtained in step (1) to the chromatographic column of the simulated moving bed, elute with the hydrochloric acid aqueous solution obtained in step (1), and ...

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Abstract

The invention discloses a method for separating boron isotopes by using a metal-organic framework material as a stationary phase of a simulated moving bed. The method comprises the steps of (1) respectively filtering aqueous solution of boric acid and aqueous solution of hydrochloric acid by a filter membrane, removing impurities and carrying out ultrasonic degassing; (2) dividing the simulated moving bed into I to IV regions, enabling each region formed by 3 to 7 chromatographic columns, using the metal-organic framework material as the stationary phase of the simulated moving bed, setting flow rates of the I to IV regions, port switching time and an operating temperature, continuously adding the aqueous solution of boric acid into the chromatographic columns of the simulated moving bed, carrying out elution by the aqueous solution of hydrochloric acid, and after the simulated moving bed reaches a balanced state, collecting aqueous solution of boric acid, which is enriched in an isotope 11B, at an extraction port of the simulated moving bed and collecting aqueous solution of boric acid, which is enriched in an isotope 10B, at an extraction raffinate port. The method is simple to operate and has higher separation efficiency; cost of concentrating the isotope 10B can be effectively reduced; the method has a high boron isotope separation factor, and the enrichment degree of the isotope 10B obtained by separation reaches 97.92% or more.

Description

technical field [0001] The invention relates to a method for separating boron isotopes, in particular to a method for separating boron isotopes by using a metal-organic framework material as a simulated moving bed stationary phase. Background technique [0002] Boron has two stable isotopes 10 B and 11 B, whose natural abundances are 19.9% ​​and 80.1%, respectively. because 10 The thermal neutron capture cross-sectional area of ​​B is much larger than 11 B and natural boron, thus high abundance of 10 B is widely used in the nuclear industry, mainly as reactor control rods and thermal neutron shielding materials, and secondly in medicine 10 B can also be used to treat glioma and melanoma. [0003] In order to get enriched from natural boron 10 B, people have done a lot of research work, the current boron isotope separation process mainly includes: chemical exchange distillation, boron trifluoride cryogenic distillation, laser separation and chromatography. Among them,...

Claims

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Application Information

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IPC IPC(8): B01D59/26C01B35/02
Inventor 郭翔海吕佳绯白鹏
Owner TIANJIN UNIV
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