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Method for separating boron isotopes by using MOF-74(Zn) as simulated moving bed stationary phase

A simulated moving bed, MOF-74 technology, applied in the field of boron isotope separation, can solve the problem of low separation effect, achieve the effect of simple operation, high boron isotope separation factor, and cost reduction

Inactive Publication Date: 2017-12-01
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

Embodiment 1

[0018] The method for separating boron isotopes with MOF-74 (Zn) as a simulated moving bed stationary phase comprises the following steps:

[0019] (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;

[0020] (2) The simulated moving bed includes I-IV districts, and each district is composed of 3 chromatographic columns; MOF-74 (Zn) is used as the stationary phase of the simulated moving bed; the flow velocity in the I-IV districts is set to 300mL / min, and The port switching time is set to 10min, and the operating temperature is 25°C; the boric acid aqueous solution obtained in step (1) is continuously added to the chromatographic column of the simulated moving bed, and the hydrochloric acid aqueous solution obtained in step (1) is used for elution, and...

Embodiment 2

[0026] The method for separating boron isotopes with MOF-74 (Zn) as a simulated moving bed stationary phase comprises the following steps:

[0027] (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;

[0028] (2) The simulated moving bed includes zones I-IV, and each zone is composed of 7 chromatographic columns; MOF-74 (Zn) is used as the stationary phase of the simulated moving bed; the flow rate in zones I-IV is set to 1000mL / min, and The fixed port switching time is 70min, and the operating temperature is 10°C; the boric acid aqueous solution obtained in step (1) is continuously added to the chromatographic column of the simulated moving bed, and the hydrochloric acid aqueous solution obtained in step (1) is used for elution, and after the simulated moving bed reaches a...

Embodiment 3

[0034] The method for separating boron isotopes with MOF-74 (Zn) as a simulated moving bed stationary phase comprises the following steps:

[0035] (1) The aqueous solution of boric acid with a concentration of 25 g / L and the aqueous hydrochloric acid with a pH value of 6 are respectively filtered with a 0.45 μm filter membrane to remove impurities in the solution, and ultrasonic degassed for 15 minutes;

[0036] (2) The simulated moving bed includes I-IV districts, and each district is composed of 4 chromatographic columns; MOF-74 (Zn) is used as the stationary phase of the simulated moving bed; the flow velocity in the I-IV districts is set to 200mL / min, and The fixed port switching time is 20min, and the operating temperature is 40°C; the boric acid aqueous solution obtained in step (1) is continuously added to the chromatographic column of the simulated moving bed, and the hydrochloric acid aqueous solution obtained in step (1) is used for eluting. After the simulated movin...

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PUM

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Abstract

The invention discloses a method for separating boron isotopes by using MOF-74(Zn) as a simulated moving bed stationary phase. The method comprises the following steps: firstly, filtering a boric acid aqueous solution and a hydrochloric acid aqueous solution, then removing impurities and degassing; secondly, a simulated moving bed comprises I to IV areas, wherein 3 to 7 chromatographic columns are arranged in each area; taking the MOF-74(Zn) as the simulated moving bed in stationary phase; setting the flow rates of the I to IV areas, port switching time and operating temperature; continuously adding the boric acid aqueous solution into the chromatographic columns of the simulated moving bed, and eluting with the hydrochloric acid aqueous solution; after the simulated moving bed reaches the equilibrium state, collecting the boric acid aqueous solution enriched with isotope 11B at an extraction opening of the simulated moving bed and collecting the boric acid aqueous solution enriched with isotope 10B at the extraction opening of the simulated moving bed. The method disclosed by the invention is a method for continuously separating the boron isotopes and has the advantages of simple operation and relatively-high separation efficiency; in addition, the cost of concentrated isotope 10B can be effectively reduced and relatively-high boron isotope separation factors are obtained.

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): B01D59/22C01B35/10
CPCB01D59/22C01B35/109C01P2006/88
Inventor 郭翔海吕佳绯白鹏
Owner TIANJIN UNIV
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