Method and system for simultaneously producing high-concentration boron-10 boron trifluoride and high-concentration boron-11 boron trifluoride

Abstract

The invention discloses a method and a system for simultaneously producing high-concentration boron-10 boron trifluoride and high-concentration boron-11 boron trifluoride. With a small amount of commercially available bottled boron trifluoride as a material and a boron trifluoride / nitromethane or ether compound as a boron isotopes exchange working system, by cold-heat reflux at a concentration station and an extraction station in a cascade device, the boron trifluoride and a complex produced by the nitromethane or ether compound absorbing the boron trifluoride undego boron isotopes exchange, realizing the circulating reflux separation of boron-10 and boron-11. The system has a compact structure, is easy to operate, can be easily continuously automated, and not only greatly reduces the dosage of the boron trifluoride material, but also solves the problem of waste boron trifluoride discharge, moreover, energy consumption is reduced by about 80 percent, energy saving and zero discharge are realized, the production cost is greatly reduced, and the concentrations of the obtained boron-10 and boron-11 products are higher than or equal to 99 atom percent.

Description

Technical field: [0001] The invention relates to the technical field of stable isotope boron-10 and boron-11 production, in particular to a method and system for simultaneously producing high-concentration boron-10 boron trifluoride and high-concentration boron-11 boron trifluoride. Background technique: [0002] The boron element in all boron-containing substances in nature is composed of two stable isotopes boron-10 and boron-11, and their natural content (called natural abundance) is 19.8atom% and 80.2atom% respectively. Boron is relatively abundant in nature, but it is a worldwide problem to successfully separate the isotopes boron-10 and boron-11 from boron. Boron-10 has a strong ability to absorb neutrons, and the thermal neutron reaction cross section σ(n,α) is 3838 targets, while the natural boron neutron absorption cross section σ a There are only 750 targets, and the neutron absorption capacity of boron-10 is 20 times that of lead, 500 times that of concrete, and ...

AI Technical Summary

Problems solved by technology

[0003] The existing technology of industrialized production of boron isotope is the isotope exchange technology of boron trifluoride / anisole working system, but because the energy consumption of the existing process is relatively large (the energy is mainly consumed at the top of the exchange tower to generate heat for taking away the complex operation and the operation of supplying complex decomposition heat at the bottom of the exchange tower); in addition, due to the low extraction rate of the raw material boron trifluoride, not only the raw material consumption is large but also the boron-11 isotope content in the tail gas boron trifluoride is much lower It is discharged as waste, and these shortcomings lead to an increase in product costs

For other boron trifluoride / ether and ketone compound system isotope exchange technologies, due to the small separation coefficient or incomplete thermal decomposition of complexes, the operating temperature of the exchange tower must be raised to the boiling point of the solution to form isotope exchange distillation. , thereby reducing the separation coefficient, so it is not suitable for industrial production

The boron isotope separation technology that has been studied is BF 3 / SO 2 ﹒ BF 3 Low temperature exchange system and BF 3 Low-temperature rectification, etc., have not achieved industrial production

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