Industrial production method for separating boron isotope products based on methyl ether-boron trifluoride complex

Abstract

An industrial production method for separating boron isotope products based on a methyl ether-boron trifluoride complex belongs to the technical field of isotope separation. It is mainly invented to solve the problems of serious vacuum belting in the chemical reaction exchange distillation method of methyl ether-boron trifluoride complex. Firstly, the methyl ether-boron trifluoride complex is stripped and dried, and the methyl ether-boron trifluoride complex from the stripping column is continuously added to the first exchange distillation column, and continuously extracted The liquid in the tank of the previous exchange distillation column is added to the top of the next column, and the steam at the top of the latter column continuously enters the tank of the previous column after being condensed; under reduced pressure heating and rectification, the boron trifluoride gas And the methyl ether gas enters the shell side of the condenser and the trap, the coolant goes through the tube side of the condenser and the trap, and the -60°C methyl ether solution is pumped to the sprayer, and the boron trifluoride gas Spraying is performed to convert boron trifluoride gas and methyl ether gas into methyl ether-boron trifluoride complex. The advantage is that it can solve the problem of vacuum belting.

Description

Technical field: [0001] The invention belongs to the technical field of isotope separation, and in particular relates to an industrial production method for rectifying and separating boron isotope products based on the chemical exchange reaction of methyl ether-boron trifluoride complex. Background technique: [0002] Boron has two stable isotopes, boron-10 and boron-11, with natural abundances of 19-3% and 80.7%, respectively. Boron-10 has a very strong ability to absorb neutrons, and it is widely used in nuclear power, modern industry, military equipment and medicine. Boron-11 is a potential thermonuclear reaction material. Adding boron-11 to steel can greatly improve the performance of high temperature resistance and radiation resistance. At present, the high-abundance boron isotope products used in my country mainly rely on imports. There are three main methods for producing boron isotopes in the world: ether-boron trifluoride vacuum exchange distillation, methyl ether...

AI Technical Summary

Problems solved by technology

This separation method has disadvantages such as poor gas-liquid contact, long time to reach equilibrium, high pressure drop in the tower system, large system circulation, and high energy consumption. At the same time, it has problems such as low production capacity, low separation efficiency, and high separation cost.

[0006] The invention patent with Chinese patent number 200610013467.5 discloses a "method for separating boron-10 with three towers in series and single tower accumulative total reflux batch mining alternate operation", which uses three rectification towers with the same height and diameter in series Liquid storage tanks and other equipment carry out rectification, which relatively improves the separation efficiency, but the structure is complicated and the operation is troublesome

[0007] The invention patent with the Chinese patent number "200910010817.6" discloses a "different-diameter tower separation technology for boron-10 isotope", which uses three series-connected rectification towers with the same height and decreasing diameter to p-methyl ether-boron trifluoride The chemical exchange distillation of the complex directly changes the flow rate of the liquid phase and the gas phase, increasing the chance of the liquid phase and the gas phase in convective contact, but the operation is difficult, the production capacity is low, and the separation cost is high

In actual industrial installations, limited by the space at the top of the exchange distillation column and the concentration of reactants, boron trifluoride gas and methyl ether cannot be completely converted into methyl ether-boron trifluoride complexes, so part of the trifluoride Boron gas is taken out by the vacuum system, causing serious loss and waste

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