Method for separating boron-10 isotopic element using reducing tower

Abstract

The invention discloses a method for separating boron-10 isotopes by a reducing tower. Chemical exchange distillation is carried out on complex compound of boron triflouride by three rectifying towers which have the same height and progressively decreased diameters and are connected with each other in series; the operating condition of each rectifying tower is that the vacuum degree of the tower system is 20-200mmHg, the temperature at the top of the towers is 50-100DEG C, the temperature of a still is 60-120DEG C, the reflux ratio is 400-150:1. The rectifying towers with progressively decreased diameters directly change the flow of liquid phase and gas phase, effectively increase chances of convection contact between the liquid phase and the gas phase, increase the speed so that the system achieves balance in 72-75 hours, and increase the separation efficiency of products simultaneously, the abundance ratio of boron-10 in the final product is up to 90%. The invention has the advantages of simple structure, easy operation, rapid speed for achieving balance, high separation efficiency and little energy consumption.

Description

Technical field: [0001] The invention relates to a method for separating boron-10 isotopes, in particular to a method for separating boron-10 isotopes with a different-diameter tower with simple structure, easy operation, fast equilibrium speed, high separation efficiency and low energy consumption . Background technique: [0002] Boron-10 isotope has unique neutron protection properties, and has been widely used in nuclear power, nuclear medicine and nuclear military industry, especially as an indispensable control element for the reactor system of a new generation of nuclear power plants. At present, the boron-10 isotope is mainly obtained by chemical exchange distillation, that is, the boron trifluoride complex is injected into the rectification column, and heated and distilled under reduced pressure. At this time, the boron trifluoride The complex decomposes, and its steam flows from bottom to top, all condensed into liquid and re-formed the complex of boron trifluoride...

AI Technical Summary

Problems solved by technology

There are shortcomings such as too long time to reach equilibrium, too high pressure drop in the tower system, large system circulation, and high energy consumption, which lead to problems such as low production capacity, low separation efficiency and high separation cost.

In order to overcome the problems existing in the traditional method, the invention patent with the 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 and alternating operation", which adopts three with the same height and diameter The same rectification towers are connected in series and combined with liquid storage tanks and other equipment for rectification. Although the separation efficiency is relatively improved, the structure is relatively complicated, the operation is troublesome, and the obtained product concentration can only reach 85% at most.