Preparation and application of novel bitriamide organic compounds

Abstract

The invention belongs to the field of radioactive waste treatment and discloses CHON-element-containing amide organic compounds which can be applied to uranium [U(VI)] / thorium[Th(IV)] separation, plutonium[Pu(IV)] / uranium[U(VI)] separation, lanthanum[Ln(III)] / actinium[Ac(III)] separation and fission fragment element technetium [Tc(VII)] separation. The amide organic compounds have the advantages that the amide organic compounds are synthesized rapidly, simply and conveniently at multiple steps, target product yields are all 80-99%, and economy and high efficiency are achieved. The amide organic compounds contain symmetric bitriamide groups, comprise symmetric double-tripod structures and control extraction power for Th(IV) and U(VI) by changing lengths of carbon chains of bitriamide; immiscibility of the amide organic compounds with water is enhanced through regulating carbon chains of alkyl groups (R) on amide nitrogen atoms, so that the amide organic compounds are soluble in aromatic, alkyl and halogen-containing solvents, and are applied to a liquid-liquid extraction process; the amide organic compounds can be used for achieving Th(IV) / U(VI) separation under a high-acidity condition without three-phase forming, are capable of achieving Pu(IV) / U(VI) separation under the equal conditions because Th(IV) and Pu(IV) are similar in chemical properties, are also capable of achieving Ln(III)] / Ac(III) separation, and are high in Re(VII) distribution ratio.

Description

technical field [0001] The invention belongs to the field of radioactive waste treatment, relates to the preparation and application of novel symmetrical bistriamide organic compounds, is applicable to the separation of Th(IV) / U(VI) and Pu(IV) / U(VI), and is applicable to Ln( III) / Ac(III) separation and split element Tc(VII) separation. Background technique [0002] At present, facing the energy crisis and the bad trend of the ecological environment, several countries in the world are actively developing nuclear power projects, mainly using uranium as nuclear fuel, and the reprocessing of spent fuel is very difficult and challenging. At the same time, in order to increase the utilization rate of uranium, European and American countries are researching new nuclear reactors, that is, fourth-generation nuclear reactors, such as fast reactors, thorium reactors, and high-temperature gas-cooled reactors. Therefore, the development of power reactors and fourth-generation nuclear re...

AI Technical Summary

Problems solved by technology

But the extractant concentration is 0.01 mol.L -1 , the extraction system medium is 3 mol.L -1 HNO 3 Solution, with kerosene as diluent, D Th = 20 - 30, the concentration of the required extractant is too large, the distribution ratio is still low, and it cannot be better applied to the separation and purification of Th(IV)

Therefore, in order to overcome the disadvantages of poor stability of the extractant, great environmental pollution, not easy to be incinerated, and the three-phase problem in the liquid-liquid extraction process, a series of new symmetrical bistriamide extractants were designed and synthesized.

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