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Development of advanced reprocessing system using precipitants with high selectivity and control ability; Precipitation ability of N-butyl-2-pyrrolidone and N-propyl-2-pyrrolidone

Harada, Masayuki*; Morita, Yasuji  ; Nogami, Masanobu*; Nishimura, Kenji*; Ikeda, Yasuhisa*

In the present study, we have examined the precipitation ability of N-butyl-2-pyrrolidone (NBP) and N-propyl-2-pyrrolidone (NProP) as selective precipitants for uranyl ion, which have lower hydrophobicity than N-cycrohexyl-2-pyrrolidone (NCP) we had studied previously. As a result, we found that NBP and NProP can precipitate uranyl ions stoichiometrically regardless of the concentrations of uranyl ion and nitric acid, and the temperature of solutions. Furthermore, in the Pu concentration range of 0.04 to 0.06 M, Pu(IV) and Pu(VI) species were not precipitated by NProP, while Pu(IV) species are precipitated with addition of excess amount of NBP. From these results, it is expected that in the first precipitation process we can precipitate uranyl ions without coprecipitation of Pu(IV) species by using NBP or NProP.

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