N,N-二乙基十八酰胺萃取铀的研究

Study on extraction of U(Ⅵ) with N,N-diethyloctadecanamide in toluene

以甲苯为稀释剂研究了N,N－二乙基十八酰胺（DEODA）从硝酸介质中萃取铀的可行性。考察了水相酸度、萃取剂浓度对萃取平衡的影响，求得了萃取平衡常数。借助红外光谱确定了萃合物的组成和结构；考察了温度对萃取平衡的影响，得到了萃取化学反应的热力学常数。DEODA萃取体系不出现三相，是核燃料处理中有前途的一种萃取剂。

The extraction of U(Ⅵ) from nitric acid with N, N-diethyloctadecanamide (DEODA) in toluene has been studied. The effects of concentration of both aqueous phase nitric acid and DEODA as well as temperature on extraction distribution have been considered. The structure of the extracted species has also been confirmed by the FT-IR spectra. Extraction constant Kex at low nitric acid concentration and the thermodynaxnic constants of the extraction reaction are obtained. There is no third phase formation under the experimental conditions, which shows that DEODA is one of promising extractants in nuclear fuel reprocessing.