Effect of diluents on the extraction of uranium(VI) using N-octanoylpiperidine

The extraction performance of uranium(VI) from nitric acid with N-octanoylp iperidine (OPPD) in series of diluents has been investigated. The dependenc e of extraction distribution on the concentrations of aqueous nitric acid a nd OPPD and also the temperature has been studied. The experimental results showed that the decreasing order of extraction ability of OPPD is as follo ws: benzene, dimethyl benzene (DMB), toluene, 1,2-dichloroethene, n-octane, carbon tetrachloride, cyclohexane, chloroform. It cannot be interpreted on ly on the basis of polarity of the diluents. The interaction between extrac tant or extracted species and diluent is discussed.