Abstract
The extraction of uranium (VI) from a 1 M HClO 4NaClO 4 aqueous phase with chloroform solutions of five phosphoric acid esters, HDXP, was investigated, where X represents phenyl, p-tolyl, benzyl, p-chlorophenyl and β-naphthyl substituent. The data demonstrate the presence of the complex UO 2A 2(HA) 2 in the organic phase. Two alternative reactions describing the extraction process are given and their overall equilibrium constants K 3 and K 5 calculated. With the aid of the data obtained an empirical equation was derived correlating log K 5 with the acid dissociation, distribution and dimerization constants of the reagent in question. This equation enables one to predict the extraction ability of any phosphoric acid ester if its characteristic constants are known. The results show further that high acid dissociation and distribution constant as well as low dimerization constant are favourable factors when preparing new phosphoric acid esters exhibiting good extraction properties.
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