The Support Loading Effect on Extraction-Chromatography Separation of Ytterbium and Lutetium Using 2-Ethylhexylphosphonic Acid Mono-2-Ethylhexyl Ester Based Sorbent

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The effect of the extractant content on the efficiency of ytterbium and lutetium separation from nitric acid solutions was studied for a sorbent made by impregnating Prefilter resin with 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester. It is shown that the distribution coefficients of Yb and Lu and their retention coefficients in the column increase as the extractant content increases. At the nitric acid concentration of 1.5 M, the effective separation of Yb and Lu is provided by the sorbent containing at least 40 wt % extractant. When separating equal amounts of Yb and Lu (0.5 mg each) in a column with 10 cm3 of sorbent at an elution rate of 1 mL/min and a temperature of 50°C, the yield of lutetium in the purified fraction exceeds 85%, providing Yb relative content in the Lu fraction less than 0.14% (1 atom of Yb per 700 atoms of Lu).

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Sobre autores

K. Bobrovskaya

Kapitsa Research Institute of Technology, Ulyanovsk State University

Email: rostislavkuznetsov@yandex.ru
Rússia, Universitetskaya nab. 1, korp. 4, Ulyanovsk, 432000

R. Kuznetsov

Kapitsa Research Institute of Technology, Ulyanovsk State University

Autor responsável pela correspondência
Email: rostislavkuznetsov@yandex.ru
Rússia, Universitetskaya nab. 1, korp. 4, Ulyanovsk, 432000

M. Lisova

Kapitsa Research Institute of Technology, Ulyanovsk State University

Email: rostislavkuznetsov@yandex.ru
Rússia, Universitetskaya nab. 1, korp. 4, Ulyanovsk, 432000

A. Fomin

Kapitsa Research Institute of Technology, Ulyanovsk State University

Email: rostislavkuznetsov@yandex.ru
Rússia, Universitetskaya nab. 1, korp. 4, Ulyanovsk, 432000

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2. Fig. 1. Dependence of k' Yb and Lu on nitric acid concentration at extractant contents of 20 (♦), 30 (■), 40 (▲), and 50 ().

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3. Fig. 2. Dependence of Dw and k' of Yb and Lu on the extractant content in the resin at nitric acid concentrations of 0.5 (♦), 0.65 (■), 0.8 (▲), and 1 mol/L ( ).

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4. Fig. 3. Yb (○) and Lu (□) yield curves on LN2P sorbent at 25С and extractant content of 30 (a), 40 (b), and 50% (c) and at 50С and extractant content of 30 (d), 40 (e), and 50% (f). The dotted line indicates the boundaries of the zones.

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5. Fig. 4. Peak width of the Lu output curve (a) and width of the mixing zone of the Yb and Lu output curves (b) as a function of the extractant fraction in the sorbent at 25 ( ) and 50С (■).

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