Thermodynamic Properties of Solutions of Di-(2-ethylhexyl)phosphoric Acid-Lanthanum (Lutetium) Di-(2-ethylhexyl)phosphate-o-Xylene

被引：1
|
作者：
Kaplina, M. D. [1 ]
Potashnikov, A. A. [1 ]
Kurdakova, S. V. [1 ]
Kovalenko, N. A. [1 ]
Uspenskaya, I. A. [1 ]
机构：
[1] Lomonosov Moscow State Univ, Moscow, Russia
来源：
RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A | 2022年 / 96卷 / 12期
关键词：
density; saturated vapor pressure; di-(2-ethylhexyl)phosphate; lanthanum; lutetium; di-(2-ethylhexyl)phosphoric acid; o-xylene; Redlich-Kister model; UNIQUAC model; PHOSPHORIC-ACID; ACTIVITY-COEFFICIENTS; RARE-EARTHS; EXTRACTANT; GADOLINIUM; COMPLEXES; MIXTURES; SAMARIUM; EUROPIUM; POLARITY;
D O I：
10.1134/S0036024422120159
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In the present work, complexes formed by the rare earth elements (La, Lu) and di-(2-ethylhexyl)phosphoric acid were synthesized and identified. The densities of D2EHPA-lanthanum (lutetium) di-(2-ethylhexyl)phosphate-o-xylene solutions forming an organic phase in the lanthanide extraction processes were measured; the volumetric properties of D2EHPA-di-(2-ethylhexyl)phosphate REE-o-xylene systems were described using the Redlich-Kister polynomial model. The data on the saturated vapor pressure over D2EHPA-lanthanum (lutetium) di-(2-ethylhexyl)phosphate-o-xylene solutions are obtained at temperatures of 298.15, 303.15, and 308.15 K. The temperature-concentration dependencies of the activity coefficients of o-xylene in the investigated ternary systems were described with the UNIQUAC thermodynamic model taking into account the formation of D2EHPA dimers in solution.
引用
收藏
页码：2680 / 2686
页数：7
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