S. V. Demina, E. V. Fatyushinaa, V. I. Zhilovb, V. V. Yakshinb, O. M. Vilkovab,
N. A. Tsarenkob, and A. Yu. Tsivadzeb
a Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia
b Frumkin Institute of Physical Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991 Russia
Received June 28, 2007
Abstract—We study the extraction of strontium, cesium, and some other elements by dicyclohexano-18-
crown-6 (DCH18C6) and its di-tert-butyl derivative (DTBDCH18C6) in the system 1,1,7-trihydrododecafluo-
roheptanol-water from the solution modeling PUREX raffinate. We show that strontium under these conditions
is extracted in a single contact with distribution ratios of 100-200 and separates from sodium, whose distribu-
tion ratio is less than 0.01. Strontium extraction in a single contact reaches 99.5%. The stoichiometry and
stability constants are determined for nitric acid complexes of the crown ethers studied with coextraction of
nitric acid (1 : 1). The mutual solubilities of the components in the system 1,1,7-trihydrododecafluorohep-
tanol–water are calculated using chromatography/mass spectrometry: water in alcohol is 0.5 wt %, and alco-
hol in water is 0.16 wt %.
DOI: 10.1134/S0036023608070280
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