RADIONUCLIDE EXTRACTION BY CROWN-ESTER CONTAINING EXTRACTANTS Russian patent published in 2008 - IPC G21F9/12 G21F9/04 B01D11/04 C07C31/38 C07C43/10 

FIELD: extracting radionuclides from acid solutions of highly radioactive waste in radiochemical industry and recovering spent extractant.

SUBSTANCE: mixture used for the purpose has polyfluorinated alcohol-telomer, 1,1,7-trihydrodedodekafluoroheptanol-1, its chemical formula being H(CF₂CF₂)_n CH₂OH, where n - 3, and polyoxyethylene glycol esters of primary synthetic aliphatic alcohols of fraction C₁₂-C₁₄ , general formula being C_nH_{2n + 1}O(C₂H₄O)_mH, where n = 12 - 15, m = 2, used as solvent of solutions incorporating macrocyclic compounds chosen from group include crown-esters with unsubstituted aromatic fragments; crown-esters having substituted aromatic fragments incorporating alkyl and/or hydroxyl alkyl substituents of linear and/or branched composition; crown-esters having unsubstituted cyclohexane fragments; crown-esters having substituted fragments incorporating alkyl and/or hydroxyl alkyl substituents of linear and/or branched composition; crown-ester having substituted fragments -O-CHR-CH₂O-, where R is normal or branched alkyl or hydroxyl alkyl. Invention also concerns alternatives of extractants for extracting highly active wastes of radiochemical industry and methods for extracting radionuclides and for recovering spent extractants.

EFFECT: facilitated procedure.

26 cl, 21 tbl