Abstract: A process for extracting cesium ions from an aqueous solution, comprising:(a) producing, in a polar organic solvent, an adduct compound which is the product of (i) a macrocyclic polyether containing at least one species of the structural elements ##STR1## where, in structure I, n represents one of the numbers 0, 1 or 2, the --C-- (C).sub.n --O group forms part of the polyether ring and R.sub.1 is H, CH.sub.3, or phenyl, with up to 4 R.sub.1 not being H; in structure II, the --C--C--O-- group forms part of the polyether ring and R.sub.2 is H, CH.sub.3, t-butyl, pentyl, heptyl, nonyl, (CH.sub.2).sub.9 CH.sub.3, or phenyl, with up to 2 R.sub.2 not being H; and in structure III, the --C--C--O group forms part of the polyether ring and R.sub.3 is H, CH.sub.3, t-butyl, pentyl, heptyl, nonyl, (CH.sub.2).sub.9 CH.sub.3, or phenyl, with up to 2 R.sub.

Abstract: A process for the extraction of cesium ions from an aqueous solution with an adduct compound in solid form containing a macrocyclical polyether and an inorganic heteropoly acid. The adduct compounds employed comprise an adduct of (a) benzo-15-crown-5 (B-15-C-5); dibenzo-21-crown-7 (DB-21-C-7); or dibenzo-30-crown-10 (DB-30-C-10), with (b) 12-molybdophosphoric acid (HPMo); 12-tungstophosphoric acid (HPW); 12-molybdosilicic acid (HSiMo); 12-tungstosilicic acid (HSiW); or an Na, K, Tl, or NH.sub.4 salt of any of these acids.

Abstract: A process for the extraction of cesium ions from an aqueous solution with an adduct compound containing a macrocyclical polyether and an inorganic heteropoly acid component. An organic phase in the form of a solution of an adduct compound in a polar organic solvent is prepared. The adduct compound is the product of a crown ether containing at least one species of the structural elements ##STR1## where, in structure I, n represents one of the numbers 0, 1 or 2, the --C--(C).sub.n --O group forms part of the polyether ring and R.sub.1 is H,CH.sub.3, phenyl up to 4 R.sub.1 (.noteq.H); in structure II, the --C--C--O-- group forms part of the polyether ring and R.sub.2 is H,CH.sub.3, t-butyl, pentyl, heptyl, nonyl, (CH.sub.2).sub.9 Ch.sub.3, phenyl up to 2 R.sub.2 (.noteq.H);and in structure III, the --C.dbd.C--O group forms part of the polyether ring and R.sub.3 is H,CH.sub.3, t-butyl, pentyl, heptyl, nonyl, (CH.sub.2).sub.9 CH.sub.9, phenyl up to 2 R.sub.3 (.noteq.