| 摘要 |
<p>PCT No. PCT/FR93/01161 Sec. 371 Date May 17, 1995 Sec. 102(e) Date May 17, 1995 PCT Filed Nov. 25, 1993 PCT Pub. No. WO94/12502 PCT Pub. Date Jun. 9, 1994The invention relates to bis-crown calix[4]arenes, their preparation process and their use for the selective extraction of cesium and actinides. Bis-crown calix[4]arenes are in accordance with the formula: <IMAGE> (I) in which R1 and R2 respectively represent X(C2H4X)m and X(C2H4X)n with X=O, NH and/or N(CH3), m and n=3, 4, 5 or 6, or X (C2H4X)p/2XY(C2H4X)p/2 with p=2 or 4 and Y=cycloalkylene or arylene. These bis-crown calix[4]arenes, whose benzene nuclei are optionally substituted by alkyl groups, can be used as an extracant, e.g. in the form of a liquid membrane, for separating cesium from acid solutions containing sodium in a large quantity compared with the cesium quantity, e.g. effluents of irradiated fuel reprocessing plants.</p> |
