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本文测定了以4-叔丁基苯并-15-冠-5作络合剂的H_2O/C_6H_51双液萃取体系分离锂同位素的若干参数。发现大环多醚双液萃取锂盐体系的(α—1)对(1—p)有线性关系,α为同位素分离系数,p为有机相的锂/醚浓度比。从ΔG°(交换反应的自由能变化)和ε_p(p=100％时的富集系数)考察,有关体不分离锂同位素能力下降的次序为:穴醚(2,2,1)-CHCl_3/CF_3COOli-H_2O或穴醚(2,2,1)-树脂/LiI-甲醇,(4-叔丁基苯并-15-冠-5)-C_6H_5I/LiSCN-H_2O,(苯并-15-冠-5)-CHCl_3/LiI-H_2O。
In this paper, some parameters for the separation of lithium isotopes from H_2O / C_6H_51 double-liquid extraction system using 4-tert-butylbenzo-15-crown-5 as complexing agent were determined. It was found that there was a linear relationship between (α-1) and (1-p) in the macrocyclic polyether ether-liquid extraction lithium salt system, α was the isotope separation factor, and p was the lithium / ether concentration ratio of the organic phase. The order of non-separation of lithium isotopes from the order of ΔG ° (free energy change of exchange reaction) and ε_p (enrichment coefficient at p = 100%) is as follows: valencene (2,2,1) -CHCl 3 / (Benzo-15-crown-5) / LiSCN-H_2O, CF_3COOli-H_2O or Cryptand 2,2,2 - Resin / LiI- 5) -CHCl 3 / LiI-H 2 O.