Single stage separation factors a have been determined for "Li and 7 Li between lithium ions in methanol and complexed ions with a cryptand (2B, 2, 1) polymer. The 6 Li was concentrated in the cryptand. The separation factors were compared with the values of other chemical exchange systems. The maximum enrichment factor obtained was •=0.047±0.002. The figure is one of the greatest in the chemical exchange reactions without valence change and almost 10 times larger than the values of ion exchangers. The variation in a depending on the chemical species was small in the non-aqueous system. High enrichment of lithium isotopes was expected to be achievable by means of the chromatographic application of the cryptand (2B, 2, 1).
The lithium isotope separation in the liquid-liquid extraction system H 2 0/CHCI 3 is investigated using benzo-15-crown-5 as complexing agent. The maximum single stage separation factor trmax for 6 Li/"Li obtained in the present study was 1.044±0.003. For the chemical exchange reactions without valence change, this value is the second largest behind one ob• tained using cryptand (2B, 2, 1) polymer. The lithium salt was extracted into the organic phase with highly concentrated crown ether forming u+[crown] 2 complexes. The chemical and isotopic equilibria were attained rapidly. The separation factors were 1.026, 1.032 and 1.035 at 25•c for r-, SCN-and trifiuoroacetate (TFA) as counter anions, respectively. In regard to the separation factor, the distribution coefficient and the stability to the change of temperature, lithium iodide would be most suitable for the industrial application. The isotope effects in u+-crown complex are hindered by the hydration of the complex ion, but the abstraction can be avoided by using the organic solvent with highly concentrated crown ether.
The lithium isotope separation in the liquid-liquid extraction system H 2 0/CHCI 3 is investigated using benzo-15-crown-5 as complexing agent. The maximum single stage separation factor trmax for 6 Li/"Li obtained in the present study was 1.044±0.003. For the chemical exchange reactions without valence change, this value is the second largest behind one ob· tained using cryptand (2B, 2, 1) polymer. The lithium salt was extracted into the organic phase with highly concentrated crown ether forming u+[crown] 2 complexes. The chemical and isotopic equilibria were attained rapidly. The separation factors were 1.026, 1.032 and 1.035 at 25·c for r-, SCN-and trifiuoroacetate (TFA) as counter anions, respectively. In regard to the separation factor, the distribution coefficient and the stability to the change of temperature, lithium iodide would be most suitable for the industrial application. The isotope effects in u+-crown complex are hindered by the hydration of the complex ion, but the abstraction can be avoided by using the organic solvent with highly concentrated crown ether.
Single stage separation factors a have been determined for "Li and 7 Li between lithium ions in methanol and complexed ions with a cryptand (2B, 2, 1) polymer. The 6 Li was concentrated in the cryptand. The separation factors were compared with the values of other chemical exchange systems. The maximum enrichment factor obtained was •=0.047±0.002. The figure is one of the greatest in the chemical exchange reactions without valence change and almost 10 times larger than the values of ion exchangers. The variation in a depending on the chemical species was small in the non-aqueous system. High enrichment of lithium isotopes was expected to be achievable by means of the chromatographic application of the cryptand (2B, 2, 1).
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