Umetani S, Maeda K, Kihara S, Matsui M
Institute for Chemical Research, Kyoto University, Uji, Kyoto 611, Japan.
Talanta. 1987 Sep;34(9):779-82. doi: 10.1016/0039-9140(87)80095-4.
The synergic solvent extraction of lithium and sodium into benzene or cyclohexane with 4-benzoyl or 4-perfluoroacyl-5-pyrazolone and trioctylphosphine oxide (TOPO) has been investigated. Quantitative extraction (>99%) of lithium, which is one of the most poorly extractable metal ions, can be achieved with 1-tolyl-3-methyl-4-perfluoroacyl-5-pyrazolone and TOPO. The extraction of sodium is somewhat poorer than that of lithium under the same conditions. The perfluoroacyl group at the 4-position of the pyrazolone ring enhances the extraction and increases the maximum percentage extracted. Cyclohexane is found to be suitable for a quantitative extraction as an organic phase when the reagents are soluble in it. Improved separation of lithium and sodium can be attained when they are extracted into benzene.
研究了用4-苯甲酰基或4-全氟酰基-5-吡唑啉酮与三辛基氧化膦（TOPO）将锂和钠协同溶剂萃取到苯或环己烷中的情况。锂是最难萃取的金属离子之一，使用1-甲苯基-3-甲基-4-全氟酰基-5-吡唑啉酮和TOPO可实现锂的定量萃取（>99%）。在相同条件下，钠的萃取效果比锂稍差。吡唑啉酮环4位的全氟酰基增强了萃取效果并提高了最大萃取百分比。当试剂可溶于环己烷时，发现环己烷作为有机相适合进行定量萃取。当锂和钠被萃取到苯中时，可以实现更好的锂钠分离。
