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已经测定了不同条件下,用二(2-乙基己基)磷酸(DEHPA))煤油溶液从盐酸溶液中萃取镧系元素时,添加三辛基氧膦(TOPO)或吡啶的影响。用红外和核磁共振谱仪分析了有机萃合物。发现,在低酸度下,刑DEHPA萃取时,有TOPO存在,发生反协同效应,而在较高酸度条件下,萃取分配系数与TOPO的添加量无关。与此相反,吡啶的存在,在低酸度下,对萃取有协同效应,但是在较高酸度下,添加吡啶不影响萃取的分配系数。本文是在所得实验结果的基础上,讨论了用DEHPA萃取稀土元素时,添加TOPO的反协同效应,以及添加吡啶的协同效应。
The effect of addition of trioctylphosphine oxide (TOPO) or pyridine on extraction of lanthanides from hydrochloric acid solutions with kerosene di (2-ethylhexyl) phosphate (DEHPA) under different conditions has been determined. Organic extracts were analyzed by infrared and nuclear magnetic resonance spectroscopy. It was found that under low acidity, there was TOPO in the extraction of DEHPA, and the anti-synergistic effect occurred. Under higher acidity, the extraction partition coefficient was not related to the amount of TOPO added. In contrast, the presence of pyridine has a synergistic effect on extraction at low acidity, but at higher acidity, the addition of pyridine does not affect the partition coefficient of extraction. Based on the experimental results obtained, this paper discusses the counter-synergistic effect of adding TOPO and the synergistic effect of adding pyridine when extracting rare-earth elements with DEHPA.