As a bifunctional ionic liquid used for the extraction of yttrium and heavy rare earth elements (REEs), [methyltrioctyl ammonium][(2,6-dimethylheptyl) phenoxy acetic acid] ([N1888][POAA]) has been synthesized in this paper. The extraction kinetics of REEs including La–Lu plus Y except Pm with [N1888][POAA] using a constant interfacial area cell were reported. Comparing with the conventional (2,6-dimethylheptyl) phenoxy acetic acid (HPOAA) extraction system, the forward extraction rate (kao, mm s?1) of heavy REEs in the [N1888][POAA] extraction system increased significantly with an improvement of 8.44 times for yttrium. The effect of stirring speed on the extraction rate of mixed REEs was studied and 300 rpm was suggested to ensure the extraction regimes were chemical reaction-controlled. The effect of temperature was studied and the extraction reaction was controlled by chemical reaction when the temperature was below 298 K. The effect of specific interfacial area was also evaluated which indicated that the bulk phase was the reaction zone. The average extraction rate equation of REEs has also been obtained as: ?d[RE](o)/dt = 0.141[RECl3]([N1888][POAA]).
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机译：作为用于萃取钇和重稀土元素（REE）的双功能离子液体，[甲基三辛基铵] [（2,6-二甲基庚基）苯氧基乙酸]（[N 1888 ] [POAA]）已被合成。报道了使用恒定界面面积池萃取除Pm和[N 1888 ] [POAA]之外的包括La-Lu加Y的REE的动力学。与常规（2,6-二甲基庚基）苯氧基乙酸（HPOAA）萃取系统相比，正萃取率（ k ao ，mm [N 1888 ] [POAA]提取系统中重REE的s ？1 ）随着钇改善了8.44倍。研究了搅拌速度对混合稀土元素萃取率的影响，并建议采用300 rpm的转速，以确保萃取机理是化学反应控制的。研究了温度的影响，当温度低于298 K时，通过化学反应控制萃取反应。还评估了比界面面积的影响，表明本体相是反应区。稀土元素的平均提取率方程也已获得：？d [RE] （o） / d t = 0.141 [RECl < small> 3 ]（[N 1888 ] [POAA]）。
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