Intensified Eu(III) extraction using ionic liquids in small channels
Intensified Eu(III) extraction using ionic liquids in small channels
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DOI：
10.1016/j.ces.2016.01.004
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发表时间：
2016-04-02
影响因子：
4.7
通讯作者：
Angeli, Panagiota
中科院分区：
文献类型：
--
作者：
Li, Qi;Angeli, Panagiota
以离子液体溶液(0.2M正辛基(苯基)-N，N-二异丁基氨基甲基氧膦(CMPO)-1.2M三丁基磷酸酯)(TBP)/1-丁基-3-甲基咪唑双[(三氟甲基)磺酰酰胺；([C(4)min][NTf2])为萃取相，在强化小型分离装置上研究了从硝酸溶液中萃取Eu(III)。研究是在直径为0.2 mm和0.5 mm的通道中进行的，以水溶液为分散相，研究导致推流的相流量。利用高速成像和亮场微粒子图像测速仪研究了塞状流的界面面积和塞状流内部的速度分布。结果表明，在硝酸浓度为1M时，分配系数和传质系数最大，与相同混合速度和相流量比的大通道相比，塞内回流和界面面积较大的小通道内的传质系数更高。在同一流道内，传质系数随停留时间的增加而减小，表明在流道入口两相接触处发生了显著的传质。将实验结果与以往的推流传质系数关联式进行了比较。(C)爱思唯尔有限公司出版的2016年。
The extraction of Eu(III) from nitric acid solutions was studied in intensified small scale separation units using an ionic liquid solution (0.2 M n-octyl(phenyl)-N,N-diisobutylcarbamoylmethyphosphine oxide (CMPO)-1.2 M Tributylphosphate) (TBP)/1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyll amide; ([C(4)min][NTf2])as the extraction phase. The investigations were carried out in channels with 0.2 mm and 0.5 mm diameter for phase flowrates that result in plug flow with the aqueous solution as the dispersed phase. The interfacial area in plug flow and the velocity profiles within the plugs were studied with high speed imaging and bright field micro Particle Image Velocimetry. Distribution and mass transfer coefficients were found to have maximum values at nitric acid concentration of 1 M. Mass transfer coefficients were higher in the small channel, where recirculation within the plugs and interfacial area are large, compared to the large channel for the same mixture velocities and phase flow rate ratio. Within the same channel, mass transfer coefficients decreased with increasing residence time indicating that significant mass transfer takes place at the channel inlet where the two phases come into contact. The experimental results were compared with previous correlations on mass transfer coefficients in plug flows. (C) 2016 Published by Elsevier Ltd.