Studies on mass transfer of europium(III) in micro-channels using a micro Laser Induced Fluorescence technique
Studies on mass transfer of europium(III) in micro-channels using a micro Laser Induced Fluorescence technique
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DOI：
10.1016/j.cej.2019.04.084
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发表时间：
2019-09-15
影响因子：
15.1
通讯作者：
Weheliye, Weheliye Hashi
中科院分区：
文献类型：
--
作者：
Angeli, Panagiota;Tsaoulidis, Dimitrios;Weheliye, Weheliye Hashi
采用新型微激光诱导荧光（micro-LIF）技术，在石英微通道（内径200 μ m）中研究了铕（III）从水相到有机相的传质。将铕（III）从IM硝酸溶液萃取到TBP（1.2M）/CMPO（0.2M）在Exxsol D80中的有机溶液中。对于所研究的流速，建立活塞流。一个实验和数据处理的方法来计算浓度分布从荧光强度分布在两个阶段在不同的位置沿着的微通道。特别地，考虑了有机相的高光强度对水相中的测量的影响。传质被认为是显着的，在通道的开始接近入口（1毫米的距离）与提取百分比之间变化的20和40%，这取决于总流速。在较短的停留时间（前6 s）内实现了较高的萃取效率（接近80%），而总体积传质系数在0.05和3.3 s（-1）之间变化。
The mass transfer of europium(III) from an aqueous to an organic phase was studied in a quartz microchannel (internal diameter of 200 mu m) using a novel micro Laser Induced Fluorescence (micro-LIF) technique. Europium (III) was extracted from a 1 M nitric acid solution into an organic solution of TBP(1.2 M)/CMPO(0.2 M) in Exxsol D80. For the flow rates investigated plug flow was established. An experimental and data processing methodology was developed to calculate concentration profiles from the fluorescing light intensity profiles in both phases at different locations along the microchannel. In particular, the effect that the high light intensity of the organic phase has on the measurements in the aqueous phase was taken into account. Mass transfer was found to be significant in the beginning of the channel close to the inlet (1 mm distance) with extraction percentages varying between 20 and 40% depending on the total flow rate. High extraction efficiency (similar to 80%) was achieved at short residence times (in the first 6 s), while the overall volumetric mass transfer coefficients varied between 0.05 and 3.3 s(-1).