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首页> 外文期刊>Journal of chromatography, A: Including electrophoresis and other separation methods >Visualization of Type-J counter current chromatography: Hydrodynamic behavior in a helical column
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Visualization of Type-J counter current chromatography: Hydrodynamic behavior in a helical column

机译：j计数器电流色谱的可视化：螺旋柱中的流体动力学行为

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In counter-current chromatography (CCC), the hydrodynamic motion of a two-phase solvent system in the column/coil is very important. There are some previous visualization studies on CCC using stroboscopic photography. As CCC separation is a continuous liquid-liquid extraction process, observing the distribution and movement of the solvent system on-line will be helpful to understand the hydrodynamic behavior during the whole CCC separation process. In the present study, a high-speed imaging camera was employed to take videos of a running CCC bobbin (visualized continuously on-line). The dynamic motion and phase distribution of conventional quaternary solvent system hexane/ethyl acetate/methanol/water (HEMWat) and ternary solvent system dichloromethane/methanol/water were both investigated. Wavelike mixing was observed in the area where the centrifugal force is minimum in different diameter columns. When the coil rotated, the mixing zone was "fixed" at the minimum centrifugal force position. Several photographs of the rotating coiled tube were taken which revealed that the phase dispersion hardly changes once equilibrium is established. Finally, the sample dispersion process was also recorded. These results will help us to understand the separation process in a CCC column/coil and also present some more interesting questions related to separation efficiency which are shown in discussion part of this paper. (C) 2019 Published by Elsevier B.V.
机译：在逆流色谱（CCC）中，柱/线圈中两相溶剂系统的流体动力学运动非常重要。使用频闪摄影有一些先前的可视化研究。随着CCC分离是连续液体萃取过程，观察溶剂系统在线的分布和运动将有助于了解整个CCC分离过程中的流体动力学行为。在本研究中，采用高速成像相机拍摄运行CCC线轴的视频（连续在线可视化）。常规季型溶剂系统己烷/乙酸乙酯/甲醇/水（萱草）和三元溶剂体系二氯甲烷/水的动态运动和相分布均研究。在不同直径柱中的离心力最小的区域中观察到波状混合。当线圈旋转时，混合区在最小离心力位置处“固定”。拍摄旋转卷绕管的几张照片，揭示了一旦建立平衡，相位分散几乎没有变化。最后，还记录了样品分散过程。这些结果将有助于我们了解CCC柱/线圈中的分离过程，并且还提供了与分离效率相关的一些有趣的问题，这些问题在本文的讨论部分中显示。 （c）2019年由elestvier b.v发布。

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