Axial backmixing and residence time distribution in a miniaturized, stirred-pulsed extraction column

Axial backmixing and residence time distribution in a miniaturized, stirred-pulsed extraction column
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小型搅拌脉冲萃取塔中的轴向返混和停留时间分布

DOI:
10.1002/ceat.201700152
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发表时间:
2018
影响因子:
2.1
通讯作者:
N. Kockmann
N. Kockmann
中科院分区:
工程技术4区
文献类型:
--
作者:
S. Soboll;L. Bittorf;N. Kockmann

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轴向返混对萃取塔的传质性能有很大影响,是萃取塔中的一个重要问题。以水/乙酸正丁酯为体系,研究了小型搅拌脉冲柱在连续相中的返混特性。采用电导法测定了氯化钾脉冲作用下的停留时间分布。为了在不扭曲两相流的情况下进行电导率测量,制作了与柱壁精确对准的环形设计的电极。这种设计是一种很有前途的替代方案,用于商业电极不适合的小规模管状装置,以及必须避免与流动干扰的应用。
Axial backmixing is an important issue in extraction columns since it heavily affects the mass transfer performance. A miniaturized, stirred‐pulsed column was investigated regarding its backmixing characteristics in the continuous phase, using the system water/n‐butyl acetate. Residence time distributions were determined through pulse experiments with potassium chloride, which was detected via electrical conductivity. To perform the conductivity measurement without distortion of the two‐phase flow, electrodes with an annular design that precisely line up with the inner column wall were manufactured. This design is a promising alternative for use in small‐scale tubular devices where commercial electrodes do not fit and in applications where interference with the flow must be avoided.
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