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Mass transfer investigation in a horizontal-vertical pulsed packed extraction column

机译：水平垂直脉冲填料提取塔中的传质调查

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In this study, hydrodynamic parameters and the mass transfer coefficient were investigated in a pilot version of a horizontal-vertical pulsed packed extraction column using a toluene-acetone-water system. The effects of the operational parameters on the volumetric overall mass transfer coefficient and hydrodynamic parameters away from the flooding point were studied, and it was found that the volumetric overall mass transfer coefficient, mean drop size and disperse phase holdup were significantly affected by the pulse intensity. However, the dispersed and continuous phase flow rates have a weaker effect. On the other hand, by increasing the pulse intensity the mean drop size and volumetric overall mass transfer coefficient were reduced and increased, respectively, in both sections of the column, but the disperse phase holdup displayed different behavior in the horizontal and vertical sections. By increasing the pulse intensity, the disperse phase holdup was first reduced and then increased in the horizontal section; however, an incremental trend was observed in the vertical section. The effect of the dispersed phase flow rate was significant for all the investigated parameters, but weaker. For instance, all the investigated parameters were increased by enhancing the dispersed phase flow rate. In contrast, the continuous phase flow rate has sometimes had no significant effect, for example, on the mean drop size in both sections of the column. Finally, two empirical correlations for the prediction of the volumetric overall mass transfer coefficient based on the continuous phase were derived in terms of the Sherwood number, Reynolds number and other dimensionless numbers. Good agreement between predictions and experiments was found for all operating conditions that were investigated.
机译：在这项研究中，水动力参数和传质系数在使用甲苯 - 丙酮 - 水系统中的水平 - 垂直脉冲填料萃取柱的试验版本进行了调查。所述体积总传质系数和动力学参数从泛点远离的操作参数的影响进行了研究，并且发现，该体积总传质系数，平均液滴尺寸和分散相滞留量分别显著受脉冲强度。然而，分散和连续相流速有较弱影响。在另一方面，通过增加脉冲强度的平均液滴尺寸和体积总传质系数被减少和增加的，分别在该柱的两个部分，但分散相滞留在水平和垂直部分中显示不同的行为。通过增加脉冲强度，分散相滞留量首先被还原，然后在水平部增加;然而，在垂直截面中观察到的增量的趋势。分散相流速的影响对所有研究的参数显著，但弱。例如，所有研究的参数分别增加了提高分散相流速。与此相反，连续相的流速，有时没有效果显著，例如，在列的两个部分的平均液滴尺寸。最后，用于基于所述连续相的体积总传质系数的预测两个经验相关性在舍伍德数，雷诺数和其他无量纲参数换算而得。预测和实验之间良好的一致性被发现的进行了调查，所有的工作条件。

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