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首页> 外文期刊>Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers >Applying forward mixing model in an L-shape pulsed packed extraction column to investigate the influence of drop size distribution on mass transfer
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Applying forward mixing model in an L-shape pulsed packed extraction column to investigate the influence of drop size distribution on mass transfer

机译：在L形脉冲填充萃取柱中施加前向混合模型，研究跌落尺寸分布对传质的影响

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The objective of this work is to model the effect of drop forward-mixing on the mass transfer efficiency of a two phase countercurrent extraction process. Based on the flow mechanism and drop size distribution in extraction columns, a novel model with a simplified sequential algorithm is developed. Unlike the other models that use mean diameter of the dispersed phase droplets, this model accurately considered the effect of drop size distribution on mass transfer efficiency. On the base of this model the volumetric overall mass transfer coefficient has been investigated in a pilot plant of L-shape pulsed packed extraction column by using two liquid systems of toluene/acetone/water and butyl acetate/acetone/water. It is found that, although the mass transfer coefficient related to the large droplets is larger but the corresponding volumetric overall mass transfer coefficient is less than that related to the small droplets. Therefore, any factor that reduces the drop size can improve the efficiency of mass transfer. Furthermore, the effect of operational variables and physical properties including the dispersed and continuous phases flow rates, pulsation intensity and interfacial tension have been considered on mass transfer coefficients. It has been found out that the pulsation intensity and the continuous phase flow rate have seriously affected on mass transfer coefficient, however, the dispersed phase flow rate has a weaker effect. Finally, new correlations are proposed to accurately predict the mass transfer coefficient, axial mixing and drop size distribution. Good agreement between predictions and experiments was found for all operating conditions that were investigated. (C) 2019 Published by Elsevier B.V. on behalf of Institution of Chemical Engineers.
机译：本作作品的目的是模拟下降搅拌对两相逆流提取过程的传质效率的影响。基于提取列中的流量机制和跌落尺寸分布，开发了一种简化顺序算法的新型模型。与使用分散相液滴的平均直径的其他模型不同，该模型准确地考虑了下降尺寸分布对传质效率的影响。在该模型的基础上，通过使用两个甲苯/丙酮/水和乙酸丁酯/丙酮/水的液体系统，研究了在L形脉冲填充萃取柱的先导厂中的体积总传质系数。结果发现，尽管与大液滴相关的质量传递系数较大，但相应的体积传质系数小于与小液滴相关的。因此，减少跌落尺寸的任何因素可以提高传质效率。此外，在传质中已经考虑了在传质中考虑了包括分散和连续相流量，脉动强度和界面张力的操作变量和物理性质的影响。已经发现，脉动强度和连续相流速对传质系数严重影响，然而，分散的相流速具有较弱的效果。最后，提出了新的相关性来精确地预测传质系数，轴向混合和滴尺寸分布。对预测和实验之间的所有调查的操作条件都有良好的一致性。 （c）2019年由Elsevier B.V发布。代表化学工程师机构。

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