The present work is performed to assess the hydrodynamic parameters and mass transfer coefficients in a PRDC column for the chemical reaction systems. By considering the selective extraction of molybdenum from tungsten, the extraction parameters and synergistic enhancement factor were interpreted at the batch experiments. In the column experiments, the impacts of operating conditions such as the agitation rate, inlet solvent phase velocity as well as inlet aqueous phase velocity were studied on the drop behavior, overall mass transfer coefficients, and extraction efficiencies. The modified correlations by using relationship of dimensionless numbers were illustrated to estimate the hydrodynamic factors (holdup value and the Sauter mean drop diameter) under the physical and reactive systems. The mass transfer coefficients for the continuous phase were evaluated by the axial diffusion method in both extraction and stripping stages. It was observed that the column performance was primarily affected by the agitation speed and mass transfer direction, but this phenomenon slightly changes with the inlet phase velocities. The previous empirical models were compared with the obtained mass transfer data, and the available models were failed to precisely anticipate the experimental data due to chemical reaction conditions. Finally, two new models based on the dimensionless numbers were derived for calculating the overall Sherwood number. The value of separation factor in the extractor indicated the column capacity with the excellent separation for molybdenum from tungsten in the sulfate solution.

进行本工作以评估PRDC色谱柱中用于化学反应系统的流体力学参数和传质系数。通过考虑从钨中选择性提取钼，在批处理实验中解释了提取参数和协同增强因子。在柱实验中，研究了搅拌速率，入口溶剂相速度以及入口水相速度等操作条件对液滴行为，总传质系数和萃取效率的影响。通过使用无量纲数的关系来说明修正的相关性，以估计物理和反应体系下的流体动力因子（持水量和Sauter平均液滴直径）。连续相的传质系数是通过轴向扩散法在萃取和汽提阶段进行评估的。可以看出，色谱柱的性能主要受搅拌速度和传质方向的影响，但是这种现象随入口相速度的变化而略有变化。将先前的经验模型与获得的传质数据进行了比较，并且由于化学反应条件的原因，可用的模型未能准确预测实验数据。最后，基于无量纲数得出了两个新模型，用于计算总舍伍德数。萃取器中分离因子的值表明了色谱柱的容量，其中硫酸盐溶液中的钨与钼的分离效果极佳。