Among thermal separation methods, solvent extraction is one of the most energy-efficient processes. Basis for high separation efficiency is, besides thermodynamic properties, the high interfacial area; thus, good mixing and dispersion of the two liquid phases are beneficial. The miniaturized stirred-pulsed extraction column is a promising concept for extraction on a laboratory scale, since it combines counter-current flow with high separation performance.

In this contribution, a pulsation system has been investigated, particularly the influence of asymmetric pulsation patterns. It utilizes a rapid upward stroke for a system with a lighter dispersed phase combined with a slow return. The ratio between these stroke times and its influence on flooding, hold-up and separation performance has been investigated for a standard EFCE test system in an extraction measurement cell. The cell has an inner diameter of 15.8 mm and an active extraction height of 136 mm. The hydrodynamic parameters and the extraction performance have been investigated for various frequencies and time ratios of up to 27.57. The results show with more asymmetric pulsation patterns an increasing hold up of the dispersed phase with higher separation performance and thus its potential for process intensification with solvent extraction.

在热分离方法中，溶剂萃取是最节能的工艺之一。除了热力学性质外，高分离效率的基础是高界面面积；因此，两种液相的良好混合和分散是有益的。微型搅拌脉冲萃取柱是实验室规模萃取的一个很有前景的概念，因为它结合了逆流流动和高分离性能。

在这一贡献中，研究了脉动系统，特别是不对称脉动模式的影响。对于具有较轻分散相和缓慢返回的系统，它利用快速向上冲程。这些冲程时间之间的比率及其对溢流、滞留和分离性能的影响已针对萃取测量单元中的标准 EFCE 测试系统进行了研究。该池的内径为 15.8 毫米，有效提取高度为 136 毫米。已针对高达 27.57 的各种频率和时间比研究了流体动力学参数和提取性能。结果表明，随着更不对称的脉动模式，具有更高分离性能的分散相的滞留量增加，因此它具有通过溶剂萃取强化工艺的潜力。