Micro-Contactor for Extraction and Permeation

本项目的目标是在非分散微结构逆流装置中对不同的反应性传质测试系统进行实验和理论研究。在那里，可以用很小的样品体积进行动力学实验，以便在明确定义的约束(即几何、流体力学)下量化扩散和/或反应的有限传质阻力。建立了微型接触器后，对前期标准化EFCE测试系统(锌/二(2-乙基己基)磷酸)的流体力学极限进行了评估，并对反应传质进行了模拟。所建立的方法将用于湿法冶金中有价值的金属锗和制药中手性测试物质扁桃酸这两种模型物质的验证。这将在反应萃取和液膜渗透(LMP)中进行，在这些过程中，反应传质现象仍然没有被完全理解和预测。微结构尺寸允许轻松实施在线传感器(例如，共聚焦拉曼显微镜)，以非侵入性在线分析萃取动力学。微通道可以通过产生局部浓度分布的自动机械移位装置在所有三个维度的范围内进行筛选。此外，该方法还可以获得定量和化学结构信息(在有机和水体系中)。与锌相比，这两种溶质具有截然不同的特性(分别增加了反应和扩散的影响)，并在使用这一新开发的方法时作为回收其他溶质的基础。在早期工艺设计阶段，将使潜在用户能够判断工艺的可操作性和技术(将使用LMP或提取)。连续测试的结果可作为快速、安全设计(微接触器、非分散操作)的基础，计数可在最小风险的情况下实现更高的吞吐量(例如，不需要使用LMP进行危险的高压乳化液分离)。

The objective of this project is an experimental and theoretical investigation of different reactive mass transfer test systems in a nondispersive, microstructured counter-current apparatus. There it is possible to perform kinetic experiments with very small sample volumes in order to quantify diffusion and/or reaction limited mass transfer resistances under well-defined constraints (i.e. geometry, hydrodynamics). After construction of the micro-contactor, an evaluation of the hydrodynamic limits and modeling the reactive mass transfer for standardized EFCE test system (zinc/di-(2- ethylhexyl)phosphoric acid) in the previous period was performed. The developed methodology will be validated for the two model substances like germanium, as a valuable metal in hydrometallurgy, and mandelic acid, as chiral test substance in pharmacy. This will be done for reactive extraction and liquid-membrane-permeation (LMP), where reactive mass transfer phenomena are still not fully understood and predictable. The micro-structured dimensions allow an easy implementation of on-line sensors (e.g. confocal Raman-microscopy) for a non-invasive online-analysis of the extraction kinetics. The microchannel can be screened in ¿m range in all three dimensions by an automated mechanical shift unit producing local concentration profiles. Additionally, this method yields quantitative and as well as chemical structure information (in organic, as well as in aqueous systems). Both solutes have diametrical characteristics compared to zinc (increasing impact of reaction and diffusion respectively) and serve as a basis for recovery of other solutes when using this new developed methodological approach. A potential user will be enabled in an early process design stage to judge process operability and technology (LMP or extraction to be used). The results of the continuous tests serve as basis for fast and safe design (microcontactor, non-dispersive operation) and numbering-up allows higher throughputs at minimum risk (e.g. risky high-voltage emulsion splitting with LMP is not necessary).