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W/O Pickering emulsion preparation using a batch rotor-stator mixer - Influence on rheology, drop size distribution and filtration behavior.
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-03-31 , DOI: 10.1016/j.jcis.2020.03.103
Maresa Vivien Kempin 1 , Matthias Kraume 2 , Anja Drews 1
Affiliation  

HYPOTHESIS Pickering emulsions (PE) are becoming of increasing interest for catalytic multiphase processes. Ultrafiltration of PE is a promising procedure for catalyst recovery to enable continuous processes. Dispersing conditions during production of PE are expected to significantly influence PE characteristics, and control of these properties is essential for robust process design. However, while the impact of PE composition has been studied before, knowledge on dispersing conditions is surprisingly scarce. EXPERIMENTS The influence of dispersing time, speed and emulsion volume during the preparation of PE with an UltraTurrax (2 dispersing tools) on the drop size distribution, rheology, stability and filtration was investigated. FINDINGS In this first systematic study of PE preparation conditions, obtained Sauter mean diameters were correlated with energy density (R2 = 0.80), energy dissipation rate (R2 = 0.85) and tip speed (R2 = 0.86). All emulsions were stable for at least 10 weeks. With increasing tip speed (4-13 m/s), the dynamic viscosity first decreased, passed through a plateau value and then increased again. Filtration of concentrated PE was successful but strong membrane-particle-solvent interactions were revealed. This work contributes to a better understanding of PE properties that are essential for a sound application of PE in continuous multiphase catalysis.

中文翻译:

使用间歇式转子-定子混合器进行W / O Pickering乳液制备-对流变性,液滴尺寸分布和过滤行为的影响。

假设皮克林乳液(PE)对于催化多相工艺越来越引起关注。PE的超滤是用于催化剂回收以实现连续过程的有前途的方法。预期在PE生产过程中的分散条件会显着影响PE特性,因此控制这些特性对于稳健的工艺设计至关重要。然而,尽管之前已经研究了PE组成的影响,但是令人惊讶地缺乏关于分散条件的知识。实验研究了用UltraTurrax(2种分散工具)制备PE期间分散时间,速度和乳液体积对液滴尺寸分布,流变性,稳定性和过滤的影响。结果在对PE制备条件进行的第一个系统研究中,获得的Sauter平均直径与能量密度(R2 = 0.80),能量耗散率(R2 = 0.85)和叶尖速度(R2 = 0.86)相关。所有乳液稳定至少10周。随着叶尖速度的增加(4-13 m / s),动态粘度首先降低,通过平稳值,然后再次增加。浓缩PE的过滤很成功,但显示出很强的膜-颗粒-溶剂相互作用。这项工作有助于更好地理解PE性能,这对于PE在连续多相催化中的合理应用至关重要。经过一个稳定值,然后又增加。浓缩PE的过滤是成功的,但显示出很强的膜-颗粒-溶剂相互作用。这项工作有助于更好地理解PE性能,这对于PE在连续多相催化中的合理应用至关重要。经过一个稳定值,然后又增加。浓缩PE的过滤是成功的,但显示出很强的膜-颗粒-溶剂相互作用。这项工作有助于更好地理解PE性能,这对于PE在连续多相催化中的合理应用至关重要。
更新日期:2020-03-31
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