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Time evolution of the drop size distribution for liquid–liquid dispersion in an agitated tank

Radek Šulc, Bohuš Kysela, and Pavel Ditl

Czech Technical University in Prague, Prague, Czech Republic



Abstract: Agitating two immiscible liquids or a solid–liquid suspension is an operation frequently performed in the chemical and metallurgical industries, for example, in suspension/emulsion polymerization, heterogeneous/phase-transfer catalytic chemical reactions, and hydrometallurgical solvent extraction. For emulsification, suspension polymerization, solid particle dispersion, and crystallization, it is essential to be able to predict the mean drop/particle size and the drop/particle size distribution. A simple model was proposed for predicting the time evolution of drop size distribution during drop breaking, and was successfully tested on data published by Ruiz and Padilla (Hydrometallurgy 72:245–258, 2004) and by Sathyagal et al. (Chem Eng Sci 51: 1377–1391, 1996) and on our own data. The time evolution of DSD was investigated in a baffled tank agitated by a Rushton turbine for a liquid–liquid dispersion. The tests were carried out on a silicone oil–water dispersion (oil in water) with a dispersed-phase fraction of 0.00047. The drop sizes were determined by image analysis.

Keywords: Liquid–liquid dispersion ; Drop breakup ; Drop size distribution ; Time evolution 

Full paper is available at

DOI: 10.1007/s11696-017-0327-0


Chemical Papers 72 (3) 543–553 (2018)

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