Publication Date:
2014-06-05
Description:
Coalescence behavior in liquid-liquid dispersions is controlled by various parameters. Thus, data from different research groups can differ significantly. Dynamic coalescence processes were analyzed systematically with the EFCE standard test system toluene/water in two different research laboratories. After comparability was proven with standardized batch settling tests and drop rise velocity measurements, the influence of drop size ratio and varying NaCl and NaOH concentrations on coalescence probability was investigated. Since the ions led to a coalescence inhibition, no clear impact of drop size ratio could be observed. The analysis of drop contact showed longer contact times for increasing equivalent drop diameter. This promotes coalescence and corresponds to film drainage model. The coalescence behavior in liquid-liquid dispersions has been the object of research for decades but there are still some phenomena like the influence of ions that are by no means completely understood. Dynamic coalescence processes were analyzed systematically with the EFCE standard test system toluene/water and addition of NaCl and NaOH in two different research laboratories.
Print ISSN:
0930-7516
Electronic ISSN:
1521-4125
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
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