Investigation of the Effects of Impeller Speed and Holdup on Mean Drops Size in Mixer Settler with and without Surfactants
Advancing the chemical engineering fundamentals
Interfacial & Colloidal Phenomena - I (T2-6a)
Keywords: drop size, surfactant, impeller speed, holdup, mixer settler
Khacpai. A*, Abolghasemi. H, Ghannadi. M
The University of Tehran, Chemical Engineering Department, P.O Box 11365/4563, Tehran, I.R. Iran
Phone: 98 912 4436145, Fax; 98 182 4652600; contact e-mail: Amir.khacpai@gmail.com
An experimental investigation has been carried out in order to analyze the effects of impeller speed and holdup in a mixer settler extractor with and without surfactants. Experiments are performed in a single stage mixer settler with spiral impeller for two kinds of surfactants (anionic and cationic) are studied. Results showed that when system do not contain surfactant, mean drops size depends on impeller speed with a power law function with an exponent of -1.208 that that this numbers very close to -1.2 that derived from Hinze and Kolmogorov theory and this theory well proved. Mean drops size depends on holdup with an increasing linear function. However, when surfactant added in the liquid-liquid dispersion, decreasing rate of mean drops size decreases in increasing impeller speed, moreover increasing rate of mean drops size decreased in increasing holdup.
Presented Wednesday 19, 16:40 to 17:00, in session Interfacial & Colloidal Phenomena - I (T2-6a).
