Hydrodynamic Characterization of Mixer-Settlers in Extraction of Zirconium with TBP

Document Type: Research Note


1 Department of Chemical Engineering, Faculty of Engineering, University of Tehran, Tehran, I.R. IRAN

2 Chemistry Research Department, Nuclear Science Research School, Tehran, I.R. IRAN


An experimental study has been made of the hydrodynamics of a stage mixer-settler to obtain appropriate design information. In this paper several tests were done according to full factorial design of experiments with high reliability, since each test recurs seven times and the results of  them are very close to each other(P=1bar and T=25 °C). Sauter diameter in each test is determined with photographing of both mixer and settler and holdup quantity is measured by vacuum pump at the end of each test. In each test, dispersion height and dispersion length are determined by photographing of settler. Sauter diameter has been compared with Calderbank model and finally, a model has been suggested.


Main Subjects

[1] Abraham, D., Giraldo Zuniga, Jane S.R., Coimbra, Luis, A., Minim, Edwin, E., Garcia Rojas, Dispersed Phase Hold-Up in a Graesser Raining Bucket Contactor Using Aqueous Two-Phase Systems, Journal of Food Engineering ,72, 302 (2006).

[2] Stephan, A. Schmidt, Martin Simon, Menwer, M. Attarakih, Luis Lagar G., Hans Jorge Bart, Droplet Population Balance Modeling Hydrodynamics and Mass Transfer, Chemical Engineering Science, 61, 246 (2006).

[3] Abraham Damian Giraldo Zuniga, Jane S. Reis Coimbra, Luis A. Minim, Edwin E. Garcia Rojas, Axial Mixing in a Graesser Liquid-Liquid Contactor Using Aqueous Two-Phase Systems, Chemical Engineering and Processing, 44, 441 (2005).

[4] Schloman, Jr., Processing Guayule for Latex and Bulk Rubber, Industrial Crops and Products, 22, 41 (2005).

[5] Hans Jorg Bart, Extraction Columns in Hydro-metallurgy, Hydrometallurgy, 78, 21 (2005).

[6] Ruiz, M.C., Padilla, R., Analysis of Breakage Functions for Liquid-Liquid Dispersions, Hydrometallurgy, 72, 245 (2004).

[7] Ahmed, A. Abdeltawab, Susumu, Nii, Fumio Kawaizumi, Katsuroku Takahashi, Separation of La and Ce with PC-88A by Counter-Current, Mixer-Settler Extraction Column, Separation and Purification Technology, 26, 265 (2002).

[8] Gilberto, A. Pintoa, Fernando, O. Duraob, Antonio M.A. Fiu´zac, Margarida M.B.L. Guimaraesa, C.M. Novais Madureira, Design Optimization Study of Solvent Extraction: Chemical Reaction, Mass Transfer and Mixer-Settler Hydrodynamics, Hydro-metallurgy, 74, 131 (2004).

[9] Ruiz, M.C., Lermanda, P., Padilla, R., Drop Size Distribution in a Batch Mixer under Breakage Conditions, Hydrometallurgy, 63, 65 (2002).

[10] Steiner, L., Mass Transfer Rates From Single Drops and Drop Swarms, Chem. Eng. Sci., 41, (1986).

[11] Misek, T.,  Recommended  Systems  for  Liquid Extraction Studies, European Federation of Chemical Engineers, (1978).

[12] Elzinga, E.R., Banchero, J.T., Film Coefficients for Heat Transfer to Liquid Drops, Chem. Eng. Proces., 29, 149 (1959).

[13] Kumar, A., Hartland, S., Correlations for Prediction of Mass Transfer Coefficients in Single Drop Systems and Liquid-Liquid Extraction Columns, Trans I Chem. Eng., (1999).

[14] Skelland, A. H .P.,  Lee, J. M.,  Drop  Size  and Continuous Phase Mass Transfer in Agitated Vessels, AIChE , 27, 99 ( 1981).