Vol 6, No 1 (2015) > Chemical Engineering >

Mean Drop Diameter in a Rotating Sieved Disc Contactor

Fatemeh Behzad, Hossein Bahmanyar, Hoda Molavi, Setareh Manafi


Abstract: A correlation has been proposed for mean drop diameter in a Rotating Sieved Disc Contactor (RSDC) considering drops break up, as well as drops coalescence with static holdup in the case of no mass transfer. The proposed correlation is a function of a number of stages, rotating speed in the form of Reynolds number, static hold-up and mother drop size. The effects of the last two terms have not been considered by other researchers. Therefore, the results are compared with two reported correlations to show how these two important terms influence the size of drops. Distilled water was used as a continuous phase and toluene was applied as a dispersed phase in the experiments. The absolute average relative error and standard deviation for the correlation were 14.74% and 10.08%, respectively.
Keywords: Hold-up; Mean drop diameter; Rotating sieved disc contactor

Full PDF Download


Al-Rahawi, A.M.I., 2007. New Predictive Correlations for the Drop Size in a Rotating Disc Contactor Liquid-Liquid Extraction Column, Chemical Engineering & Technology, Volume 30(2), pp. 184192

Chakra borty. Bhattacharya, M.C., Datt S., 2003. Effect of Drop Size Distribution on Mass Transfer Analysis of the Extraction of Nickel (II) by Emulsion Liquid Membrane, Physicochemical & Engineering Aspects, Volume 224, pp. 6574

Chang-Kakoti, D.K., Fei, W.Y., Godfrey. J.C., Slater, M.J., 1985. Drop Sizes and Distributions in Rotary Disc Contactors Used for Liquid-Liquid Extraction, Separation and Processing Technology, Volume 6(27), pp. 4048

Cruz-Pinto, J.J.C., Korchinsky, W.J., Al-Husseini, R., 1983. Mass Transfer to Non-uniform Dispersions in Countercurrent Flow Liquid-Liquid Extraction Columns, In Proceedings of ISEC 83, American Institute of Chemical Engineering, Denver, Conference, USA

Ibrahim, S.Y., Maloka, I.E., 2003. Physical Properties of Aqueous N-Methyl Pyrrolidone at Different Temperatures, Petroleum Science & Technology, Volume 22(1112), pp. 15711579

Kadam, B.D., Joshi, J.B., Koganti, S.B., Patil, R.N., 2009. Dispersed Phase Hold-up, Effective Interfacial Area and Sauter Mean Drop Diameter in Annular Centrifugal Extractors. Chemical Engineering Research & Design, Volume 87(10), pp.13791389

Kagan, S.Z., Aerov, M.E., Volkova, T.S., Trukhanov, V.G., 1964. Calculation of the Drop Diameter in Rotary Disc Extractors. Journal of Applied Chemistry. USSR (Engl. Transl.), Volume 37, pp. 6773

Kamath, M.S., Subba Rau, M.G., 1985. Prediction of Operating Range of Rotor Speeds for Rotary Disc Contactors, Canadian Journal of Chemical Engineering, Volume 63(4), 578584

Kirou, V.I., Tavlarides, L.L., Bonnet, J.C., 2004. Flooding, Holdup & Drop Size Measurement in Multistage Column Extractor, Tsouris, AIChE J. Volume 34(2), pp. 283292

Krishnaiah, M.M., Pai, M.U., Rao, M.V.R., Sastri, S.R.S., 1967. Performance of a Rotating Disk Contactor with Perforated Rotors. British Chemical Engineering, Volume 12, pp. 719721

Kumar, A., Hartland, S., 1996. Unified Correlations the Prediction of Drop Size in Liquid-Liquid Extraction Column. Industrial & Engineering Chemistry Research, Volume 35(8), pp. 26822695

Laddha, G.S., Degaleesan, T.E., 1976. Transport Phenomena in Liquid-Liquid Extraction, McGraw Hill Company, New York.

Molavi, H., Hoseinpoor, S., Bahmanyar, H., Shariaty-Niasar, M., 2011. Investigation on Local and Average Static Hold-ups in Liquid-Liquid Systems in a Rotary Disc Contactor. Canadian Journal of Chemical Engineering. Volume 89(6), pp. 14641472

Pratt, H.R.C., Stevens, G.H., 1992. Science and Practice of Liquid-Liquid Extraction, Clarendon Press, Oxford, U.K.

Reman, G.H., Olney, R.B., 1955. The Rotating Disc Contactor a New Tool for Liquid-Liquid Extraction, Chemical Engineering and Processing, Volume 51(3), pp. 141146

Simmons, L., Mark, J.H., Ziad Sohial, H., Azzopardi, B.J., 2000. Comparison of Laser-based Drop-size Measurement Techniques & Their Application to Dispersed Liquid-liquid Pipe Flow, Optical Engineering Journal, Volume 39(2), 505509

Soltanali, S., Ziaie-Shirkolaee, Y., 2007. Comparative Study on Experimental Correlation of Mean Drop Size in Liquid–liquid Extraction Columns. Asian Journal of Biochemical and Chemical Engineering, Volume 1, pp. 2325

Sprough, F.B., 1967. Hydrodynamic Behavior of Rotating Disc Contactor under Low Agitation Conditions, Chemical Engineering Science, Volume 22, pp. 435440

Treybal, R.E., 1963. Liquid Extraction. McGraw-Hill, New York

Wang, Y.D., Fei, W.Y., Sun, J.H., Wan, Y.K, 2002. Hydrodynamics and Mass Transfer Performance of a Modified Rotating Disc Contactor (MRDC), Chemical Engineering Research and Design, Volume 80(4), pp. 392400