Vol 7, No 1 (2016) > Chemical Engineering >

Local Static Hold-up in a Rotary Sieved Disc Contactor for a Butyl Acetate-water System

Fatemeh Behzad, Hossein Bahmanyar, Seyed Mohammad Ali Mousavian, Hoda Molavi, Fatemeh Fogh

 

Abstract: Considering the importance
of liquid static holdup in liquid-liquid extraction columns, a novel
experimental approach for predicting the mentioned parameter in a rotary sieved
disc contactor has is presented in this research. One chemical system without
mass transfer was used, in which distilled water and butyl acetate were employed
as the continuous and the dispersed phase, respectively. The static holdup has
been measured using the draining method. Based on the experimental results, one
correlation was proposed to predict the static holdup as a function of stage
position in the column and rotating speed in the form of Reynolds numbers and
also the dimensionless mother drop size. Changes in static holdup caused by each factor have been discussed and
graphically illustrated. It was
revealed that an increase in mother drop size will cause the growth of static
holdup, while the rise of rotating speed will decrease the amount of static
holdup. Furthermore, it was proven that static holdups in upper positions in
the column are less than those in the lower positions.
Keywords: Hold-up; Mother drop size; Rotary Sieved Disc Contactor; Static hold-up

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References


Attarakih, M.M., Bart, H.J., Lagar, L.G., Fagir, N.M., 2006. A Windows-based Program for Hydrodynamics Simulation of Liquid-liquid Extraction Columns. Chem. Eng. Process, Volume 45, pp. 113–123

Behzad, F., Bahmanyar, H., Molavi, H., Manafi, S., 2015. Mean Drop Diameter in a Rotating Sieved Disc Contactor. Int. J. Tech., Volume 6, pp. 31–43

Kamath, M.S., Subba Rau, M.G., 1985. Prediction of Operating Range of Rotor Speeds for Rotary Disc Contactors. Can. J. Chem. Eng., Volume 63, pp. 578–584

Kasatkin, A.G., Kagon, S.Z., Trukhanov, V.G., 1962. The Hydrodynamic Characteristics of Rotary Disc Extractors. J. Appl. Chem., Volume 35, pp. 1903

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

Kulkarni, A.A., Gorasia, A.K., Ranade, V.V., 2007. Hydrodynamics and Liquid Phase Residence Time Distribution in Mesh Microreactor. Chem. Eng. Sci., Volume 62, pp. 7484–7493

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

Moris, M.A, Diez, F.V., Coca, J., 1997. Hydrodynamics of a Rotary Disc Contactor. Separation and Purification Technology, Volume 11, pp. 79–92

Molavi, H., Hossinpoor, S., Bahmanyar, H., Shariati-Niasar, M., 2010. Investigation on Local Static Hold-up in Liquid–liquid Systems in a Rotary Disc Contactor. Can. J. Chem. Eng., Volume 63, pp. 578–584

Molavi, H., Hoseinpour, S., Bahmanyar, H., 2011. Investigation on Local and Average Static Hold-ups in Liquid-Liquid Systems in a Rotary Disc Contactor. Can. J. Chem. Eng., Volume 89(6), pp. 1464–1472

Napeida, M., Haghighi Asl, A., Safdari, J., Torab-Mostaedi, M., 2009. Holdup and Characteristic Velocity in a Hanson Mixer-settler Extraction Column. Chem. Eng. Res. Des., Volume 88, pp. 703–711

Reman, G.H., Olney, R.B., 1955.00 The Rotating Disc Contactor a New Tool for Liquid-liquid Extraction. Chem. Eng. Prog., Volume 51, pp. 141–146

Schmidt, S.A., Simon, M., Attarakih, M.M., Larger, L.G., Bart, H.J., 2006. Droplet Population Balance Modelling—hydrodynamics and Mass Transfer. Chem. Eng. Sci., Volume 61, pp. 246–256.

Soltanali, S., 2007. Investigation of Hydrodynamic Parameters in RSDC Columns. M.S. Thesis, Tehran University, Iran

Slater, M.J., Goldfrey, J.C., 1994. Liquid-Liquid Extraction Equipment. New York: John Wiley and Sons. Inc.

Treybal, R.E, 1963. Liquid Extraction. New York: McGraw Hill Pub. Co.

Westerterp, K.R., Van Swaaij, W.P.M., Beenackers, A.A.C.M., 1984. Chemical Reactor Design and Operation. New York: Wiley

Yin, F., Afacan, A., Nandakumar, K., Chuang, K.T., 2002. Liquid Holdup Distribution in Packed Columns: Gamma Ray Tomography and CFD Simulation. Chem. Eng. Process, Volume 41, pp. 473-483

Zhang, S.H., Ni, X.D., Su, Y.F., 1981. Axial Mixing and Mass Transfer in Rotary Disc Contactors. Can. J. Chem. Eng., Volume 59, pp. 573–583