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Received June 26, 2008
Accepted December 17, 2008
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Reduction of concentration polarization at feeding interphase of a hollow fiber supported liquid membrane by using periodic operation
Prakorn Ramakul†
Natchanun Leepipatpiboon1
Chamaiporn Yamoum
Uthen Thubsuang
Sirapop Bunnak
Ura Pancharoen2
Department of Chemical Engineering, Faculty of Engineering and Industrial Technology Silpakorn University, Nakhon Pathom 73000, Thailand 1Department of Chemistry, Faculty of Science, Chulalongkorn University, Patumwan, Bangkok 10330, Thailand 2Department of Chemical Engineering Faculty of Engineering, Chulalongkorn University Patumwun, Bangkok 10330, Thailand
korn_mass_transfer@hotmail.com
Korean Journal of Chemical Engineering, May 2009, 26(3), 765-769(5), 10.1007/s11814-009-0128-4
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Abstract
An experimental investigation was carried out to reduce the concentration polarization at feeding interphase between feed solution and liquid membrane imposing flow instabilities. The periodic operation of the hollow fiber supported liquid membrane for separation of lanthanide metal by using D2EHPA as extractant dissolved in kerosene. The operating flow rate of the feed solution was varied according to a symmetric square wave function around time-average values of 200, 300 and 400 ml/min. Time periods ranging from 18 to 3 minutes and amplitudes of 50 and 100 ml/min were investigated. The results of these periodic tests were compared with results obtained from the conventional steadystate mode of operation. It has been found that the periodic operation leads to higher stripping concentration or higher ion flux than that obtained from the corresponding steady state operating conditions. This is because periodic operation disturbs concentration polarization in the boundary layer between the feed solution and liquid membrane. It has also been found that the ion flux increases with increasing amplitudes and decreasing time periods of the forcing function. However, when the period is less than 3 minutes the flux decreases because the liquid membrane is peeled out from the pores of hollow fiber.
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References
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Marchese J, Campderros M, Acosta A, J. Chem. Technol. Biotechnol., 64(3), 293 (1995)
Moreno C, Hrdlicka A, Valiente M, J. Membr. Sci., 81, 121 (1993)
Loiacono O, Drioli E, Molinari R, J. of Membr. Sci., 28, 123 (1986)
Rautenbach R, Albrecht R, Membrane processes, John Wiley & Sons, Ltd (1989)
Ramakul P, Prapasawad T, Pancharoen U, Pattaveekongka W, J. Chin. Inst. Chem. Engrs, 38, 489 (2007)
Chidambaram M, Can. J. Chem. Eng., 71(6), 974 (1993)
Al-Bastaki N, Abbas A, Desalination, 136(1-3), 255 (2001)
Al-Bastaki NM, Abbas A, Desalination, 123(2-3), 173 (1999)
Heinz BW, Georges B, J. of Membr. Sci., 80, 35 (1993)
Spiazzi E, Lenoir J, Grangeon A, J. Membr. Sci., 80, 49 (1992)
Garo V, Ananth A, Erdogan G, Chem. Eng. Sci., 43, 2957 (1988)
Rajiv Y, Rinker GR, Chem. Eng. Sci., 44, 2191 (1989)
Unni MP, Hudgins RR, Silverton PL, Can. J. Chem., Eng., 31, 623 (1973)
Winzeler HB, Belfort G, J. Membr. Sci., 80, 35 (1993)
Kennedy YJ, Merson RL, McCoy BJ, Chem. Eng. Sci., 29, 1927 (1974)
Ilias S, Govind R, Sep. Sci. and Technol., 25 (1990)
Winston WS, Sirkar KK, Membrane handbook, Van Nostrand Reinhold (1992)
Kiatkittipong W, Assabumrungrat S, Praserthdam P, Goto S, J. Chem. Eng. Jpn., 35(6), 547 (2002)
Schulz G, Desalination, 68, 191 (1988)
Prakorn R, Ura P, Korean J. Chem. Eng., 20(4), 724 (2003)
Ramakul P, Pattaweekongka W, Pancharoen U, J. Chin. Inst. Chem. Engrs., 36 (2005)
Prapasawat T, Ramakul P, Satayaprasert C, Pancharoen U, Lothongkum AW, Korean J. Chem. Eng., 25(1), 158 (2008)
Kumar A, Haddad R, Benzal G, Ninou R, Sastre AM, J. Membr. Sci., 174, 17 (2002)
Bird RB, Warren ES, Edwin NL, Transport phenomena, 2nd Edition, John Wiley & Sons, Inc. (2002)
