Abstract
We studied the hydrodynamic characteristics of a three-phase inverse fluidized bed made of a transparent acrylic column of 0.115 m inner diameter and 2 m heights. Air, water and polyethylene particles were used as the gas, liquid and solid phase, respectively. We used both hydrophobic low density polyethylene (LDPE) and hydrophilic LDPE as solid phase, and distilled water as liquid phase, and filtered air as gas phase. The LDPE was chemically treated by chlorosulfonic acid to change the surface property from hydrophobic to hydrophilic. We tried to solely investigate the effect of the surface hydrophilicity of polymeric particles on the phase holdup and the critical fluidization velocity of three-phase inverse fluidization. Thus, we measured the static pressure and eventually observed critical fluidization velocity. Critical fluidization velocity became smaller in case of using MDPE hydrophobic particles than LDPE hydrophilic particles. This was thought to be due to the retardation of rising bubbles near hydrophobic particles and, subsequently, the increase of gas hold-up.
Article PDF
Similar content being viewed by others
Explore related subjects
Discover the latest articles, news and stories from top researchers in related subjects.Avoid common mistakes on your manuscript.
References
Briens, C. L., Ibrahim, Y.A.A., Margaritis, A. and Bergougnou, M.A., “Effect of Coalescence Inhibitors on the Performance of Threephase Inverse Fluidized-bed Columns,”Chem. Eng. Sci.,54, 4975 (1999).
Buffiere, P. and Moletta, R., “Some Hydrodynamic Characteristics of Inverse Three Phase Fluidized-bed Reactors,”Chem. Eng. Sci.,54, 1233 (1999).
Choi, H. S. and Shin, M. S., “Hydrodynamics Study of Two Different Inverse Fluidized Reactors for the Application of Wastewater Treatment,”Korean J. Chem. Eng.,16, 670 (1999).
Comte, M. P., Bastoul, D., Hebrard, G., Roustan, M. and Lazarova, V., “Hydrodynamics of a Three-phase Fluidized Bed the Inverse Turbulent Bed,”Chem. Eng. Sci.,52, 3971 (1997).
Fan, L. S., Muroyama, K. and Chern, S. H., “Hydrodynamic Characteristics of Inverse Fluidization in Liquid-solid and Gas-liquid-solid Systems,”Chem. Eng. J.,24, 143 (1982).
Han, H.D., Choi, H. S., Kang, Y. and Kim, S. D., “Effect of the Surface Property of Solid Particles on the Hydrodynamic Characteristics of Three-Phase Inverse Fluidized Bed,”HWAHAK KONGHAK,40, 209 (2002).
Kang, Y., Woo, K. J., Ko, M. H. and Kim, S. D., “Particle Dispersion and Pressure Fluctuations in Three-phase Fluidized Beds,”Chem. Eng. Sci.,52, 3723 (1997).
Kang, Y., Woo, K. J., Ko, M.H. and Kim, S. D., “Unsteady State Behavior and Fluctuations of Fluidized Particles in Three Phase Fluidized Beds,”HWAHAK KONGHAK,33, 633 (1995).
Kang, Y., Woo, K. J., Ko, M.H., Cho, Y. J. and Kim, S.D., “Particle Flow Behavior in Three-Phase Fluidized Beds,”Korean J. Chem. Eng.,16, 784 (1999).
Kim, S. D. and Kang, Y., “Heat and Mass Transfer in Three-phase Fluidized-bed Reactor-an Overview,”Chem. Eng. Sci.,52, 3639 (1997).
Kim, S. D. and Kim, C. H., “Three Phase Fluidized Beds,”HWAHAK KONGHAK,18, 5 (1980).
Krishnaiah, K., Guru, S. and Sekar, V., “Hydrodynamic Studies on In-verse Gas-liquid-solid Fluidization,”Chem. Eng. J.,51, 109 (1993).
Muroyama, K. and Fan, L. S., “Fundamentals of Gas-Liquid-Solid Fluidization,”AIChE J.,31, 1 (1985).
Uribe-Salas, A., Gomez, O. and Finch, A., “A Conductivity Technique For Gas Solids Holdup Determination in Three-phase Reactor,”Chem. Eng. Sci.,49, 1 (1994).
Wallis, G., “One-Dimensional Two Phase Flow,” McGraw-Hill, New York (1969).
Yang, D. C., Kim, J. H. and Yoo, Y. J., “Development of Support by Chemical Modification for the Immobilization of Activated Sludge,”HWAHAK KONGHAK,35, 129 (1997).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Han, HD., Lee, W., Kim, YK. et al. Phase hold-up and critical fluidization velocity in a three-phase inverse fluidized bed. Korean J. Chem. Eng. 20, 163–168 (2003). https://doi.org/10.1007/BF02697203
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02697203