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Received June 10, 2002
Accepted December 12, 2002
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Phase Hold-up and Critical Fluidization Velocity in a Three-Phase Inverse Fluidized Bed
Department of Chemical Engineering, Chungnam National University, Daejeon 305-764, Korea 1Department of Chemical Engineering, KAIST, Daejeon 305-701, Korea
hchoi@cnu.ac.kr
Korean Journal of Chemical Engineering, January 2003, 20(1), 163-168(6), 10.1007/BF02697203
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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_x000D_
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.
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Krishnaish K, Guru S, Sekar V, Chem. Eng. J., 51, 109 (1993)
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