A highly elevated mass transfer rate process for three-phase, liquid-continuous fluidized beds
Resource
Chemical Engineering Journal 81(2001), 223–230
Journal
Chemical Engineering Journal 81(2001), 223–230
Pages
-
Date Issued
2001
Date
2001
Author(s)
Chen, Chia-Min
Leu, Lii-Ping
DOI
246246/2006111501232992
Abstract
Average gas holdup and gas-to-liquid mass transfer in three-phase fluidized beds with non-Newtonian fluids were studied. The effects
of liquid property, gas distributor type and magnetic field intensity on mass transfer coefficient and overall gas holdup were examined.
The volumetric gas-to-liquid mass transfer coefficient was determined by fitting the oxygen concentration profile data across the bed to
the axial dispersion model. The average gas holdup and mass transfer coefficient were all correlated with operating parameters including
gas velocity and effective viscosity.
Experimental results showed that a three-fold increase in mass transfer coefficient and a two-fold increase in average gas holdup were
observed with properly designed liquid property and gas distributor. A modified process was developed to highly elevate the volumetric
gas-to-liquid mass transfer rate. The bubble coalescing property of three-phase fluidized beds with small particles is eliminated, and its
application to biotechnology and enzyme-catalyzed processes with high gas-to-liquid mass transfer rate could be achieved.
Subjects
Three-phase fluidized beds
Mass transfer
Gas holdup
Non-Newtonian fluid
Publisher
Taipei:National Taiwan University Dept Chem Engn
Type
journal article
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