SOLID-LIQUID MASS-TRANSFER IN 3-PHASE FLUIDIZED-BEDS - SOME SCALE-UP EFFECTS

Solid-liquid mass transfer in three phase fluidized beds is reported f or column diameter up to 0.3 m. The range of superficial gas and liqui d velocities studied were 0.03-0.2 m/s and 0.026-0.07 m/s, respectivel y for a 0.015 m diameter column and 0.015-0.11 m/s and 0.01-0.05 m/s, for a 0.3 m diameter column. The mass transfer coefficient increased w ith increase in gas flow rate and was independent of liquid flow rate over the range studied. The mass transfer coefficient seemed to depend on particle size; the dependance was unaffected by reactor scale-up. k(SL) increased with column diameter according to relation k(SL) is-pr oportional-to D0.26.