UPWARD COCURRENT GAS-LIQUID-(SOLID) CONTACTORS - HOLDUP, AXIAL DISPERSIONS, GAS-LIQUID MASS-TRANSFER

Hydrodynamic and gas-liquid mass transfer parameters have been determi ned in common equipment, i.e. same column and liquid and gas distribut ors, for three cocurrent, upflow gas-liquid contactors: bubble column, fluidized bed and packed column. Two tracer analysis, one with an ine rt liquid tracer, the other one with a transferable gas tracer have be en used in order to determine the parameters of the axial dispersion m odel: liquid holdup, gas and liquid axial dispersions, and gas-liquid mass transfer coefficient. The influence of gas and liquid velocities and particle diameters has been observed. The effects of additives as electrolytes or glycerol have been investigated.