Mass Transfer in a Gas-Solid Packed Column at Trickle Flow
نویسنده
چکیده
The hetght of an ovemll transfer unat has been evaluated m a gas-solid packed column at tnckle flow by measunng column performance during steady state adsorption expertments. Results have been anterpreted wtth an extmctton model mass transfer and axial dispersaon ua both phases Usmg Bodenstem numbers for the gas and solid phases from a previous investagation the hetght of a true transfer untt has been calculated The column was fdled with dumped Pall rings,, the solid phase was a freely flowing catalyst carrier, and the gas phase was air at am bren t conda tions con tatnang freon-l 2 as adsorbing component. At low gas velocities column performance ts enttrely determrned by axaal drsperston but at htgher gas velocities mass transfer hmt tattons become amportan t. For condttions of pmctacal amportance the height of a true transfer untt corresponds to 4 9 Pall nng layers.
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