To this day a liquid/liquid-extraction column can be reliably dimensioned only from preliminary tests in pilot plant columns using the original fluids. The disadvantage of this procedure is that large quantities of fluids are necessary which are often difficult to provide. For this reason, the aim of the chemical industry is to develop new dimensioning techniques. To achieve this goal, attention has turned to the investigation of the fundamental behaviour of single particles (drops and rigid spheres) in extraction columns. The main objective of this work is the investigation of the influence of column internals such as sieve trays, structured packings or agitators on the velocities, the breakage mechanisms and the mass transfer rates of single drops. When the fundamental behaviour of single drops is properly understood, the interactions of drops in a swarm have to be studied for an accurate scale-up. Thus, fluiddynamics and mass transfer rates of swarms of drops in different extractors are examined and a new model to predict the hold-up influence on the motion of a swarm is presented.
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To this day a liquid/liquid-extraction column can be reliably dimensioned only from preliminary tests in pilot plant columns using the original fluids. The disadvantage of this procedure is that large quantities of fluids are necessary which are often difficult to provide. For this reason, the aim of the chemical industry is to develop new dimensioning techniques. To achieve this goal, attention has turned to the investigation of the fundamental behaviour of single particles (drops and rigid sph...
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