The knowledge of drop rates has a big impotence to compute different processes of chemical technology, in particular, extraction processes. In industry extraction system is the complex polidisperse system. The first step to know these systems is to consider the behavior of a single drop. An experimental study of drop rise velocities was carried out in the system butyl acetate / water and benzene / water. A large effort has been made to prevent the system from contaminations. Typical regimes of droplet movement were shown in dependence of drop sizes. Correlations from the literature show excellent agreement with experiments.
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