This is the second part of a two-part paper dealing with the fluid
mechanics and mass transfer
in structured packings for distillation column service. The first
part elucidated pressure drop,
flooding, and liquid holdup. The second part covers the generation
of effective interfacial area
and provides a general correlation for predicting the mass-transfer
efficiency as a function of
surface type, packing geometry, phase flow conditions, and fluid
properties. The mass-transfer
model has been tested against a variety of commercial structured
packings, for distillation
pressures ranging from 0.33 to 20.4 bar. In all cases the fit of
the data is excellent, with the
possible exception of the highest pressures, where additional factors
of axial mixing appear to
have an effect.
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