An experimental study was carried out into the effect of fluid
properties upon mass transfer coefficients in packed distillation
columns. A column consisting of 19 stainless steel discs supported
in a vertical row, with each disc at right angles to its neighbour,
was used for this purpose. This assembly was contained in a 1 in.
diameter glass tube which allowed observation of the liquid running
over the discs.
Distillation runs were made with the systems ethanol/water,
isopropanol/water, ethanol/benzene and benzene/n-heptane. With
surface tension negative mixtures, sprays of droplets were emmitted
from the liquid as it ran over the junctions between the discs. The
phenomenon was filmed using high speed cine photography.
In order to eliminate hydrodynamic effects in droplet formation
the surface of a stationary sessile drop supported on a
horizontal disc under total reflux conditions was also observed.
Small droplets were seen to be ejected from the surface of the
sessile drop with surface tension negative conditions, and again
filmed using high speed cine photography.
The additional interfacial area caused by droplet formation
in the disc column was shown to be negligible.
Experimental rashl ts, in the disc column wi th systems in
which the vapour phase controls the mass transfer rate were used
to establish correlations for the vapour side mass transfer
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.