Chemical Engineering June 2018 - 54

Ekato
FIGURE 9. The combined gassing impellers provide maximum mass transfer
with the primary disperser (Phasejet) below the self-inducing turbine
(Gasjet)
TiO2, oximes or polymer particles) that must be prevented
from settling and be distributed as homogeneously
as possible within the tank. The settling rate of
the solids together with the solids concentration is relevant
for the design of the agitator. The concentration
of solids, their particle-size distribution, the liquid viscosity
and the density difference between solids and
liquid must therefore be known. Organic solids exhibit
generally low densities (for instance, ~1,400 kg/m3 for
PVC and 1,500-1,600 kg/m3 for C-PVC, depending
on product specifications [16]) and their suspending
should not be a critical issue.
Floating may at times be observed in the case of
poorly wetting solids during concurrent gassing or
de-gassing of a reaction byproduct, such as HCl in
chlorinations (Figure 2). Since solid particles adhere to
gas bubbles, they may rise to the liquid surface and
develop with the foam into a stable layer. A surface
impeller would break up the foam and minimize the
layer by forcing the particles down into the turbulent
reaction system.
Gas dispersion. A large fraction of the photochemical
processes are based on the photochemical reactivity
of bromine, chlorine, nitrosyl chloride, oxygen or sulfur
dioxide that may be introduced into the reaction
systems in liquid or in gaseous form. Gases must be
dispersed as finely as possible to maximize the rate of
dissolution in a given solvent or solvent mixture. The
combined gassing system, as depicted in Figure 9,
provides optimum mass transfer [17]: controlled by the
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Chemical Engineering June 2018

Table of Contents for the Digital Edition of Chemical Engineering June 2018

Contents
Chemical Engineering June 2018 - Cover1
Chemical Engineering June 2018 - Cover2
Chemical Engineering June 2018 - Contents
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Chemical Engineering June 2018 - Cover3
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