Chemical Engineering June 2018 - 53
Cover Story
Ekato
FIGURE 8. Shown here are
horizontal sections of flow velocities
at the well housing of
radiation sources in a stirredtank
photochemical reactor
(13)
Identical mixing times and homogeneities
on all operational scales (laboratory, pilot,
production) are only achieved if n is kept
constant for geometrically similar designs of
the reactor unit. However, if n is kept constant,
the required impeller power, P, would
grow uneconomically high with P ∝ D5, as
seen by Equation (14):
(14)
tion system must accomplish the following
fundamental tasks:
Blending. In order to ensure equal physical
and chemical reaction conditions in all areas
of the tank, temperature and concentration
gradients must be balanced. In the turbulent
flow range, as is always the case in this type
of reactor, the blend time number, that is, the
product of stirrer speed, n, and blend time,
θ, is constant [13]:
Longer mixing times at lower speed
would hence result, but can at least partially
be compensated by a reasonable
combination of type and number of impellers
that would match with the impeding effects
of the tank internals. The concept of
the blend time fits exactly in with the model
of the impeller pumping rate [see Equations
(7-9)]: in order to achieve a defined degree
of homogeneity, a defined number of recirculations
of the tank content is required.
Suspending. Educts, catalysts and products
of photochemical processes are often
solid components (for example, C-PVC,
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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
Chemical Engineering June 2018 - 2
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Chemical Engineering June 2018 - Cover3
Chemical Engineering June 2018 - Cover4
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