Chemical Engineering April 2020 - 19

to answer these basic questions, it
brings us to scaleup where a sufficient
degree of geometric similarity
is required. Mechanical aspects also
need to be evaluated, as mixing systems
must be designed not only with
respect to strength, but also to ensure
that resonance does not occur, "
says Last.
Last says profound CFD (computational
fluid dynamics) is used
to understand the detailed flows in
the vessel and a FEM (finite element
method) simulation is used to analyze
the forces on the equipment. " In
a lot of cases it is not only the blade
design that is the issue, but also the
feed-and-drain points that can be
improved significantly by testing and
studying the process and equipment
using these methods. "
He stresses the importance of
working with processors, as well as
modern testing, design and production
technologies. " We have been
successfully developing solutions together
with our customers that meet
the increasing demands for chemical
FIGURE 2. In Ystral's Dispermix, the outer part of
the liquid stream is forced through the dispersing
slots. Using this machine, the dissolving time
of materials can be reduced by 90% since the
dispersion prevents agglomeration and simultaneously
reduces the particles size of the granules
products that are economically efficient
by using modern design tools
and new production technologies to
generate up-to-date types of impellers
for optimized mixing, " he says.
" Only an integrated, case-by-case
analysis of a mixing problem will provide
the best technical solution with
regard to investment and operating
costs, as well as energy and resource
efficiency. This integrated approach
combines a straightforward definition
of the requirements, tried and
tested experimental techniques, new
numerical methods and practical experience
with respect to design and
scaling up to full-scale production. "
Combined functions
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APRIL 2020
19
Ystral
tion. " For example, in complex customer
processes where agitation
is combined with other processes,
a combined approach may be
needed, such as in a photochemical
reactor where light is used to initiate
a chemical reaction, " says Last. " Our
photochemical reactor enables customers
to run chlorination reactions
at very mild reaction conditions with
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Chemical Engineering April 2020

Table of Contents for the Digital Edition of Chemical Engineering April 2020
