Chemical Engineering September 2014 - 28

L.B. Bohle
Newsfront
ficiency from the machine's process
zone, rather than through power
capabilities alone. For newer applications,
such as reactive extrusion
and devolatilization, as well as
traditional chemical industry applications,
such as processing catalysts,
mastics, graphite and carbonbased
materials, and in plastics
compounding, B&P's TriVolution
kneader (Figure 1) offers a non-traditional
operating principle in an
effort to increase efficiency.
The kneader leverages elongational
mixing to stretch and disperse
viscous materials. Elongational
mixing imparts a high degree
of particle droplet deformation and
breakup to finely disperse materials
without excessive shear or heat
generation. The TriVolution offers
twelve pin-flight intermeshing
zones in the cross section versus two
for a typical twin-screw extruder
or three for a typical continuous
Figure 2. The
BCG extruder
offers a monoblock
design that
features no dead
spaces or connections,
which makes
installation and
cleaning easy
kneader. The key to improved efficiency
lies in these twelve zones,
where elongational flow action occurs,
says Lazorchak.
Several aspects of the design enRG
LF+SS Ad_7x4.88.pdf 1 8/7/14 10:28 AM
able efficient extrusion, especially
in devolatilization and reactive extrusion.
Smaller channels and quick
multiplication of flow splitting for a
given throughput result in thinner
material thicknesses. This creates
shorter diffusion paths for volatiles
to escape from the melt. Larger free
volume for a given screw diameter
offers longer residence times. And,
says Lazorchak, narrow residencetime
distribution, coupled with excellent
surface-area renewal, promote
efficient temperature control
of the melt. Volatile byproducts can
be efficiently removed and a greater
number of molecular chains are exposed
for higher reaction rates.
In industries such as pharmaceuticals,
where there may be frequent
changeovers and contamination is
a risk, efficiency in changeover and
cleaning the equipment, in addition
to better controls for more efficient
throughput, are high priorities. For
this reason, L.B. Bohle Maschinen +
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28 ChemiCal engineering www.Chemengonline.Com September 2014

http://adlinks.che.com/50980-03 http://www.Chemengonline.Com

Chemical Engineering September 2014

Table of Contents for the Digital Edition of Chemical Engineering September 2014

Contents
Chemical Engineering September 2014 - Cover1
Chemical Engineering September 2014 - Cover2
Chemical Engineering September 2014 - Contents
Chemical Engineering September 2014 - 2
Chemical Engineering September 2014 - 3
Chemical Engineering September 2014 - 4
Chemical Engineering September 2014 - 5
Chemical Engineering September 2014 - 6
Chemical Engineering September 2014 - 7
Chemical Engineering September 2014 - 8
Chemical Engineering September 2014 - 9
Chemical Engineering September 2014 - 10
Chemical Engineering September 2014 - 11
Chemical Engineering September 2014 - 12
Chemical Engineering September 2014 - 13
Chemical Engineering September 2014 - 14
Chemical Engineering September 2014 - 15
Chemical Engineering September 2014 - 16
Chemical Engineering September 2014 - 17
Chemical Engineering September 2014 - 18
Chemical Engineering September 2014 - 19
Chemical Engineering September 2014 - 20
Chemical Engineering September 2014 - 21
Chemical Engineering September 2014 - 22
Chemical Engineering September 2014 - 23
Chemical Engineering September 2014 - 24
Chemical Engineering September 2014 - 25
Chemical Engineering September 2014 - 26
Chemical Engineering September 2014 - 27
Chemical Engineering September 2014 - 28
Chemical Engineering September 2014 - 29
Chemical Engineering September 2014 - 30
Chemical Engineering September 2014 - 31
Chemical Engineering September 2014 - 32
Chemical Engineering September 2014 - 33
Chemical Engineering September 2014 - 34
Chemical Engineering September 2014 - 35
Chemical Engineering September 2014 - 36
Chemical Engineering September 2014 - 37
Chemical Engineering September 2014 - 38
Chemical Engineering September 2014 - 39
Chemical Engineering September 2014 - 40
Chemical Engineering September 2014 - 41
Chemical Engineering September 2014 - 42
Chemical Engineering September 2014 - 43
Chemical Engineering September 2014 - 44
Chemical Engineering September 2014 - 45
Chemical Engineering September 2014 - 46
Chemical Engineering September 2014 - 47
Chemical Engineering September 2014 - 48
Chemical Engineering September 2014 - 49
Chemical Engineering September 2014 - 50
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Chemical Engineering September 2014 - 57
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Chemical Engineering September 2014 - 80
Chemical Engineering September 2014 - Cover3
Chemical Engineering September 2014 - Cover4
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