Chemical Engineering March 2019 - 17

Carbios
FIGURE 2. Carbios is developing an enzyme-based process to selectively de-polymerize PET from
streams of mixed plastic waste in an effort to obtain high-purity monomers for new PET
ponent plastic packaging films.
The use of these layered materials
is widespread, and confers desirable
functionality to the films in
use. Examples are PE/PA, PE/PP,
PE/PET. But the layering makes
recycling the films after use problematic.
A recently commercialized
technology from APK AG (Merseburg,
Germany; www.apk-ag.de)
is aimed directly at this problem.
The company's NewCycling technology
allows the recycling of
multi-layer flexible films in packaging
applications.
" In commonly used mechanical
recycling processes, multi-layer
films end-up in many cases in incineration
or are recycled to re-granulates
with a quality just suitable
for low-value applications, such as
grass pavers or pallets, " says Florian
Riedl, director of business development
at APK.
APK developed NewCycling as
a way to separate the polymers in
multilayer films so they can be used
in applications normally for virgingrade
polymers. In NewCycling, the
polymers are dissolved selectively
by specially designed polymer-specific
solvents. One component of
the multi-layer film is dissolved while
the other is left as a solid. Then the
two components (solid of one species
and liquid of another) are separated
using a rotating system. The
result of the process are sorted regranulates
(for example, PE and PA)
with very high purity. The re-granulates
are suitable to use them again
in demanding applications, such as
flexible packaging, Riedl says, so
" we are offering an active contribution
to the circular economy and
help to achieve the growing recycling
targets set by the industry and
legislation. "
The APK solvents are removed
from the plastic polymer to levels
below 1,000 parts per million,
Riedl says, and the pure stream
of polymer is then sent to an extruder,
where it is pelletized for sale
to makers of plastic films for packaging.
The solvents are recovered
for re-use in the process. One initial
application will be for non-foodcontact
plastic pouches for laundry
detergent, Riedl notes.
After developing the process at
pilot scale for the past three years,
APK has built its first commercialscale
production line for making
plastic pellets from recycled multilayer
films. The plant, located in
Merseburg, Germany, began production
of pellets last month. The
plant is capable of producing 8,000
ton/yr of pellets from post-industrial
waste (off-specification film material).
APK is planning to build a second
commercial plant to produce
plastics from post-consumer waste
CHEMICAL ENGINEERING WWW.CHEMENGONLINE.COM
MARCH 2019
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17

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Chemical Engineering March 2019

Table of Contents for the Digital Edition of Chemical Engineering March 2019

Contents
Chemical Engineering March 2019 - Cover1
Chemical Engineering March 2019 - Cover2
Chemical Engineering March 2019 - Contents
Chemical Engineering March 2019 - 2
Chemical Engineering March 2019 - 3
Chemical Engineering March 2019 - 4
Chemical Engineering March 2019 - 5
Chemical Engineering March 2019 - 6
Chemical Engineering March 2019 - 7
Chemical Engineering March 2019 - 8
Chemical Engineering March 2019 - 9
Chemical Engineering March 2019 - 10
Chemical Engineering March 2019 - 11
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Chemical Engineering March 2019 - 13
Chemical Engineering March 2019 - 14
Chemical Engineering March 2019 - 15
Chemical Engineering March 2019 - 16
Chemical Engineering March 2019 - 17
Chemical Engineering March 2019 - 18
Chemical Engineering March 2019 - 19
Chemical Engineering March 2019 - 20
Chemical Engineering March 2019 - 21
Chemical Engineering March 2019 - 22
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Chemical Engineering March 2019 - 24
Chemical Engineering March 2019 - 25
Chemical Engineering March 2019 - 26
Chemical Engineering March 2019 - 27
Chemical Engineering March 2019 - 28
Chemical Engineering March 2019 - 29
Chemical Engineering March 2019 - 30
Chemical Engineering March 2019 - 31
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Chemical Engineering March 2019 - Cover3
Chemical Engineering March 2019 - Cover4
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