Environments,
Journal Year:
2025,
Volume and Issue:
12(4), P. 127 - 127
Published: April 18, 2025
Waste
polyethylene
terephthalate
(PET)
bottles
represent
12%
of
global
plastic
waste;
however,
only
9%
are
recycled.
Hydrothermal
processing
presents
the
opportunity
to
upcycle
waste
PET
into
its
monomers,
particularly,
terephthalic
acid
(TPA).
In
this
study,
post-consumer
sparkling
water
were
neutrally
hydrolysed
via
a
hydrothermal
process
operating
within
temperature
range
220–270
°C,
residence
time
30–90
min,
and
autogenous
pressure
25–90
bar.
Under
these
conditions,
TPA
yield
varied
between
7.34
81.05%,
maximum
was
obtained
at
250
90
40
The
had
more
profound
impact
on
conversion
than
time.
values
environmental
factor
(EF)
found
be
0.017–0.106,
which
comparable
those
bulk
chemicals
(EF
<
1).
With
chosen
energy
(EEI)
production
estimated
5.29
×
104
°C
min.
findings
demonstrate
that
neutral
hydrolysis
is
feasible
approach
for
converting
polymers
monomers
under
mild
conditions.
addition,
GCMS
analysis
aqueous-phase
product
revealed
notable
increase
in
secondary
degradation
products
TPA,
such
as
benzoic
acid,
rising
from
66.4%
75.7%
increased
220
270
°C.
mechanisms
decarboxylation,
dehydration,
oxidation.
dominant
mechanism
decarboxylation
reaction.
Chemical Reviews,
Journal Year:
2024,
Volume and Issue:
124(5), P. 2617 - 2650
Published: Feb. 22, 2024
The
societal
importance
of
plastics
contrasts
with
the
carelessness
which
they
are
disposed.
Their
superlative
properties
lead
to
economic
and
environmental
efficiency,
but
linearity
puts
climate,
human
health,
global
ecosystems
at
risk.
Recycling
is
fundamental
transitioning
this
linear
model
into
a
more
sustainable,
circular
economy.
Among
recycling
technologies,
chemical
depolymerization
offers
route
virgin
quality
recycled
plastics,
especially
when
valorizing
complex
waste
streams
poorly
served
by
mechanical
methods.
However,
exists
in
interlinked
system
end-of-life
fates,
complementarity
each
approach
key
environmental,
economic,
sustainability.
This
review
explores
recent
progress
made
five
commercial
polymers:
poly(ethylene
terephthalate),
polycarbonates,
polyamides,
aliphatic
polyesters,
polyurethanes.
Attention
paid
not
only
catalytic
technologies
used
enhance
efficiencies
also
interrelationship
other
systemic
constraints
imposed
Novel
polymers,
designed
for
depolymerization,
concisely
reviewed
terms
their
underlying
chemistry
potential
integration
current
plastic
systems.
Green Chemistry,
Journal Year:
2024,
Volume and Issue:
26(12), P. 6857 - 6885
Published: Jan. 1, 2024
Amongst
all
synthetic
polymers
used
in
the
clothing
industry,
polyethylene
terephthalate
(PET)
is
most
widely
polyester,
its
fibres
representing
half
total
PET
global
market
(in
comparison
bottle
being
less
than
a
third).
Chemical Communications,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
A
novel
terephthalate-based
ionic
liquid
catalyst
is
promotes
highly
efficient
neutral
hydrolysis
of
PET
without
attendant
inactivation
or
product
contamination.
Recycling,
Journal Year:
2024,
Volume and Issue:
9(3), P. 37 - 37
Published: May 6, 2024
This
review
article
gathers
the
most
recent
recycling
technologies
for
thermoset
and
thermoplastic
polymers.
Results
about
existing
experimental
procedures
their
effectiveness
are
presented.
For
polymers,
focuses
mainly
on
fibre-reinforced
polymer
composites,
with
an
emphasis
epoxy-based
systems
carbon/glass
fibres
as
reinforcement,
due
to
environmental
concerns
of
end-of-life
management.
Thermal
processes
(fluidised
bed,
pyrolysis)
chemical
(different
types
solvolysis)
discussed.
The
combined
(microwave,
steam,
ultrasonic
assisted
techniques)
extraordinary
attempts
(electrochemical,
biological,
ionic
liquids)
analysed.
Mechanical
that
leads
downgrading
materials
is
excluded.
Insights
also
given
upcycling
methodologies
have
been
implemented
until
now
reuse
fibres.
As
state-of-the-art
approach
common
matrices
presented,
together
appropriate
additivation
matrix
upcycling.
Mechanical,
chemical,
enzymatic
described,
among
others.
use
composites
quite
new,
thus,
achievements
With
all
above
information,
this
extensive
can
serve
a
guide
educational
purposes,
targeting
students
technicians
in
polymers
recycling.
Polymer Chemistry,
Journal Year:
2024,
Volume and Issue:
15(7), P. 585 - 608
Published: Jan. 1, 2024
This
review
discusses
the
physical-,
chemical
recycling
and
biodegradation
processes
mechanisms
of
PET,
proposing
effecting
compromise
between
its
overall
properties
conferred
intrinsic
biodegradability
by
modified
monomer
polymerisation.
Chemical Society Reviews,
Journal Year:
2024,
Volume and Issue:
53(19), P. 9609 - 9651
Published: Jan. 1, 2024
We
present
the
state-of-the-art
of
circular
polymers
based
on
monomer
and
polymer
design
reversible
ring-opening
addition
polymerization
reactions
without
involvement
other
reactants.
