Food Science and Technology,
Journal Year:
2023,
Volume and Issue:
43
Published: Jan. 1, 2023
In
order
to
improve
separating
aromatic/aliphatic
group
in
adhesives
or
solvents
of
food
packaging
materials
by
pervaporation,
an
across
linked
graphene
oxide
(GO)
framework
were
incorporated
into
waterborne
polyurethane
(WPU)
membrane.
The
improved
benzene
solubility
and
expanded
interlayer
pathway
modified
membrane
have
been
gained
based
on
three
different
reduced
oxide.
Compared
P-phenylenediamine
(PPD)
ethane-diamine
(EDA)
reducing
agents,
O-phenylenediamine
(OPD)
showed
a
relatively
mild
ability
allowed
GO
form
layer-to-layer
lamella
the
WPU
matrix
easily.
When
dose
GO-OPD
was
0.03%,
flux
GO-OPD/WPU
1.58
times
neat
GO/WPU
membranes,
while
separation
factor
slightly
improved.
/WPU
also
maintained
good
stability
continuous
pervaporation
process
2700
min.
Environmental Chemistry Letters,
Journal Year:
2024,
Volume and Issue:
22(2), P. 505 - 560
Published: Feb. 6, 2024
Abstract
Membrane
filtration
is
a
major
process
used
in
the
energy,
gas
separation,
and
water
treatment
sectors,
yet
efficiency
of
current
membranes
limited.
Here,
we
review
use
machine
learning
to
improve
membrane
efficiency,
with
emphasis
on
reverse
osmosis,
nanofiltration,
pervaporation,
removal
pollutants,
pathogens
nutrients,
separation
carbon
dioxide,
oxygen
hydrogen,
fuel
cells,
biodiesel,
biogas
purification.
We
found
that
brings
substantial
improvements
performance
leading
specialized
remarkable
potential
for
various
applications.
This
integration
offers
versatile
solutions
crucial
addressing
global
challenges
sustainable
development
advancing
environmental
goals.
techniques
capture
purification
industrial
gases,
aiding
reduction
dioxide
emissions.
Green Chemistry,
Journal Year:
2024,
Volume and Issue:
26(10), P. 5708 - 5743
Published: Jan. 1, 2024
Bio-upcycling
of
monomers
recovered
from
poly(ethylene
terephthalate)
(PET)
waste
is
a
novel
alternative
to
turn
recycling
process
more
economically
attractive
by
obtaining
several
products
with
higher
added
value.
Plastics
show
the
strongest
production
growth
of
all
bulk
materials
over
last
decade.
The
industry's
current
trajectory
is
exponential
and
plastic
expected
to
double
or
triple
by
2050.
rapidly
increasing
plastics
continued
reliance
on
fossil
fuels
for
production,
have
contributed
numerous
environmental
problems
health
harms.
As
a
result,
pollution
has
become
an
threat
natural
ecosystems,
human
climate.
However,
there
lack
granularity
contribution
primary
specifically
greenhouse
gas
(GHG)
emissions
their
impact
remaining
global
carbon
budget
needed
stay
below
1.5°C
2°C
average
temperature
rise.
In
this
report,
we
explore
climate
change
disaggregated
polymer
technology.
To
end,
developed
comprehensive
bottom-up
modeling
GHG
from
with
special
focus
value
chains.
We
analyzed
results
under
various
scenarios
in
context
budgets
compatible
trajectory.
Modeling
includes
material
flows
stages,
processes
technologies
used
chains,
including
extraction
required
shaping
final
product.
nine
major
types
fuel-based
polymers
that
are
produced
consumed
large
quantities:
three
polyethylene
(PE)
–
low-density
(LDPE),
linear
(LLDPE),
high-density
(HDPE)
as
well
polypropylene
(PP);
terephthalate
(PET);
polyvinyl
chloride
(PVC);
polystyrene
(PS)
other
key
styrene-based
such
styrene
acrylonitrile
(SAN)
butadiene
(ABS),
polyurethane
(PU).
Together
these
account
about
80%
production.
Our
estimates
generated
2.24
gigatonnes
dioxide
equivalent
(GtCO2e)
2019,
representing
5.3%
total
(excluding,
agriculture
LULUCF
(Land
Use,
Land-Use
Change
Forestry)).
Emissions
combustion
process
heat
electricity
non-combustion
processes.
Approximately
22%,
21%,
15%
related
2019
come
PEs
together,
PET,
PP,
respectively.
Other
plastics,
i.e.,
PVC,
PS,
SAN,
ABS,
PU
responsible
around
23%
Most
(~75%)
occur
steps
prior
polymerization.
Under
conservative
scenario
(2.5%/yr),
would
more
than
4.75
GtCO2e
2050,
accounting
21-26%
keep
increases
1.5°C.
At
4%/yr
growth,
increase
times
6.78
GtCO2e,
25-31%
limiting
warming
Such
detailed
individual
polymers,
where
chain
stages
fully
taken
into
account,
can
provide
sound
technically
neutral
scientific
foundation
inform
treaty
enable
stronger
coordination
treaties
(e.g.,
United
Nations
Framework
Convention
Climate
(UNFCCC).
also
critical
understand
impacts
proposed
mitigation
measures
treaty,
most
either
polymer-specific
different
implications
per
polymer.
ACS Sustainable Resource Management,
Journal Year:
2025,
Volume and Issue:
2(2), P. 334 - 342
Published: Jan. 23, 2025
Poly(ethylene
terephthalate)
(PET)
is
still
a
major
player
in
the
plastics
industry,
especially
for
packaging.
Despite
attempts
to
derive
its
basic
components
from
biological
resources,
production
of
terephthalic
acid
(TPA),
one
two
PET
monomers,
depends
on
fossil
resources.
Alongside
traditional
polyesters,
TPA
building
block
also
biodegradable
polymers,
such
as
poly(1,4-butylene
adipate-co-1,4-butylene
(PBAT).
Here,
PET,
PBAT,
and
real
plastic
waste
were
successfully
depolymerized
using
Humicola
insolens
cutinase
an
environmentally
friendly
alternative
mechanical
or
chemical
treatments
allowing
recovery
even
mixed
waste.
This
monomer
was
isolated
high
purity
upon
acidification
confirmed
by
Fourier
Transform-Infrared
Spectroscopy,
1H-NMR
spectroscopy,
Thermogravimetric
analysis.
Consequently,
contaminants
residual
buffer
salts
caused
issues
during
synthesis
precursors
reaction
with
ethylene
glycol
(EG)
TPA.
The
recovered
used
prepare
bis(hydroxyethyl)
terephthalate
(BHET)
further
repolymerized
PET.
resulting
molecular
weight
polyesters
found
be
dependent
catalyst
used.
Polymers,
Journal Year:
2022,
Volume and Issue:
14(8), P. 1604 - 1604
Published: April 14, 2022
Pervaporation
is
one
of
the
most
active
topics
in
membrane
research,
and
it
has
time
again
proven
to
be
an
essential
component
for
chemical
separation.
It
been
employed
removal
impurities
from
raw
materials,
separation
products
by-products
after
reaction,
pollutants
water.
Given
global
problem
water
pollution,
this
approach
efficient
removing
hazardous
substances
bodies.
Conventional
processes
are
based
on
thermodynamic
equilibria
involving
a
phase
transition
such
as
distillation
liquid–liquid
extraction.
These
techniques
have
relatively
low
efficacy
nowadays
they
not
recommended
because
sustainable
terms
energy
consumption
and/or
waste
generation.
emerged
1980s
now
becoming
popular
technology
its
intrinsic
features
requirements,
cheap
costs,
good
quality
product
output.
The
focus
review
current
developments
pervaporation,
mass
transport
membranes,
material
selection,
fabrication
characterization
techniques,
applications
various
membranes
chemicals
Periodica Polytechnica Chemical Engineering,
Journal Year:
2024,
Volume and Issue:
68(1), P. 106 - 115
Published: March 7, 2024
In
this
study,
we
developed
novel
phosphoric
acid
crosslinked
blend
membranes
for
the
pervaporation
separation
of
tetrahydrofu-ran/water
mixtures.
Sodium
alginate
and
chitosan
were
prepared
by
solution
casting
solvent
evaporation
technique.
These
with
in
isopropanol/water
baths
used
feed
mixtures
ranging
from
6
to
43
wt.%
water
tetrahydrofuran
(THF)/water
at
30
°C.
Crosslinking
was
confirmed
Fourier
transform
infrared
(FTIR)
Ion
Exchange
Capacity
(IEC)
study.
Thermal
stability
crystallinity
determined
thermogravimetric
analysis
(TGA)
X-ray
diffraction
(XRD)
studies
respectively.
The
surface
morphology
observed
using
Scanning
electron
microscopy
(SEM).
Sorption
carried
out
evaluate
extent
interaction
degree
swelling
THF,
binary
effect
experimental
parameters
such
as
composition,
membrane
thickness,
permeate
pressure
on
performance
phosphorylated
determined.
found
have
good
potential
breaking
azeotrope
94
THF
a
selectivity
459
normalized
flux
0.25
kg
m−2
h−1
10
µm.
exhibited
reduction
an
improvement
increasing
compositions.
Selectivity
improved
decreased
thickness.
Both
pressure.
The
primary
objective
of
this
research
is
to
enhance
a
novel
method
for
the
eco-friendly
production
trimethyl
borate
(TMB)
from
ulexite
ore
by
utilizing
carbon
dioxide.
Notably,
CO2,
major
greenhouse
gas,
converted
into
thermodynamically
stable
CaCO3
following
TMB
synthesis.
TMB,
significant
organo-boron
chemical,
has
wide
range
industrial
applications.
In
study,
process
consists
three
main
steps:
reaction,
distillation,
and
pervaporation.
Trimethyl
was
synthesized
through
reaction
with
methanol
in
high-pressure
reactor
under
CO2
atmosphere.
obtained
liquid
product
subjected
distillation
produce
TMB–methanol
azeotrope.
Following
process,
separation
azeotrope
mixture
achieved
pure
were
characterized
confirmed
using
Fourier
transform
infrared
(FTIR)
spectroscopy
gas
chromatography
(GC).
research,
hydroxyethyl
cellulose
(HEC)
polyvinylpyrrolidone
(PVP)
used
as
membrane
materials.
Blend
membranes
prepared
solution
casting
evaporation
method.
morphologies
FTIR
spectroscopy,
thermogravimetric
analysis
(TGA),
X-ray
diffraction
(XRD),
scanning
electron
microscopy
(SEM),
contact
angle
assessment.
pervaporation
performance
all
blend
evaluated
effects
operating
temperature,
feed
concentration,
PVP
ratios
on
investigated.
results
demonstrated
that
purity
97.71
wt
%
when
PVP–HEC-2
utilized
conclusion,
study
introduces
an
innovative
environmentally
friendly
producing
valuable
chemicals,
highlighting
its
potential
