PURIFICATION
OF TWIN-SCREW
EXTRUDER-PRESSED
SUNFLOWER
OIL
ULTRAFILTRATION MEMBRANES
of address
This on
of
oil wing
was conducted
twin-screw oil and
membranes
with
a
molecular
of
10, 30
50
a
permeation m
2
.
Several were
to
the and
by of
pressure, and
was
low
for membranes
rested a
long period No
long-term fouling
appeared during the processing.
with MWCO of membrane,
pressure
and rate.
of
26
was
obtained operating
of
and
membrane membranes
to
a
on
removals, with
INTRODUCTION Industrial
oil from
seeds
is commonly
realized through mechanical pressing
with a hydraulic or
single
expeller press,
followed by solvent Today, extensive
studies
on
oil
using a extruder
to
have carried out
1994; and
1997; al.,
2005, 2006; 2005.
Twin-screw
extruder
is gradually
more
used production
of
a
wide
variety
of due
its capability
to
conduct diverse and
processes.
Despite the quality
o f pressed
oil
is
usually better
the
quality
of
oil obtained from
solvent
a
process is
required to
remove undesirable
components
on
flavour,
and
main
contaminants and impurities are phospholipids,
pigments,
free
fatty acids
and
oxidation Conventional edible
oil refining is
commonly
realized
through many
steps
including degumming,
and consume
large
of
energy,
and chemical
with
much neutral
oil,
and
natural and
creation of large
amount
of
undesired
by
products and Nakajima,
996.
Owing
to
its benefits and
advantages
the
simplicity
of
the gentle nature of
the the
usual
low
energy no addition
of
easy
change
of scale and
low
and
the membrane
technology
has
showed
a
promising alternative
for refining
1987; 1997;
and
1997; al.,
2001,2004; 2002;
and al.,
2003;
2003, al.,
2005;
al.,
application of this
can retain
and
other desirable components
in
oil.
Among
the steps of
oil
the
application
of
oil degumming using
technology attracted
a few
and 1997;
al.,
al., 1999;
al., 2001;
Kim 2002;
2002: 2001,
It
concerns
the elimination
of the
also
called gums,
in oil.
Classic
oil
degumming
is
usually realized by
58 Perf.
phospholipids
precipitation
a
small
quantity
of
water or and
separation
by centrifugation.
Most
o f the
studies focused
on gum
removal
solvent
mixture 1987; Snape and
Kwiatkowski
and
but only
few studies
were related to
oil
organic
solvent.
The limitation in
case
comes
from low
permeate
flux
as
a consequence
of high The permeate
flux
can
improved
by
optimizing operating parameters
pressure, feed velocity
and
by applications
of tangential flow and suitable membrane
module. In process
application, tangential
or
filtration
is
most used due
to its
ability
to
create
turbulence at
the surface
and minimize concentration
polarization
and
fouling. In
addition, this
can be
well adapted when
it
is
applied
at
different membrane
module
designs.
The
most
common
designs
include flat sheet,
spiral wound,
tubular, and
hollow
fiber. Flat sheet, tubular and
designs
are preferred
for
tangential filtration of
suspensions
containing and
these have intermediate to very
low tendency
to
clog and
exhibit
high fluxes
fort 1994.
The objective
o f this
work
was to
evaluate
different
membranes
under
different operating
for
twin-screw extruder-pressed sun flower
oils
purification.
The performance
of membrane was
characterized with the permeate
flux,
the phosphotipids
rejection but
also
the color
and the
free fatty
acid
removal.
The
influence
operating
conditions pressure,
tern tangential flow
rate
parameters was
with pol
PES
membranes
cassette
with
a
molecular
weight
MWCO
of
10, 30
