After set up the apparatus, carbon dioxide was charged into the
extraction cell while the pump was set at the selected operating
pressure and temperature was obtained by pump, oven, and preheating
coil. After that the pump is turned off and isolated with
a shut-off valve. Subsequently, a constant static extraction time is
allowed for SCO2 to dissolve the PA, BA, and MA. By passing the
CO2 at a constant flow rate, the dissolved components via static
and dynamic extraction is discharged from the cell, trapped and
collected, while the back pressure regulator was heated to prevent
crystallization of PA, BA and MA at the exit when temperature and
pressure decreased [1]. Collection vessel (15) consists of stainless
steel bead which was fixed in vessel for increasing trapping [17].
After each extraction run, the whole system was washed up with
ethanol (6) in which the valve (8) was opened and ethanol was
pumped by high-pressure piston pump (7), and then purged with
carbon dioxide.
After set up the apparatus, carbon dioxide was charged into the
extraction cell while the pump was set at the selected operating
pressure and temperature was obtained by pump, oven, and preheating
coil. After that the pump is turned off and isolated with
a shut-off valve. Subsequently, a constant static extraction time is
allowed for SCO2 to dissolve the PA, BA, and MA. By passing the
CO2 at a constant flow rate, the dissolved components via static
and dynamic extraction is discharged from the cell, trapped and
collected, while the back pressure regulator was heated to prevent
crystallization of PA, BA and MA at the exit when temperature and
pressure decreased [1]. Collection vessel (15) consists of stainless
steel bead which was fixed in vessel for increasing trapping [17].
After each extraction run, the whole system was washed up with
ethanol (6) in which the valve (8) was opened and ethanol was
pumped by high-pressure piston pump (7), and then purged with
carbon dioxide.
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