3.1.3. CO2 flow rate effect
Oil yield increases from 5.7% to 17.2% by increasing the
flow rate from 5 to 17 kg CO2/h. The composition of the
extracts depends on the used flow rate. The oil content in
the extracts is quite constant (from 21 to 35%). The water
content, however, varies much more; it is at its lower level
(6 and 5%) for medium flow rates (9 and 14 kg/h).Although the influence of process parameters on the
level of polyphenol in oil is not clear, we can notice that
53.8 MPa, 104 8C and 17 kg CO2/h are the studied conditions
that give the highest amount of polyphenol in oil
(350 50 mg GAE/kg oil).