Table 3 shows the values obtained for the solubility of Sacha
inchi oil in SC-CO2 at 40 and 60 ◦C and 100, 200, 300 and 400 bar.
The results showed that the solubility varied from0.5 to 15 g/kg CO2
at 40 ◦C and from 0.3 to 17 g/kg CO2 at 60 ◦C, within the pressure
range of 100–400 bar.
The trend observed was a decrease in solubility at low pressures
with an increase in temperature, except at 400 bar, where
the solubility increased with increase of temperature. The solubility
increased with temperature at higher pressures (400 bar), but
decreased slightly at a pressure of 300 bar as a result of the wellestablished
crossover of the solubility isotherms generally observed
for oils [31]. This is due to the fact that an increase in temperature
at constant pressure leads to a drop in CO2 density, as well as
an increase in the solute vapor pressure. Fig. 4 clearly shows that
the crossover pressure for Sacha inchi oil was between 300 and
400 bar. The crossover phenomenon is due to the competing effects
of reduction in density of the SC-CO2 and increase in solute volatility,
which accompany the temperature rise [32]. It was observed
that the solubility increased with pressure and temperature above
350 bar. Above this crossover point, the oil solubility increased from
14.67 to 16.64 g/kg at 40 and 60 ◦C, respectively (Table 3), the change