temperatures of 170 and 220 °C, the maximum concentrations
were much lower than the values of solubility.
From this result, it can be concluded that mass transfer
influences the extraction process at these temperatures,
due to the solubility increase. The single data point on
the graph is the maximum extract concentration resulting
from the extraction at 170 °C at low flow rate of 2
mL min-1, which was closer to the value of solubility. At
this lower flow rate, the mass transfer problem was
minimized and the extraction was conducted closer to
equilibrium.