In contrast, when the extraction solvent was n-hexane, the
equilibrium constant values were lower, making clear the superior
oil extraction capacity of this solvent. In this case, temperature did
not affect this parameter.
The ratio of the concentration of extractable material between
the solid phase and the drained miscella is shown in Fig. 1. For
ethanol, the shape of the curve exhibits a linear region at lower
concentrations and a moderately curved behavior at higher concentrations,
similar to those reported by Abraham et al. (1988), who
studied oil extraction from cotton seed using ethanol, and by Perez
et al. (2011), who analyzed oil extraction from different ground
sunflower seeds using n-hexane as solvent at 50 C. Experimental
data were adjusted according to the following equation (P