A summary of crude oil composition is given in Table 2, and
the results of proximate analyses on the extracted crude oils are
shown in Table 3. Since the meal produced with solvent having
higher than 50% acetone had the strong odor, properties are
reported only for the crude oils produced with an acetone concentration
²50%. As seen in Table 2, the crude oil compositions
varied insignificantly with the acetone concentration of
the solvent mixture. A small increase in FFA concentration (up
to 1%) and a trace increase in glycerol were observed with the
acetone addition of ²50%. The amount of FFA in crude oils extracted
by the solvent mixtures was slightly higher than that by
100% hexane solvent. The total concentrations of TAG (with
carbon numbers 48, 50, 52, and 54) in crude oils produced by
the acetone/hexane mixtures were reduced by 3 to 4% compared
with that by pure hexane. Since the solvent containing
acetone is more polar than pure hexane, more polar compounds
such as FFA were extracted by the acetone/hexane solvent than
100% hexane, contributing to a reduction in the total concentration
of TAG. This phenomenon, reduction in the total concentration
of TAG with the addition of acetone to hexane,