H. Liu et al., INFLUENCE OF SOLVENT CONTENT ON PHASE-TRANSITION TEMPERATURES OF OIL SEDIMENT AND SOLUTION VISCOSITY IN ACETONE CANOLA OIL SYSTEMS, Journal of the American Oil Chemists' Society, 73(9), 1996, pp. 1137-1141
The effect of acetone on phase transition behavior of sediment in cano
la oil was studied by differential scanning calorimetry under dynamic
heating/cooling regimes. The melting temperature of sediment decreased
with an increase in the solvent content of canola oil, suggesting an
increase in the solubility of sediment in the oil solution. The crysta
llization of sediment in oil solution was facilitated by acetone, as i
ndicated by the increase in the sediment crystallization temperature.
Acetone dramatically reduced the viscosity of canola oil, particularly
in the first 30% addition. The reduction of viscosity was far less wi
th further addition of acetone. These results suggested that the optim
um range of acetone content needed for sediment precipitationin canola
ail would be in the range of 30-40%. A linear relationship was found
between the density of canola oil and temperature. The influence of so
lvent on the density of canola oil/acetone solution can be accounted f
or by the mixing theory of ideal solutions, whereas the effect of temp
erature on the dynamic viscosity of oil solution is best described by
a modified Arrhenius equation.