poster - International Conference of Agricultural Engineering

Figure1 - Relationship between the castor oil density and the temperature, independent of the
genotype tested, no significant interaction. Campina Grande, Paraíba, Brazil.
Point of Minimum Flow
The point of minimum value flow for each genotype were, respectively: BRS Paraguaçu, -
18, 4667°C; BRS Energia, -18.1667°C and wild one, -18.2667°C, considering a low freezing
point in a interval -18.17 to -18.47°C for the three genotypes. This result confirms those
reported by Savy Filho et al. (1999) when said in which the hydroxyl carbon 12 and the
double bond of ricinoleic acid in castor oil confer the characteristic of the lower solidification
temperature.
Viscosity
With respect to the variable viscosity there was statistical significance at the 1% level of
probability by the F test for the factors studied and the interaction between them, indicating
varying behavior between genotypes with respect to different temperatures.
For BRS Paraguaçu found that the effect of temperature on the viscosity of the oil was
cubic nature, with high coefficient of determination, R 2 = 0.91, (Equation 2) indicating a
strong relationship between the variables and explains well the phenomenon with high drop
after 268.15 °K.
Equation: y = 8074886 – 770010x + 243,8188x 2 – 0,2064x 3 (2)
R 2 = 0,9184
The BRS Energia, roughly 130 days earlier than the BRS Paraguaçu and BRS
Nordestina, both cycled more than 240 days, showed a decrease in oil viscosity (Figure 2) at
a lower temperature which, for the production of biodiesel is quite interesting.
Equation: y = 8840041 – 84298x + 266,914x 2 – 0,28064x 3 (3)
R 2 = 0,9305