Blends of the biodiesel with diesel are designated as ‘‘B” followed
by a volumetric percentage of the biodiesel in the blend.
For example, B5 stands for the blend of 5 vol% biodiesel and
95 vol% diesel. Shown in Fig. 4b, the trend of distillation curves
of the blends was similar to that of diesel at a percentage of the
biodiesel below 50 vol%. The percentage of diesel had little influence
on the IBP. The IBP was 170–172 C for all the blends. However,
the FBP decreased with increasing percentage of the
biodiesel. It was 368 C for B5 while 354 C for B75. As expected,
the mid-boiling point increased by increasing the proportion of
the biodiesel. They were, for instance, 304 C, 328 C and 334 C
for B20, B50 and B75.
3.2