Nevertheless, excess amount of methanol is commonly
employed for shifting the equilibrium of transesterification reaction
to the product side [34]. Fig. 6c shows the effect of methanol:
oil molar ratio on the FAME yield and oil conversion during
transesterification reactions of waste oil with methanol at five different
molar ratios of methanol to oil (i.e. 3:1, 10:1, 15:1, 20:1 and
30:1).