Transesterification is the process of exchanging acyl groups between an ester and an
alcohol, to produce biodiesel and glycerine (Ranganathan et al., 2008; Akoh et al., 2007).
The sequence of the transesterification process is shown in Figure 3.2. The initial step of
pretreatment is followed by transesterification and purification. The fatty ester is released
simultaneously with the reformation of the hydroxyl (OH) group in glycerol. The general
transesterification equation is follows: