As an alternative to the conventional chemically catalyzed process,
biodiesel can also be produced using enzymatic catalysis.
Chemical processes give high yield in short reaction times but
requires vegetable oil of high quality or alternatively a two-step
process with acidic esterification of FFA prior to alkaline transesterification.
Difficulties in the recovery of the catalyst and glycerol and
potential pollution to the environment are other disadvantages in
alkali or acid catalyzed processes. Another issue is the energy consumed
since the reaction is conducted at high temperatures [1,11].
The method with enzymes as the catalyst has developed quickly in
recent years