that transesterification would not occur if FFA content in the
oil were about 3%. It has been found that the alkaline
catalyzed transesterification process is not suitable to
produce esters from unrefined oils. In order to reduce the
acid value (i.e. for reducing FFA), the oil is to be refined.
Refining of vegetable oils increases the overall production
cost of the biodiesel. Acid esterification is a typical method
of producing biodiesel from high FFA oil [1]. But it requires
more methanol and is time consuming also. Development of
any method to produce the biodiesel from high FFA oils is
significant. Hence, the efforts are made to esterify a typical
high FFA type of oil, i.e. rubber seed oil in this study.