Transesterifikasi In situ Biji Kemiri (Aleurites Moluccana L) Menggunakan Metanol Daur Ulang dengan Bantuan Gelombang Ultrasonik

The purpose of this research was to study the effect of the use of recovered methanol for in situ transesterification reaction candlenut seed (Aleurites moluccana L) as a biodiesel bysonication. The influence of the ratio of recovered methanol to seed, catalyst concentration, reaction time and the temperature was investigated. Important properties of biodiesel such as density, viscosity and acid number were checked according to SNI 7182:2012 standards. The result showed that the maximum yield which has been obtained was 57,85% at recovered methanol to seed ratio 40:1, catalyst concentration 4%, reaction temperature 65 °C and reaction time 80 minutes. The test result of biodiesel properties showed that two parameters (density and viscosity) were conformed to SNI 7182:2012 standards, meanwhile acid value was higher than the maximum standards. In conclusion, the recovered methanol was feasible to produce biodiesel via in situ transesterification but the yield was lower if compared with the use of fresh methanol