Setiyo Gunawan, Raden Darmawan, Tri Widjaja, Achmad Roesyadi : Biodiesel Production from Rice Bran by in-situ Esterification: The Effect of Methanol Concentration and Reaction Time
Setiyo Gunawan S.T., Ph.D
Raden Darmawan S.T., M.T.
Prof. Dr. Ir. Tri Widjaja M.Eng.
Prof. Dr. Ir. Achmad Roesyadi M.Sc
Fuel has an important role in the economy of every country. Therefore, improving energy efficiency, developing clean energy, and securing stable energy supply are the framework of Indonesia�s sustainable energy policies. Furthermore, finding alternative renewable energies becomes an important topic. Biodiesel (fatty acid methyl ester , FAMEs) is biodegradable, renewable, non-toxic and environmentally friendly energy. The economic competitiveness of biodiesel can be improved by applying in-situ process. This method didn�t include extraction time from seeds, and actually extraction oil from oilseed is not a short step. However, the excess alcohol was needed. In this study, in-situ esterification of high-acidity rice bran with methanol and sulfuric acid catalyst was investigated. The effects of methanol concentration and reaction time on purity and yield of biodiesel were discussed. Increasing the methanol dose from 50 to 200 mL increased the FAMEs yield by about 12%. The yield of FAMEs increased from 8 to 48% when the reaction time was increased from 10 to 60 min. The best conditions are: methanol of 200 ml, H2SO4 to methanol = 5% (v/v), temperature of 60oC, reaction time of 60 min and stirrer rate of 600 rpm. The major constituents were oleat methyl esters followed by palmitate methyl esters.