Setiyo Gunawan : Biodiesel production from rice bran by a two-step in-situ process
Setiyo Gunawan S.T., Ph.D
The production of fatty acid methyl esters (FAMEs) by a two-step in-situ transesterification from two kinds of ricebran was investigated in this study. The method included an in-situ acid-catalyzed esterification followed by an in-situ base-catalyzed transesterification. Free fatty acids (FFAs) level was reduced to less than 1% for both ricebran A (initial FFAs content = 3%) and ricebran B (initial FFAs content = 30%) in the first step under the following conditions: 10 g ricebran, methanol to ricebran ratio 15 mL/g, H2SO4 to ricebran mass ratio 0.18, 60 �C reaction temperature, 600 rpm stirring rate, 15 min reaction time. The organic phase of the first step product was collected and subjected to a second step reaction by adding 8 mL of 5 N NaOH solution and allowing to react for 60 and 30 min for ricebran A and ricebran B, respectively. FAMEs yields of 96.8% and 97.4% were obtained for ricebran A and ricebran B, respectively, after this two-step in-situ reaction.