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An enzymatic/acid-catalyzed hybrid process for biodiesel production from soybean oil |
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| Authors: | Wei-Jia Ting Chun-Ming Huang Nair Giridhar Wen-Teng Wu |
| Affiliation: | aDepartment of Chemical Engineering, National Tsing Hua University, Hsinchu 30043, Taiwan bDepartment of Engineering, The University of Waikato, Hamilton 3240, New Zealand cDepartment of Chemical Engineering, National Cheng Kung University, Tainan 70101, Taiwan |
| Abstract: | The present study is aimed at developing an enzymatic/acid-catalyzed hybrid process for biodiesel production using soybean oil as feedstock. In the enzymatic hydrolysis, 88% of the oil taken initially was hydrolyzed by binary immobilized lipase after 5 h under optimal conditions. The hydrolysate was further used in acid-catalyzed esterification for biodiesel production and the effects of temperature, catalyst concentration, feedstock to methanol molar ratio, and reaction time on biodiesel conversion were investigated. By using a feedstock to methanol molar ratio of 1:15 and a sulfuric acid concentration of 2.5%, a biodiesel conversion of 99% was obtained after 12 h of reaction at 50 °C. The biodiesel produced by this process met the American Society for Testing and Materials (ASTM) standard. This hybrid process may open a way for biodiesel production using unrefined and used oil as feedstock. |
| Keywords: | Acid catalyst Binary immobilized lipase Biodiesel Hybrid process |
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