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Synthesis of biodiesel by two-step transesterification from crude jatropha curcus L.oil using ultrasonic irradiation assisted |
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| รหัสดีโอไอ | |
| Creator | 1. Ittipon Worapun 2. Kulachate Pianthong 3. Prachasanti Thaiyasuit |
| Title | Synthesis of biodiesel by two-step transesterification from crude jatropha curcus L.oil using ultrasonic irradiation assisted |
| Publisher | Faculty of Engineering, Khon Kaen Univeristy |
| Publication Year | 2553 |
| Journal Title | KKU Engineering Journal |
| Journal Vol. | 37 |
| Journal No. | 3 |
| Page no. | 169-179 |
| Keyword | Biodiesel, Two-step transesterification, Crude jatropha curcus L. oil, Ultrasonic irradiation |
| ISSN | 0125-8273 |
| Abstract | Usually, the crude Jatropha curcas L. oil has very high free fatty acid (FFA) which obstructs the transesterification reaction. As a result it provides low yield of biodiesel production. The objective of this research is to investigate the optimum conditions for biodiesel production from crude Jatropha curcas L.oil with methanol by ultrasonic irradiation (at 40 kHz frequency and 400 Watt) assisted, using two-step catalyzed method. In the first step, the reaction was carried out in the presence of sulfuric acid as an acid catalyst. The product was then further transesterified with potassium hydroxide in the second step. The effects of different operating parameters such as molar ratio of reactants, catalyst quantity, operating temperature, and time of reactants have been studied with the aim of process optimization. In the first step, the optimum conditions for the acid catalyzed esterification process have been obtained as ratio of methanol to oil as 15% w/w, catalyst concentration of 3% w/w, temperature as 30?C and reaction time as 20 minutes. For the second step, theoptimum conditions for the base catalyzed transesterification process have been obtained as ratio of methanol to oil as 15% w/w, catalyst concentration of 1% w/w, temperature as 30?C, and reaction time as 40 minutes. It has been observed that the mass transfer and kinetic rate enhancements were due to the increase in interfacial area and activity of the microscopic and macroscopic bubbles formed. The efficacy of usingultrasonic irradiation has been compared with conventional mechanical stirring method. The results indicated that the reaction time is much lower in the case of ultrasonic irradiation and high conversion as compared to stirring method. |
