KINETIKA TRANSESTERIFIKASI BIODIESEL JARAK PAGAR
Biodiesel were produced by trans-etherification of castor oil with alcohol in the presence of NaOH catalyst. The<br />reaction mechanism and model of castor oil trans-etherification is<br />A + 3B C + 3 D<br />A, B, C, and D were castor oil, alcohol, glycerol, and ester. The reacti...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Diponegoro University
2012-07-01
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| Series: | Teknik |
| Subjects: | |
| Online Access: | http://ejournal.undip.ac.id/index.php/teknik/article/view/4383 |
| Summary: | Biodiesel were produced by trans-etherification of castor oil with alcohol in the presence of NaOH catalyst. The<br />reaction mechanism and model of castor oil trans-etherification is<br />A + 3B C + 3 D<br />A, B, C, and D were castor oil, alcohol, glycerol, and ester. The reaction rate equation was r=-dCA/dt =<br />k1(CA)(CB)3–k2(CC)(CD)3. In this study was used two measurement method of free fat acid as the rest content of<br />castor oil with SNI 01-3555-1998 and AOAC (Association of Analytical Chemist). It found that SNI 01-3555-<br />1998 method was the easier and the acurate measurement. The classification of alcohol used was methanol and<br />ethanol to compare the action both of them. Methanol produces the higher conversion than ethanol. The reaction<br />in a batch reactor with temperature 40, 50, and 60°C in atmospheric pressure as the operation condition to<br />looking for kinetics parameter of trans-etherification. Coefficient reaction rate and activation energy were look<br />into kinetics study. Reaction rate was a mathematics model as a function of concentration and time which solved<br />by Runge-Kutta, multivariable optimization and SSE (some square error) method using Matlab. The activation<br />energy (Ea) and impact factor (A) obtained by linier regression method. The result of study obtained the kinetics<br />parameter of trans-etherification with methanol k1=1.9313x1031exp (-41.940/RT) average error 0.0010 and<br />k2=2.7678x1025exp(-37.362/ RT) average error 0.0003. While kinetics parameter of trans-etherification with<br />ethanol obtained k1=1.168x1019exp(-24.588/ RT) average error 0.0306 and k2=4.9966x106exp(-10.328/RT)<br />average error 0.1589. It means, more reactive alcohol then bigger the value of kinetics parameter. |
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| ISSN: | 0852-1697 2460-9919 |