KINETIC MODELING OF TRANSESTERFICATION REACTION FOR BIODIESEL PRODUCTION USING HETEROGENEOUS CATALYST
Titel:
KINETIC MODELING OF TRANSESTERFICATION REACTION FOR BIODIESEL PRODUCTION USING HETEROGENEOUS CATALYST
Auteur:
N. JAYA, K. ETHIRAJULU
Verschenen in:
International journal of engineering science and technology
Paginering:
Jaargang 3 (2011) nr. 4 pagina's 3463-3466
Jaar:
2011
Inhoud:
Biodiesel derived from renewable plant sources is monoalkyl esters of long chain fatty acids which fall in the carbon range of C12-C22. It has similar properties as mineral diesel. Various processes exist to convert vegetable oils into biodiesel. Transesterification of such vegetable oils using alcohol in the catalytic environment is most commonly used method for producing biodiesel. The equilibrium conversion of triglycerides is affected by various factors namely feed Quality (like free fatty acid content, water content etc.),type of alcohol used, molar ratio of alcohol to triglycerides, type of catalyst, amount of catalyst, reaction temperature, reaction time and stirring rates. The present work reports on the characterization of cotton seed oil and production of biodiesel. This study also reports on the optimal operating parameter for cotton seed oil inbatch reactor. The main thrust of present work was to study the kinetics, modeling and simulation of anionic ion exchange resin catalyzed transesterification of cotton seed oil. Experiments were carried out in batch reactor to generate kinetic data and a kinetic model was developed. The effect of temperature, catalyst concentration and molar ratio of methanol to triglycerides and stirring rates were investigated. A few fuel properties were alsomeasured for biodiesel to observe its competitiveness with onventional diesel fuel. The equilibrium conversions of triglycerides were observed to be in the range of 85%. It was also observed that higher conversion was achieved at 6:1 molar ratio of ethanol to oil, 2 wt.% of anionic resin catalyst ,temperature at 338 K, reaction time of 180 minutes with stirring speed 10 Hz. Model parameters such as order, activation energy and rate constants were calculated, the overall activation energy was also estimated. The rate constants werefound to increase with an increase in temperature and catalyst concentration. Various simulations were also carried out at different conditions. Effects of varying parameters were studied in simulations. This simulation leads to a better understanding of the influence of the interactions between the reaction parameters and alsohelps to improve the efficiency of the transesterification process.
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