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1138449 
Journal Article 
A kinetic study of the esterification of free fatty acids (FFA) in sunflower oil 
Berrios, M; Siles, J; Martin, MA; Martin, A 
2007 
1 
Fuel
ISSN: 0016-2361
EISSN: 1873-7153 
Elsevier Science, The Boulevard Kidlington Oxford OX5 1GB 
86 
15 
2383-2388 
Esterification of free fatty acids (FFA) in sunflower oil was studied. The influence of temperature on the kinetic constants was determined by fitting the results to the Arrhenius equation. The energy of activation for the forward reaction decreased with increasing catalyst concentration from 50745 to 44559 J/mol. FFA in sunflower oil could be effectively removed by esterification with methanol, using a 5% sulphuric acid concentration relative to FFA, a methanol/oleic acid mole ratio of 60:1, a temperature of 60 degree C and agitation at a speed of 250 rpm or higher. The experimental results were found to fit a first-order kinetic law for the forward reaction and a second-order one for the reverse reaction. 
biodiesel; esterification; FFA; kinetics; sunflower 
IRIS
• Methanol (Non-Cancer)
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