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Rodrguez R.P.,University of Habana | Perez L.G.,University of Habana | Alfonso M.,Research Center for Sugar Technologies | Duarte M.,Research Center for Sugar Technologies | And 4 more authors.
Journal of Thermal Analysis and Calorimetry | Year: 2012

The thermal behavior and oxidative stability of Jatropha curcas oils and their derived fatty acid ethyl esters (FAEE) obtained from two different Cuban regions and varieties are evaluated. A decrease in acid value is found for the FAEE compared to the oils from both natural sources. Primary and secondary oxidation products are significantly different among samples. Thermogravimetry and the derivate thermogravimetry were applied to the oils and FAEE samples using air and nitrogen atmospheres. The main differences between oil and FAEE derived from Jatropha oil are the number of decomposition steps that are lower in FAEE samples. Concerning the onset temperature in the mass loss process, no pattern is observed when oils and the derived FAEE are compared. A comparison among biofuels obtained from the different regions shows that the biofuels obtained from one of both plantations are less thermally stable and they also have more oxidation activity. The obtained results can influence the engine performance and exhaust emissions when these biofuels are used as fuels. © Akadémiai Kiadó, Budapest, Hungary 2011.

Rodriguez R.P.,Polytechnic University Jose Antonio Echeverria | Perez L.G.,Polytechnic University Jose Antonio Echeverria | Alfonso M.,Research Center for Sugar Technologies | Duarte M.,Research Center for Sugar Technologies | And 4 more authors.
Biomass and Bioenergy | Year: 2011

The scope of this work is to evaluate some properties of the oils and derived fatty acid ethyl esters (FAEE) from two different Jatropha Curcas species planted in Cuba. The properties that were determined include the acid value, peroxide value, p-anisidine value and fatty acid ethyl esters composition. In order to study the influence of the genus species and geographic conditions on the fuel properties, the oils from Jatropha Curcas planted in two regions of Cuba and their derived FAEE were analyzed and compared. The two plantations were in San José (SJ) and Guantanamo (Gt) representing respectively the western and eastern part of the island.The analyses indicated that the FAEE obtained from Guantanamo has a higher acid value and peroxide value compared with the FAEE from San José. The p-anisidine values did not show a clear trend and the results of gas chromatography-mass spectrometry indicated a similar FAEE composition. The results obtained by gas chromatography are in good agreements with previous reports. © 2011 Elsevier Ltd.

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