Kinetic study and thermoxidative degradation of palm oil and biodiesel

Santos, Anne Gabriella Dias; Souza, Luíz Di; Caldeira, Vinícius Patrício da Silva; Farias, Mirna F.; Fernandes, Valter J.; Araújo, Antônio S.

doi:10.1016/j.tca.2014.08.006

Cited by 31 publications

(11 citation statements)

References 20 publications

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“…For the second mass loss (370-470 • C) the average value obtained for the activation energy, 201.7 kJ mol −1 , is twice the value of the first mass loss, and is attributed to the cracking of triglycerides. This value is similar to the one obtained by Melo et al [25] for the cracking of sunflower oil (193 kJ mol −1 ), by Santos et al [24] for the cracking of palm oil (191.3 kJ mol −1 ) and by Sharma and Biswas [28] for the cracking of JO (221.9 kJ mol −1 ).…”

Section: Kinetic Modeling Of Jatropha Oil Crackingsupporting

confidence: 89%

“…The same group [24] showed that the thermal decomposition of palm oil occurred in two steps, with values of activation energy estimated close to 184.6 and 191.3 kJ mol −1 , for the first and second events respectively. Melo et al [25] studied the kinetics of sunflower oil decomposition in absence or presence of H-Beta zeolite, using a TG equipment.…”

Section: Introductionmentioning

confidence: 93%

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Mo influence on the kinetics of jatropha oil cracking over Mo/HZSM-5 catalysts

et al. 2017

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Section: Kinetic Modeling Of Jatropha Oil Crackingsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 93%

Mo influence on the kinetics of jatropha oil cracking over Mo/HZSM-5 catalysts

et al. 2017

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“…TG analysis of palm oil exhibited two mass losses (Santos et al, 2014). The largest mass loss (88%) occurred in the range 325−486 • C is linked to the decomposition of triglycerides.…”

Section: Oxidation Mechanism and Detectionmentioning

confidence: 99%

“…Melting point, crystallization and oxidation process can be studied. Thermogravimetry (TG) and Differential Scanning Calorimetry (DSC) are useful to assess the oxidative stability of oils and can be suitable for the evaluation of the efficiency of anti-oxidants (Santos et al, 2014;Rudnik et al, 2001). Near Infrared Emission photometer (NIRES) allows the determination of the induction time of edible oils by monitoring the emissivity of hydroperoxide band (2900 nm, 3450 cm −1 ).…”

Section: Assessment Of the Physico-chemical Properties Of Oilsmentioning

confidence: 99%

Physico-chemical durability criteria of oils and linked bio-based polymers

Irshad

Delor‐Jestin

Cartigny

et al. 2015

OCL

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-The oxidative stability or durability is an important indicator of performance that depends on the composition of the sample. The fatty oil or polymer degradation processes have generally been established as being free radical mechanism yielding primary oxidation products. We propose to explain in detail all the analytical methods and tools used for the determination of the initial physico-chemical properties of oils and the properties in ageing conditions. Chemical titrations for acid or peroxide value, Rancimat method or thermogravimetric measurements are discussed. Accelerated ageing tools for thermal or photochemical exposures are also shown. After the assessment of oil durability, the development of new bio-based polymer with vegetable oil is tackled because of its industrial interest. It is essential to understand the long term behavior of oils and biopolymers and to assess exactly the durability which is useful to produce life cycle analysis of materials. At last we underline the advantages of a new Fourier transform infrared (FTIR) instrumentation with in-situ irradiation and gas cell to give a screening of the durability of various oils or polymers. Main durability criteria of oils and biopolymers are linked to the production of volatile organic compounds and the resistance to the oxidation process.Keywords: Fatty acid / thermal degradation / photochemical degradation / durability criteria / bio-based polymers Résumé -Critères de durabilité physico-chimique des huiles et polymères bio-sourcés associés. La stabilité ou la durabilité oxydative est un indicateur important de performance qui dépend de la composition de l'échantillon. Les processus de dégradation d'une huile ou d'un polymère ont généralement été établis comme étant un mécanisme radicalaire conduisant à des produits d'oxydation primaires. Nous proposons de détailler tous les méthodes et outils d'analyses pour la détermination des propriétés physico-chimiques initiales d'huiles ainsi que les propriétés en conditions de vieillissement. Les dosages chimiques pour un indice d'acide ou un indice peroxyde, la méthode Rancimat ou les mesures thermogravimétriques sont discutés. Des outils de vieillissement accéléré pour exposition thermique ou photochimique sont aussi présentés. Après l'estimation de la durabilité d'une huile, le développement de nouveaux polymères bio-sourcés à partir d'huile est abordé en raison de son intérêt pour les industriels. Il est essentiel de comprendre le comportement à long terme des huiles et des biopolymères et d'estimer avec précision la durabilité, paramètre qui est utilisé pour produire l'analyse du cycle de vie de matériaux. Finalement nous soulignons les avantages d'un nouvel instrument de spectroscopie infra-rouge à transformée de Fourier (FTIR) avec une irradiation in-situ et une cellule gaz, qui donne un screening de la durabilité de différentes huiles ou polymères. Les principaux critères de durabilité des huiles et biopolymères sont associés à la production de composés organiques volatils et à la ré...

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“…Also, the kinetic modeling of the oxidation of methyl esters, which are the main components of biodiesels in a jet-stirred reactor, has been studied [32][33][34]. In addition, the kinetics and combustion process of various vegetable oils and biomass, which can be converted into biofuels, have been studied by means of the TGA analysis [35][36][37][38][39]. Due to the importance of different structure organic esters in many industrial applications, the studies of their thermal stability, pyrolysis and combustion kinetics are still of high importance and intensely discussed.…”

Section: Introductionmentioning

confidence: 99%