On the basis of ongoing research conducted on the clarification of processes responsible for lubricant degradation in the environment of piston grooves in exhaust gas recirculation (EGR) diesel engines, an experimental investigation was aimed to develop a kinetic model, which can be used for the prediction of lubricant oxidative degradation correlated with endurance test conducted on engines. Knowing that base oils are a complex blend of paraffins and naphthenes with a wide range of sizes and structures, their chemistry analysis during the oxidation process can be highly convoluted. In the present work, investigations were carried out with the squalane chosen for its physical and chemical similarities with the lubricant base oils used during the investigations. Thermo-oxidative degradation of this hydrocarbon was conducted at atmospheric pressure in a tubular furnace, while varying temperature and duration of the tests in order to establish an oxidation reaction rate law. The same experimental procedures were applied to squalane doped with two different phenolic antioxidants usually present in engine oil composition: 2,6-di-tert-butyl-4-methylphenol and octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate. Thus, the effect of both antioxidants on the oxidation rate law was investigated. Data analysis of the oxidized samples (Fourier transform infrared spectroscopy and gas chromatography/mass spectrometry) allowed rationalization of the thermo-oxidative degradation of squalane. The resulting kinetic modeling provides a practical analytical tool to follow the thermal degradation processes, which can be used for prediction of base oil hydrocarbon aging. If experiments confirmed the role of phenolic additives as an effective agent to lower oxidation rates, the main results lie in the observation of a threshold temperature where a reversed activity of these additives was observed.
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e-mail: moussa@dcmr.polytechnique.fr
e-mail: michel.sablier@dcmr.polytechnique.fr
e-mail: anthony.lenegrate@mpsa.com
e-mail: mehdi.elfassi@mpsa.com
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March 2010
Research Papers
Kinetic Study of the Thermo-Oxidative Degradation of Squalane Modeling the Base Oil of Engine Lubricants
Moussa Diaby,
Moussa Diaby
Ecole Polytechnique,
e-mail: moussa@dcmr.polytechnique.fr
Laboratoire des Mécanismes Réactionnels
, CNRS 91128 Palaiseau Cedex, France
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Michel Sablier,
Michel Sablier
Ecole Polytechnique,
e-mail: michel.sablier@dcmr.polytechnique.fr
Laboratoire des Mécanismes Réactionnels
, CNRS 91128 Palaiseau Cedex, France
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Anthony Le Negrate,
Anthony Le Negrate
PSA Peugeot Citroën,
e-mail: anthony.lenegrate@mpsa.com
Centre Technique de Vélizy
, 78943 Vélizy-Villacoublay Cedex, France
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Mehdi El Fassi
Mehdi El Fassi
PSA Peugeot Citroën,
e-mail: mehdi.elfassi@mpsa.com
Centre Technique de Vélizy
, 78943 Vélizy-Villacoublay Cedex, France
Search for other works by this author on:
Moussa Diaby
Ecole Polytechnique,
Laboratoire des Mécanismes Réactionnels
, CNRS 91128 Palaiseau Cedex, Francee-mail: moussa@dcmr.polytechnique.fr
Michel Sablier
Ecole Polytechnique,
Laboratoire des Mécanismes Réactionnels
, CNRS 91128 Palaiseau Cedex, Francee-mail: michel.sablier@dcmr.polytechnique.fr
Anthony Le Negrate
PSA Peugeot Citroën,
Centre Technique de Vélizy
, 78943 Vélizy-Villacoublay Cedex, Francee-mail: anthony.lenegrate@mpsa.com
Mehdi El Fassi
PSA Peugeot Citroën,
Centre Technique de Vélizy
, 78943 Vélizy-Villacoublay Cedex, Francee-mail: mehdi.elfassi@mpsa.com
J. Eng. Gas Turbines Power. Mar 2010, 132(3): 032805 (9 pages)
Published Online: November 30, 2009
Article history
Received:
March 9, 2009
Revised:
April 7, 2009
Online:
November 30, 2009
Published:
November 30, 2009
Citation
Diaby, M., Sablier, M., Le Negrate, A., and El Fassi, M. (November 30, 2009). "Kinetic Study of the Thermo-Oxidative Degradation of Squalane Modeling the Base Oil of Engine Lubricants." ASME. J. Eng. Gas Turbines Power. March 2010; 132(3): 032805. https://doi.org/10.1115/1.3155797
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