000			02184nab a2200229 4500
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245	0	0	_aThermogravimetric studies on pyrolysis and combustion behavior of a heavy oil and its asphaltenes
270			_a26/11/2008 ; 20/06/2006
300			_a6 p.
520			_aTranscripción del resumen publicado por el autor: A thermogravimetric analyzer (TGA) was used to obtain information on the pyrolysis and combustion behavior of both crude oil (Neilburg) and its asphaltenes, each mixed with reservoir sand. Of all the saturate, aromatic, resin, and asphaltene fractions, asphaltenes contribute the most to the formation of coke (fuel). Temperature-ramped as well as the isothermal pyrolysis experiments on whole oil and asphaltenes were analyzed to determine the temperature at which coke formation was maximized. Furthermore, isothermal combustion curves for coke derived from whole oil and asphaltenes were obtained to provide reliable data for calculating the kinetics of the reactions. The classical Arrhenius model was applied, and the activation energy for the combustion of coke formed from pure asphaltenes and from the whole oil was calculated. The results showed that the Arrhenius model fitted the data well in the entire range of temperatures the experiments were conducted. The source material for the coke led to modest differences in its reactivity. The observed activation energy for asphaltenes was 117.7 kJ/mol, and for the whole oil it was 129.5 kJ/mol, which indicates that they were in close agreement. Also, the combustion of coke from asphaltenes showed a reaction order of 0.4 at 375°C, which gradually increased to 0.9 at 525°C. For whole oil, it increased from 0.5 at 375°C to 0.7 at 500°C.
773	0		_tEnergy & fuels _gVol. 20, no. 2 (mar./abr. 2006) ; p. 560-565
942			_cARTICULO
100	1		_aAmbalae, Aprameya _948647
100	1		_aMahinpey, Nader _948648
650		0	_aGravimetría _910817
650		0	_aPirólisis _9993
650		0	_aPetróleos pesados _922736
650		0	_aAsfaltenos _920433
700	1		_aMahinpey, Nader _948648
999			_c179735 _d179735