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Thermal decomposition kinetics of propylcyclohexane / Jason A Widegren in Industrial & engineering chemistry research, Vol. 48 N°2 (Janvier 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p. 654–659 Titre : Thermal decomposition kinetics of propylcyclohexane Type de document : texte imprimé Auteurs : Jason A Widegren, Auteur ; Thomas J. Bruno, Auteur Année de publication : 2009 Article en page(s) : p. 654–659 Note générale : chemical ingenireeng Langues : Anglais (eng) Mots-clés : propylcyclohexane Résumé : As part of a large-scale thermophysical property measurement project, the decomposition kinetics of propylcyclohexane was investigated. Decomposition reactions were performed at 375, 400, 425, and 450 °C in stainless steel ampule reactors. At each temperature, the extent of decomposition was determined as a function of time by gas chromatography. These data were used to derive first-order rate constants for the decomposition of propylcyclohexane. Decomposition rate constants ranged from 3.66 × 10−7 s−1 at 375 °C to 8.63 × 10−5 s−1 at 450 °C. Among other things, these rate constants are useful for planning property measurements at high temperatures. Based on the amount of time required for 1% of the sample to decompose (t0.01), we found that allowable instrument residence times ranged from about 8 h at 375 °C to about 2 min at 450 °C. The kinetic data were also used to determine Arrhenius parameters of A = 2.56 × 1016 s−1 and Ea = 283 kJ·mol−1. In addition to the decomposition kinetics, we have also done a GC−MS analysis in order to identify the most abundant decomposition products. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8008988 [article] Thermal decomposition kinetics of propylcyclohexane [texte imprimé] / Jason A Widegren, Auteur ; Thomas J. Bruno, Auteur . - 2009 . - p. 654–659. chemical ingenireeng Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p. 654–659 Mots-clés : propylcyclohexane Résumé : As part of a large-scale thermophysical property measurement project, the decomposition kinetics of propylcyclohexane was investigated. Decomposition reactions were performed at 375, 400, 425, and 450 °C in stainless steel ampule reactors. At each temperature, the extent of decomposition was determined as a function of time by gas chromatography. These data were used to derive first-order rate constants for the decomposition of propylcyclohexane. Decomposition rate constants ranged from 3.66 × 10−7 s−1 at 375 °C to 8.63 × 10−5 s−1 at 450 °C. Among other things, these rate constants are useful for planning property measurements at high temperatures. Based on the amount of time required for 1% of the sample to decompose (t0.01), we found that allowable instrument residence times ranged from about 8 h at 375 °C to about 2 min at 450 °C. The kinetic data were also used to determine Arrhenius parameters of A = 2.56 × 1016 s−1 and Ea = 283 kJ·mol−1. In addition to the decomposition kinetics, we have also done a GC−MS analysis in order to identify the most abundant decomposition products. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8008988

Thermal decomposition kinetics of the aviation turbine fuel jet A / Jason A Widegren in Industrial & engineering chemistry research, Vol. 47 N° 13 (Juillet 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 13 (Juillet 2008) . - p. 4342–4348 Titre : Thermal decomposition kinetics of the aviation turbine fuel jet A Type de document : texte imprimé Auteurs : Jason A Widegren, Auteur ; Thomas J. Bruno, Auteur Année de publication : 2008 Article en page(s) : p. 4342–4348 Note générale : Bibliogr. p.4347-4348 Langues : Anglais (eng) Mots-clés : Aviation  turbine  fuel  jet  A;  Decomposition;  Kinetic  data Résumé : As part of a large-scale thermophysical property measurement project, the global decomposition kinetics of the aviation turbine fuel Jet A was investigated. Decomposition reactions were performed at 375, 400, 425, and 450 °C in stainless steel ampule reactors. At each temperature, the extent of decomposition was determined as a function of time by gas chromatography. These data were used to derive global pseudo-first-order rate constants that approximate the overall decomposition rate of the mixture. Decomposition rate constants ranged from 5.9 × 10−6 s−1 at 375 °C to 4.4 × 10−4 s−1 at 450 °C. These rate constants are useful for planning property measurements at high temperatures. On the basis of the amount of time required for 1% of the sample to decompose (t0.01), we found that allowable instrument residence times ranged from about 0.5 h at 375 °C to less than 1 min at 450 °C. The kinetic data were also used to derive Arrhenius parameters of A = 4.1 × 1012 s−1 and Ea = 220 kJ·mol−1. In addition to the decomposition kinetics, we have also done a GC-MS analysis of the vapor phase that is produced during the thermal decomposition measurements. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8000666 [article] Thermal decomposition kinetics of the aviation turbine fuel jet A [texte imprimé] / Jason A Widegren, Auteur ; Thomas J. Bruno, Auteur . - 2008 . - p. 4342–4348. Bibliogr. p.4347-4348 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 13 (Juillet 2008) . - p. 4342–4348 Mots-clés : Aviation  turbine  fuel  jet  A;  Decomposition;  Kinetic  data Résumé : As part of a large-scale thermophysical property measurement project, the global decomposition kinetics of the aviation turbine fuel Jet A was investigated. Decomposition reactions were performed at 375, 400, 425, and 450 °C in stainless steel ampule reactors. At each temperature, the extent of decomposition was determined as a function of time by gas chromatography. These data were used to derive global pseudo-first-order rate constants that approximate the overall decomposition rate of the mixture. Decomposition rate constants ranged from 5.9 × 10−6 s−1 at 375 °C to 4.4 × 10−4 s−1 at 450 °C. These rate constants are useful for planning property measurements at high temperatures. On the basis of the amount of time required for 1% of the sample to decompose (t0.01), we found that allowable instrument residence times ranged from about 0.5 h at 375 °C to less than 1 min at 450 °C. The kinetic data were also used to derive Arrhenius parameters of A = 4.1 × 1012 s−1 and Ea = 220 kJ·mol−1. In addition to the decomposition kinetics, we have also done a GC-MS analysis of the vapor phase that is produced during the thermal decomposition measurements. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8000666

Variability of the rocket propellants RP-1, RP-2, and TS-5 / Lisa Starkey Ott in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9225–9233 Titre : Variability of the rocket propellants RP-1, RP-2, and TS-5 : application of a composition- and enthalpy-explicit distillation curve method† Type de document : texte imprimé Auteurs : Lisa Starkey Ott, Auteur ; Amelia B. Hadler, Auteur ; Thomas J. Bruno, Auteur Année de publication : 2009 Article en page(s) : p. 9225–9233 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : Rocket  Propellants  Application  of  a  Composition Résumé : We have recently introduced several important improvements in the measurement of distillation curves for complex fluids. This method is a significant improvement over current approaches, featuring a composition-explicit data channel for each distillate fraction (for both qualitative and quantitative analysis) and an assessment of the energy content of each distillate fraction, among other features. The most significant modification is achieved with a new sampling approach that allows precise qualitative as well as quantitative analyses of each fraction, on the fly. We have applied the new method to the measurement of a wide variety of fluids, including hydrocarbons, gasoline, jet fuel, diesel fuels (both petroleum-derived and biodiesel), and crude oils. In this paper, we present the application of the technique to representative batches of the rocket propellants RP-1, RP-2, and TS-5. We not only present the distillation curves but also utilize the composition-explicit information to characterize distillate cuts in terms of composition and available energy content. The measure we use for the fluid energy content is the composite enthalpy of combustion for each component selected for identification in each distillate fraction. Overall, the distillation curves and enthalpy data for all three fluids are remarkably similar. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800988u [article] Variability of the rocket propellants RP-1, RP-2, and TS-5 : application of a composition- and enthalpy-explicit distillation curve method† [texte imprimé] / Lisa Starkey Ott, Auteur ; Amelia B. Hadler, Auteur ; Thomas J. Bruno, Auteur . - 2009 . - p. 9225–9233. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9225–9233 Mots-clés : Rocket  Propellants  Application  of  a  Composition Résumé : We have recently introduced several important improvements in the measurement of distillation curves for complex fluids. This method is a significant improvement over current approaches, featuring a composition-explicit data channel for each distillate fraction (for both qualitative and quantitative analysis) and an assessment of the energy content of each distillate fraction, among other features. The most significant modification is achieved with a new sampling approach that allows precise qualitative as well as quantitative analyses of each fraction, on the fly. We have applied the new method to the measurement of a wide variety of fluids, including hydrocarbons, gasoline, jet fuel, diesel fuels (both petroleum-derived and biodiesel), and crude oils. In this paper, we present the application of the technique to representative batches of the rocket propellants RP-1, RP-2, and TS-5. We not only present the distillation curves but also utilize the composition-explicit information to characterize distillate cuts in terms of composition and available energy content. The measure we use for the fluid energy content is the composite enthalpy of combustion for each component selected for identification in each distillate fraction. Overall, the distillation curves and enthalpy data for all three fluids are remarkably similar. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800988u