La Pyrolyse Du Propane Et De L'isopentane: Influence De Traces d'OXYGÈNE Et Effets De Parois

Niclause, Michel; Martin, René; Combes, A.; Dzierzynski, M.

doi:10.1139/v65-149

Cited by 12 publications

(9 citation statements)

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“…The olefins (propylene and ethylene) and water also increased with increase in initial oxygen concentration as indicated in Figure 5 and 6, respectively. These observations are in agreement with the works of Niclause (1965), Blakemore (1973), and Taylor (1976.…”

Section: (12)supporting

confidence: 93%

“…C3H7 ---* CZH, + CHB (8) Reactions 4 and 5 would then constitute the period of decreased rate while reactions 6 and 7 constitute the period of increased rate (Niclause, 1965;Taylor et al, 1976). According to Taylor and Kulich (19761, reaction 4 may be a reaction "type" represented by the following steps…”

Section: Mechanism and Modelmentioning

confidence: 99%

“…Recent studies by Layokun and Slater have shown the effect of certain chemical impurities on the kinetics and product distribution from propane pyrolysis in a plug flow quartz reactor at 1 atm pressure and temperatures between 600 and 750 "C. The influence of trace amounts of oxygen on the product distribution has also been the subject of investigation by many researchers (Niclause et al, 1965;Knox, 1960;Blakemore, 1973;Martin et al, 1976). Most of these studies, however, were conducted at temperatures below those encountered in commercial pyrolyses.…”

Section: Introductionmentioning

confidence: 99%

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Oxidative Pyrolysis of Propane

Layokun¹

1979

Ind. Eng. Chem. Proc. Des. Dev.

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Literature on the oxidative pyrolysis of propane is very sparse for temperatures above 600 OC. Hence the present work was carried out between 600 and 700 OC at 1 atm total pressure using a plug flow quartz reactor and the MS10-C2 mass spectrometer as the analytical tool. Small amounts of oxygen were added into the propane stream such that the oxygen can only participate in the early stages of reaction, thus throwing some light on the nature of the initiation reactions in pyrolysis and oxidation systems. Results were compared with computer predictions. The following observations were made: (1) a faster rate of decomposition of propane in the presence of oxygen than in its absence; (2) a product distribution (at the initial stages) in order of magnitude C3H8, C2H4, CH,, H, , and C2Hs as compared to the order CH, , C2H4, C3H6, H, , and C2H6 in the absence of oxygen; (3) the mechanism reported in the literature for temperatures between 500 and 600 "C is also operative at higher temperatures; (4) a 28 reaction step model fits the experimental data. The role of H 0 2 in relation to the observed product spectrum is also fully discussed

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Section: (12)supporting

confidence: 93%

Section: Mechanism and Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oxidative Pyrolysis of Propane

Layokun¹

1979

Ind. Eng. Chem. Proc. Des. Dev.

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“…The gold cells were then loaded and heated under pressure in stainless steel autoclaves. Special care was taken to avoid oxygen concentration in the gold cells because oxygen speeds up the reactivity [27][28][29].…”

Section: Confined Pyrolysismentioning

confidence: 99%

Experimental study of interactions between uranium and n-alkanes in hydrothermal conditions (500 bar, 200 °C)

Salze

Belcourt

Lannuzel

2019

Journal of Analytical and Applied Pyrolysis

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Organic matter is commonly involved in uranium deposits by reducing and alteration processes. An experimental study of the pyrolysis of linear n-alkanes at 200°C, 500 bar for 2 months in presence of water and/or uranium were carried out. These experiments reveal that the initiation mechanism of the reaction pathway is the reduction of uranium and the oxidation of organic matter and that the oxidation of n-alkanes produces different compounds (aldehydes, alcohols, ketones, carboxylic acids, esters) in different configurations and proportions by auto-oxidation and free-radical reactions. Another parameter observed during the experiments is the increase of the oxidation process the longer the aliphatic chain is. The pyrolysis of n-octane particularly revealed the role of water as an oxidizing agent instead of auto-oxidation mechanisms.

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“…This is in sharp contrast to ethane (3) and propane (19) interaction is limited to the equilibrium step and *Co.nditions: point sampling technique, 0.4Z O2 added to the N Z the biradical diffuses from its adsorbed site, when ~nd~cated. 643 "C reaction temperature, S / V = 1.2cm-1.…”

Section: Figmentioning

confidence: 99%

Homogeneous Gas-phase Pyrolyses using a Wall-less Reactor. IV. Comparative Surface-Nonsurface Effects with Cyclopropane

Kulich¹,

Taylor²,

Hutchings³

1974

Can. J. Chem.

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The rates of pyrolysis of cyclopropane in nitrogen have been determined using a wall-less reactor at temperatures of 600-740 "C and a total pressure of 1 atm. In the presence of oxidized stainless steel. quartz, o r carbon coated steel rods the rate of conversion to propylene is 1.9 times the rate under homogeneous conditions. A maximum in surface effect was observed at S / V = 0.6 a n -' . A small but increased amount of methane and ethene are formed under surface conditions as compared to homogeneous conditions. Several possible mechanisms for the rate enhancement by surface are discussed. The most likely possibility is surface interaction with the cyclopropane molecule to form the diradical followed by its surface promoted conversion to propene. The importance of determining surface effects by comparing surface rates with totally homogeneous rates is emphasized.On a evalue les differentes vitesses de pyrolyse dans I'azote du cyclopropane en utilisant un reacteur sans paroi a des temperatures de 600 a 740 "C et a une pression totale d'un atmosphere. En presence de tiges d'acier recouvertes de quartz, de carbone ou d'acier inoxydable oxyde, la vitesse de transformation en propylene est superieure par un facteur de 1.9 a celle enregistree dans des conditions hornogenes. On a observe a S / V = 0.6 cm-' un effet de surface maximum. D e m&me, uneltgtre augmentation d e la quantite produite de methane et d'ethane a Ctt enregistree dans les conditions impliquant une surface par rapport aux conditions homogenes. On discute de plusieurs mecanismes probables tenant compte de I'augmentation de vitesse due a une interaction surface-cyclopropane conduisant i u n biradical puis a s a transformation, favorisee par la surface, en propene. On discute aussi de I'importance d'evaluer les effets de surface par comparaison entre les vitesses observtes lors de la presence d'une surface et celles obtenues dans des conditions parfaitement homogenes.[Traduit p a r le journal]Can.

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La Pyrolyse Du Propane Et De L'isopentane: Influence De Traces d'OXYGÈNE Et Effets De Parois

Cited by 12 publications

References 0 publications

Oxidative Pyrolysis of Propane

Oxidative Pyrolysis of Propane

Experimental study of interactions between uranium and n-alkanes in hydrothermal conditions (500 bar, 200 °C)

Homogeneous Gas-phase Pyrolyses using a Wall-less Reactor. IV. Comparative Surface-Nonsurface Effects with Cyclopropane

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