The very high temperature pyrolysis of ethylene and the subsequent reactions of product acetylene
| Autor: | J. H. Kiefer, S.A. Kapsalis, K. A. Budach, M. Z. Al-Alami |
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| Rok vydání: | 1983 |
| Předmět: |
Ethylene
Chemistry General Chemical Engineering Radical polymerization Analytical chemistry General Physics and Astronomy Energy Engineering and Power Technology General Chemistry Dissociation (chemistry) chemistry.chemical_compound Fuel Technology Reaction rate constant Acetylene Solid carbon Shock tube Pyrolysis |
| Zdroj: | Combustion and Flame. 51:79-93 |
| ISSN: | 0010-2180 |
| DOI: | 10.1016/0010-2180(83)90085-8 |
| Popis: | The pyrolysis of 3% C2H4Kr mixtures has been studied in a shock tube with the laser schlieren technique over 2300–3200K. Initial dissociation of C2H4 is clearly resolved over this range, and for T > 2700K, density gradients arising from further decomposition of product acetylene are evident. C2H2 decomposition is marked by a local maximum in gradient and is initiated by H-atom formed in C2H4 dissociation. Rate constants for the two C2H4 dissociation channels C 2 H 4 +M → C 2 H 2 H 2 +M k=(1.4±0.3)×10 15 exp (−27900/T)cm 3 /mols(2300−3200K) , and C 2 H 4 +M → C 2 H 3 H +M k=(1.4±0.3)×10 15 exp (−41180/T)cm 3 /mols(2300−3200K) were derived from the initial gradients and the location of the C2H2 gradient maximum. A sufficient C2H2 gradient following C2H4 dissociation requires the addition of C 2 H 2 → C 4 H 2 +H k∼3×10 13 cm3/mols , which, together with C 4 H 2 → C 4 H +H , acts to dissociate excess H2 formed in C2H4 dissociation. The calculated late gradient drops too rapidly, the result of an equilibration of the entire C2H2 mechanism. It is suggested that radical polymerization to solid carbon defeats this equilibration and a schematic mechanism for this is considered. |
| Databáze: | OpenAIRE |
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