𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Kinetics and modeling of the thermal reaction of propene at 800 K. Part iii. Propene in the presence of small amounts of oxygen

✍ Scribed by P. Barbé; F. Baronnet; R. Martin; D. Perrin

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
309 KB
Volume
30
Category
Article
ISSN
0538-8066

No coin nor oath required. For personal study only.

✦ Synopsis

The thermal reaction of propene was examined around in the presence of 800 K less than 20% oxygen. At initial time, the production of H 2 , CH 4 , C 2 H 4 , C 2 H 6 , allene, C 3 H 8 , 1,3butadiene, butenes, 3-and 4-methylcyclopentene, a mixture of 1,4-and 1,5-hexadienes, methylcyclopentane (or dimethylcyclobutane), 4-methylpent-1-ene, and hex-1-ene, was observed along with hydrogen peroxide, CO, and small quantities of ethanal and CO 2 . Oxygen increases the initial production of hydrogen and of most hydrocarbons and, particularly, that of C 6 dienes and of cyclenes. However, the production of allene, methylcyclopentane (or dimethylcyclobutane), and 4-methylpent-1-ene is practically not affected. A kinetic study confirms the mechanism proposed for the thermal reaction of propene. Formation of allene, thus, involves a four-center-unimolecular dehydrogenation of propene, that of 4-methylpent-1-ene is explained by an ene bimolecular reaction while methylcyclopentane (or dimethylcyclobutane) probably arises from a bimolecular process involving a biradical intermediate. Other products arise from a conventional chain radical mechanism.

A kinetic scheme is proposed in which chains are primarily initiated by the bimolecular step:

which competes with the second-order initiation of propene pyrolysis. Since allene production is not affected by oxygen, it is concluded that allyl radicals are not dehydrogenated by oxygen; but they oxidize in a branching step involving allylperoxyl radicals; r. radicals other than methyl, and allyl are dehydrogenated according to the conventional process: r• ϩ O !: unsaturated ϩ HO •

📜 SIMILAR VOLUMES

Kinetic study and modeling of the hetero
Kinetic study and modeling of the hetero-homo-geneous pyrolysis and oxidation of isobutane around 800 K. Part III. Pyrolysis-oxidation in unpacked and in pbO-coated packed Pyrex reactors
✍ R. Zils; D. Perrin; R. Martin 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 261 KB 👁 1 views

Isobutane pyrolysis has been studied in the presence of oxygen at about in 773 K unpacked and in PbO-coated packed Pyrex reactors. The reaction is shown to be accelerated by oxygen in reactors of low surface-to-volume ratio and strongly inhibited in packed PbOcoated reactors. These oxygen effects ar

Kinetic study and modeling of the hetero
Kinetic study and modeling of the hetero-homogeneous pyrolysis and oxidation of isobutane around 800 K. Part I. Pyrolysis in an unpacked pyrex reactor
✍ R. Zils; R. Martin; D. Perrin 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 234 KB 👁 1 views

Isobutane pyrolysis is studied in an unpacked Pyrex reactor at 20-100 torr initial pressures and Results are interpreted in terms of a long chain radical mechanism 750-793 K. and the reaction is modeled. The reaction selectivity or ratio of the initial production rate of isobutene (or hydrogen) to t

Partitioning of low molecular combinatio
Partitioning of low molecular combination peptides in aqueous two-phase systems of poly(ethylene glycol) and dextran in the presence of small amounts of K2HPO4/KH2PO4 buffer at 293 K: Experimental results and predictions
✍ Christoph Großmann; Ralf Tintinger; Jiandung Zhu; Gerd Maurer 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 180 KB 👁 2 views

Buffered aqueous two-phase systems are effective extraction systems for separating amphoteric hydrocarbons like, for example, polypeptides from aqueous phases. The design and basic engineering of such processes requires the knowledge of the liquid-liquid equilibrium. The study presented here aims to

Kinetic study and modeling of the hetero
Kinetic study and modeling of the hetero-homogeneous pyrolysis and oxidation of isobutane around 800 K. Part II. Pyrolysis in pyrex reactors packed with platinum foils or PbO-treated pyrex rods
✍ R. Zils; R. Martin; D. Perrin 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 231 KB 👁 1 views

Isobutane pyrolysis has been studied at initial pressures and 20-200 torr in a packed reactor treated with PbO and in a reactor packed with platinum foils. 773-793 K, These packings strongly inhibit product formation and this effect is explained by the occurrence of the heterogeneous termination ste