Kinetic Modeling Analysis of the Pyrolysis of Vinyl Bromide
Bibliographic record
Abstract
A kinetic model has been developed for the thermal decomposition of vinyl bromide at temperatures below approximately 750 K. The decomposition is initiated by two channels, a pressure dependent molecular channel, C 2 H 3 Br + M → C 2 H 2 + HBr + M, and a free radical channel, 2 C 2 H 3 Br → C 2 H 3 + C 2 H 3 Br 2 . The molecular channel is second-order overall at all the temperatures and pressures investigated. The temperature dependence of the rate constant for this reaction when vinyl bromide is M is given by ln( k 1a ) = 35.7 ± 5.4−29.8 × 10 3 (±12%)/ T . This leads to a preexponential factor of 3 × 10 15 L mol -1 s -1 and an activation energy of 248 kJ mol -1 . When M is argon, the preexponential factor is 2 × 10 8 L mol -1 s -1 and the activation energy is 153 kJ mol -1 ± 23%. The temperature dependence of the free radical decomposition step is given by ln( k 2 ) = 17.3 ± 3.2 − (17.3 × 10 3 ±13%)/ T, giving a preexponential factor of 3 × 10 7 L mol -1 s -1 and an activation energy of 144 kJ mol -1 . The model also provides kinetic data for the abstraction of hydrogen from vinyl bromide by C 2 H 3 radicals, C 2 H 3 + C 2 H 3 Br → C 2 H 4 + C 2 H 2 Br. The temperature dependence of this reaction is given by ln( k 3 ) = 28.7 ± 3.1−9.7 × 10 3 (± 22%)/ T, leading to a preexponential factor of 3 × 10 12 L mol -1 s -1 and an activation energy of 81 kJ mol -1 .
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".