Experimental and Modeling Study of Trends in the High-Temperature Ignition of Methyl and Ethyl Esters
Why this work is in the frame
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Bibliographic record
Abstract
Methyl and ethyl esters of carboxylic acids can be obtained from the trans-esterification of fatty acid triglycerides using methanol and ethanol, respectively. In this work, the relative ignition of methyl and ethyl esters is reported, based on new high-temperature shock tube ignition data of ethyl acetate (EA) and ethyl propanoate (EP). These are compared with literature data for other methyl and ethyl esters, and isomer and alkyl group effects are also investigated. It is found that ethyl esters are generally characterized by shorter ignition delay times than those of methyl esters of the corresponding alkanoic acid. Increased reactivity of ethyl esters is also observed for isomeric ethyl and methyl esters. A combined high-temperature chemical kinetic model is proposed for methyl and ethyl acetates as well as for ethyl formate in order to shed light on the link between chemical structure and the observed reactivity trends. The proposed model reflects the experimental trends and generally predicts ignition delay times in close agreement with measured data. The reduced methyl acetate reactivity is attributed both to the absence of more reactive secondary C–H sites and the ethyl group which facilitates complex unimolecular decomposition reactions in ethyl esters such as acid and ethylene elimination. The model and the new experimental data contribute toward improved understanding and modeling of the combustion properties of biodiesel surrogates.
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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 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 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 it