Comprehensive Study of the Kinetics of the Oxidative Degradation of CO<sub>2</sub> Loaded and Concentrated Aqueous Monoethanolamine (MEA) with and without Sodium Metavanadate during CO<sub>2</sub> Absorption from Flue Gases
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Bibliographic record
Abstract
A comprehensive mechanistic-based kinetic study of the oxidative degradation of CO 2 loaded MEA, with and without a corrosion inhibitor (NaVO 3 ), was performed in a stainless steel rotary-type autoclave with MEA concentrations of 11.4 and 17.9 mol %, NaVO 3 concentration of 0.1 mol %, O 2 pressures of 250 and 350 kPa, and CO 2 loading ranging from 0 to 0.44 (mol of CO 2 )/(mol of MEA) at temperatures of 328−393 K (typical absorber and stripper temperatures). The results showed that the presence of NaVO 3 and increases in MEA concentration, temperature, or O 2 pressure resulted in an increase in the MEA degradation rate. In contrast, an increase in CO 2 loading led to a decrease in the degradation rate. The general mechanistic rate model obtained to represent all the systems investigated was of the following form: − r MEA = { k 1 1 [MEA] a [O 2 ] b }/{ k 2 + k 3 [O 2 ] c + k 5 [CO 2 ] e }. This rate model shows that, in a CO 2 loaded system, the loaded CO 2 acts as a degradation inhibitor. In addition, the order of reaction with respect to MEA ( a ) for all the systems investigated was ∼1.
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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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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