Heats of Absorption of CO<sub>2</sub> in Aqueous Solutions of Tertiary Amines: <i>N</i>-Methyldiethanolamine, 3-Dimethylamino-1-propanol, and 1-Dimethylamino-2-propanol
Bibliographic record
Abstract
The heats of absorption of CO 2 in aqueous tertiary amines ( N -methyldiethanolamine (MDEA), 3-dimethylamino-1-propanol (3DMAP), and 1-dimethylamino-2-propanol (1DMAP)) were measured using a flow calorimeter at different temperatures (298.15, 313.15, and 343.15 K) and pressures (2 and 5 MPa) for 5 and 30 wt %. The integral heat of absorption and the indirect solubility limit were determined using the experimental data. The heat of absorption values were correlated using a rigorous thermodynamic model. The temperature dependent heats of reactions and the equilibrium constants for amine protonation reactions were calculated using the model. Comparisons were made with the integral heat of absorption values obtained from phase equilibrium measurements for MDEA using the Gibbs–Helmholtz equation. 3DMAP was found to have a higher CO 2 loading capacity (mol CO 2 /mol amine ) and a higher reaction rate with a similar heat of absorption when compared to other popular tertiary amines (MDEA and triethanolamine (TEA)).
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| 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 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 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 source (direct Gemma or distilled Codex), 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".