Measurement and Modeling of Enthalpy of Solution of Carbon Dioxide in Aqueous Solutions of Diethanolamine at Temperatures of (322.5 and 372.9) K and Pressures up to 3 MPa
Bibliographic record
Abstract
The enthalpies of solution (Δ sol H ) of carbon dioxide (CO 2 ) in two aqueous solutions ( w = 0.1500 and w = 0.3000) of diethanolamine (DEA) have been measured at two temperatures ((322.5 and 372.9) K) and pressures up to 3 MPa. Measurements were carried out by a flow calorimetric technique using a custom-made flow-mixing unit combined with a SETARAM C-80 isothermal differential heat-flux calorimeter. Enthalpies of solution of CO 2 (Δ sol H ) have been obtained as function of loading, α (moles CO 2 /mol amine). Influences of temperature, pressure, and absorbent composition have been discussed. Solubility data of the gas into the different absorbent ( s ) were derived from the enthalpic data. The experimental enthalpies of solution (Δ sol H ) of carbon dioxide (CO 2 ) in the two aqueous solutions of diethanolamine have been compared with data derived from a rigorous thermodynamic model of phase equilibria based on a γ–ϕ approach. Interaction parameters were chosen to be adjustable parameters in this model and were fitted to vapor–liquid equilibrium data. Several formulations for the amine protonation and carbamate formation equilibrium constants have been tested. The different contributions to the enthalpy of solution of CO 2 in aqueous solutions of DEA have been analyzed.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 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 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".