High-Pressure Densities and Excess Molar Volumes for the Binary Mixture of Carbon Dioxide and Hydrogen Sulfide at <i>T</i> = 343–397 K
Bibliographic record
Abstract
High Resolution Image Download MS PowerPoint Slide A few studies have been carried out on the volumetric properties of binary systems of H 2 S + CO 2, which are rich in CO 2; however, no volumetric studies for acid gas fluids rich in H 2 S have been found in the open literature. Herein we report new high-precision density measurements for three compositions ( x (CO 2 ) = 0.09822, 0.26989, and 0.49556) for the CO 2 + H 2 S binary system at T = 343–398 K and pressures up to p = 25 MPa. The measured mixture densities were compared to data from Stouffer et al. ( J. Chem. Eng. Data 2001, 46, 1309−1318. DOI: 10.1021/je000182c .) and Nazeri et al. ( Fluid Phase Equilib. 2016, 423, 156−171. DOI: 10.1016/j.fluid.2016.04.024 .The measured density data showed agreement within ca. ±2% at high pressures and up to 4% in the vicinity of the critical point or high compressibility region. Additionally, we used our mixtures and interpolated pure fluid densities to calculate the excess molar volumes, to further ascertain the accuracy of the mixing coefficients provided by Kunz and Wagner ( J. Chem. Eng. Data 2012, 57, 3032−3091. DOI: 10.1021/je300655b .). The comparison of the calculated and experimental molar volumes showed good agreement to within ±2 cm 3 ·mol –1, especially in the high-pressure region. Within the study, we considered the COS formation from the reaction of CO 2 + H 2 S, which was a potential explanation for measurement failure in previous studies. The measured equilibrium concentrations of COS were low and showed that the reaction of CO 2 + H 2 S to form COS was not facile at the measured conditions.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 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".