H−L<sub>W</sub>−V Equilibrium Measurements for the CH<sub>4</sub> + C<sub>2</sub>H<sub>6</sub> + H<sub>2</sub>O Hydrate Forming System
Bibliographic record
Abstract
Three-phase equilibrium conditions for the CH 4 (1) + C 2 H 6 (2) + H 2 O (3) system in H−L W −V equilibrium were determined to ascertain the effects of pressure, temperature, and gas-phase composition in the temperature region above the freezing point of water as well as to construct a 3D phase diagram. The obtained equilibrium temperature, pressure, and gas-phase compositions were in the range of (275 to 281) K, (0.7 to 2.7) MPa, and y 1 = (0.30 to 0.85), respectively. Along any given isotherm and isobar, the equilibrium pressure increased and the equilibrium temperature decreased, respectively, with increasing mole fraction of methane in the gas phase for both structure I and structure II hydrates. At constant gas-phase compositions, the system followed the exponential trend seen for pure gases, with equilibrium pressures close to that of simple ethane hydrates even at high concentrations of methane in the system. A 3D representation of the phase diagram was constructed of the system. The diagram consists of two planes due to the presence of both structure I and structure II. The structure change is seen by the intersection of the two planes, and there is no significant discontinuity in the phase plane diagram.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 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) | 0.002 | 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".