Phase Behavior of Athabasca Vacuum Bottoms + n-Alkane Mixtures
Why this work is in the frame
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Bibliographic record
Abstract
Summary The phase behavior of Athabasca vacuum bottoms (ABVB), a 798.15+K (525+°C) boiling fraction comprising 32 wt% pentane asphaltenes +pentane mixtures, is elucidated using x-ray transmission tomography. These pseudobinary mixtures are models for the development of novel heavy-oil/bitumen production and refining processes. Depending on their overall composition, these mixtures are shown to exhibit three- and four-phase equilibria, including both expected (L1L2V) and unexpected (L2L3V) phase behavior separated by a small L1L2L3V zone. These multiphase equilibria provide challenges in production environments, where miscible flooding is typically desired, but afford new opportunities for the development of separation technologies in refining. Example phase diagrams are presented (pressure-temperature at constant composition and pressure-composition at constant temperature), which focus on the bubble pressure region where multiphase regions arise. Limited phase equilibria data sets for ABVB+heptane, decane, and dodecane are also presented so that trends for ABVB+alkane mixtures with the size of the alkane diluent can be explored. It is expected that these phase diagrams will provide useful insights to heavy-oil producers and refiners, in addition to providing a benchmark for testing phase-behavior models for these and related complex hydrocarbon mixtures.
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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) | 0.000 | 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) | 0.001 | 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