Phase Equilibrium Conditions and Crystal Structure of Binary Hydrates Formed with 1-Methylpiperidine
Bibliographic record
Abstract
The measurements of thermophysical and crystalline properties were conducted to propose the use of binary structure H (sH) hydrates of 1-methylpiperidine for carbon capture and storage (CCS). 1-Methylpiperidine is one of the most effective large guest compounds to relax the phase equilibrium conditions of binary sH clathrate hydrates. To reduce energy consumption in hydrate-based CCS, the hydrates should be formed as close to room temperature and ambient atmospheric pressure as possible. Phase equilibrium conditions of hydrates formed in the N 2 + 1-methylpiperidine + water, CO 2 + 1-methylpiperidine + water, and N 2 + CO 2 + 1-methylpiperidine + water systems were measured. Powder X-ray diffraction and gas composition analyses were also conducted. In the N 2 + 1-methylpiperidine + water system, the binary structure H hydrate was formed under milder phase equilibrium conditions with higher temperature and lower pressure values, as compared to those of N 2 + neohexane hydrate and pure N 2 hydrate. In the CO 2 + 1-methylpiperidine + water and N 2 + CO 2 + 1-methylpiperidine + water systems, structure I (sI) hydrates were formed. This is attributed to the chemical reaction between CO 2, 1-methylpiperidine, and water in these systems, which prevents the sH hydrate formation. The composition of N 2 + CO 2 gas encapsulated into the binary sI hydrate was N 2:CO 2 = 0.20:0.80. CO 2 capture was successful with the sI hydrate.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.000 | 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 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".