CO<sub>2</sub>/N<sub>2</sub> Separation by Poly(Ether Block Amide) Thin Film Hollow Fiber Composite Membranes
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
Thin film poly(ether block amide) (PEBA) hollow fiber composite membranes were developed for CO 2 /N 2 separation, which is relevant to CO 2 capture from flue gas for greenhouse gas emission control. The membrane was prepared by coating a thin layer of PEBA onto microporous polyetherimide (PEI) hollow fiber substrate membranes. Lab-scale hollow fiber membrane modules were assembled and tested for CO 2 /N 2 separation with various flow configurations using a simulated flue gas (15.3% carbon dioxide, balance N 2 ) as the feed. The shell side feed with counter-current flow was shown to perform better than other configurations over a wide range of stage cuts in terms of product purity, recovery, and productivity. At 23 °C and 790 kPa, a permeate stream containing 62 mol % CO 2 was obtained at a CO 2 recovery of 20% in a single-stage operation, whereas 99.4 mol % nitrogen could be produced in the residue with a nitrogen recovery of 36%. It was found that the permeance of CO 2 in the gas mixture was lower than the permeance of pure CO 2 at the same pressure, while there was little difference in nitrogen permeance between pure gas permeation and gas mixture permeation. The PEBA/PEI thin film hollow fiber composite membrane was not suitable for bore side feed operation because of the potential problems associated with concentration polarization in the microporous substrate and the structural integrity of the membrane when a high pressure was applied in the fiber lumen.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.002 |
| 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 it