Experimental Studies on the Syntheses of Mesityl Oxide and Methyl Isobutyl Ketone via Catalytic Distillation
Bibliographic record
Abstract
Two pilot-scale experiments were conducted to investigate the syntheses of mesityl oxide (MO) and methyl isobutyl ketone (MIBK) from acetone using catalytic distillation (CD) technology. Commercial catalysts were utilized to obtain process benchmarks and to gain a cursory assessment of these processes. In the first CD experiment, MO was produced from acetone using Amberlyst-15 as a catalyst. The MO production and the product distribution were found to be governed by the reflux flow rate in the CD column. A process interaction is evident whereby the magnitude of the effect of the reboiler duty on the reflux flow rate is dependent on the system pressure. Significantly, the results of the first experiment clearly show that, by using CD technology, undesirable consecutive reactions can be minimized while the production of a desired intermediate species is simultaneously increased. In this case, the MO production was increased while the production of phorone, isophorone, mesitlyene, and other higher-molecular-weight products was simultaneously minimized by increasing the reflux flow rate in the CD reactor. Our first attempt to synthesize MIBK from acetone in a single stage in a CD reactor operating in continuous mode with two separate reaction zones was successful. However, the MIBK yield was relatively low, primarily because of hydrogenation catalyst deactivation and exacerbated by the relatively low system pressures used in the hydrogenation experiments, which ranged from 0.4 to 0.6 MPa. Although the mechanism of deactivation is unclear, experimental evidence suggests that MIBK is strongly adsorbed on the Pd/Al 2 O 3 catalyst and might have contributed to catalyst deactivation.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| 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 | 0.001 |
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".