COMPLEX THERMAL INTEGRATION OF THE RECTIFICATION PROCESS OF THE BENZENE-TOLUENE MIXTURE
Bibliographic record
Abstract
Comprehensive thermal integration of the benzene-toluene mixture rectification process was carried out. Thermal integration was carried out using pinch analysis methods with using thermocompression. The principle technological scheme of rectification of the benzene-toluene mixture with a productivity of 11 t/h is taken as a basis. For this performance, the consumption of flows, their temperatures, heat load, and flow heat capacities are calculated on the basis of the material and heat balance. Based on the calculated data, a flow table was created. Three hot streams are selected for integration: the distillate, the tailings, and the vapor from the top of the column, and two cold streams: the initial mixture and the column cube. The necessary degree of vapor compression is calculated for thermocompression. For a given degree of compression, the temperature of the steam after compression and the temperature of its condensation were calculated. Based on the technical and economic considerations, the minimum temperature difference DTmin=12 °С was determined for this technological scheme of the rectification process. For the selected DTmin, the component curves of the flows are constructed. Using the table algorithm method, the temperatures of the furnace for hot and cold flows were determined, which are ТНpinh=82 °С, ТСpinh=70 °С. The minimum number of hot and cold utilities is determined: QНmin and QCmin. For the selected DTmin, heat recovery was obtained in the amount of Qrek=2186,82 kW. A grid diagram is constructed, heat exchangers are located in accordance with CP and N rules. A technological scheme of the rectification process after reconstruction using thermocompression is proposed. The upgraded scheme includes the use of four recuperative heat exchangers, one heater and two coolers to achieve target flow temperatures. It is recommended to install a compressor for thermocompression. The use of Alfa Laval plate heat exchangers is proposed as heat exchange equipment. The payback period of the proposed solution is approximately two to two and a half years.
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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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| 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".